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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./interfaces/IMintableERC20.sol";
import "./NftStakeVaultV2.sol";

/** @title SamuraiSagaStakeVaultV2
 */
contract SamuraiSagaStakeVaultV2 is NftStakeVaultV2 {
    event BatchStake(address indexed account, uint256 poolId, uint256[] tokenIds);
    event BatchUnstake(address indexed account, uint256[] tokenIds);

    constructor(IERC721 _nftCollection, IMintableERC20 _rewardToken) 
        NftStakeVaultV2(_nftCollection, _rewardToken) {
    }

    function _sendRewards(address destination, uint256 amount) internal override {
        IMintableERC20(address(rewardToken)).mint(destination, amount);
    }

    function batchStake(uint256 poolId, uint256[] calldata tokenIds) external whenPoolOpened(poolId) nonReentrant {
        address account = _msgSender();

        for (uint256 i = 0; i < tokenIds.length; i++) {
            _stake(account, poolId, tokenIds[i]);
        }

        emit BatchStake(account, poolId, tokenIds);
    }

    function batchUnstake(uint256[] calldata tokenIds) external nonReentrant {
        address account = _msgSender();

        uint256 rewards = 0;
        for (uint256 i = 0; i < tokenIds.length; i++) {
            require(_deposits[tokenIds[i]].owner == account, "Stake: Not owner of token");
            rewards = rewards + _unstake(account, tokenIds[i]);
        }
        _sendAndUpdateRewards(account, rewards);

        emit BatchUnstake(account, tokenIds);
    }

    function batchRestake(uint256 poolId, uint256[] calldata tokenIds) external nonReentrant {
        address account = _msgSender();

        uint256 rewards = 0;
        for (uint256 i = 0; i < tokenIds.length; i++) {
            require(_deposits[tokenIds[i]].owner == account, "Stake: Not owner of token");
            rewards = rewards + _restake(poolId, tokenIds[i]);
        }
        _sendAndUpdateRewards(account, rewards);

        emit BatchUnstake(account, tokenIds);
        emit BatchStake(account, poolId, tokenIds);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

interface IMintableERC20 is IERC20 {
    function mint(address destination, uint256 amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;
pragma abicoder v2;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@minting-station/contracts/contracts/libraries/Poolable.sol";
import "@minting-station/contracts/contracts/libraries/Recoverable.sol";

/** @title NftStakeVaultV2
 */
contract NftStakeVaultV2 is Ownable, Poolable, Recoverable, ReentrancyGuard, ERC721Holder {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    struct PoolDeposit {
        uint256 depositDate;
        uint256 pool;
        address owner;
    }

    IERC721 public nftCollection;
    IERC20 public rewardToken;

    // poolDeposit per tokenId
    mapping(uint256 => PoolDeposit) _deposits;
    // owner to tokenId mapping
    mapping(address => uint256[]) _userTokens;
    // user rewards mapping
    mapping(address => uint256) _userRewards;

    event Stake(address indexed account, uint256 poolId, uint256 tokenId);
    event Unstake(address indexed account, uint256 tokenId);

    constructor(IERC721 _nftCollection, IERC20 _rewardToken) {
        nftCollection = _nftCollection;
        rewardToken = _rewardToken;
    }

    function _popToken(address account, uint256 tokenId) private {
        uint256 delta = 0;
        uint256 token;
        for (uint256 i = 0; i < _userTokens[account].length; i++) {
            token = _userTokens[account][i];
            if (token == tokenId) {
                delta = delta + 1;
            }
            else {
                _userTokens[account][i - delta] = token;
            }
        }
        for (uint256 i = 0; i < delta; i++) {
            _userTokens[account].pop();
        }
    }

    function _sendRewards(address destination, uint256 amount) internal virtual {
        rewardToken.safeTransfer(destination, amount);
    }

    function _sendAndUpdateRewards(address account, uint256 amount) internal {
        if (amount > 0) {
            _sendRewards(account, amount);
            _userRewards[account] = _userRewards[account].add(amount);
        }
    }

    function _stake(address account, uint256 poolId, uint256 tokenId) internal {
        // transfer token
        nftCollection.safeTransferFrom(account, address(this), tokenId);

