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/*
 SPDX-License-Identifier: MIT
*/

pragma solidity ^0.7.6;
pragma experimental ABIEncoderV2;

import "../../C.sol";
import "../../tokens/Fertilizer/Fertilizer.sol";

/**
 * @author deadmanwalking
 * @title InitBipMiscImprovements updates the Fertilizer implementation
 * to use a decentralized uri
**/

contract InitBipMiscImprovements {

    function init() external {
        
        // deploy new Fertilizer implementation
        Fertilizer fertilizer = new Fertilizer();
        // get the address of the new Fertilizer implementation
        address fertilizerImplementation = address(fertilizer);
        
        // upgrade to new Fertilizer implementation
        C.fertilizerAdmin().upgrade(
            C.fertilizerAddress(),
            fertilizerImplementation
        );
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/Initializable.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC165Upgradeable.sol";
import "../proxy/Initializable.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165Upgradeable is Initializable, IERC165Upgradeable {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    function __ERC165_init() internal initializer {
        __ERC165_init_unchained();
    }

    function __ERC165_init_unchained() internal initializer {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165Upgradeable {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMathUpgradeable {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity >=0.4.24 <0.8.0;

import "../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {

    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC1155Upgradeable.sol";
import "./IERC1155MetadataURIUpgradeable.sol";
import "./IERC1155ReceiverUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../introspection/ERC165Upgradeable.sol";
import "../../math/SafeMathUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../proxy/Initializable.sol";

/**
 *
 * @dev Implementation of the basic standard multi-token.
 * See https://eips.ethereum.org/EIPS/eip-1155
 * Originally based on code by Enjin: https://github.com/enjin/erc-1155
 *
 * _Available since v3.1._
 */
contract ERC1155Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC1155Upgradeable, IERC1155MetadataURIUpgradeable {
    using SafeMathUpgradeable for uint256;
    using AddressUpgradeable for address;

    // Mapping from token ID to account balances
    mapping (uint256 => mapping(address => uint256)) private _balances;

    // Mapping from account to operator approvals
    mapping (address => mapping(address => bool)) private _operatorApprovals;

    // Used as the URI for all token types by relying on ID substitution, e.g. https://token-cdn-domain/{id}.json
    string private _uri;

    /*
     *     bytes4(keccak256('balanceOf(address,uint256)')) == 0x00fdd58e
     *     bytes4(keccak256('balanceOfBatch(address[],uint256[])')) == 0x4e1273f4
     *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
     *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256,uint256,bytes)')) == 0xf242432a
     *     bytes4(keccak256('safeBatchTransferFrom(address,address,uint256[],uint256[],bytes)')) == 0x2eb2c2d6
     *
     *     => 0x00fdd58e ^ 0x4e1273f4 ^ 0xa22cb465 ^
     *        0xe985e9c5 ^ 0xf242432a ^ 0x2eb2c2d6 == 0xd9b67a26
     */
    bytes4 private constant _INTERFACE_ID_ERC1155 = 0xd9b67a26;

    /*
     *     bytes4(keccak256('uri(uint256)')) == 0x0e89341c
     */
    bytes4 private constant _INTERFACE_ID_ERC1155_METADATA_URI = 0x0e89341c;

    /**
     * @dev See {_setURI}.
     */
    function __ERC1155_init(string memory uri_) internal initializer {
        __Context_init_unchained();
        __ERC165_init_unchained();
        __ERC1155_init_unchained(uri_);
    }

    function __ERC1155_init_unchained(string memory uri_) internal initializer {
        _setURI(uri_);

        // register the supported interfaces to conform to ERC1155 via ERC165
        _registerInterface(_INTERFACE_ID_ERC1155);

        // register the supported interfaces to conform to ERC1155MetadataURI via ERC165
        _registerInterface(_INTERFACE_ID_ERC1155_METADATA_URI);
    }

    /**
     * @dev See {IERC1155MetadataURI-uri}.
     *
     * This implementation returns the same URI for *all* token types. It relies
     * on the token type ID substitution mechanism
     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
     *
     * Clients calling this function must replace the `\{id\}` substring with the
     * actual token type ID.
     */
    function uri(uint256) external view virtual override returns (string memory) {
        return _uri;
    }

    /**
     * @dev See {IERC1155-balanceOf}.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) public view virtual override returns (uint256) {
        require(account != address(0), "ERC1155: balance query for the zero address");
        return _balances[id][account];
    }

    /**
     * @dev See {IERC1155-balanceOfBatch}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(
        address[] memory accounts,
        uint256[] memory ids
    )
        public
        view
        virtual
        override
        returns (uint256[] memory)
    {
        require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch");

        uint256[] memory batchBalances = new uint256[](accounts.length);

        for (uint256 i = 0; i < accounts.length; ++i) {
            batchBalances[i] = balanceOf(accounts[i], ids[i]);
        }

        return batchBalances;
    }

    /**
     * @dev See {IERC1155-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(_msgSender() != operator, "ERC1155: setting approval status for self");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC1155-isApprovedForAll}.
     */
    function isApprovedForAll(address account, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[account][operator];
    }

    /**
     * @dev See {IERC1155-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    )
        public
        virtual
        override
    {
        require(to != address(0), "ERC1155: transfer to the zero address");
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: caller is not owner nor approved"
        );

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, to, _asSingletonArray(id), _asSingletonArray(amount), data);

        _balances[id][from] = _balances[id][from].sub(amount, "ERC1155: insufficient balance for transfer");
        _balances[id][to] = _balances[id][to].add(amount);

        emit TransferSingle(operator, from, to, id, amount);

        _doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data);
    }

    /**
     * @dev See {IERC1155-safeBatchTransferFrom}.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    )
        public
        virtual
        override
    {
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
        require(to != address(0), "ERC1155: transfer to the zero address");
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: transfer caller is not owner nor approved"
        );

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, to, ids, amounts, data);

        for (uint256 i = 0; i < ids.length; ++i) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            _balances[id][from] = _balances[id][from].sub(
                amount,
                "ERC1155: insufficient balance for transfer"
            );
            _balances[id][to] = _balances[id][to].add(amount);
        }

        emit TransferBatch(operator, from, to, ids, amounts);

        _doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data);
    }

    /**
     * @dev Sets a new URI for all token types, by relying on the token type ID
     * substitution mechanism
     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
     *
     * By this mechanism, any occurrence of the `\{id\}` substring in either the
     * URI or any of the amounts in the JSON file at said URI will be replaced by
     * clients with the token type ID.
     *
     * For example, the `https://token-cdn-domain/\{id\}.json` URI would be
     * interpreted by clients as
     * `https://token-cdn-domain/000000000000000000000000000000000000000000000000000000000004cce0.json`
     * for token type ID 0x4cce0.
     *
     * See {uri}.
     *
     * Because these URIs cannot be meaningfully represented by the {URI} event,
     * this function emits no events.
     */
    function _setURI(string memory newuri) internal virtual {
        _uri = newuri;
    }

    /**
     * @dev Creates `amount` tokens of token type `id`, and assigns them to `account`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - If `account` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _mint(address account, uint256 id, uint256 amount, bytes memory data) internal virtual {
        require(account != address(0), "ERC1155: mint to the zero address");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, address(0), account, _asSingletonArray(id), _asSingletonArray(amount), data);

