creation_sourcecode: // File: QuisAI/SafeMath.sol
  
  
  // OpenZeppelin Contracts (last updated v4.6.0) (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 subtraction 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: QuisAI/Address.sol
  
  
  // OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)
  
  pragma solidity ^0.8.1;
  
  /**
   * @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
       * ====
       *
       * [IMPORTANT]
       * ====
       * You shouldn't rely on `isContract` to protect against flash loan attacks!
       *
       * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
       * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
       * constructor.
       * ====
       */
      function isContract(address account) internal view returns (bool) {
          // This method relies on extcodesize/address.code.length, which returns 0
          // for contracts in construction, since the code is only stored at the end
          // of the constructor execution.
  
          return account.code.length > 0;
      }
  
      /**
       * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
       * `recipient`, forwarding all available gas and reverting on errors.
       *
       * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
       * of certain opcodes, possibly making contracts go over the 2300 gas limit
       * imposed by `transfer`, making them unable to receive funds via
       * `transfer`. {sendValue} removes this limitation.
       *
       * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
       *
       * IMPORTANT: because control is transferred to `recipient`, care must be
       * taken to not create reentrancy vulnerabilities. Consider using
       * {ReentrancyGuard} or the
       * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
       */
      function sendValue(address payable recipient, uint256 amount) internal {
          require(address(this).balance >= amount, "Address: insufficient balance");
  
          (bool success, ) = recipient.call{value: amount}("");
          require(success, "Address: unable to send value, recipient may have reverted");
      }
  
      /**
       * @dev Performs a Solidity function call using a low level `call`. A
       * plain `call` is an unsafe replacement for a function call: use this
       * function instead.
       *
       * If `target` reverts with a revert reason, it is bubbled up by this
       * function (like regular Solidity function calls).
       *
       * Returns the raw returned data. To convert to the expected return value,
       * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
       *
       * Requirements:
       *
       * - `target` must be a contract.
       * - calling `target` with `data` must not revert.
       *
       * _Available since v3.1._
       */
      function functionCall(address target, bytes memory data) internal returns (bytes memory) {
          return functionCall(target, data, "Address: low-level call failed");
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
       * `errorMessage` as a fallback revert reason when `target` reverts.
       *
       * _Available since v3.1._
       */
      function functionCall(
          address target,
          bytes memory data,
          string memory errorMessage
      ) internal returns (bytes memory) {
          return functionCallWithValue(target, data, 0, errorMessage);
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
       * but also transferring `value` wei to `target`.
       *
       * Requirements:
       *
       * - the calling contract must have an ETH balance of at least `value`.
       * - the called Solidity function must be `payable`.
       *
       * _Available since v3.1._
       */
      function functionCallWithValue(
          address target,
          bytes memory data,
          uint256 value
      ) internal returns (bytes memory) {
          return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
      }
  
      /**
       * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
       * with `errorMessage` as a fallback revert reason when `target` reverts.
       *
       * _Available since v3.1._
       */
      function functionCallWithValue(
          address target,
          bytes memory data,
          uint256 value,
          string memory errorMessage
      ) internal returns (bytes memory) {
          require(address(this).balance >= value, "Address: insufficient balance for call");
          require(isContract(target), "Address: call to non-contract");
  
          (bool success, bytes memory returndata) = target.call{value: value}(data);
          return verifyCallResult(success, returndata, errorMessage);
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
       * but performing a static call.
       *
       * _Available since v3.3._
       */
      function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
          return functionStaticCall(target, data, "Address: low-level static call failed");
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
       * but performing a static call.
       *
       * _Available since v3.3._
       */
      function functionStaticCall(
          address target,
          bytes memory data,
          string memory errorMessage
      ) internal view returns (bytes memory) {
          require(isContract(target), "Address: static call to non-contract");
  
          (bool success, bytes memory returndata) = target.staticcall(data);
          return verifyCallResult(success, returndata, errorMessage);
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
       * but performing a delegate call.
       *
       * _Available since v3.4._
       */
      function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
          return functionDelegateCall(target, data, "Address: low-level delegate call failed");
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
       * but performing a delegate call.
       *
       * _Available since v3.4._
       */
      function functionDelegateCall(
          address target,
          bytes memory data,
          string memory errorMessage
      ) internal returns (bytes memory) {
          require(isContract(target), "Address: delegate call to non-contract");
  
          (bool success, bytes memory returndata) = target.delegatecall(data);
          return verifyCallResult(success, returndata, errorMessage);
      }
  
