creation_sourcecode: //SPDX-License-Identifier: UNLICENSED
  
  pragma solidity 0.8.11;
  
  //import "@nomiclabs/buidler/console.sol";
  
  /*
   * @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.
   */
  contract Context {
      // Empty internal constructor, to prevent people from mistakenly deploying
      // an instance of this contract, which should be used via inheritance.
      constructor() {}
  
      function _msgSender() internal view returns (address payable) {
          return payable(msg.sender);
      }
  
      function _msgData() internal view 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() {
          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 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 onlyOwner {
          _transferOwnership(newOwner);
      }
  
      /**
       * @dev Transfers ownership of the contract to a new account (`newOwner`).
       */
      function _transferOwnership(address newOwner) internal {
          require(
              newOwner != address(0),
              "Ownable: new owner is the zero address"
          );
          emit OwnershipTransferred(_owner, newOwner);
          _owner = newOwner;
      }
  }
  
  /**
   * @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;
      }
  
      function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
          z = x < y ? x : y;
      }
  
      // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
      function sqrt(uint256 y) internal pure returns (uint256 z) {
          if (y > 3) {
              z = y;
              uint256 x = y / 2 + 1;
              while (x < z) {
                  z = x;
                  x = (y / x + x) / 2;
              }
          } else if (y != 0) {
              z = 1;
          }
      }
  }
  
  interface IBEP20 {
      /**
       * @dev Returns the amount of tokens in existence.
       */
      function totalSupply() external view returns (uint256);
  
      /**
       * @dev Returns the token decimals.
       */
      function decimals() external view returns (uint8);
  
      /**
       * @dev Returns the token symbol.
       */
      function symbol() external view returns (string memory);
  
      /**
       * @dev Returns the token name.
       */
      function name() external view returns (string memory);
  
      /**
       * @dev Returns the bep token owner.
       */
      function getOwner() external view returns (address);
  
      /**
       * @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
      );
  }
  
  /**
   * @title SafeBEP20
   * @dev Wrappers around BEP20 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 SafeBEP20 for IBEP20;` statement to your contract,
   * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
   */
  library SafeBEP20 {
      using SafeMath for uint256;
      using Address for address;
  
      function safeTransfer(IBEP20 token, address to, uint256 value) internal {
          _callOptionalReturn(
              token,
              abi.encodeWithSelector(token.transfer.selector, to, value)
          );
      }
  
      function safeTransferFrom(
          IBEP20 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
       * {IBEP20-approve}, and its usage is discouraged.
       *
       * Whenever possible, use {safeIncreaseAllowance} and
       * {safeDecreaseAllowance} instead.
       */
      function safeApprove(
          IBEP20 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),
              "SafeBEP20: approve from non-zero to non-zero allowance"
          );
          _callOptionalReturn(
              token,
              abi.encodeWithSelector(token.approve.selector, spender, value)
          );
      }
  
      function safeIncreaseAllowance(
          IBEP20 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(
          IBEP20 token,
          address spender,
          uint256 value
      ) internal {
          uint256 newAllowance = token.allowance(address(this), spender).sub(
              value,
              "SafeBEP20: 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(IBEP20 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,
              "SafeBEP20: low-level call failed"
          );
          if (returndata.length > 0) {
              // Return data is optional
              // solhint-disable-next-line max-line-length
              require(
                  abi.decode(returndata, (bool)),
                  "SafeBEP20: BEP20 operation did not succeed"
              );
          }
      }
  }
  
  /**
   * @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);
              }
          }
      }
  }
  
  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;
      }
  }
  
  contract AiStake is Ownable, ReentrancyGuard {
      using SafeMath for uint256;
      using SafeBEP20 for IBEP20;
  
      // Info of each user.
      struct UserInfo {
          uint256 amount; // How many LP tokens the user has provided.
          uint256 rewardDebt; // Reward debt. See explanation below.
      }
  
      // Info of each pool.
      struct PoolInfo {
          IBEP20 lpToken; // Address of LP token contract.
          uint256 allocPoint; // How many allocation points assigned to this pool. Tokens to distribute per block.
          uint256 lastRewardTimestamp; // Last block number that Tokens distribution occurs.
          uint256 accTokensPerShare; // Accumulated Tokens per share, times 1e12. See below.
      }
  