        _balances[id][account] = _balances[id][account].add(amount);
        emit TransferSingle(operator, address(0), account, id, amount);

        _doSafeTransferAcceptanceCheck(operator, address(0), account, id, amount, data);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_mint}.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function _mintBatch(address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data) internal virtual {
        require(to != address(0), "ERC1155: mint to the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);

        for (uint i = 0; i < ids.length; i++) {
            _balances[ids[i]][to] = amounts[i].add(_balances[ids[i]][to]);
        }

        emit TransferBatch(operator, address(0), to, ids, amounts);

        _doSafeBatchTransferAcceptanceCheck(operator, address(0), to, ids, amounts, data);
    }

    /**
     * @dev Destroys `amount` tokens of token type `id` from `account`
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens of token type `id`.
     */
    function _burn(address account, uint256 id, uint256 amount) internal virtual {
        require(account != address(0), "ERC1155: burn from the zero address");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, account, address(0), _asSingletonArray(id), _asSingletonArray(amount), "");

        _balances[id][account] = _balances[id][account].sub(
            amount,
            "ERC1155: burn amount exceeds balance"
        );

        emit TransferSingle(operator, account, address(0), id, amount);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_burn}.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     */
    function _burnBatch(address account, uint256[] memory ids, uint256[] memory amounts) internal virtual {
        require(account != address(0), "ERC1155: burn from the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, account, address(0), ids, amounts, "");

        for (uint i = 0; i < ids.length; i++) {
            _balances[ids[i]][account] = _balances[ids[i]][account].sub(
                amounts[i],
                "ERC1155: burn amount exceeds balance"
            );
        }

        emit TransferBatch(operator, account, address(0), ids, amounts);
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning, as well as batched variants.
     *
     * The same hook is called on both single and batched variants. For single
     * transfers, the length of the `id` and `amount` arrays will be 1.
     *
     * Calling conditions (for each `id` and `amount` pair):
     *
     * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * of token type `id` will be  transferred to `to`.
     * - When `from` is zero, `amount` tokens of token type `id` will be minted
     * for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`
     * will be burned.
     * - `from` and `to` are never both zero.
     * - `ids` and `amounts` have the same, non-zero length.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    )
        internal
        virtual
    { }

    function _doSafeTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    )
        private
    {
        if (to.isContract()) {
            try IERC1155ReceiverUpgradeable(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) {
                if (response != IERC1155ReceiverUpgradeable(to).onERC1155Received.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non ERC1155Receiver implementer");
            }
        }
    }

    function _doSafeBatchTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    )
        private
    {
        if (to.isContract()) {
            try IERC1155ReceiverUpgradeable(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (bytes4 response) {
                if (response != IERC1155ReceiverUpgradeable(to).onERC1155BatchReceived.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non ERC1155Receiver implementer");
            }
        }
    }

    function _asSingletonArray(uint256 element) private pure returns (uint256[] memory) {
        uint256[] memory array = new uint256[](1);
        array[0] = element;

        return array;
    }
    uint256[47] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

import "./IERC1155Upgradeable.sol";

/**
 * @dev Interface of the optional ERC1155MetadataExtension interface, as defined
 * in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155MetadataURIUpgradeable is IERC1155Upgradeable {
    /**
     * @dev Returns the URI for token type `id`.
     *
     * If the `\{id\}` substring is present in the URI, it must be replaced by
     * clients with the actual token type ID.
     */
    function uri(uint256 id) external view returns (string memory);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../introspection/IERC165Upgradeable.sol";

/**
 * _Available since v3.1._
 */
interface IERC1155ReceiverUpgradeable is IERC165Upgradeable {

    /**
        @dev Handles the receipt of a single ERC1155 token type. This function is
        called at the end of a `safeTransferFrom` after the balance has been updated.
        To accept the transfer, this must return
        `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
        (i.e. 0xf23a6e61, or its own function selector).
        @param operator The address which initiated the transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param id The ID of the token being transferred
        @param value The amount of tokens being transferred
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
    */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    )
        external
        returns(bytes4);

    /**
        @dev Handles the receipt of a multiple ERC1155 token types. This function
        is called at the end of a `safeBatchTransferFrom` after the balances have
        been updated. To accept the transfer(s), this must return
        `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
        (i.e. 0xbc197c81, or its own function selector).
        @param operator The address which initiated the batch transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param ids An array containing ids of each token being transferred (order and length must match values array)
        @param values An array containing amounts of each token being transferred (order and length must match ids array)
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
    */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    )
        external
        returns(bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

import "../../introspection/IERC165Upgradeable.sol";

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(address indexed operator, address indexed from, address indexed to, uint256[] ids, uint256[] values);

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids) external view returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(address from, address to, uint256 id, uint256 amount, bytes calldata data) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(address from, address to, uint256[] calldata ids, uint256[] calldata amounts, bytes calldata data) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20Upgradeable.sol";
import "../../math/SafeMathUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using SafeMathUpgradeable for uint256;
    using AddressUpgradeable for address;

    function safeTransfer(IERC20Upgradeable token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20Upgradeable token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20Upgradeable token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;
import "../proxy/Initializable.sol";

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {
    }
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;
import "../proxy/Initializable.sol";

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuardUpgradeable is Initializable {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    function __ReentrancyGuard_init() internal initializer {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal initializer {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    /**
     * @dev Converts a `uint256` to its ASCII `string` representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = bytes1(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity =0.7.6;
pragma experimental ABIEncoderV2;

import "./interfaces/IBean.sol";
import "./interfaces/ICurve.sol";
import "./interfaces/IFertilizer.sol";
import "./interfaces/IProxyAdmin.sol";
import "./libraries/Decimal.sol";

/**
 * @title C
 * @author Publius
 * @notice Contains constants used throughout Beanstalk.
 */
library C {
    using Decimal for Decimal.D256;
    using SafeMath for uint256;

    //////////////////// Globals ////////////////////

    uint256 internal constant PRECISION = 1e18;
    uint256 private constant CHAIN_ID = 1;
    bytes constant BYTES_ZERO = new bytes(0);

    /// @dev The block time for the chain in seconds.
    uint256 internal constant BLOCK_LENGTH_SECONDS = 12;

    //////////////////// Season ////////////////////

    /// @dev The length of a Season meaured in seconds.
    uint256 private constant CURRENT_SEASON_PERIOD = 3600; // 1 hour
    uint256 internal constant SOP_PRECISION = 1e24;

    //////////////////// Silo ////////////////////

    uint256 internal constant SEEDS_PER_BEAN = 2;
    uint256 internal constant STALK_PER_BEAN = 10000;
    uint256 private constant ROOTS_BASE = 1e12;

    //////////////////// Exploit Migration ////////////////////

    uint256 private constant UNRIPE_LP_PER_DOLLAR = 1884592; // 145_113_507_403_282 / 77_000_000
    uint256 private constant ADD_LP_RATIO = 866616;
    uint256 private constant INITIAL_HAIRCUT = 185564685220298701;

