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// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

import "solowei/contracts/TwoStageOwnable.sol";
import "./StakingBase.sol";

contract Staking is StakingBase, TwoStageOwnable {
    uint256 private _freeSize;
    uint256 private _intervalsCount;
    uint256 private _size;

    uint256 private _intervalDuration;
    uint256 private _rewardPool;
    uint256 private _totalStaked;
    mapping(address => StakeData[]) private _stakedInformation;

    function getTimestamp() internal virtual view returns (uint256) {
        return block.timestamp;
    }

    function freeSize() public view returns (uint256) {
        return _freeSize;
    }

    function intervalsCount() public view returns (uint256) {
        return _intervalsCount;
    }

    function intervalDuration() public view returns (uint256) {
        return _intervalDuration;
    }

    function requiredRewards() public view returns (uint256) {
        return _calculateRewards(_totalStaked);
    }

    function rewardPool() public view returns (uint256) {
        return _rewardPool;
    }

    function size() public view returns (uint256) {
        return _size;
    }

    function totalStaked() public view returns (uint256) {
        return _totalStaked;
    }

    function availableToWithdraw(address account, uint256 id) public view returns (uint256 amountToWithdraw) {
        StakeData storage stake_ = _getStake(account, id);
        uint256 pastIntervalsCount = getTimestamp().sub(stake_.startsAt).div(_intervalDuration);
        amountToWithdraw = pastIntervalsCount < _intervalsCount
            ? stake_.rewards.mul(pastIntervalsCount).div(_intervalsCount)
            : stake_.rewards.add(stake_.amount);
        amountToWithdraw = amountToWithdraw.sub(stake_.withdrawn);
    }

    function getStake(address account, uint256 id) public view returns (StakeData memory) {
        return _getStake(account, id);
    }

    function getStakesCount(address account) public view returns (uint256) {
        return _stakedInformation[account].length;
    }

    function getStakes(
        address account,
        uint256 offset,
        uint256 limit
    ) public view returns (StakeData[] memory stakeData) {
        StakeData[] storage stakedInformation = _stakedInformation[account];
        uint256 stakedInformationLength = stakedInformation.length;
        uint256 to = offset.add(limit);
        if (stakedInformationLength < to) to = stakedInformationLength;
        stakeData = new StakeData[](to - offset);
        for (uint256 i = offset; i < to; i++) {
            stakeData[i - offset] = stakedInformation[stakedInformationLength - i - 1];
        }
    }

    constructor(
        address owner_,
        IERC20 stakingToken_,
        uint256 revenue_,
        uint256 intervalsCount_,
        uint256 intervalDuration_,
        uint256 size_
    ) public TwoStageOwnable(owner_) {
        require(revenue_ > 0, "Revenue not positive");
        require(intervalsCount_ > 0, "IntervalsCount not positive");
        require(intervalDuration_ > 0, "IntervalDuration not positive");
        require(size_ > 0, "Size not positive");
        stakingToken = stakingToken_;
        revenue = revenue_;
        _intervalsCount = intervalsCount_;
        _intervalDuration = intervalDuration_ * 1 days;
        _size = size_;
        _freeSize = size_;
    }

    function decreaseRewardPool(uint256 amount) external onlyOwner onlyPositiveAmount(amount) returns (bool) {
        address caller = msg.sender;
        uint256 requiredRewards_ = requiredRewards();
        require(_rewardPool > requiredRewards_, "No tokens to decrease");
        require(amount <= _rewardPool.sub(requiredRewards_), "Not enough amount");
        stakingToken.safeTransfer(caller, amount);
        _rewardPool = _rewardPool.sub(amount);
        emit RewardPoolDecreased(caller, amount);
        return true;
    }

    function increaseRewardPool(uint256 amount) external onlyOwner onlyPositiveAmount(amount) returns (bool) {
        address caller = msg.sender;
        stakingToken.safeTransferFrom(caller, address(this), amount);
        _rewardPool = _rewardPool.add(amount);
        emit RewardPoolIncreased(caller, amount);
        return true;
    }

