// File: @openzeppelin\contracts\token\ERC721\IERC721Receiver.sol

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (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);
}

// File: node_modules\@openzeppelin\contracts\utils\introspection\IERC165.sol

// OpenZeppelin Contracts v4.4.0 (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);
}

// File: @openzeppelin\contracts\token\ERC721\IERC721.sol

// OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;


/**
 * @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: node_modules\@openzeppelin\contracts\utils\Context.sol

// OpenZeppelin Contracts v4.4.0 (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;
    }
}

// File: @openzeppelin\contracts\access\Ownable.sol

// OpenZeppelin Contracts v4.4.0 (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @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);
    }
}

// File: @openzeppelin\contracts\utils\math\SafeMath.sol

// OpenZeppelin Contracts v4.4.0 (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;
        }
    }
}

// File: contracts\lib\IMintableERC20.sol

// OpenZeppelin Contracts v4.4.0 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IMintableERC20 {
    function mint(address to, uint256 amount) external;
    /**
     * @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: contracts\consoleStake.sol


pragma solidity ^0.8.0;






contract ConsoleStake is IERC721Receiver, Ownable {
  using SafeMath for uint256;

  uint256 constant SECINDAY = 86400;
  
  IMintableERC20 public gameToken;
  IERC721 public consoleToken;

  // struct to store a stake's token, owner, and earning values
  struct Stake {
    uint256 lastClaim;
    address owner;
  }

  // maps tokenId to stake
  mapping(uint256 => Stake) public stakes; 

  event TokenStaked(address owner, uint256 tokenId);
  event TokenUnStaked(address owner, uint256 tokenId);
  event GameClaimed(uint256 tokenId, uint256 earned);
  
  constructor(IMintableERC20 _gameToken, IERC721 _consoleToken) { 
    gameToken = _gameToken;
    consoleToken = _consoleToken;
  }

  function stakeConsoles(uint16[] calldata tokenIds) external {
    for (uint i = 0; i < tokenIds.length; i++) {
      require(consoleToken.ownerOf(tokenIds[i]) == _msgSender(), "not_token_owner");
      consoleToken.transferFrom(_msgSender(), address(this), tokenIds[i]);
      _stakeConsole(_msgSender(), tokenIds[i]);
    }
  }

  function unstakeConsoles(uint16[] calldata tokenIds) external {
    for (uint i = 0; i < tokenIds.length; i++) { 
      require(stakes[tokenIds[i]].owner == _msgSender(), "not_token_owner");
      consoleToken.transferFrom(address(this), _msgSender(), tokenIds[i]);
      _unstakeConsole(_msgSender(), tokenIds[i]);
    }
  }

  function claim(uint16[] calldata tokenIds) external {
    uint256 amount = 0;
    for (uint i = 0; i < tokenIds.length; i++) {
      require(stakes[tokenIds[i]].owner == _msgSender(), "not_token_owner");
      amount = amount.add(_claim(tokenIds[i]));
    }

    // transfer Game token reward
    if (amount > 0) {
      gameToken.mint(msg.sender, amount * 10 ** 18);
    }
  }

  function onERC721Received(
    address,
    address from,
    uint256,
    bytes calldata
  ) external pure override returns (bytes4) {
    require(from == address(0x0), "Cannot send tokens to Barn directly");
    return IERC721Receiver.onERC721Received.selector;
  }

  function _stakeConsole(address account, uint256 tokenId) internal {
    stakes[tokenId] = Stake({
      lastClaim: block.timestamp,
      owner: account
    });
    emit TokenStaked(account, tokenId);
  }

  function _unstakeConsole(address account, uint256 tokenId) internal {
    delete stakes[tokenId];
    emit TokenUnStaked(account, tokenId);
  }

  /**
    update last claim time for stake, returns amount of Game token be rewarded
   */
  function _claim(uint16 tokenId) internal returns (uint256){
    Stake storage stake = stakes[tokenId];
    uint256 amount = block.timestamp.sub(stake.lastClaim).div(SECINDAY);
    if (amount > 0) {
      stake.lastClaim = stake.lastClaim.add(amount.mul(SECINDAY));
      emit GameClaimed(tokenId, amount);
    }
    return amount;
  }
}

// File: contracts\ConsoleStakeV2.sol


pragma solidity ^0.8.0;







contract ConsoleStakeV2 is Ownable {
  using SafeMath for uint256;

  uint256 constant SECINDAY = 86400;
  uint256 constant DECADE_PERIOD = 50; // IN DAYS
  uint256 constant INIT_TIME = 1639584000; // GAME TOKEN DEPLOYMENT TIMESTAMP Wed Dec 15 2021 16:00:00 GMT+0000
  uint256 constant LPREWARD_SEC = 0.003472 ether; // GAME EMISSION RATE FOR LP STAKING IN A SEC => 300 GAME PER DAY

  IMintableERC20 public gameToken;
  ConsoleStake public oldStake;

  IMintableERC20 public LPToken; // game-eth or game-frax
  uint256 public lastLPRewardTime;  // Last block timestamp that Games distribution occurs.
  uint256 public accGAMEPerShare;   // Accumulated Games per share, times 1e12. See below.