    //////////////////// Contracts ////////////////////

    address internal constant BEAN = 0xBEA0000029AD1c77D3d5D23Ba2D8893dB9d1Efab;
    address internal constant CURVE_BEAN_METAPOOL = 0xc9C32cd16Bf7eFB85Ff14e0c8603cc90F6F2eE49;

    address internal constant UNRIPE_BEAN = 0x1BEA0050E63e05FBb5D8BA2f10cf5800B6224449;
    address internal constant UNRIPE_LP = 0x1BEA3CcD22F4EBd3d37d731BA31Eeca95713716D;

    address private constant CURVE_3_POOL = 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7;
    address private constant THREE_CRV = 0x6c3F90f043a72FA612cbac8115EE7e52BDe6E490;

    address private constant FERTILIZER = 0x402c84De2Ce49aF88f5e2eF3710ff89bFED36cB6;
    address private constant FERTILIZER_ADMIN = 0xfECB01359263C12Aa9eD838F878A596F0064aa6e;

    address private constant TRI_CRYPTO = 0xc4AD29ba4B3c580e6D59105FFf484999997675Ff;
    address private constant TRI_CRYPTO_POOL = 0xD51a44d3FaE010294C616388b506AcdA1bfAAE46;
    address private constant CURVE_ZAP = 0xA79828DF1850E8a3A3064576f380D90aECDD3359;

    address private constant UNRIPE_CURVE_BEAN_LUSD_POOL = 0xD652c40fBb3f06d6B58Cb9aa9CFF063eE63d465D;
    address private constant UNRIPE_CURVE_BEAN_METAPOOL = 0x3a70DfA7d2262988064A2D051dd47521E43c9BdD;

    address internal constant USDC = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48;
    address internal constant USDT = 0xdAC17F958D2ee523a2206206994597C13D831ec7;
    address internal constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address internal constant WSTETH = 0x7f39C581F595B53c5cb19bD0b3f8dA6c935E2Ca0;

    // Use external contract for block.basefee as to avoid upgrading existing contracts to solidity v8
    address private constant BASE_FEE_CONTRACT = 0x84292919cB64b590C0131550483707E43Ef223aC;

    //////////////////// Well ////////////////////

    uint256 internal constant WELL_MINIMUM_BEAN_BALANCE = 1000_000_000; // 1,000 Beans
    address internal constant BEAN_ETH_WELL = 0xBEA0e11282e2bB5893bEcE110cF199501e872bAd;
    address internal constant BEAN_WSTETH_WELL = 0xBeA0000113B0d182f4064C86B71c315389E4715D;
    // The index of the Bean and Weth token addresses in all BEAN/ETH Wells.
    uint256 internal constant BEAN_INDEX = 0;
    uint256 internal constant ETH_INDEX = 1;

    function getSeasonPeriod() internal pure returns (uint256) {
        return CURRENT_SEASON_PERIOD;
    }

    function getBlockLengthSeconds() internal pure returns (uint256) {
        return BLOCK_LENGTH_SECONDS;
    }

    function getChainId() internal pure returns (uint256) {
        return CHAIN_ID;
    }

    function getSeedsPerBean() internal pure returns (uint256) {
        return SEEDS_PER_BEAN;
    }

    function getStalkPerBean() internal pure returns (uint256) {
      return STALK_PER_BEAN;
    }

    function getRootsBase() internal pure returns (uint256) {
        return ROOTS_BASE;
    }

    /**
     * @dev The pre-exploit BEAN:3CRV Curve metapool address.
     */
    function unripeLPPool1() internal pure returns (address) {
        return UNRIPE_CURVE_BEAN_METAPOOL;
    }

    /**
     * @dev The pre-exploit BEAN:LUSD Curve plain pool address.
     */
    function unripeLPPool2() internal pure returns (address) {
        return UNRIPE_CURVE_BEAN_LUSD_POOL;
    }

    function unripeBean() internal pure returns (IERC20) {
        return IERC20(UNRIPE_BEAN);
    }

    function unripeLP() internal pure returns (IERC20) {
        return IERC20(UNRIPE_LP);
    }

    function bean() internal pure returns (IBean) {
        return IBean(BEAN);
    }

    function usdc() internal pure returns (IERC20) {
        return IERC20(USDC);
    }

    function curveMetapool() internal pure returns (ICurvePool) {
        return ICurvePool(CURVE_BEAN_METAPOOL);
    }

    function curve3Pool() internal pure returns (I3Curve) {
        return I3Curve(CURVE_3_POOL);
    }
    
    function curveZap() internal pure returns (ICurveZap) {
        return ICurveZap(CURVE_ZAP);
    }

    function curveZapAddress() internal pure returns (address) {
        return CURVE_ZAP;
    }

    function curve3PoolAddress() internal pure returns (address) {
        return CURVE_3_POOL;
    }

    function threeCrv() internal pure returns (IERC20) {
        return IERC20(THREE_CRV);
    }

    function fertilizer() internal pure returns (IFertilizer) {
        return IFertilizer(FERTILIZER);
    }

    function fertilizerAddress() internal pure returns (address) {
        return FERTILIZER;
    }

    function fertilizerAdmin() internal pure returns (IProxyAdmin) {
        return IProxyAdmin(FERTILIZER_ADMIN);
    }

    function triCryptoPoolAddress() internal pure returns (address) {
        return TRI_CRYPTO_POOL;
    }

    function triCrypto() internal pure returns (IERC20) {
        return IERC20(TRI_CRYPTO);
    }

    function unripeLPPerDollar() internal pure returns (uint256) {
        return UNRIPE_LP_PER_DOLLAR;
    }

    function dollarPerUnripeLP() internal pure returns (uint256) {
        return 1e12/UNRIPE_LP_PER_DOLLAR;
    }

    function exploitAddLPRatio() internal pure returns (uint256) {
        return ADD_LP_RATIO;
    }

    function precision() internal pure returns (uint256) {
        return PRECISION;
    }

    function initialRecap() internal pure returns (uint256) {
        return INITIAL_HAIRCUT;
    }

}

// SPDX-License-Identifier: MIT

pragma solidity =0.7.6;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/**
 * @title IBean
 * @author Publius
 * @notice Bean Interface
 */
abstract contract IBean is IERC20 {
    function burn(uint256 amount) public virtual;
    function burnFrom(address account, uint256 amount) public virtual;
    function mint(address account, uint256 amount) public virtual;
    function symbol() public view virtual returns (string memory);
}