      /**
       * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
       * revert reason using the provided one.
       *
       * _Available since v4.3._
       */
      function verifyCallResult(
          bool success,
          bytes memory returndata,
          string memory errorMessage
      ) internal pure returns (bytes memory) {
          if (success) {
              return returndata;
          } else {
              // Look for revert reason and bubble it up if present
              if (returndata.length > 0) {
                  // The easiest way to bubble the revert reason is using memory via assembly
  
                  assembly {
                      let returndata_size := mload(returndata)
                      revert(add(32, returndata), returndata_size)
                  }
              } else {
                  revert(errorMessage);
              }
          }
      }
  }
  // File: QuisAI/IERC20.sol
  
  
  // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
  
  pragma solidity ^0.8.0;
  
  /**
   * @dev Interface of the ERC20 standard as defined in the EIP.
   */
  interface IERC20 {
      /**
       * @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 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 `to`.
       *
       * Returns a boolean value indicating whether the operation succeeded.
       *
       * Emits a {Transfer} event.
       */
      function transfer(address to, 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 `from` to `to` 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 from,
          address to,
          uint256 amount
      ) external returns (bool);
  }
  // File: QuisAI/SafeERC20.sol
  
  
  // OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)
  
  pragma solidity ^0.8.0;
  
  
  
  /**
   * @title SafeERC20
   * @dev Wrappers around ERC20 operations that throw on failure (when the token
   * contract returns false). Tokens that return no value (and instead revert or
   * throw on failure) are also supported, non-reverting calls are assumed to be
   * successful.
   * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
   * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
   */
  library SafeERC20 {
      using Address for address;
  
      function safeTransfer(
          IERC20 token,
          address to,
          uint256 value
      ) internal {
          _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
      }
  
      function safeTransferFrom(
          IERC20 token,
          address from,
          address to,
          uint256 value
      ) internal {
          _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
      }
  
      /**
       * @dev Deprecated. This function has issues similar to the ones found in
       * {IERC20-approve}, and its usage is discouraged.
       *
       * Whenever possible, use {safeIncreaseAllowance} and
       * {safeDecreaseAllowance} instead.
       */
      function safeApprove(
          IERC20 token,
          address spender,
          uint256 value
      ) internal {
          // safeApprove should only be called when setting an initial allowance,
          // or when resetting it to zero. To increase and decrease it, use
          // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
          require(
              (value == 0) || (token.allowance(address(this), spender) == 0),
              "SafeERC20: approve from non-zero to non-zero allowance"
          );
          _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
      }
  
      function safeIncreaseAllowance(
          IERC20 token,
          address spender,
          uint256 value
      ) internal {
          uint256 newAllowance = token.allowance(address(this), spender) + value;
          _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
      }
  
      function safeDecreaseAllowance(
          IERC20 token,
          address spender,
          uint256 value
      ) internal {
          unchecked {
              uint256 oldAllowance = token.allowance(address(this), spender);
              require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
              uint256 newAllowance = oldAllowance - value;
              _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
          }
      }
  
      /**
       * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
       * on the return value: the return value is optional (but if data is returned, it must not be false).
       * @param token The token targeted by the call.
       * @param data The call data (encoded using abi.encode or one of its variants).
       */
      function _callOptionalReturn(IERC20 token, bytes memory data) private {
          // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
          // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
          // the target address contains contract code and also asserts for success in the low-level call.
  
          bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
          if (returndata.length > 0) {
              // Return data is optional
              require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
          }
      }
  }
  // File: QuisAI/ReentrancyGuard.sol
  
  
  // OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)
  
  pragma solidity ^0.8.0;
  
  /**
   * @dev Contract module that helps prevent reentrant calls to a function.
   *
   * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
   * available, which can be applied to functions to make sure there are no nested
   * (reentrant) calls to them.
   *
   * Note that because there is a single `nonReentrant` guard, functions marked as
   * `nonReentrant` may not call one another. This can be worked around by making
   * those functions `private`, and then adding `external` `nonReentrant` entry
   * points to them.
   *
   * TIP: If you would like to learn more about reentrancy and alternative ways
   * to protect against it, check out our blog post
   * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
   */
  abstract contract ReentrancyGuard {
      // Booleans are more expensive than uint256 or any type that takes up a full
      // word because each write operation emits an extra SLOAD to first read the
      // slot's contents, replace the bits taken up by the boolean, and then write
      // back. This is the compiler's defense against contract upgrades and
      // pointer aliasing, and it cannot be disabled.
  
