pragma solidity 0.6.12;


// 
/**
 * @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);
}

// 
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts 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 mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// 
/**
 * @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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// 
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

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

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

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

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// 
/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// 
/**
 * @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.
 */
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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// import "./INBUNIERC20.sol";
// import "@nomiclabs/buidler/console.sol";
interface IMigratorToChadSwap {
    // Perform LP token migration from legacy UniswapV2 to ChadSwap.
    // Take the current LP token address and return the new LP token address.
    // Migrator should have full access to the caller's LP token.
    // Return the new LP token address.
    //
    // XXX Migrator must have allowance access to UniswapV2 LP tokens.
    // ChadSwap must mint EXACTLY the same amount of ChadSwap LP tokens or
    // else something bad will happen. Traditional UniswapV2 does not
    // do that so be careful!
    function migrate(IERC20 token) external returns (IERC20);
}

interface IStacyVaultRewardsLock {
    function lock(address _holder, uint256 _amount) external; 
    function lockToBlock() external returns (uint256);
}

// Only true Chads can enter Stacy's vault.
contract StacyVault is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    // Info of each user.
    struct UserInfo {
        uint256 amount; // How many  tokens the user has provided.
        uint256 rewardDebt; // Reward debt. See explanation below.
        uint256 lastDepositBlock;
        //
        // We do some fancy math here. Basically, any point in time, the amount of STACYs
        // entitled to a user but is pending to be distributed is:
        //
        //   pending reward = (user.amount * pool.accStacyPerShare) - user.rewardDebt
        //
        // Whenever a user deposits or withdraws  tokens to a pool. Here's what happens:
        //   1. The pool's `accStacyPerShare` (and `lastRewardBlock`) gets updated.
        //   2. User receives the pending reward sent to his/her address.
        //   3. User's `amount` gets updated.
        //   4. User's `rewardDebt` gets updated.
    }

    // Info of each pool.
    struct PoolInfo {
        IERC20 token; // Address of  token contract.
        uint256 allocPoint; // How many allocation points assigned to this pool. STACYs to distribute per block.
        uint256 accStacyPerShare; // Accumulated STACYs per share, times 1e12. See below.
        bool withdrawable; // Is this pool withdrawable?
        mapping(address => mapping(address => uint256)) allowance;
    }

    IERC20 public stacy;
    // Dev address.
    address public devaddr;

    IStacyVaultRewardsLock public rewardsLock;

    // Info of each pool.
    PoolInfo[] public poolInfo;
    // Info of each user that stakes  tokens.
    mapping(uint256 => mapping(address => UserInfo)) public userInfo;
    // Total allocation poitns. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocPoint;

    //// pending rewards awaiting anyone to massUpdate
    uint256 public pendingRewards;

    uint256 public contractStartBlock;
    uint256 public epochCalculationStartBlock;
    uint256 public cumulativeRewardsSinceStart;
    uint256 public rewardsInThisEpoch;
    uint public epoch;

    uint256 public constant PERCENT_LOCK_BONUS_REWARD = 75; // lock 75% of bonus reward

    // Returns fees generated since start of this contract
    function averageFeesPerBlockSinceStart() external view returns (uint averagePerBlock) {
        averagePerBlock = cumulativeRewardsSinceStart.add(rewardsInThisEpoch).div(block.number.sub(contractStartBlock));
    }        

    // Returns averge fees in this epoch
    function averageFeesPerBlockEpoch() external view returns (uint256 averagePerBlock) {
        averagePerBlock = rewardsInThisEpoch.div(block.number.sub(epochCalculationStartBlock));
    }

    // For easy graphing historical epoch rewards
    mapping(uint => uint256) public epochRewards;

    //Starts a new calculation epoch
    // Because averge since start will not be accurate
    function startNewEpoch() public {
        require(epochCalculationStartBlock + 50000 < block.number, "New epoch not ready yet"); // About a week
        epochRewards[epoch] = rewardsInThisEpoch;
        cumulativeRewardsSinceStart = cumulativeRewardsSinceStart.add(rewardsInThisEpoch);
        rewardsInThisEpoch = 0;
        epochCalculationStartBlock = block.number;
        ++epoch;
    }