    function setMinStakeAmount(uint256 value) external onlyOwner returns (bool) {
        minStakeAmount = value;
        emit MinStakeAmountUpdated(msg.sender, value);
        return true;
    }

    function stake(uint256 amount) external onlyPositiveAmount(amount) returns (bool) {
        require(amount >= minStakeAmount, "Amount lt minimum stake");
        require(amount <= _freeSize, "Amount gt free size");
        _freeSize = _freeSize.sub(amount);
        uint256 rewards = _calculateRewards(amount);
        require(rewards <= _rewardPool.sub(requiredRewards()), "Not enough rewards");
        address caller = msg.sender;
        uint256 stakeId = _stakedInformation[caller].length;
        _totalStaked = _totalStaked.add(amount);
        _stakedInformation[caller].push();
        StakeData storage stake_ = _stakedInformation[caller][stakeId];
        stake_.amount = amount;
        stake_.rewards = rewards;
        stake_.startsAt = getTimestamp();
        stakingToken.safeTransferFrom(caller, address(this), amount);
        emit Staked(caller, stakeId, amount);
        return true;
    }

    function withdraw(uint256 id, uint256 amount) external onlyPositiveAmount(amount) returns (bool) {
        address caller = msg.sender;
        require(amount <= availableToWithdraw(caller, id), "Not enough available tokens");
        StakeData storage stake_ = _stakedInformation[caller][id];
        (uint256 rewardsSubValue, uint256 totalStakedSubValue) = _calculateWithdrawAmountParts(stake_, amount);
        _rewardPool = _rewardPool.sub(rewardsSubValue);
        _totalStaked = _totalStaked.sub(totalStakedSubValue);
        stake_.withdrawn = stake_.withdrawn.add(amount);
        stakingToken.safeTransfer(caller, amount);
        emit Withdrawn(caller, id, amount);
        return true;
    }

    function _calculateRewards(uint256 amount) internal view returns (uint256) {
        return amount.mul(revenue).div(100);
    }

    function _getStake(address account, uint256 id) internal view returns (StakeData storage) {
        require(id < _stakedInformation[account].length, "Invalid stake id");
        return _stakedInformation[account][id];
    }
}

// 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 >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.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 SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 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(IERC20 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(IERC20 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(IERC20 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(IERC20 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 Address {
    /**
     * @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);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(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 ^0.6.12;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";

abstract contract StakingBase {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    struct StakeData {
        uint256 amount;
        uint256 rewards;
        uint256 withdrawn;
        uint256 startsAt;
    }

    uint256 public minStakeAmount;
    uint256 public revenue;
    IERC20 public stakingToken;

    event MinStakeAmountUpdated(address indexed owner, uint256 value);
    event Staked(address indexed account, uint256 stakeId, uint256 amount);
    event RewardPoolDecreased(address indexed owner, uint256 amount);
    event RewardPoolIncreased(address indexed owner, uint256 amount);
    event Withdrawn(address indexed account, uint256 stakeId, uint256 amount);

    function _calculateWithdrawAmountParts(
        StakeData memory stake_,
        uint256 amount
    ) internal pure returns (uint256 rewardsSubValue, uint256 totalStakedSubValue) {
        if (stake_.withdrawn < stake_.rewards) {
            uint256 difference = stake_.rewards.sub(stake_.withdrawn);
            if (difference >= amount) {
                rewardsSubValue = amount;
            } else {
                rewardsSubValue = difference;
                totalStakedSubValue = amount.sub(difference);
            }
        } else {
            totalStakedSubValue = amount;
        }
    }

    modifier onlyPositiveAmount(uint256 amount) {
        require(amount > 0, "Amount not positive");
        _;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;

abstract contract TwoStageOwnable {
    address private _nominatedOwner;
    address private _owner;

    function nominatedOwner() public view returns (address) {
        return _nominatedOwner;
    }

    function owner() public view returns (address) {
        return _owner;
    }

    event OwnerChanged(address indexed newOwner);
    event OwnerNominated(address indexed nominatedOwner);

