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// SPDX-License-Identifier: MIT
// UBDNDistributor ERC20 Token Distributor
pragma solidity 0.8.19;


import "SafeERC20.sol";
import "Ownable.sol";
import "IERC20Mint.sol";


contract UBDNLockerDistributor is Ownable {
    using SafeERC20 for IERC20Mint;
    
    struct Lock {
        uint256 amount;
        uint256 lockedUntil;
    }

    uint256 constant public START_PRICE = 1;         // 1 stable coin unit, not decimal. 
    uint256 constant public PRICE_INCREASE_STEP = 1; // 1 stable coin unit, not decimal. 
    uint256 constant public INCREASE_FROM_ROUND = 1;
    uint256 constant public ROUND_VOLUME = 1_000_000e18; // in wei
    uint256 constant public ADD_NEW_PAYMENT_TOKEN_TIMELOCK = 48 hours;
    uint256 constant public EMERGENCY_PAYMENT_PAUSE = 1 hours;

    
    uint256 public LOCK_PERIOD = 90 days;
    uint256 public distributedAmount;

    IERC20Mint public distributionToken;
    mapping (address => uint256) public paymentTokens;
    mapping (address => Lock[]) public userLocks;
    mapping (address => bool) public isGuardian;

    event DistributionTokenSet(address indexed Token);
    event PaymentTokenStatus(address indexed Token, bool Status);
    event Purchase(
        address indexed User,
        uint256 indexed PurchaseAmount, 
        address indexed PaymentToken, 
        uint256 PaymentAmount
    );
    event Claimed(address User, uint256 Amount, uint256 Timestamp);
    event PaymentTokenPaused(address indexed Token, uint256 Until);

    constructor (uint256 _lockPeriod) {
        if (_lockPeriod > 0) {
           LOCK_PERIOD = _lockPeriod;
        }
    }

    /// @notice Buy distibuting token with stable coins
    /// @dev _inAmount in wei. Don't forget approve
    /// @param _paymentToken stable coin address
    /// @param _inAmount amount of stable to spent
    /// @param _outNotLess minimal desired amount of distributed tokens (anti slippage)
    function buyTokensForExactStableWithSlippage(
        address _paymentToken, 
        uint256 _inAmount, 
        uint256 _outNotLess
    ) 
        external 
    {
        require(
            _calcTokensForExactStable(_paymentToken,_inAmount) >= _outNotLess, 
            "Slippage occur"
        );
        buyTokensForExactStable(_paymentToken, _inAmount); 

    }     

    /// @notice Buy distibuting token with stable coins
    /// @dev _inAmount in wei. Don't forget approve
    /// @param _paymentToken stable coin address
    /// @param _inAmount amount of stable to spent
    function buyTokensForExactStable(address _paymentToken, uint256 _inAmount) 
        public 
    {
        require(address(distributionToken) != address(0), 'Distribution not Define');

        require(_isValidForPayment(_paymentToken), 'This payment token not supported');
        
        // 1. Calc distribution tokens
        uint256 outAmount = _calcTokensForExactStable(_paymentToken,_inAmount);
        require(outAmount > 0, 'Cant buy zero');
        
        // 2. Save lockInfo
        _newLock(msg.sender, outAmount);
        distributedAmount += outAmount;
        
        // 3. Mint distribution token
        distributionToken.mint(address(this), outAmount);
        emit Purchase(msg.sender, outAmount, _paymentToken, _inAmount);

        // 4. Receive payment
        IERC20Mint(_paymentToken).safeTransferFrom(msg.sender, owner(),_inAmount);
    }

    /// @notice Claim available for now tokens
    function claimTokens() external {
        uint256 claimAmount;
        // calc and mark as claimed
        for (uint256 i = 0; i < userLocks[msg.sender].length; ++i){
            if (block.timestamp >= userLocks[msg.sender][i].lockedUntil){
                claimAmount += userLocks[msg.sender][i].amount;
                userLocks[msg.sender][i].amount = 0;
            }
        }
        require(claimAmount > 0, 'Nothing to claim');
        distributionToken.safeTransfer(msg.sender, claimAmount);
        emit Claimed(msg.sender, claimAmount, block.timestamp);
    }

    /// @notice Temprory disable payments with token
    /// @param _paymentToken stable coin address
    function emergencyPause(address _paymentToken) external {
        require(isGuardian[msg.sender], "Only for approved guardians");
        if (
                paymentTokens[_paymentToken] > 0 // token enabled 
                && paymentTokens[_paymentToken] <= block.timestamp // no timelock 
            ) 
        {
            paymentTokens[_paymentToken] = block.timestamp + EMERGENCY_PAYMENT_PAUSE;
            emit PaymentTokenPaused(_paymentToken, paymentTokens[_paymentToken]);
        }
    }