    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event EmergencyWithdraw(
        address indexed user,
        uint256 indexed pid,
        uint256 amount
    );
    event Approval(address indexed owner, address indexed spender, uint256 _pid, uint256 value);

    constructor(
        IERC20 _stacy,
        IStacyVaultRewardsLock _rewardsLock,
        address _devaddr, 
        address superAdmin
    )
    public
    Ownable() 
    {
        DEV_FEE = 500; // 5% (of the burn %)
        stacy = _stacy;
        rewardsLock = _rewardsLock;
        devaddr = _devaddr;
        contractStartBlock = block.number;
        _superAdmin = superAdmin;
    }

    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }

    // Add a new token pool. Can only be called by the owner. 
    function add(
        uint256 _allocPoint,
        IERC20 _token,
        bool _withUpdate,
        bool _withdrawable
    ) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }

        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            require(poolInfo[pid].token != _token,"Error pool already added");
        }

        totalAllocPoint = totalAllocPoint.add(_allocPoint);

        poolInfo.push(
            PoolInfo({
                token: _token,
                allocPoint: _allocPoint,
                accStacyPerShare: 0,
                withdrawable : _withdrawable
            })
        );
    }

    // Update the given pool's STACYs allocation point. Can only be called by the owner.
    function set(
        uint256 _pid,
        uint256 _allocPoint,
        bool _withUpdate
    ) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        
        totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(
            _allocPoint
        );
        poolInfo[_pid].allocPoint = _allocPoint;
    }

    // Update the given pool's ability to withdraw tokens
    function setPoolWithdrawable(
        uint256 _pid,
        bool _withdrawable
    ) public onlyOwner {
        poolInfo[_pid].withdrawable = _withdrawable;
    }

    function setRewardsLock(IStacyVaultRewardsLock _rewardsLock) public onlyOwner {
        rewardsLock = _rewardsLock;
    }

    // Sets the dev fee for this contract
    // defaults at 5.00%
    uint16 DEV_FEE;
    function setDevFee(uint16 _DEV_FEE) public onlyOwner {
        require(_DEV_FEE <= 1000, 'Dev fee clamped at 10%');
        DEV_FEE = _DEV_FEE;
    }
    uint256 pending_DEV_rewards;


    // View function to see pending STACYs on frontend.
    function pendingStacy(uint256 _pid, address _user)
        public
        view
        returns (uint256)
    {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accStacyPerShare = pool.accStacyPerShare;

        return user.amount.mul(accStacyPerShare).div(1e12).sub(user.rewardDebt);
    }

    // Update reward vairables for all pools. Be careful of gas spending!
    function massUpdatePools() public {
        // console.log("Mass Updating Pools");
        uint256 length = poolInfo.length;
        uint allRewards;
        for (uint256 pid = 0; pid < length; ++pid) {
            allRewards = allRewards.add(updatePool(pid));
        }

        pendingRewards = pendingRewards.sub(allRewards);
    }

    // ----
    // Function that adds pending rewards, called by the STACY token.
    // ----
    uint256 private stacyBalance;
    function addPendingRewards(uint256 _) public {
        uint256 newRewards = stacy.balanceOf(address(this)).sub(stacyBalance);
        
        if (newRewards > 0) {
            stacyBalance = stacy.balanceOf(address(this)); // If there is no change the balance didn't change
            pendingRewards = pendingRewards.add(newRewards);
            rewardsInThisEpoch = rewardsInThisEpoch.add(newRewards);
        }
    }

    // Update reward variables of the given pool to be up-to-date.
    function updatePool(uint256 _pid) internal returns (uint256 stacyRewardWhole) {
        PoolInfo storage pool = poolInfo[_pid];

        uint256 tokenSupply = pool.token.balanceOf(address(this));
        if (tokenSupply == 0) { // avoids division by 0 errors
            return 0;
        }
        stacyRewardWhole = pendingRewards // Multiplies pending rewards by allocation point of this pool and then total allocation
            .mul(pool.allocPoint)        // getting the percent of total pending rewards this pool should get
            .div(totalAllocPoint);       // we can do this because pools are only mass updated
        uint256 stacyRewardFee = stacyRewardWhole.mul(DEV_FEE).div(10000);
        uint256 stacyRewardToDistribute = stacyRewardWhole.sub(stacyRewardFee);

        pending_DEV_rewards = pending_DEV_rewards.add(stacyRewardFee);

        pool.accStacyPerShare = pool.accStacyPerShare.add(
            stacyRewardToDistribute.mul(1e12).div(tokenSupply)
        );
    }

    function deposit(uint256 _pid, uint256 _amount) public {

        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];

        massUpdatePools();
        
