// File: contracts/farm/MagicTreasureStaking.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/security/ReentrancyGuard.sol';
import '@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol';
import '@openzeppelin/contracts/token/ERC721/IERC721.sol';
import '@solidstate/contracts/utils/EnumerableSet.sol';

contract MagicTreasureStaking is Ownable, ReentrancyGuard, IERC721Receiver {
    using EnumerableSet for EnumerableSet.UintSet;

    //Total deposit balance
    mapping(address => uint256) public depositBalances;
    //ERC721 deposits 
    mapping(address => EnumerableSet.UintSet) private _deposits;

    IERC20 public stakedToken;
    address public ERC721_CONTRACT;

    uint256 public totalSupply;

    event StakedTreasure(address indexed user, uint256[] tokenIds);
    event Staked(address indexed user, uint256 amount, uint256 timeStamp);

    function balanceOf(address account) public view returns (uint256) {
        return depositBalances[account];
    }

    function totalStaked() public view returns (uint256) {
        return stakedToken.balanceOf(address(this));
    }

    string constant _transferErrorMessage = 'staked token transfer failed';

    constructor(IERC20 _stakedToken, address _treasureContract) {
        stakedToken = _stakedToken;
        ERC721_CONTRACT = _treasureContract;
    }

    function stakeFor(address forWhom, uint256 amount) public payable {
        IERC20 st = stakedToken;

        if (st == IERC20(address(0))) {
            unchecked {
                totalSupply += msg.value;
                depositBalances[forWhom] += msg.value;
            }
        } else {
            require(msg.value == 0, 'non-zero eth');
            require(amount > 0, 'Cannot stake 0');
            require(
                st.transferFrom(msg.sender, address(this), amount),
                _transferErrorMessage
            );
            unchecked {
                totalSupply += amount;
                depositBalances[forWhom] += amount;
            }
        }
        emit Staked(forWhom, amount, uint256(block.timestamp));
    }

    function stake(uint256 amount) external payable {
        require(msg.sender == tx.origin, 'humans only please.');
        stakeFor(msg.sender, amount);
    }

    function stakeTreasure(uint256[] calldata _tokenIds) external {
        for (uint256 i; i < _tokenIds.length; i++) {
            IERC721(ERC721_CONTRACT).safeTransferFrom(
                msg.sender,
                address(this),
                _tokenIds[i],
                ''
            );

            _deposits[msg.sender].add(_tokenIds[i]);
        }
        emit StakedTreasure(msg.sender, _tokenIds);
    }

    function onERC721Received(
        address,
        address,
        uint256,
        bytes calldata
    ) external pure override returns (bytes4) {
        return IERC721Receiver.onERC721Received.selector;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

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() {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT

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);
}

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT

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 make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol



// SPDX-License-Identifier: MIT

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);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT

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;
}

// File: @solidstate/contracts/utils/EnumerableSet.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title Set implementation with enumeration functions
 * @dev derived from https://github.com/OpenZeppelin/openzeppelin-contracts (MIT license)
 */
library EnumerableSet {
  struct Set {
    bytes32[] _values;
    // 1-indexed to allow 0 to signify nonexistence
    mapping (bytes32 => uint) _indexes;
  }

  struct Bytes32Set {
    Set _inner;
  }

  struct AddressSet {
    Set _inner;
  }

  struct UintSet {
    Set _inner;
  }

  function at (
    Bytes32Set storage set,
    uint index
  ) internal view returns (bytes32) {
    return _at(set._inner, index);
  }

  function at (
    AddressSet storage set,
    uint index
  ) internal view returns (address) {
    return address(uint160(uint(_at(set._inner, index))));
  }

  function at (
    UintSet storage set,
    uint index
  ) internal view returns (uint) {
    return uint(_at(set._inner, index));
  }

  function contains (
    Bytes32Set storage set,
    bytes32 value
  ) internal view returns (bool) {
    return _contains(set._inner, value);
  }

  function contains (
    AddressSet storage set,
    address value
  ) internal view returns (bool) {
    return _contains(set._inner, bytes32(uint(uint160(value))));
  }

  function contains (
    UintSet storage set,
    uint value
  ) internal view returns (bool) {
    return _contains(set._inner, bytes32(value));
  }

  function indexOf (
    Bytes32Set storage set,
    bytes32 value
  ) internal view returns (uint) {
    return _indexOf(set._inner, value);
  }

  function indexOf (
    AddressSet storage set,
    address value
  ) internal view returns (uint) {
    return _indexOf(set._inner, bytes32(uint(uint160(value))));
  }

  function indexOf (
    UintSet storage set,
    uint value
  ) internal view returns (uint) {
    return _indexOf(set._inner, bytes32(value));
  }

  function length (
    Bytes32Set storage set
  ) internal view returns (uint) {
    return _length(set._inner);
  }

  function length (
    AddressSet storage set
  ) internal view returns (uint) {
    return _length(set._inner);
  }

  function length (
    UintSet storage set
  ) internal view returns (uint) {
    return _length(set._inner);
  }

  function add (
    Bytes32Set storage set,
    bytes32 value
  ) internal returns (bool) {
    return _add(set._inner, value);
  }

  function add (
    AddressSet storage set,
    address value
  ) internal returns (bool) {
    return _add(set._inner, bytes32(uint(uint160(value))));
  }

  function add (
    UintSet storage set,
    uint value
  ) internal returns (bool) {
    return _add(set._inner, bytes32(value));
  }

  function remove (
    Bytes32Set storage set,
    bytes32 value
  ) internal returns (bool) {
    return _remove(set._inner, value);
  }

  function remove (
    AddressSet storage set,
    address value
  ) internal returns (bool) {
    return _remove(set._inner, bytes32(uint(uint160(value))));
  }

  function remove (
    UintSet storage set,
    uint value
  ) internal returns (bool) {
    return _remove(set._inner, bytes32(value));
  }

  function _at (
    Set storage set,
    uint index
  ) private view returns (bytes32) {
    require(set._values.length > index, 'EnumerableSet: index out of bounds');
    return set._values[index];
  }

  function _contains (
    Set storage set,
    bytes32 value
  ) private view returns (bool) {
    return set._indexes[value] != 0;
  }

  function _indexOf (
    Set storage set,
    bytes32 value
  ) private view returns (uint) {
    unchecked {
      return set._indexes[value] - 1;
    }
  }

  function _length (
    Set storage set
  ) private view returns (uint) {
    return set._values.length;
  }

  function _add (
    Set storage set,
    bytes32 value
  ) private returns (bool) {
    if (!_contains(set, value)) {
      set._values.push(value);
      set._indexes[value] = set._values.length;
      return true;
    } else {
      return false;
    }
  }

  function _remove (
    Set storage set,
    bytes32 value
  ) private returns (bool) {
    uint valueIndex = set._indexes[value];

    if (valueIndex != 0) {
      uint index = valueIndex - 1;
      bytes32 last = set._values[set._values.length - 1];

      // move last value to now-vacant index

      set._values[index] = last;
      set._indexes[last] = index + 1;

      // clear last index

      set._values.pop();
      delete set._indexes[value];

      return true;
    } else {
      return false;
    }
  }
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT

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;
    }
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol



// SPDX-License-Identifier: MIT

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);
}