// SPDX-License-Identifier: MIT
pragma experimental ABIEncoderV2;
pragma solidity =0.7.6;

interface ICurvePool {
    function A_precise() external view returns (uint256);
    function get_balances() external view returns (uint256[2] memory);
    function totalSupply() external view returns (uint256);
    function add_liquidity(uint256[2] memory amounts, uint256 min_mint_amount) external returns (uint256);
    function remove_liquidity_one_coin(uint256 _token_amount, int128 i, uint256 min_amount) external returns (uint256);
    function balances(int128 i) external view returns (uint256);
    function fee() external view returns (uint256);
    function coins(uint256 i) external view returns (address);
    function get_virtual_price() external view returns (uint256);
    function calc_token_amount(uint256[2] calldata amounts, bool deposit) external view returns (uint256);
    function calc_withdraw_one_coin(uint256 _token_amount, int128 i) external view returns (uint256);
    function exchange(int128 i, int128 j, uint256 dx, uint256 min_dy) external returns (uint256);
    function exchange_underlying(int128 i, int128 j, uint256 dx, uint256 min_dy) external returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
}

interface ICurveZap {
    function add_liquidity(address _pool, uint256[4] memory _deposit_amounts, uint256 _min_mint_amount) external returns (uint256);
    function calc_token_amount(address _pool, uint256[4] memory _amounts, bool _is_deposit) external returns (uint256);
}

interface ICurvePoolR {
    function exchange(int128 i, int128 j, uint256 dx, uint256 min_dy, address receiver) external returns (uint256);
    function exchange_underlying(int128 i, int128 j, uint256 dx, uint256 min_dy, address receiver) external returns (uint256);
    function remove_liquidity_one_coin(uint256 _token_amount, int128 i, uint256 min_amount, address receiver) external returns (uint256);
}

interface ICurvePool2R {
    function add_liquidity(uint256[2] memory amounts, uint256 min_mint_amount, address reciever) external returns (uint256);
    function remove_liquidity(uint256 _burn_amount, uint256[2] memory _min_amounts, address reciever) external returns (uint256[2] calldata);
    function remove_liquidity_imbalance(uint256[2] memory _amounts, uint256 _max_burn_amount, address reciever) external returns (uint256);
}

interface ICurvePool3R {
    function add_liquidity(uint256[3] memory amounts, uint256 min_mint_amount, address reciever) external returns (uint256);
    function remove_liquidity(uint256 _burn_amount, uint256[3] memory _min_amounts, address reciever) external returns (uint256[3] calldata);
    function remove_liquidity_imbalance(uint256[3] memory _amounts, uint256 _max_burn_amount, address reciever) external returns (uint256);
}

interface ICurvePool4R {
    function add_liquidity(uint256[4] memory amounts, uint256 min_mint_amount, address reciever) external returns (uint256);
    function remove_liquidity(uint256 _burn_amount, uint256[4] memory _min_amounts, address reciever) external returns (uint256[4] calldata);
    function remove_liquidity_imbalance(uint256[4] memory _amounts, uint256 _max_burn_amount, address reciever) external returns (uint256);
}

interface I3Curve {
    function get_virtual_price() external view returns (uint256);
}

interface ICurveFactory {
    function get_coins(address _pool) external view returns (address[4] calldata);
    function get_underlying_coins(address _pool) external view returns (address[8] calldata);
}

interface ICurveCryptoFactory {
    function get_coins(address _pool) external view returns (address[8] calldata);
}

interface ICurvePoolC {
    function exchange(uint256 i, uint256 j, uint256 dx, uint256 min_dy) external returns (uint256);
}

interface ICurvePoolNoReturn {
    function exchange(uint256 i, uint256 j, uint256 dx, uint256 min_dy) external;
    function add_liquidity(uint256[3] memory amounts, uint256 min_mint_amount) external;
    function remove_liquidity(uint256 _burn_amount, uint256[3] memory _min_amounts) external;
    function remove_liquidity_imbalance(uint256[3] memory _amounts, uint256 _max_burn_amount) external;
    function remove_liquidity_one_coin(uint256 _token_amount, uint256 i, uint256 min_amount) external;
}

interface ICurvePoolNoReturn128 {
    function exchange(int128 i, int128 j, uint256 dx, uint256 min_dy) external;
    function remove_liquidity_one_coin(uint256 _token_amount, int128 i, uint256 min_amount) external;
}

// SPDX-License-Identifier: MIT
pragma experimental ABIEncoderV2;
pragma solidity =0.7.6;

interface IFertilizer {
    struct Balance {
        uint128 amount;
        uint128 lastBpf;
    }
    function beanstalkUpdate(
        address account,
        uint256[] memory ids,
        uint128 bpf
    ) external returns (uint256);
    function beanstalkMint(address account, uint256 id, uint128 amount, uint128 bpf) external;
    function balanceOfFertilized(address account, uint256[] memory ids) external view returns (uint256);
    function balanceOfUnfertilized(address account, uint256[] memory ids) external view returns (uint256);
    function lastBalanceOf(address account, uint256 id) external view returns (Balance memory);
    function lastBalanceOfBatch(address[] memory account, uint256[] memory id) external view returns (Balance[] memory);
}

// SPDX-License-Identifier: MIT
pragma experimental ABIEncoderV2;
pragma solidity =0.7.6;
interface IProxyAdmin {
    function upgrade(address proxy, address implementation) external;
}

/*
 SPDX-License-Identifier: MIT
*/

pragma solidity =0.7.6;
pragma experimental ABIEncoderV2;

import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";

/**
 * @title Decimal
 * @author dYdX
 *
 * Library that defines a fixed-point number with 18 decimal places.
 */
library Decimal {
    using SafeMath for uint256;

    // ============ Constants ============

    uint256 constant BASE = 10**18;

    // ============ Structs ============


    struct D256 {
        uint256 value;
    }

    // ============ Static Functions ============

    function zero()
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: 0 });
    }

    function one()
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: BASE });
    }

    function from(
        uint256 a
    )
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: a.mul(BASE) });
    }

    function ratio(
        uint256 a,
        uint256 b
    )
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: getPartial(a, BASE, b) });
    }

    // ============ Self Functions ============

    function add(
        D256 memory self,
        uint256 b
    )
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: self.value.add(b.mul(BASE)) });
    }

    function sub(
        D256 memory self,
        uint256 b
    )
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: self.value.sub(b.mul(BASE)) });
    }

    function sub(
        D256 memory self,
        uint256 b,
        string memory reason
    )
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: self.value.sub(b.mul(BASE), reason) });
    }

    function mul(
        D256 memory self,
        uint256 b
    )
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: self.value.mul(b) });
    }

    function div(
        D256 memory self,
        uint256 b
    )
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: self.value.div(b) });
    }

    function pow(
        D256 memory self,
        uint256 b
    )
    internal
    pure
    returns (D256 memory)
    {
        if (b == 0) {
            return one();
        }

        D256 memory temp = D256({ value: self.value });
        for (uint256 i = 1; i < b; ++i) {
            temp = mul(temp, self);
        }

        return temp;
    }

    function add(
        D256 memory self,
        D256 memory b
    )
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: self.value.add(b.value) });
    }

    function sub(
        D256 memory self,
        D256 memory b
    )
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: self.value.sub(b.value) });
    }

    function sub(
        D256 memory self,
        D256 memory b,
        string memory reason
    )
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: self.value.sub(b.value, reason) });
    }

    function mul(
        D256 memory self,
        D256 memory b
    )
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: getPartial(self.value, b.value, BASE) });
    }

    function div(
        D256 memory self,
        D256 memory b
    )
    internal
    pure
    returns (D256 memory)
    {
        return D256({ value: getPartial(self.value, BASE, b.value) });
    }

    function equals(D256 memory self, D256 memory b) internal pure returns (bool) {
        return self.value == b.value;
    }

    function greaterThan(D256 memory self, D256 memory b) internal pure returns (bool) {
        return compareTo(self, b) == 2;
    }

    function lessThan(D256 memory self, D256 memory b) internal pure returns (bool) {
        return compareTo(self, b) == 0;
    }

    function greaterThanOrEqualTo(D256 memory self, D256 memory b) internal pure returns (bool) {
        return compareTo(self, b) > 0;
    }

    function lessThanOrEqualTo(D256 memory self, D256 memory b) internal pure returns (bool) {
        return compareTo(self, b) < 2;
    }

    function isZero(D256 memory self) internal pure returns (bool) {
        return self.value == 0;
    }

    function asUint256(D256 memory self) internal pure returns (uint256) {
        return self.value.div(BASE);
    }