      IBEP20 public immutable stakingToken;
      IBEP20 public immutable rewardToken;
      mapping(address => uint256) public holderUnlockTime;
  
      uint256 public totalStaked;
      uint256 public apy;
      uint256 public lockDuration;
      uint256 public exitPenaltyPerc;
  
      // Info of each pool.
      PoolInfo[] public poolInfo;
      // Info of each user that stakes LP tokens.
      mapping(address => UserInfo) public userInfo;
      // Total allocation poitns. Must be the sum of all allocation points in all pools.
      uint256 private totalAllocPoint = 0;
  
      event Deposit(address indexed user, uint256 amount);
      event Withdraw(address indexed user, uint256 amount);
      event EmergencyWithdraw(address indexed user, uint256 amount);
  
      constructor() {
          stakingToken = IBEP20(0x1A50FCeB7B6B9019A43E71083Ec17cfb918B0B29);
          rewardToken = stakingToken;
  
          apy = 75;
          lockDuration = 7 days;
          exitPenaltyPerc = 5;
  
          // staking pool
          poolInfo.push(
              PoolInfo({
                  lpToken: stakingToken,
                  allocPoint: 1000,
                  lastRewardTimestamp: 2199615,
                  accTokensPerShare: 0
              })
          );
  
          totalAllocPoint = 1000;
      }
  
      function stopReward() external onlyOwner {
          updatePool(0);
          apy = 0;
      }
  
      function startReward() external onlyOwner {
          require(
              poolInfo[0].lastRewardTimestamp == 21799615,
              "Can only start rewards once"
          );
          poolInfo[0].lastRewardTimestamp = block.timestamp;
      }
  
      // View function to see pending Reward on frontend.
      function pendingReward(address _user) external view returns (uint256) {
          PoolInfo storage pool = poolInfo[0];
          UserInfo storage user = userInfo[_user];
          if (pool.lastRewardTimestamp == 21799615) {
              return 0;
          }
          uint256 accTokensPerShare = pool.accTokensPerShare;
          uint256 lpSupply = totalStaked;
          if (block.timestamp > pool.lastRewardTimestamp && lpSupply != 0) {
              uint256 tokenReward = calculateNewRewards()
                  .mul(pool.allocPoint)
                  .div(totalAllocPoint);
              accTokensPerShare = accTokensPerShare.add(
                  tokenReward.mul(1e12).div(lpSupply)
              );
          }
          return
              user.amount.mul(accTokensPerShare).div(1e12).sub(user.rewardDebt);
      }
  
      // Update reward variables of the given pool to be up-to-date.
      function updatePool(uint256 _pid) internal {
          PoolInfo storage pool = poolInfo[_pid];
          if (block.timestamp <= pool.lastRewardTimestamp) {
              return;
          }
          uint256 lpSupply = totalStaked;
          if (lpSupply == 0) {
              pool.lastRewardTimestamp = block.timestamp;
              return;
          }
          uint256 tokenReward = calculateNewRewards().mul(pool.allocPoint).div(
              totalAllocPoint
          );
          pool.accTokensPerShare = pool.accTokensPerShare.add(
              tokenReward.mul(1e12).div(lpSupply)
          );
          pool.lastRewardTimestamp = block.timestamp;
      }
  
      // Update reward variables for all pools. Be careful of gas spending!
      function massUpdatePools() public onlyOwner {
          uint256 length = poolInfo.length;
          for (uint256 pid = 0; pid < length; ++pid) {
              updatePool(pid);
          }
      }
  
      // Stake primary tokens
      function deposit(uint256 _amount) public nonReentrant {
          if (holderUnlockTime[msg.sender] == 0) {
              holderUnlockTime[msg.sender] = block.timestamp + lockDuration;
          }
          PoolInfo storage pool = poolInfo[0];
          UserInfo storage user = userInfo[msg.sender];
  