        // Transfer pending tokens
        // to user
        updateAndPayOutPending(_pid, msg.sender);

        // Transfer in the amounts from user
        // save gas
        if (_amount > 0) {
            pool.token.safeTransferFrom(address(msg.sender), address(this), _amount);
            user.amount = user.amount.add(_amount);
        }


        user.rewardDebt = user.amount.mul(pool.accStacyPerShare).div(1e12);
        user.lastDepositBlock = block.number;
        emit Deposit(msg.sender, _pid, _amount);
    }

    // Test coverage
    // [x] Does user get the deposited amounts?
    // [x] Does user that its deposited for update correcty?
    // [x] Does the depositor get their tokens decreased
    function depositFor(address depositForAddress, uint256 _pid, uint256 _amount) public {
        // requires no allowances
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][depositForAddress];

        massUpdatePools();
        
        // Transfer pending tokens
        // to user
        updateAndPayOutPending(_pid, depositForAddress); // Update the balances of person that amount is being deposited for

        if(_amount > 0) {
            pool.token.safeTransferFrom(address(msg.sender), address(this), _amount);
            user.amount = user.amount.add(_amount); // This is depositedFor address
        }

        user.rewardDebt = user.amount.mul(pool.accStacyPerShare).div(1e12); /// This is deposited for address
        emit Deposit(depositForAddress, _pid, _amount);

    }

    // Test coverage
    // [x] Does allowance update correctly?
    function setAllowanceForPoolToken(address spender, uint256 _pid, uint256 value) public {
        PoolInfo storage pool = poolInfo[_pid];
        pool.allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, _pid, value);
    }

    // Test coverage
    // [x] Does allowance decrease?
    // [x] Do oyu need allowance
    // [x] Withdraws to correct address
    function withdrawFrom(address owner, uint256 _pid, uint256 _amount) public{
        PoolInfo storage pool = poolInfo[_pid];
        require(pool.allowance[owner][msg.sender] >= _amount, "withdraw: insufficient allowance");
        pool.allowance[owner][msg.sender] = pool.allowance[owner][msg.sender].sub(_amount);
        _withdraw(_pid, _amount, owner, msg.sender);
    }

    function withdraw(uint256 _pid, uint256 _amount) public {
        _withdraw(_pid, _amount, msg.sender, msg.sender);
    }

    // Low level withdraw function
    function _withdraw(uint256 _pid, uint256 _amount, address from, address to) internal {
        PoolInfo storage pool = poolInfo[_pid];
        require(pool.withdrawable, "Withdrawing from this pool is disabled");
        UserInfo storage user = userInfo[_pid][from];
        require(user.amount >= _amount, "withdraw: not good");
        require(block.number > user.lastDepositBlock, "withdraw: same block as deposit");

        massUpdatePools();
        updateAndPayOutPending(_pid, from); // Update balances of from this is not withdrawal but claiming STACY farmed

        if (_amount > 0) {
            user.amount = user.amount.sub(_amount);
            pool.token.safeTransfer(address(to), _amount);
        }
        user.rewardDebt = user.amount.mul(pool.accStacyPerShare).div(1e12);

        emit Withdraw(to, _pid, _amount);
    }

    // Withdraw without caring about rewards. EMERGENCY ONLY.
    // !Caution this will remove all your pending rewards!
    function emergencyWithdraw(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        require(pool.withdrawable, "Withdrawing from this pool is disabled");
        UserInfo storage user = userInfo[_pid][msg.sender];
        pool.token.safeTransfer(address(msg.sender), user.amount);
        emit EmergencyWithdraw(msg.sender, _pid, user.amount);
        user.amount = 0;
        user.rewardDebt = 0;
        // No mass update dont update pending rewards
    }    

    function updateAndPayOutPending(uint256 _pid, address _addr) internal {
        uint256 pending = pendingStacy(_pid, _addr);

        if (pending > 0) {
            uint256 stacyBal = stacy.balanceOf(address(this));
            uint256 availableAmountToTransfer = pending > stacyBal ? stacyBal : pending;

            // if (block.number < rewardsLock.lockToBlock()) {}

            uint256 lockAmount = availableAmountToTransfer.mul(PERCENT_LOCK_BONUS_REWARD).div(100);