    // ============ Core Methods ============

    function getPartial(
        uint256 target,
        uint256 numerator,
        uint256 denominator
    )
    private
    pure
    returns (uint256)
    {
        return target.mul(numerator).div(denominator);
    }

    function compareTo(
        D256 memory a,
        D256 memory b
    )
    private
    pure
    returns (uint256)
    {
        if (a.value == b.value) {
            return 1;
        }
        return a.value > b.value ? 2 : 0;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity =0.7.6;

/**
 * @author Brean
 * @dev Provides a set of functions to operate with Base64 strings.
 * @title Base64 is a 0.7.6 variation of Open Zeppelin's Base64.
 *
 */
library LibBytes64 {
    /**
     * @dev Base64 Encoding/Decoding Table
     */
    string internal constant _TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    /**
     * @dev Converts a `bytes` to its Bytes64 `string` representation.
     */
    function encode(bytes memory data) internal pure returns (string memory) {
        /**
         * Inspired by Brecht Devos (Brechtpd) implementation - MIT licence
         * https://github.com/Brechtpd/base64/blob/e78d9fd951e7b0977ddca77d92dc85183770daf4/base64.sol
         */
        if (data.length == 0) return "";

        // Loads the table into memory
        string memory table = _TABLE;

        // Encoding takes 3 bytes chunks of binary data from `bytes` data parameter
        // and split into 4 numbers of 6 bits.
        // The final Base64 length should be `bytes` data length multiplied by 4/3 rounded up
        // - `data.length + 2`  -> Round up
        // - `/ 3`              -> Number of 3-bytes chunks
        // - `4 *`              -> 4 characters for each chunk
        string memory result = new string(4 * ((data.length + 2) / 3));

        assembly {
            // Prepare the lookup table (skip the first "length" byte)
            let tablePtr := add(table, 1)

            // Prepare result pointer, jump over length
            let resultPtr := add(result, 32)

            // Run over the input, 3 bytes at a time
            for {
                let dataPtr := data
                let endPtr := add(data, mload(data))
            } lt(dataPtr, endPtr) {

            } {
                // Advance 3 bytes
                dataPtr := add(dataPtr, 3)
                let input := mload(dataPtr)

                // To write each character, shift the 3 bytes (18 bits) chunk
                // 4 times in blocks of 6 bits for each character (18, 12, 6, 0)
                // and apply logical AND with 0x3F which is the number of
                // the previous character in the ASCII table prior to the Base64 Table
                // The result is then added to the table to get the character to write,
                // and finally write it in the result pointer but with a left shift
                // of 256 (1 byte) - 8 (1 ASCII char) = 248 bits

                mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(shr(6, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(input, 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance
            }

            // When data `bytes` is not exactly 3 bytes long
            // it is padded with `=` characters at the end
            switch mod(mload(data), 3)
            case 1 {
                mstore8(sub(resultPtr, 1), 0x3d)
                mstore8(sub(resultPtr, 2), 0x3d)
            }
            case 2 {
                mstore8(sub(resultPtr, 1), 0x3d)
            }
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @author Publius
 * @title LibSafeMath128 is a uint128 variation of Open Zeppelin's Safe Math library.
**/
library LibSafeMath128 {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint128 a, uint128 b) internal pure returns (bool, uint128) {
        uint128 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint128 a, uint128 b) internal pure returns (bool, uint128) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint128 a, uint128 b) internal pure returns (bool, uint128) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint128 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint128 a, uint128 b) internal pure returns (bool, uint128) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint128 a, uint128 b) internal pure returns (bool, uint128) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint128 a, uint128 b) internal pure returns (uint128) {
        uint128 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint128 a, uint128 b) internal pure returns (uint128) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint128 a, uint128 b) internal pure returns (uint128) {
        if (a == 0) return 0;
        uint128 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint128 a, uint128 b) internal pure returns (uint128) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint128 a, uint128 b) internal pure returns (uint128) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint128 a, uint128 b, string memory errorMessage) internal pure returns (uint128) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint128 a, uint128 b, string memory errorMessage) internal pure returns (uint128) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint128 a, uint128 b, string memory errorMessage) internal pure returns (uint128) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @author Publius
 * @title LibSafeMath32 is a uint32 variation of Open Zeppelin's Safe Math library.
**/
library LibSafeMath32 {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint32 a, uint32 b) internal pure returns (bool, uint32) {
        uint32 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint32 a, uint32 b) internal pure returns (bool, uint32) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint32 a, uint32 b) internal pure returns (bool, uint32) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint32 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint32 a, uint32 b) internal pure returns (bool, uint32) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint32 a, uint32 b) internal pure returns (bool, uint32) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint32 a, uint32 b) internal pure returns (uint32) {
        uint32 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint32 a, uint32 b) internal pure returns (uint32) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint32 a, uint32 b) internal pure returns (uint32) {
        if (a == 0) return 0;
        uint32 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint32 a, uint32 b) internal pure returns (uint32) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint32 a, uint32 b) internal pure returns (uint32) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint32 a, uint32 b, string memory errorMessage) internal pure returns (uint32) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint32 a, uint32 b, string memory errorMessage) internal pure returns (uint32) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint32 a, uint32 b, string memory errorMessage) internal pure returns (uint32) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev String operations.
 */
library LibStrings {

    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = bytes1(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }

     function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` representation.
     */
    function toString(int256 value) internal pure returns(string memory){
        if(value > 0){
            return toString(uint256(value));
        } else {
            return string(abi.encodePacked("-", toString(uint256(-value))));
        }
    }

    /**
    * @notice Returns a substring of a string starting from startIndex and ending at endIndex.
    * @param str - The string to extract from.
    * @param startIndex - The index to start at.
    * @param endIndex - The index to end at.
    * Inspired by: https://ethereum.stackexchange.com/questions/31457/substring-in-solidity
    */
    function substring(
        string memory str,
        uint startIndex,
        uint endIndex
    ) internal pure returns (string memory) {
        bytes memory strBytes = bytes(str);
        bytes memory result = new bytes(endIndex - startIndex);
        for (uint i = startIndex; i < endIndex; i++) {
            result[i - startIndex] = strBytes[i];
        }
        return string(result);
    }

    /**
     * @notice Formats a uint128 number with 6 decimals to a string with 2 decimals.
     * @param number - The number to format.
     * @return string - The formatted string.
     */
    function formatUintWith6DecimalsTo2(uint128 number)
        internal 
        pure
        returns (string memory)
    {                                       
        // Cast to uint256 to be compatible with toString  
        string memory numString = toString(uint256(number));

        // If the number has fewer than 6 decimals, add trailing zeros
        while (bytes(numString).length < 7) {
            numString = string(abi.encodePacked("0", numString));
        }