    ///////////////////////////////////////////////////////////
    ///////    Admin Functions        /////////////////////////
    ///////////////////////////////////////////////////////////
    function setPaymentTokenStatus(address _token, bool _state) 
        external 
        onlyOwner 
    {
        if (_state ) {
            paymentTokens[_token] = block.timestamp + ADD_NEW_PAYMENT_TOKEN_TIMELOCK;    
        } else {
            paymentTokens[_token] = 0;
        }
        
        emit PaymentTokenStatus(_token, _state);
    }

    function setDistributionToken(address _token) 
        external 
        onlyOwner 
    {
        require(address(distributionToken) == address(0), "Can call only once");
        distributionToken = IERC20Mint(_token);
        emit DistributionTokenSet(_token);
    }

    function setGuardianStatus(address _guardian, bool _state)
        external
        onlyOwner
    {
        isGuardian[_guardian] = _state;
    }

    ///////////////////////////////////////////////////////////

    /// @notice Returns amount of distributing tokens that will be
    /// get by user if he(she) pay given stable coin amount
    /// @dev _inAmount must be with given in wei (eg 1 USDT =1000000)
    /// @param _paymentToken stable coin address
    /// @param _inAmount stable coin amount that user want to spend
    function calcTokensForExactStable(address _paymentToken, uint256 _inAmount) 
        external 
        view 
        returns(uint256) 
    {
        return _calcTokensForExactStable(_paymentToken, _inAmount);
    }

    /// @notice Returns amount of stable coins that must be spent
    /// for user get given  amount of distributing token
    /// @dev _outAmount must be with given in wei (eg 1 UBDN =1e18)
    /// @param _paymentToken stable coin address
    /// @param _outAmount distributing token amount that user want to get
    function calcStableForExactTokens(address _paymentToken, uint256 _outAmount) 
        external 
        view 
        returns(uint256) 
    {
        return _calcStableForExactTokens(_paymentToken, _outAmount);
    }

    /// @notice Returns price without decimals and distributing token rest
    /// for given round
    /// @dev returns tuple  (price, rest)
    /// @param _round round number
    function priceInUnitsAndRemainByRound(uint256 _round) 
        external 
        view 
        returns(uint256, uint256) 
    {
        return _priceInUnitsAndRemainByRound(_round);
    }

    /// @notice Returns array of user's locks
    /// @dev returns tuple  array of (amount, unlock timestamp)
    /// @param _user user address 
    function getUserLocks(address _user) 
        public 
        view 
        returns(Lock[] memory)
    {
        return userLocks[_user];
    }

    /// @notice Returns array of user's locks
    /// @dev returns tuple  array of (total locked amount, available now)
    /// @param _user user address 
    function getUserAvailableAmount(address _user)
        public
        view
        returns(uint256 total, uint256 availableNow)
    {
        for (uint256 i = 0; i < userLocks[_user].length; ++i){
            total += userLocks[_user][i].amount;
            if (block.timestamp >= userLocks[_user][i].lockedUntil){
                availableNow += userLocks[_user][i].amount;
            }
        }
    }

    /// @notice Returns current round number
    function getCurrentRound() external view returns(uint256){
        return _currenRound();   
    }

    /////////////////////////////////////////////////////////////////////
    function _newLock(address _user, uint256 _lockAmount) internal {
        userLocks[_user].push(
            Lock(_lockAmount, block.timestamp + LOCK_PERIOD)
        );
    }

    function _calcStableForExactTokens(address _paymentToken, uint256 _outAmount) 
        internal
        virtual 
        view 
        returns(uint256 inAmount) 
    {
        uint256 outA = _outAmount;
        uint256 curR = _currenRound();
        uint256 curPrice; 
        uint256 curRest;
        uint8 payTokenDecimals = IERC20Mint(_paymentToken).decimals();
        uint8 dstTokenDecimals = distributionToken.decimals();
        while (outA > 0) {
            (curPrice, curRest) = _priceInUnitsAndRemainByRound(curR); 
            if (outA > curRest) {
                inAmount += curRest 
                    * curPrice * 10**payTokenDecimals
                    / (10**dstTokenDecimals);
                outA -= curRest;
                ++ curR;
            } else {
                inAmount += outA 
                    * curPrice * 10**payTokenDecimals
                    / (10**dstTokenDecimals);
                return inAmount;
            }
        }
    }

    function _calcTokensForExactStable(address _paymentToken, uint256 _inAmount) 
        internal
        virtual 
        view 
        returns(uint256 outAmount) 
    {
        uint256 inA = _inAmount;
        uint256 curR = _currenRound();
        uint256 curPrice; 
        uint256 curRest;
        uint8 payTokenDecimals = IERC20Mint(_paymentToken).decimals();
        uint8 dstTokenDecimals = distributionToken.decimals();
        while (inA > 0) {
            (curPrice, curRest) = _priceInUnitsAndRemainByRound(curR); 
            if (
                // calc out amount
                inA 
                * (10**dstTokenDecimals)
                / (curPrice * 10**payTokenDecimals)
                   > curRest
                ) 
            {
                // Case when inAmount more then price of all tokens 
                // in current round
                outAmount += curRest;
                inA -= curRest 
                       * curPrice * 10**payTokenDecimals
                       / (10**dstTokenDecimals);
                ++ curR;
            } else {
                // Case when inAmount less or eqal then price of all tokens 
                // in current round
                outAmount += inA 
                  * 10**dstTokenDecimals
                  / (curPrice * 10**payTokenDecimals);
                return outAmount;
            }
        }
    }