            // Transfer 25% immediately
            stacy.transfer(_addr, availableAmountToTransfer.sub(lockAmount));

            // Lock the remaining 75% in the vault rewards lock contract
            stacy.safeApprove(address(rewardsLock), lockAmount);
            // console.log("lockAmount", lockAmount, "amountTransferred", availableAmountToTransfer);
            rewardsLock.lock(_addr, lockAmount);
            stacy.safeApprove(address(rewardsLock), 0);

            // Book keeping
            stacyBalance = stacy.balanceOf(address(this));

            transferDevFee();
        }
    }

    // function that lets owner/governance contract
    // approve allowance for any token inside this contract
    // This means all future UNI like airdrops are covered
    // And at the same time allows us to give allowance to strategy contracts.
    // Upcoming cYFI etc vaults strategy contracts will  se this function to manage and farm yield on value locked
    function setStrategyContractOrDistributionContractAllowance(address tokenAddress, uint256 _amount, address contractAddress) public onlySuperAdmin {
        require(isContract(contractAddress), "Recipent is not a smart contract, BAD");
        require(block.number > contractStartBlock.add(95_000), "Governance setup grace period not over"); // about 2weeks
        IERC20(tokenAddress).approve(contractAddress, _amount);
    }

    function isContract(address addr) public returns (bool) {
        uint size;
        assembly { size := extcodesize(addr) }
        return size > 0;
    }

    // Safe stacy transfer function, just in case if rounding error causes pool to not have enough STACYs.
    function safeStacyTransfer(address _to, uint256 _amount) internal returns (uint256 amountToTransfer) {
        uint256 stacyBal = stacy.balanceOf(address(this));

        amountToTransfer = _amount > stacyBal ? stacyBal : _amount;
        stacy.transfer(_to, amountToTransfer);
        stacyBalance = stacy.balanceOf(address(this));

        transferDevFee();

        return amountToTransfer;
    }

    function transferDevFee() public {
        if (pending_DEV_rewards == 0) {
            return;
        }

        uint256 stacyBal = stacy.balanceOf(address(this));
        if (pending_DEV_rewards > stacyBal) {
            stacy.transfer(devaddr, stacyBal);
            stacyBalance = stacy.balanceOf(address(this));
        } else {
            stacy.transfer(devaddr, pending_DEV_rewards);
            stacyBalance = stacy.balanceOf(address(this));
        }

        pending_DEV_rewards = 0;
    }

    // Update dev address by the previous dev.
    // Note onlyOwner functions are meant for the governance contract
    function setDevFeeReciever(address _devaddr) public onlyOwner {
        devaddr = _devaddr;
    }

    address private _superAdmin;

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

    /**
     * @dev Returns the address of the current super admin
     */
    function superAdmin() public view returns (address) {
        return _superAdmin;
    }

    /**
     * @dev Throws if called by any account other than the superAdmin
     */
    modifier onlySuperAdmin() {
        require(_superAdmin == _msgSender(), "Super admin : caller is not super admin.");
        _;
    }

    // Assisns super admint to address 0, making it unreachable forever
    function burnSuperAdmin() public virtual onlySuperAdmin {
        emit SuperAdminTransfered(_superAdmin, address(0));
        _superAdmin = address(0);
    }

    // Super admin can transfer its powers to another address
    function newSuperAdmin(address newOwner) public virtual onlySuperAdmin {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit SuperAdminTransfered(_superAdmin, newOwner);
        _superAdmin = newOwner;
    }

    // ChadSwap hooks

    IMigratorToChadSwap public migrator;

    function setMigrator(IMigratorToChadSwap _migrator) public onlyOwner {
        migrator = _migrator;
    }

    function migrate(uint256 _pid) public {
        require(address(migrator) != address(0), "migrate: no migrator");
        PoolInfo storage pool = poolInfo[_pid];
        IERC20 lpToken = pool.token;
        uint256 bal = lpToken.balanceOf(address(this));
        lpToken.safeApprove(address(migrator), bal);
        IERC20 newLpToken = migrator.migrate(lpToken);
        require(bal == newLpToken.balanceOf(address(this)), "migrate: bad");
        pool.token = newLpToken;
    }
}

{
  "compilationTarget": {
    "StacyVault.sol": "StacyVault"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}