        // Extract the integer part and the first 2 decimal places
        string memory integerPart = substring(numString, 0, bytes(numString).length - 6);
        string memory decimalPart = substring(numString, bytes(numString).length - 6, bytes(numString).length - 4);

        // Concatenate the integer part and the decimal part with a dot in between
        return string(abi.encodePacked(integerPart, ".", decimalPart));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;
pragma experimental ABIEncoderV2;

import "./Internalizer.sol";
import {IBeanstalk} from "./Internalizer.sol";

/**
 * @author publius
 * @title Barn Raiser 
 */

// Inherits Internalizer thus inherits ERC1155Upgradeable and the uri function
// The end Fert Facet only gets the interface of this contract
contract Fertilizer is Internalizer {

    event ClaimFertilizer(uint256[] ids, uint256 beans);

    using SafeERC20Upgradeable for IERC20;
    using SafeMathUpgradeable for uint256;
    using LibSafeMath128 for uint128;

    /**
     * @notice Calculates and updates the amount of beans a user should receive
     * given a set of fertilizer ids. Callable only by the Beanstalk contract.
     * @param account - the user to update
     * @param ids - an array of fertilizer ids 
     * @param bpf - the current beans per fertilizer
    */
    function beanstalkUpdate(
        address account,
        uint256[] memory ids,
        uint128 bpf
    ) external onlyOwner returns (uint256) {
        return __update(account, ids, uint256(bpf));
    }

    /**
     * @notice Mints a fertilizer to an account using a users specified balance
     * Called from FertilizerFacet.mintFertilizer()
     * @param account - the account to mint to
     * @param id - the id of the fertilizer to mint
     * @param amount - the amount of fertilizer to mint
     * @param bpf - the current beans per fertilizer
    */
    function beanstalkMint(address account, uint256 id, uint128 amount, uint128 bpf) external onlyOwner {
        if (_balances[id][account].amount > 0) {
            uint256[] memory ids = new uint256[](1);
            ids[0] = id;
            _update(account, ids, bpf);
        }
        _balances[id][account].lastBpf = bpf;
        _safeMint(
            account,
            id,
            amount,
            bytes('0')
        );
    }

    /** 
     * @notice hadles state updates before a fertilizer transfer
     * @param from - the account to transfer from
     * @param to - the account to transfer to
     * @param ids - an array of fertilizer ids 
    */
    function _beforeTokenTransfer(
        address, // operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory, // amounts
        bytes memory // data
    ) internal virtual override {
        uint256 bpf = uint256(IBeanstalk(owner()).beansPerFertilizer());
        if (from != address(0)) _update(from, ids, bpf);
        _update(to, ids, bpf);
    }

    /**
     * @notice Calculates and transfers the rewarded beans
     * from a set of fertilizer ids to an account's internal balance
     * @param account - the user to update
     * @param ids - an array of fertilizer ids
     * @param bpf - the beans per fertilizer
     */
    function _update(
        address account,
        uint256[] memory ids,
        uint256 bpf
    ) internal {
        uint256 amount = __update(account, ids, bpf);
        if (amount > 0) IBeanstalk(owner()).payFertilizer(account, amount);
    }

    /**
     * @notice Calculates and updates the amount of beans a user should receive
     * given a set of fertilizer ids and the current outstanding total beans per fertilizer
     * @param account - the user to update
     * @param ids - the fertilizer ids
     * @param bpf - the current beans per fertilizer
     * @return beans - the amount of beans to reward the fertilizer owner
     */
    function __update(
        address account,
        uint256[] memory ids,
        uint256 bpf
    ) internal returns (uint256 beans) {
        for (uint256 i; i < ids.length; ++i) {
            uint256 stopBpf = bpf < ids[i] ? bpf : ids[i];
            uint256 deltaBpf = stopBpf - _balances[ids[i]][account].lastBpf;
            if (deltaBpf > 0) {
                beans = beans.add(deltaBpf.mul(_balances[ids[i]][account].amount));
                _balances[ids[i]][account].lastBpf = uint128(stopBpf);
            }
        }
        emit ClaimFertilizer(ids, beans);
    }

    /**
     * @notice Returns the balance of fertilized beans of a fertilizer owner given
      a set of fertilizer ids
     * @param account - the fertilizer owner
     * @param ids - the fertilizer ids 
     * @return beans - the amount of fertilized beans the fertilizer owner has
     */
    function balanceOfFertilized(address account, uint256[] memory ids) external view returns (uint256 beans) {
        uint256 bpf = uint256(IBeanstalk(owner()).beansPerFertilizer());
        for (uint256 i; i < ids.length; ++i) {
            uint256 stopBpf = bpf < ids[i] ? bpf : ids[i];
            uint256 deltaBpf = stopBpf - _balances[ids[i]][account].lastBpf;
            beans = beans.add(deltaBpf.mul(_balances[ids[i]][account].amount));
        }
    }

    /**
     * @notice Returns the balance of unfertilized beans of a fertilizer owner given
      a set of fertilizer ids
     * @param account - the fertilizer owner
     * @param ids - the fertilizer ids 
     * @return beans - the amount of unfertilized beans the fertilizer owner has
     */
    function balanceOfUnfertilized(address account, uint256[] memory ids) external view returns (uint256 beans) {
        uint256 bpf = uint256(IBeanstalk(owner()).beansPerFertilizer());
        for (uint256 i; i < ids.length; ++i) {
            if (ids[i] > bpf) beans = beans.add(ids[i].sub(bpf).mul(_balances[ids[i]][account].amount));
        }
    }

    /**
     @notice Returns the value remaining to recapitalize beanstalk
     */
    function remaining() public view returns (uint256) {
        return IBeanstalk(owner()).remainingRecapitalization();
    }

    /**
     @notice Returns the id a fertilizer will receive when minted
    */
    function getMintId() public view returns (uint256) {
        return uint256(IBeanstalk(owner()).getEndBpf());
    }
}

/**
 * SPDX-License-Identifier: MIT
 **/

pragma solidity ^0.7.6;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts-upgradeable/token/ERC1155/ERC1155Upgradeable.sol";
/**
 * @author Publius
 * @dev Fertilizer tailored implemetation of the ERC-1155 standard.
 * We rewrite transfer and mint functions to allow the balance transfer function be overwritten as well.
 */
contract Fertilizer1155 is ERC1155Upgradeable {
    using AddressUpgradeable for address;

    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    )
        public
        virtual
        override
    {
        require(to != address(0), "ERC1155: transfer to the zero address");
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: caller is not owner nor approved"
        );

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, to, __asSingletonArray(id), __asSingletonArray(amount), data);

        _transfer(from, to, id, amount);

        emit TransferSingle(operator, from, to, id, amount);

        __doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data);
    }

    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    )
        public
        virtual
        override
    {
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
        require(to != address(0), "ERC1155: transfer to the zero address");
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: transfer caller is not owner nor approved"
        );

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, to, ids, amounts, data);

        for (uint256 i; i < ids.length; ++i) {
            _transfer(from, to, ids[i], amounts[i]);
        }

        emit TransferBatch(operator, from, to, ids, amounts);