      // The values being non-zero value makes deployment a bit more expensive,
      // but in exchange the refund on every call to nonReentrant will be lower in
      // amount. Since refunds are capped to a percentage of the total
      // transaction's gas, it is best to keep them low in cases like this one, to
      // increase the likelihood of the full refund coming into effect.
      uint256 private constant _NOT_ENTERED = 1;
      uint256 private constant _ENTERED = 2;
  
      uint256 private _status;
  
      constructor() {
          _status = _NOT_ENTERED;
      }
  
      /**
       * @dev Prevents a contract from calling itself, directly or indirectly.
       * Calling a `nonReentrant` function from another `nonReentrant`
       * function is not supported. It is possible to prevent this from happening
       * by making the `nonReentrant` function external, and making it call a
       * `private` function that does the actual work.
       */
      modifier nonReentrant() {
          // On the first call to nonReentrant, _notEntered will be true
          require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
  
          // Any calls to nonReentrant after this point will fail
          _status = _ENTERED;
  
          _;
  
          // By storing the original value once again, a refund is triggered (see
          // https://eips.ethereum.org/EIPS/eip-2200)
          _status = _NOT_ENTERED;
      }
  }
  // File: QuisAI/Context.sol
  
  
  // OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
  
  pragma solidity ^0.8.0;
  
  /**
   * @dev Provides information about the current execution context, including the
   * sender of the transaction and its data. While these are generally available
   * via msg.sender and msg.data, they should not be accessed in such a direct
   * manner, since when dealing with meta-transactions the account sending and
   * paying for execution may not be the actual sender (as far as an application
   * is concerned).
   *
   * This contract is only required for intermediate, library-like contracts.
   */
  abstract contract Context {
      function _msgSender() internal view virtual returns (address) {
          return msg.sender;
      }
  
      function _msgData() internal view virtual returns (bytes calldata) {
          return msg.data;
      }
  }
  // File: QuisAI/Ownable.sol
  
  
  // OpenZeppelin Contracts v4.4.1 (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: QuisAI/QuisAIStaking.sol
  
  //SPDX-License-Identifier: UNLICENSED
  pragma solidity ^0.8.0;
  
  
  
  
  
  abstract contract IERC20Staking is ReentrancyGuard, Ownable {
  
      struct Plan {
          uint256 overallStaked;
          uint256 stakesCount;
          uint256 apr;
          uint256 stakeDuration;
          bool initialPool;
          bool conclude;
      }
      
      struct Staking {
          uint256 amount;
          uint256 stakeAt;
          uint256 endstakeAt;
      }
  
      mapping(uint256 => mapping(address => Staking[])) public stakes;
  
      // Declare state variables for tracking rewards
      uint256 public totalRewards;
      mapping(uint256 => uint256) public totalRewardsPerPlan;
      mapping(address => uint256) public totalEarnedRewardsPerWallet;
  
      // Declare state variable for tracking rewards per wallet per plan
      mapping(uint256 => mapping(address => uint256)) public totalRewardsPerWalletPerPlan;
  
  
      address public stakingToken;
      mapping(uint256 => Plan) public plans;
      mapping(address => bool) public blacklist;
  
      modifier notBlacklisted() {
          require(!blacklist[msg.sender], "Address is blacklisted");
          _;
      }
  
      constructor(address _stakingToken) {
          stakingToken = _stakingToken;
      }
  
      function stake(uint256 _stakingId, uint256 _amount) public virtual;
      function canWithdrawAmount(uint256 _stakingId, address account) public virtual view returns (uint256, uint256);
      function unstake(uint256 _stakingId, uint256 _amount) public virtual;
      function earnedToken(uint256 _stakingId, address account) public virtual view returns (uint256);
      function claimEarned(uint256 _stakingId) public virtual;
      function getStakedPlans(address _account) public virtual view returns (bool[] memory);
  }
  
  contract QuisAIStaking is IERC20Staking {
      using SafeMath for uint256;
      using SafeERC20 for IERC20;
  
      uint256 public periodicTime = 365 days;
      uint256 public planLimit = 4;
      uint256 minAPR = 1;
  
      constructor(address _stakingToken) IERC20Staking(_stakingToken) {
  
          plans[0].apr = 30;
          plans[0].stakeDuration = 7 days;
  
          plans[1].apr = 50;
          plans[1].stakeDuration = 15 days;
  
          plans[2].apr = 100;
          plans[2].stakeDuration = 30 days;
  
          plans[3].apr = 200;
          plans[3].stakeDuration = 60 days;
      }
  
      function stake(uint256 _stakingId, uint256 _amount) public nonReentrant override {
          require(_amount > 0, "Staking Amount cannot be zero");
          require(
              IERC20(stakingToken).balanceOf(msg.sender) >= _amount,
              "Balance is not enough"
          );
          require(_stakingId < planLimit, "Staking is unavailable");
          