        // add deposit
        _deposits[tokenId] = PoolDeposit({depositDate: block.timestamp, pool: poolId, owner: account});
        _userTokens[account].push(tokenId);
    }

    /**
     * @notice Stake a token from the collection
     */
    function stake(uint256 poolId, uint256 tokenId) external whenPoolOpened(poolId) nonReentrant {
        address account = _msgSender();
        _stake(account, poolId, tokenId);
        emit Stake(account, poolId, tokenId);
    }

    function _unstake(address account, uint256 tokenId) internal returns (uint256) {
        uint256 poolId = _deposits[tokenId].pool;
        require(isUnlockable(poolId, _deposits[tokenId].depositDate), "Stake: Not yet unstakable");
        bool unlocked = isUnlocked(poolId, _deposits[tokenId].depositDate);

        // transfer token
        nftCollection.safeTransferFrom(address(this), account, tokenId);

        // update deposit
        _popToken(account, tokenId);
        delete _deposits[tokenId];

        uint256 rewards = 0;
        if (unlocked) {
            Pool memory pool = getPool(poolId);
            rewards = pool.rewardAmount;
        }

        return rewards;
    }

    /**
     * @notice Unstake a token
     */
    function unstake(uint256 tokenId) external nonReentrant {
        require(_deposits[tokenId].owner == _msgSender(), "Stake: Not owner of token");

        address account = _msgSender();
        uint256 rewards = _unstake(account, tokenId);
        _sendAndUpdateRewards(account, rewards);

        emit Unstake(account, tokenId);
    }

    function _restake(uint256 newPoolId, uint256 tokenId) internal returns (uint256) {
        require(isPoolOpened(newPoolId), "Stake: Pool is closed");

        uint256 oldPoolId = _deposits[tokenId].pool;
        require(isUnlockable(oldPoolId, _deposits[tokenId].depositDate), "Stake: Not yet unstakable");
        bool unlocked = isUnlocked(oldPoolId, _deposits[tokenId].depositDate);

        // update deposit
        _deposits[tokenId].pool = newPoolId;
        _deposits[tokenId].depositDate = block.timestamp;

        uint256 rewards = 0;
        if (unlocked) {
            Pool memory pool = getPool(oldPoolId);
            rewards = pool.rewardAmount;
        }

        return rewards;
    }

    /**
     * @notice Allow a user to [re]stake a token in a new pool without unstaking it first.
     */
    function restake(uint256 newPoolId, uint256 tokenId) external nonReentrant {
        require(_deposits[tokenId].owner == _msgSender(), "Stake: Not owner of token");

        address account = _msgSender();
        uint256 rewards = _restake(newPoolId, tokenId);
        _sendAndUpdateRewards(account, rewards);

        emit Unstake(account, tokenId);
        emit Stake(account, newPoolId, tokenId);
    }

    /**
     * @notice Checks if a token has been deposited for enough time to get rewards
     */
    function isTokenUnlocked(uint256 tokenId) public view returns (bool) {
        require(_deposits[tokenId].owner != address(0), "Stake: Token not staked");
        return isUnlocked(_deposits[tokenId].pool, _deposits[tokenId].depositDate);
    }

    /**
     * @notice Get the stake detail for a token (owner, poolId, min unstakable date, reward unlock date)
     */
    function getStakeInfo(uint256 tokenId)
        external
        view
        returns (
            address, // owner
            uint256, // poolId
            uint256, // unlock date
            uint256  // reward date
        )
    {
        require(_deposits[tokenId].owner != address(0), "Stake: Token not staked");
        PoolDeposit memory deposit = _deposits[tokenId];
        Pool memory pool = getPool(deposit.pool);
        return (deposit.owner, deposit.pool, deposit.depositDate + pool.minDuration, deposit.depositDate + pool.lockDuration);
    }

    /**
     * @notice Get the number of tokens staked by a user
     */
    function getUserStakedTokensCount(address account) external view returns (uint256) {
        return _userTokens[account].length;
    }