        __doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data);
    }

    function _transfer(
        address from,
        address to,
        uint256 id,
        uint256 amount
    ) internal virtual {
    }

    function _safeMint(address to, uint256 id, uint256 amount, bytes memory data) internal virtual  {
        require(to != address(0), "ERC1155: mint to the zero address");

        address operator = _msgSender();

        _transfer(address(0), to, id, amount);

        emit TransferSingle(operator, address(0), to, id, amount);

        __doSafeTransferAcceptanceCheck(operator, address(0), to, id, amount, data);
    }

    // The 3 functions below are copied from:
    // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC1155/ERC1155.sol)
    // as they are private functions.

    function __doSafeTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try IERC1155ReceiverUpgradeable(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) {
                if (response != IERC1155ReceiverUpgradeable.onERC1155Received.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non ERC1155Receiver implementer");
            }
        }
    }

    function __doSafeBatchTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try IERC1155ReceiverUpgradeable(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (
                bytes4 response
            ) {
                if (response != IERC1155ReceiverUpgradeable.onERC1155BatchReceived.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non ERC1155Receiver implementer");
            }
        }
    }

    function __asSingletonArray(uint256 element) private pure returns (uint256[] memory) {
        uint256[] memory array = new uint256[](1);
        array[0] = element;

        return array;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;
pragma experimental ABIEncoderV2;

import {LibStrings} from "contracts/libraries/LibStrings.sol";
import {LibBytes64} from "contracts/libraries/LibBytes64.sol";
import {IBeanstalk} from "./Internalizer.sol";

/**
 * @title FertilizerImage
 * @author deadmanwalking
 */

contract FertilizerImage {

    address internal constant BEANSTALK = 0xC1E088fC1323b20BCBee9bd1B9fC9546db5624C5;

    //////////////////////   CONSTANTS TO ASSEMBLE SVG   ////////////////////////////

    string internal constant BASE_JSON_URI = "data:application/json;base64,";

    // Start for all fert svgs
    string private constant BASE_SVG_START = '<path d="M164.47 327.241 28.625 405.768l-.878-221.551 135.849-78.559.874 221.583Z" fill="#3DAA47"/><path d="m118.059 354.077-41.102 23.746-.874-221.551 41.101-23.778.875 221.583Z" fill="#3DAA47"/><path d="m26.825 184.242.87 221.567 93.367 54.339-.871-221.564-93.366-54.342Zm136.432-78.262.871 221.568 93.367 54.338-.871-221.564-93.367-54.342Z" fill="#3DB542"/>';

    // End for all fert svgs
    string private constant BASE_SVG_END = '<path d="m256.898 381.609-135.846 78.527-.877-221.551 135.849-78.56.874 221.584Z" fill="#6DCB60"/><path d="m210.486 408.445-41.101 23.745-.875-221.551 41.102-23.778.874 221.584Z" fill="#3DAA47"/><path d="m240.901 364.949-104.407 60.387-.323-157.477 104.408-60.351.322 157.441Z" fill="#fff"/><path d="M195.789 268.025c23.137-6.714 36.875 10.631 32.306 35.233-4.02 21.652-21.352 42.845-39.769 49.821-19.171 7.26-35.717-2.268-36.297-23.966-.665-24.922 19.413-54.021 43.76-61.088Z" fill="#46B955"/><path d="m206.417 275.615-28.08 73.577s-24.569-35.397 28.08-73.577Zm-23.027 68.362 19.561-50.916s23.831 17.189-19.561 50.916Z" fill="#fff"/>';

    // Top for the available fert svg
    string private constant FERT_TOP_AVAILABLE = '<path d="M76.634 162.915 212 84.133l44.034 75.909-135.842 78.544-43.557-75.671Z" fill="#81D672"/><path d="m124.966 134.97 40.624-24.001 44.031 75.906-41.098 23.765-43.557-75.67Z" fill="#46B955"/><path d="m212.125 47.918-.116 36.228-135.394 78.766.116-36.17c0-2.032-1.39-4.413-3.13-5.457-.87-.523-1.68-.523-2.261-.233l135.394-78.766c.58-.349 1.332-.29 2.203.233 1.736.989 3.188 3.425 3.188 5.4Z" fill="#6DCB60"/><path d="m165.713 74.752-.116 36.228-40.65 23.988.116-36.17c0-2.032-1.39-4.413-3.129-5.457-.872-.523-1.681-.523-2.262-.232l40.65-23.989c.58-.349 1.332-.29 2.203.233 1.739.986 3.188 3.425 3.188 5.4Z" fill="#42A84C"/><path d="M73.579 121.298c1.739 1.005 3.162 3.422 3.159 5.425l-.104 36.193 43.557 75.667-93.366-54.339 43.521-25.018.103-36.141c.004-2 1.39-2.795 3.13-1.787Z" fill="#2C9A2C"/><path d="M107.879 226.766 36.62 185.565l35.742-20.395 11.428 19.794 24.089 41.802Z" fill="#6DCB60"/><path d="m81.348 180.731-44.728 4.834 35.742-20.395 8.986 15.561Z" fill="#81D672"/>  <path d="M95.493 209.237c-9.447 2.966-17.845 10.637-21.62 21.552-.497 1.589-2.678 1.589-3.272 0-3.272-10.23-11.405-18.276-21.52-21.552-1.784-.598-1.784-2.782 0-3.377 10.115-3.312 18.174-11.506 21.52-21.552.594-1.689 2.778-1.689 3.272 0 3.768 10.689 11.563 18.195 21.62 21.552 1.687.595 1.687 2.779 0 3.377Z" fill="#fff"/>';

    // Top for the active fert svg
    string private constant FERT_TOP_ACTIVE ='<ellipse cx="113.247" cy="220.688" rx="38.717" ry="38.774" fill="#7F5533"/><ellipse cx="113.247" cy="220.688" rx="38.717" ry="38.774" fill="#7F5533"/><ellipse cx="70.013" cy="236.844" rx="38.717" ry="38.774" fill="#7F5533"/><path d="m26.825 184.242.87 221.567 93.367 54.339-.871-221.564-93.366-54.342Zm136.432-78.262.871 221.568 93.367 54.338-.871-221.564-93.367-54.342Z" fill="#3DB542"/><ellipse cx="156.805" cy="198.715" rx="38.717" ry="38.774" fill="#7F5533"/><ellipse cx="198.103" cy="189.668" rx="38.717" ry="38.774" fill="#7F5533"/>';

    /** 
        * @dev imageURI returns the base64 encoded image URI representation of the Fertilizer
        * @param _id - the id of the Fertilizer
        * @param bpfRemaining - the bpfRemaining of the Fertilizer
        * @return imageUri - the image URI representation of the Fertilizer
     */
    function imageURI(uint256 _id, uint128 bpfRemaining) public view returns (string memory) {
        return svgToImageURI(generateImageSvg(_id, bpfRemaining));
    }

    /////////////// FERTILIZER SVG ORDER ///////////////////
    // SVG_HEADER
    // BASE_SVG_START
    // FERT_SVG_TOP (available, active)
    // BASE_SVG_END
    // SVG_PRE_NUMBER 
    // BPF_REMAINING
    // END OF SVG