    function _priceInUnitsAndRemainByRound(uint256 _round) 
        internal 
        view 
        virtual 
        returns(uint256 price, uint256 rest) 
    {
        if (_round < INCREASE_FROM_ROUND){
            price = START_PRICE;
        } else {
            price = START_PRICE + PRICE_INCREASE_STEP * (_round - INCREASE_FROM_ROUND + 1); 
        }
        
        // in finished rounds rest always zero
        if (_round < _currenRound()){
            rest = 0;
        
        // in current round need calc 
        } else if (_round == _currenRound()){
            if (_round == 1){
                // first round
                rest = ROUND_VOLUME - distributedAmount; 
            } else {
                rest = ROUND_VOLUME - (distributedAmount % ROUND_VOLUME); 
            } 
        
        // in future rounds rest always ROUND_VOLUME
        } else {
            rest = ROUND_VOLUME;
        }
    }

    function _currenRound() internal view virtual returns(uint256){
        return distributedAmount / ROUND_VOLUME + 1;
    }

    function _isValidForPayment(address _paymentToken) internal view returns(bool){
        if (paymentTokens[_paymentToken] == 0) {
            return false;
        }
        require(
            paymentTokens[_paymentToken] < block.timestamp,
            "Token paused or timelocked"
        );
        return true; 
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "IERC20.sol";
import "draft-IERC20Permit.sol";
import "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 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'
        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) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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");

        (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "Context.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 Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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 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 Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

import "IERC20Metadata.sol";

interface IERC20Mint is IERC20Metadata {
	function mint(address _for, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

{
  "evmVersion": "istanbul",
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "libraries": {
    "UBDNLockerDistributor.sol": {}
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"uint256","name":"_lockPeriod","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"User","type":"address"},{"indexed":false,"internalType":"uint256","name":"Amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"Timestamp","type":"uint256"}],"name":"Claimed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"Token","type":"address"}],"name":"DistributionTokenSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"Token","type":"address"},{"indexed":false,"internalType":"uint256","name":"Until","type":"uint256"}],"name":"PaymentTokenPaused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"Token","type":"address"},{"indexed":false,"internalType":"bool","name":"Status","type":"bool"}],"name":"PaymentTokenStatus","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"User","type":"address"},{"indexed":true,"internalType":"uint256","name":"PurchaseAmount","type":"uint256"},{"indexed":true,"internalType":"address","name":"PaymentToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"PaymentAmount","type":"uint256"}],"name":"Purchase","type":"event"},{"inputs":[],"name":"ADD_NEW_PAYMENT_TOKEN_TIMELOCK","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"EMERGENCY_PAYMENT_PAUSE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"INCREASE_FROM_ROUND","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"LOCK_PERIOD","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PRICE_INCREASE_STEP","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ROUND_VOLUME","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"START_PRICE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_paymentToken","type":"address"},{"internalType":"uint256","name":"_inAmount","type":"uint256"}],"name":"buyTokensForExactStable","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_paymentToken","type":"address"},{"internalType":"uint256","name":"_inAmount","type":"uint256"},{"internalType":"uint256","name":"_outNotLess","type":"uint256"}],"name":"buyTokensForExactStableWithSlippage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_paymentToken","type":"address"},{"internalType":"uint256","name":"_outAmount","type":"uint256"}],"name":"calcStableForExactTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_paymentToken","type":"address"},{"internalType":"uint256","name":"_inAmount","type":"uint256"}],"name":"calcTokensForExactStable","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claimTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"distributedAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"distributionToken","outputs":[{"internalType":"contract IERC20Mint","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_paymentToken","type":"address"}],"name":"emergencyPause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getCurrentRound","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"getUserAvailableAmount","outputs":[{"internalType":"uint256","name":"total","type":"uint256"},{"internalType":"uint256","name":"availableNow","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"getUserLocks","outputs":[{"components":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"lockedUntil","type":"uint256"}],"internalType":"struct UBDNLockerDistributor.Lock[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isGuardian","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"paymentTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_round","type":"uint256"}],"name":"priceInUnitsAndRemainByRound","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"setDistributionToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_guardian","type":"address"},{"internalType":"bool","name":"_state","type":"bool"}],"name":"setGuardianStatus","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"bool","name":"_state","type":"bool"}],"name":"setPaymentTokenStatus","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"userLocks","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"lockedUntil","type":"uint256"}],"stateMutability":"view","type":"function"}]

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0000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _lockPeriod (uint256): 0

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000