    /**
     * @notice Get the list of tokens staked by a user
     */
    function getUserStakedTokens(
        address account,
        uint256 size,
        uint256 cursor
    ) external view returns (uint256[] memory, uint256) {
        uint256 length = size;
        if (length > _userTokens[account].length - cursor) {
            length = _userTokens[account].length - cursor;
        }

        uint256[] memory values = new uint256[](length);
        for (uint256 i = 0; i < length; i++) {
            values[i] = _userTokens[account][cursor + i];
        }

        return (values, cursor + length);
    }

    /**
     * @notice Returns the total reward for a user
     */
    function getUserTotalRewards(address account) external view returns (uint256) {
        return _userRewards[account];
    }

    function recoverNonFungibleToken(address _token, uint256 _tokenId) external override onlyOwner {
        // staked collection cannot be recovered by admin
        require(_token != address(nftCollection), "Stake: Cannot recover staked collection");
        IERC721(_token).transferFrom(address(this), address(msg.sender), _tokenId);
        emit NonFungibleTokenRecovery(_token, _tokenId);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^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
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/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 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 {
        _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 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/utils/ERC721Holder.sol)

pragma solidity ^0.8.0;

import "../IERC721Receiver.sol";

/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
 */
contract ERC721Holder is IERC721Receiver {
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.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 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));
        }
    }

    /**
     * @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 v4.4.1 (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
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) {
        unchecked {
            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) {
        unchecked {
            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) {
        unchecked {
            // 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) {
        unchecked {
            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) {
        unchecked {
            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) {
        return a + b;
    }

    /**
     * @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) {
        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) {
        return a * b;
    }

    /**
     * @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.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        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) {
        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) {
        unchecked {
            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.
     *
     * 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) {
        unchecked {
            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) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @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 ReentrancyGuard {
    // 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;

    constructor() {
        _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 making 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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;
pragma abicoder v2;

import "@openzeppelin/contracts/access/Ownable.sol";

/** @title Poolable.
@dev This contract manage configuration of pools
*/
abstract contract Poolable is Ownable {
    struct Pool {
        uint256 lockDuration; // locked timespan
        uint256 minDuration; // min deposit timespan
        bool opened; // flag indicating if the pool is open
        uint256 rewardAmount; // amount rewarded when lockDuration is reached
    }

    // pools mapping
    mapping(uint256 => Pool) private _pools;
    uint256 public poolsLength;

    /**
     * @dev Emitted when a pool is created
     */
    event PoolAdded(uint256 poolIndex, Pool pool);

    /**
     * @dev Emitted when a pool is updated
     */
    event PoolUpdated(uint256 poolIndex, Pool pool);

    /**
     * @dev Modifier that checks that the pool at index `poolIndex` is open
     */
    modifier whenPoolOpened(uint256 poolIndex) {
        require(poolIndex < poolsLength, "Poolable: Invalid poolIndex");
        require(_pools[poolIndex].opened, "Poolable: Pool is closed");
        _;
    }

    /**
     * @dev Modifier that checks that the now() - `depositDate` is above or equal to the min lock duration for pool at index `poolIndex`
     */
    modifier whenUnlocked(uint256 poolIndex, uint256 depositDate) {
        require(
            isUnlocked(poolIndex, depositDate),
            "Poolable: Not unlocked"
        );
        _;
    }

    function getPool(uint256 poolIndex) public view returns (Pool memory) {
        require(poolIndex < poolsLength, "Poolable: Invalid poolIndex");
        return _pools[poolIndex];
    }

    function addPool(Pool calldata pool) external onlyOwner {
        uint256 poolIndex = poolsLength;