          updatePool(0);
          if (user.amount > 0) {
              uint256 pending = user
                  .amount
                  .mul(pool.accTokensPerShare)
                  .div(1e12)
                  .sub(user.rewardDebt);
              if (pending > 0) {
                  require(
                      pending <= rewardsRemaining(),
                      "Cannot withdraw other people's staked tokens.  Contact an admin A."
                  );
                  rewardToken.safeTransfer(address(msg.sender), pending);
              }
          }
          uint256 amountTransferred = 0;
          if (_amount > 0) {
              uint256 initialBalance = pool.lpToken.balanceOf(address(this));
              pool.lpToken.safeTransferFrom(
                  address(msg.sender),
                  address(this),
                  _amount
              );
              amountTransferred =
                  pool.lpToken.balanceOf(address(this)) -
                  initialBalance;
              user.amount = user.amount.add(amountTransferred);
              totalStaked += amountTransferred;
          }
          user.rewardDebt = user.amount.mul(pool.accTokensPerShare).div(1e12);
  
          emit Deposit(msg.sender, _amount);
      }
  
      // Withdraw primary tokens from STAKING.
  
      function withdraw() public nonReentrant {
          require(
              holderUnlockTime[msg.sender] <= block.timestamp,
              "May not do normal withdraw early"
          );
  
          PoolInfo storage pool = poolInfo[0];
          UserInfo storage user = userInfo[msg.sender];
  
          uint256 _amount = user.amount;
          updatePool(0);
          uint256 pending = user.amount.mul(pool.accTokensPerShare).div(1e12).sub(
              user.rewardDebt
          );
          if (pending > 0) {
              require(
                  pending <= rewardsRemaining(),
                  "Cannot withdraw other people's staked tokens.  Contact an admin B."
              );
              rewardToken.safeTransfer(address(msg.sender), pending);
          }
  
          if (_amount > 0) {
              user.amount = 0;
              totalStaked -= _amount;
              pool.lpToken.safeTransfer(address(msg.sender), _amount);
          }
  
          user.rewardDebt = user.amount.mul(pool.accTokensPerShare).div(1e12);
  
          if (user.amount > 0) {
              holderUnlockTime[msg.sender] = block.timestamp + lockDuration;
          } else {
              holderUnlockTime[msg.sender] = 0;
          }
  
          emit Withdraw(msg.sender, _amount);
      }
  
      // Withdraw without caring about rewards. EMERGENCY ONLY.
      function emergencyWithdraw() external nonReentrant {
          PoolInfo storage pool = poolInfo[0];
          UserInfo storage user = userInfo[msg.sender];
          uint256 _amount = user.amount;
          totalStaked -= _amount;
          // exit penalty for early unstakers, penalty held on contract as rewards.
          if (holderUnlockTime[msg.sender] >= block.timestamp) {
              _amount -= (_amount * exitPenaltyPerc) / 100;
          }
          holderUnlockTime[msg.sender] = 0;
          pool.lpToken.safeTransfer(address(msg.sender), _amount);
          user.amount = 0;
          user.rewardDebt = 0;
          emit EmergencyWithdraw(msg.sender, _amount);
      }
  
      // Withdraw reward. EMERGENCY ONLY. This allows the owner to migrate rewards to a new staking pool since we are not minting new tokens.
      function emergencyRewardWithdraw(uint256 _amount) external onlyOwner {
          require(
              _amount <= rewardToken.balanceOf(address(this)) - totalStaked,
              "not enough tokens to take out"
          );
          rewardToken.safeTransfer(address(msg.sender), _amount);
      }
  
      function calculateNewRewards() public view returns (uint256) {
          PoolInfo storage pool = poolInfo[0];
          if (pool.lastRewardTimestamp > block.timestamp) {
              return 0;
          }
          return ((((block.timestamp - pool.lastRewardTimestamp) * totalStaked) *
              apy) /
              100 /
              365 days);
      }
  
      function rewardsRemaining() public view returns (uint256) {
          return rewardToken.balanceOf(address(this)) - totalStaked;
      }
  
      function updateApy(uint256 newApy) external onlyOwner {
          require(newApy <= 10000, "APY must be below 10000%");
          updatePool(0);
          apy = newApy;
      }
  
      function updatelockduration(uint256 newlockDuration) external onlyOwner {
          require(newlockDuration <= 2419200, "Duration must be below 2 weeks");
          lockDuration = newlockDuration;
      }
  
      function updateExitPenalty(uint256 newPenaltyPerc) external onlyOwner {
          require(newPenaltyPerc <= 20, "May not set higher than 20%");
          exitPenaltyPerc = newPenaltyPerc;
      }
  }