    /**
     * @dev generateImageSvg assembles the needed components for the Fertilizer svg
     * For use in the on-chain json fertilizer metadata
     * @param _id - the id of the Fertilizer
     * @param bpfRemaining - the bpfRemaining of the Fertilizer
     * @return imageUri - the image URI representation of the Fertilizer
     */
    function generateImageSvg(uint256 _id, uint128 bpfRemaining) internal view returns (string memory) {
        return string(
            abi.encodePacked(
                '<svg width="294" height="512" viewBox="0 0 294 512" fill="none" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">', // SVG HEADER
                BASE_SVG_START,
                getFertilizerStatusSvg(_id, bpfRemaining), // FERT_SVG_TOP (available, active)
                BASE_SVG_END,
                '<text font-family="sans-serif" font-size="20" x="20" y="490" fill="black" ><tspan dy="0" x="20">', // PRE NUMBER FOR BPF REMAINING
                LibStrings.formatUintWith6DecimalsTo2(bpfRemaining), // BPF_REMAINING with 2 decimal places
                " BPF Remaining </tspan></text></svg>" // END OF SVG
            )
        );
    }

    /**
     * @dev Returns the correct svg top for the Fertilizer status based on the bpfRemaining.
     * @param _id - the id of the Fertilizer
     * @param bpfRemaining - the bpfRemaining of the Fertilizer
     * @return fertilizerStatusSvg an svg top for the correct Fertilizer status
     */
    function getFertilizerStatusSvg(uint256 _id, uint128 bpfRemaining) internal view returns (string memory) {

        uint256 fertilizerSupply = IBeanstalk(BEANSTALK).getFertilizer(
            uint128(_id)
        );

        string memory fertilizerStatusSvg = FERT_TOP_AVAILABLE;

        if (fertilizerSupply > 0) {
            fertilizerStatusSvg = bpfRemaining > 0
                ? FERT_TOP_ACTIVE
                : ''; // a used fert (bpfRemaining = 0) has no top
        }

        return fertilizerStatusSvg;
    }

    /// @dev Helper function that converts an svg to a bade64 encoded image URI.
    function svgToImageURI(string memory svg)
        internal
        pure
        returns (string memory)
    {
        return string(
            abi.encodePacked("data:image/svg+xml;base64,", LibBytes64.encode(bytes(string(abi.encodePacked(svg)))))
        );
    }

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;
pragma experimental ABIEncoderV2;


import "@openzeppelin/contracts-upgradeable/utils/StringsUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/SafeERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./Fertilizer1155.sol";
import "contracts/libraries/LibSafeMath32.sol";
import "contracts/libraries/LibSafeMath128.sol";
import "./FertilizerImage.sol";
import {LibBytes64} from "contracts/libraries/LibBytes64.sol";

/**
 * @author publius, deadmanwalking
 * @title Fertilizer before the Unpause
 */

// interface to interact with the Beanstalk contract
interface IBeanstalk {
    function payFertilizer(address account, uint256 amount) external;
    function beansPerFertilizer() external view returns (uint128);
    function getEndBpf() external view returns (uint128);
    function remainingRecapitalization() external view returns (uint256);
    function getFertilizer(uint128) external view returns (uint256);
}

contract Internalizer is OwnableUpgradeable, ReentrancyGuardUpgradeable, Fertilizer1155, FertilizerImage {

    using SafeERC20Upgradeable for IERC20;
    using LibSafeMath128 for uint128;
    using LibStrings for uint256;

    struct Balance {
        uint128 amount;
        uint128 lastBpf;
    }

    function __Internallize_init(string memory uri_) internal {
        __Ownable_init();
        __ERC1155_init(uri_);
        __ReentrancyGuard_init();
    }

    mapping(uint256 => mapping(address => Balance)) internal _balances;

    string private _uri;

    ///////////////////// NEW URI FUNCTION ///////////////////////

    /**
     * @notice Assembles and returns a base64 encoded json metadata
     * URI for a given fertilizer ID.
     * Need to override because the contract indirectly
     * inherits from ERC1155.
     * @param _id - the id of the fertilizer
     * @return - the json metadata URI
     */
    function uri(uint256 _id)
        external
        view
        virtual
        override 
        returns (string memory)
    {

        uint128 bpfRemaining = calculateBpfRemaining(_id);

        // generate the image URI
        string memory imageUri = imageURI(_id , bpfRemaining);

        // assemble and return the json URI
        return (
            string(
                abi.encodePacked(
                    BASE_JSON_URI,
                    LibBytes64.encode(
                        bytes(
                            abi.encodePacked(
                                '{"name": "Fertilizer - ',
                                _id.toString(),
                                '", "external_url": "https://fert.bean.money/',
                                _id.toString(),
                                '.html", ',
                                '"description": "A trusty constituent of any Farmers toolbox, ERC-1155 FERT has been known to spur new growth on seemingly dead farms. Once purchased and deployed into fertile ground by Farmers, Fertilizer generates new Sprouts: future Beans yet to be repaid by Beanstalk in exchange for doing the work of Replanting the protocol.", "image": "',
                                imageUri,
                                '", "attributes": [{ "trait_type": "BPF Remaining","display_type": "boost_number","value": ',
                                LibStrings.formatUintWith6DecimalsTo2(bpfRemaining),
                                " }]}"
                            )
                        )
                    )
                )
            )
        );
    }

    /**
     * @notice Returns the beans per fertilizer remaining for a given fertilizer Id.
     * @param id - the id of the fertilizer
     * Formula: bpfRemaining = id - s.bpf
     * Calculated here to avoid uint underflow 
     * Solidity 0.8.0 has underflow protection and the tx would revert but we are using 0.7.6
     */
    function calculateBpfRemaining(uint256 id) internal view returns (uint128) {
        // make sure it does not underflow
        if (uint128(id) >= IBeanstalk(BEANSTALK).beansPerFertilizer()) {
            return uint128(id) - IBeanstalk(BEANSTALK).beansPerFertilizer() ;
        } else {
            return 0;
        }
    } 

    function name() external pure returns (string memory) {
        return "Fertilizer";
    }

    function symbol() external pure returns (string memory) {
        return "FERT";
    }

    function balanceOf(address account, uint256 id) public view virtual override returns (uint256) {
        require(account != address(0), "ERC1155: balance query for the zero address");
        return _balances[id][account].amount;
    }

    function lastBalanceOf(address account, uint256 id) public view returns (Balance memory) {
        require(account != address(0), "ERC1155: balance query for the zero address");
        return _balances[id][account];
    }

    function lastBalanceOfBatch(address[] memory accounts, uint256[] memory ids) external view returns (Balance[] memory balances) {
        balances = new Balance[](accounts.length);
        for (uint256 i; i < accounts.length; ++i) {
            balances[i] = lastBalanceOf(accounts[i], ids[i]);
        }
    }

    function _transfer(
        address from,
        address to,
        uint256 id,
        uint256 amount
    ) internal virtual override {
        uint128 _amount = uint128(amount);
        if (from != address(0)) {
            uint128 fromBalance = _balances[id][from].amount;
            require(uint256(fromBalance) >= amount, "ERC1155: insufficient balance for transfer");
            // Because we know fromBalance >= amount, we know amount < type(uint128).max
            _balances[id][from].amount = fromBalance - _amount;
        }
        _balances[id][to].amount = _balances[id][to].amount.add(_amount);
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[],"name":"init","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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