  // struct to store a stake's token, owner, and earning values
  struct Stake {
    uint256 lastClaim;
    address owner;
  }

  struct UserInfo {
    uint256 amount;         // How many LP tokens the user has provided.
    uint256 rewardDebt;     // Reward debt.
  }

  event DepositLP(address indexed user, uint256 amount);
  event WithdrawLP(address indexed user, uint256 amount);
  event EmergencyWithdrawLP(address indexed user, uint256 amount);

  // maps tokenId to stake
  mapping(uint256 => Stake) public stakes; 
  mapping(address => UserInfo) public userInfo;

  constructor(IMintableERC20 _gameToken, IMintableERC20 _lpToken, ConsoleStake _oldStake) { 
    gameToken = _gameToken;
    LPToken = _lpToken;
    oldStake = _oldStake;
  }

  // Return reward multiplier over the given _from to _to block.
  function getMultiplier(uint256 _from, uint256 _to) public pure returns (uint256) {
    return _to.sub(_from);
  }

  // View function to see pending AMCs on frontend.
  function pendingGAME(address _user) external view returns (uint256) {
    UserInfo storage user = userInfo[_user];
    uint256 lpSupply = LPToken.balanceOf(address(this));
    uint256 _accGAMEPerShare = accGAMEPerShare;
    if (block.timestamp > lastLPRewardTime && lpSupply != 0) {
        uint256 multiplier = getMultiplier(lastLPRewardTime, block.timestamp);
        uint256 gameReward = multiplier.mul(emissionRateLPReward());
        _accGAMEPerShare = _accGAMEPerShare.add(gameReward.mul(1e12).div(lpSupply));
    }
    return user.amount.mul(_accGAMEPerShare).div(1e12).sub(user.rewardDebt);
  }

  // Update reward variables of the given pool to be up-to-date.
  function updatePool() public {
    if (block.timestamp <= lastLPRewardTime) {
        return;
    }
    uint256 lpSupply = LPToken.balanceOf(address(this));
    if (lpSupply == 0) {
        lastLPRewardTime = block.timestamp;
        return;
    }
    uint256 multiplier = getMultiplier(lastLPRewardTime, block.timestamp);
    uint256 gameReward = multiplier.mul(emissionRateLPReward());
    gameToken.mint(address(this), gameReward);
    accGAMEPerShare = accGAMEPerShare.add(gameReward.mul(1e12).div(lpSupply));
    lastLPRewardTime = block.timestamp;
  }

  // Withdraw without caring about rewards. EMERGENCY ONLY.
  function emergencyWithdraw() public  {
    UserInfo storage user = userInfo[msg.sender];
    uint256 amount = user.amount;
    user.amount = 0;
    user.rewardDebt = 0;
    LPToken.transfer(address(msg.sender), amount);
    emit EmergencyWithdrawLP(msg.sender, amount);
  }

  function enterStaking(uint256 _amount) public {
    UserInfo storage user = userInfo[msg.sender];
    updatePool();
    if (user.amount > 0) {
        uint256 pending = user.amount.mul(accGAMEPerShare).div(1e12).sub(user.rewardDebt);
        if(pending > 0) {
            gameToken.transfer(msg.sender, pending);
        }
    }
    if(_amount > 0) {
        require(LPToken.transferFrom(address(msg.sender), address(this), _amount));
        user.amount = user.amount.add(_amount);
    }
    user.rewardDebt = user.amount.mul(accGAMEPerShare).div(1e12);
    emit DepositLP(msg.sender, _amount);
  }

  function leaveStaking(uint256 _amount) public {
    UserInfo storage user = userInfo[msg.sender];
    require(user.amount >= _amount, "withdraw: not good");
    updatePool();
    uint256 pending = user.amount.mul(accGAMEPerShare).div(1e12).sub(user.rewardDebt);
    if(pending > 0) {
        gameToken.transfer(msg.sender, pending);
    }
    if(_amount > 0) {
        user.amount = user.amount.sub(_amount);
        LPToken.transfer(address(msg.sender), _amount);
    }
    user.rewardDebt = user.amount.mul(accGAMEPerShare).div(1e12);
    emit WithdrawLP(msg.sender, _amount);
  }

  function emissionRate() public view returns (uint256) {
    uint256 periods = block.timestamp.sub(INIT_TIME).div(SECINDAY * DECADE_PERIOD);

    return (10 ** 18) / (2 ** periods) ;
  }

  function emissionRateLPReward() public view returns (uint256) {
    uint256 periods = block.timestamp.sub(INIT_TIME).div(SECINDAY * DECADE_PERIOD);

    return LPREWARD_SEC / (2 ** periods) ;
  }

  function calcReward(uint256 _tokenId) public view returns (uint256, uint256) {
    uint256 rate = emissionRate();
    uint256 lastClaim;
    address creator;
    
    (lastClaim, creator) = oldStake.stakes(_tokenId);
    if (creator == address(0)) return (0, 0);
    Stake storage stake = stakes[_tokenId];
    if (stake.lastClaim > lastClaim) {
      lastClaim = stake.lastClaim;
    }

    uint256 slots = block.timestamp.sub(lastClaim).div(SECINDAY);
    uint256 amount = slots.mul(rate);
    return (amount, slots);
  }

  function claim(uint16[] calldata tokenIds) external {
    uint256 amount = 0;
    for (uint i = 0; i < tokenIds.length; i++) {
      amount = amount.add(_claim(tokenIds[i]));
    }

    // transfer Game token reward
    if (amount > 0) {
      gameToken.mint(msg.sender, amount);
    }
  }

  /**
    update last claim time for stake, returns amount of Game token be rewarded
   */
  function _claim(uint16 _tokenId) internal returns (uint256){
    uint256 lastClaim;
    address creator;
    (lastClaim, creator) = oldStake.stakes(_tokenId);

    require(creator ==  _msgSender(), "not_stake_owner");
    uint256 amount;
    uint256 slots;
    (amount, slots) = calcReward(_tokenId);

    // update stake stroage for next reward
    Stake storage stake = stakes[_tokenId];
    if (stake.lastClaim > lastClaim) {
      stake.lastClaim = stake.lastClaim.add(slots.mul(SECINDAY));
    } else  {
      stake.lastClaim = lastClaim.add(slots.mul(SECINDAY));
    }

    return amount;
  }
}