    constructor(address owner_) internal {
        require(owner_ != address(0), "Owner is zero");
        _setOwner(owner_);
    }

    function acceptOwnership() external returns (bool success) {
        require(msg.sender == _nominatedOwner, "Not nominated to ownership");
        _setOwner(_nominatedOwner);
        return true;
    }

    function nominateNewOwner(address owner_) external onlyOwner returns (bool success) {
        _nominateNewOwner(owner_);
        return true;
    }

    modifier onlyOwner {
        require(msg.sender == _owner, "Not owner");
        _;
    }

    function _nominateNewOwner(address owner_) internal {
        if (_nominatedOwner == owner_) return;
        require(_owner != owner_, "Already owner");
        _nominatedOwner = owner_;
        emit OwnerNominated(owner_);
    }

    function _setOwner(address newOwner) internal {
        if (_owner == newOwner) return;
        _owner = newOwner;
        _nominatedOwner = address(0);
        emit OwnerChanged(newOwner);
    }
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "constantinople",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"owner_","type":"address"},{"internalType":"contract IERC20","name":"stakingToken_","type":"address"},{"internalType":"uint256","name":"revenue_","type":"uint256"},{"internalType":"uint256","name":"intervalsCount_","type":"uint256"},{"internalType":"uint256","name":"intervalDuration_","type":"uint256"},{"internalType":"uint256","name":"size_","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"MinStakeAmountUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"nominatedOwner","type":"address"}],"name":"OwnerNominated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"RewardPoolDecreased","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"RewardPoolIncreased","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"stakeId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Staked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"stakeId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdrawn","type":"event"},{"inputs":[],"name":"acceptOwnership","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"}],"name":"availableToWithdraw","outputs":[{"internalType":"uint256","name":"amountToWithdraw","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"decreaseRewardPool","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"freeSize","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"}],"name":"getStake","outputs":[{"components":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"rewards","type":"uint256"},{"internalType":"uint256","name":"withdrawn","type":"uint256"},{"internalType":"uint256","name":"startsAt","type":"uint256"}],"internalType":"struct StakingBase.StakeData","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"offset","type":"uint256"},{"internalType":"uint256","name":"limit","type":"uint256"}],"name":"getStakes","outputs":[{"components":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"rewards","type":"uint256"},{"internalType":"uint256","name":"withdrawn","type":"uint256"},{"internalType":"uint256","name":"startsAt","type":"uint256"}],"internalType":"struct StakingBase.StakeData[]","name":"stakeData","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"getStakesCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"increaseRewardPool","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"intervalDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"intervalsCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minStakeAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner_","type":"address"}],"name":"nominateNewOwner","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"nominatedOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"requiredRewards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"revenue","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardPool","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"name":"setMinStakeAmount","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"size","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"stake","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stakingToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalStaked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000009f88f2ec52727eefab23dfa46609675bd04ae9bc000000000000000000000000f0c5831ec3da15f3696b4dad8b21c7ce2f007f28000000000000000000000000000000000000000000000000000000000000002d0000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000005b000000000000000000000000000000000000000000000000000540929c9533e0

-----Decoded View---------------
Arg [0] : owner_ (address): 0x9f88F2Ec52727EEfAB23dfa46609675BD04AE9bc
Arg [1] : stakingToken_ (address): 0xF0c5831EC3Da15f3696B4DAd8B21c7Ce2f007f28
Arg [2] : revenue_ (uint256): 45
Arg [3] : intervalsCount_ (uint256): 8
Arg [4] : intervalDuration_ (uint256): 91
Arg [5] : size_ (uint256): 1478373319980000

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000009f88f2ec52727eefab23dfa46609675bd04ae9bc
Arg [1] : 000000000000000000000000f0c5831ec3da15f3696b4dad8b21c7ce2f007f28
Arg [2] : 000000000000000000000000000000000000000000000000000000000000002d
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000008
Arg [4] : 000000000000000000000000000000000000000000000000000000000000005b
Arg [5] : 000000000000000000000000000000000000000000000000000540929c9533e0