        _pools[poolIndex] = pool;
        poolsLength = poolsLength + 1;

        emit PoolAdded(poolIndex, _pools[poolIndex]);
    }

    function updatePool(uint256 poolIndex, Pool calldata pool)
        external
        onlyOwner
    {
        require(poolIndex < poolsLength, "Poolable: Invalid poolIndex");
        Pool storage editedPool = _pools[poolIndex];

        editedPool.lockDuration = pool.lockDuration;
        editedPool.minDuration = pool.minDuration;
        editedPool.opened = pool.opened;
        editedPool.rewardAmount = pool.rewardAmount;

        emit PoolUpdated(poolIndex, editedPool);
    }

    function isUnlocked(uint256 poolIndex, uint256 depositDate) internal view returns (bool) {
        require(poolIndex < poolsLength, "Poolable: Invalid poolIndex");
        require(
            depositDate < block.timestamp,
            "Poolable: Invalid deposit date"
        );
        return block.timestamp - depositDate >= _pools[poolIndex].lockDuration;
    }

    function isUnlockable(uint256 poolIndex, uint256 depositDate) internal view returns (bool) {
        require(poolIndex < poolsLength, "Poolable: Invalid poolIndex");
        require(
            depositDate < block.timestamp,
            "Poolable: Invalid deposit date"
        );
        return block.timestamp - depositDate >= _pools[poolIndex].minDuration;
    }

    function isPoolOpened(uint256 poolIndex) public view returns (bool) {
        require(poolIndex < poolsLength, "Poolable: Invalid poolIndex");
        return _pools[poolIndex].opened;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;
pragma abicoder v2;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "../interfaces/IRecoverable.sol";

abstract contract Recoverable is Ownable, IRecoverable {
    using SafeERC20 for IERC20;

    event NonFungibleTokenRecovery(address indexed token, uint256 tokenId);
    event TokenRecovery(address indexed token, uint256 amount);
    event EthRecovery(uint256 amount);

    /**
     * @notice Allows the owner to recover non-fungible tokens sent to the contract by mistake
     * @param _token: NFT token address
     * @param _tokenId: tokenId
     * @dev Callable by owner
     */
    function recoverNonFungibleToken(address _token, uint256 _tokenId) external virtual onlyOwner {
        IERC721(_token).transferFrom(address(this), address(msg.sender), _tokenId);
        emit NonFungibleTokenRecovery(_token, _tokenId);
    }

    /**
     * @notice Allows the owner to recover tokens sent to the contract by mistake
     * @param _token: token address
     * @dev Callable by owner
     */
    function recoverToken(address _token) external virtual onlyOwner {
        uint256 balance = IERC20(_token).balanceOf(address(this));
        require(balance != 0, "Operations: Cannot recover zero balance");

        IERC20(_token).safeTransfer(address(msg.sender), balance);
        emit TokenRecovery(_token, balance);
    }

    function recoverEth(address payable _to) external virtual onlyOwner {
        uint256 balance = address(this).balance;
        _to.transfer(balance);
        emit EthRecovery(balance);
    }
}

// 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
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^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 IERC165 {
    /**
     * @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
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

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

pragma solidity ^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;
        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");

        (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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IRecoverable {
    /**
     * @notice Allows the owner to recover non-fungible tokens sent to the NFT contract by mistake and this contract
     * @param _token: NFT token address
     * @param _tokenId: tokenId
     * @dev Callable by owner
     */
    function recoverNonFungibleToken(address _token, uint256 _tokenId) external;

    /**
     * @notice Allows the owner to recover tokens sent to the NFT contract and this contract by mistake
     * @param _token: token address
     * @dev Callable by owner
     */
    function recoverToken(address _token) external;

    /**
     * @notice Allows the owner to recover ETH sent to the NFT contract ans and contract by mistake
     * @param _to: target address
     * @dev Callable by owner
     */
    function recoverEth(address payable _to) external;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 500
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000345c2fa23160c63218dfaa25d37269f26c85ca4700000000000000000000000024c487fc99f31181ffdc3b7664b7471ee0506518

-----Decoded View---------------
Arg [0] : _nftCollection (address): 0x345C2Fa23160C63218DfAA25D37269F26C85cA47
Arg [1] : _rewardToken (address): 0x24c487fC99f31181FFdC3b7664b7471EE0506518

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000345c2fa23160c63218dfaa25d37269f26c85ca47
Arg [1] : 00000000000000000000000024c487fc99f31181ffdc3b7664b7471ee0506518