          Plan storage plan = plans[_stakingId];
          require(!plan.conclude, "Staking in this pool is concluded");
  
          uint256 beforeBalance = IERC20(stakingToken).balanceOf(address(this));
          IERC20(stakingToken).transferFrom(msg.sender, address(this), _amount);
          uint256 afterBalance = IERC20(stakingToken).balanceOf(address(this));
          uint256 amount = afterBalance - beforeBalance;
          
          uint256 stakelength = stakes[_stakingId][msg.sender].length;
          
          if(stakelength == 0) {
              plan.stakesCount += 1;
          }
  
          stakes[_stakingId][msg.sender].push();
          
          Staking storage _staking = stakes[_stakingId][msg.sender][stakelength];
          _staking.amount = amount;
          _staking.stakeAt = block.timestamp;
          _staking.endstakeAt = block.timestamp + plan.stakeDuration;
          
          plan.overallStaked = plan.overallStaked.add(amount);
      }
  
      function stakeFor(uint256 _stakingId, uint256 _amount, address _beneficiary) public nonReentrant onlyOwner {
          require(_amount > 0, "Staking Amount cannot be zero");
          require(_stakingId < planLimit, "Staking is unavailable");
          require(_beneficiary != address(0), "Beneficiary cannot be zero address");
  
          Plan storage plan = plans[_stakingId];
          require(!plan.conclude, "Staking in this pool is concluded");
  
          // Transfer tokens from the sender to the contract
          uint256 beforeBalance = IERC20(stakingToken).balanceOf(address(this));
          IERC20(stakingToken).transferFrom(msg.sender, address(this), _amount);
          uint256 afterBalance = IERC20(stakingToken).balanceOf(address(this));
          uint256 amount = afterBalance.sub(beforeBalance);
  
          // Update staking details for the beneficiary
          uint256 stakelength = stakes[_stakingId][_beneficiary].length;
          if(stakelength == 0) {
              plan.stakesCount += 1;
          }
  
          stakes[_stakingId][_beneficiary].push(Staking({
              amount: amount,
              stakeAt: block.timestamp,
              endstakeAt: block.timestamp + plan.stakeDuration
          }));
          
          plan.overallStaked = plan.overallStaked.add(amount);
      }
  
      function canWithdrawAmount(uint256 _stakingId, address account) public override view returns (uint256, uint256) {
          uint256 _stakedAmount = 0;
          uint256 _canWithdraw = 0;
          
          for (uint256 i = 0; i < stakes[_stakingId][account].length; i++) {
              Staking storage _staking = stakes[_stakingId][account][i];
              _stakedAmount = _stakedAmount.add(_staking.amount);
  
              // Check if the lock duration has ended for each staking
              if (block.timestamp >= _staking.endstakeAt) {
                  _canWithdraw = _canWithdraw.add(_staking.amount);
              }
          }
  
          return (_stakedAmount, _canWithdraw);
      }
  
      function earnedToken(uint256 _stakingId, address account) public override view returns (uint256) {
          uint256 _earned = 0;
          Plan storage plan = plans[_stakingId];
          
          for (uint256 i = 0; i < stakes[_stakingId][account].length; i++) {
              Staking storage _staking = stakes[_stakingId][account][i];
              _earned = _earned.add(
                  _staking.amount
                      .mul(block.timestamp - _staking.stakeAt)
                      .div(periodicTime)
                      .mul(plan.apr)
                      .div(100)
              );
          }
  
          return _earned;
      }
  
      function unstake(uint256 _stakingId, uint256 _amount) public nonReentrant notBlacklisted override {
          uint256 _stakedAmount;
          uint256 _canWithdraw;
          uint256 _earned = 0;
  
          Plan storage plan = plans[_stakingId];
  
          // Get the total staked amount and the amount that can be withdrawn
          (_stakedAmount, _canWithdraw) = canWithdrawAmount(_stakingId, msg.sender);
          require(_canWithdraw >= _amount, "Withdraw amount exceeds allowed limit");
  
          uint256 remainingAmountToUnstake = _amount;
          
          for (uint256 i = stakes[_stakingId][msg.sender].length; i > 0; i--) {
              Staking storage _staking = stakes[_stakingId][msg.sender][i-1];
  
              // Check if the lock duration has ended
              if (block.timestamp >= _staking.endstakeAt && remainingAmountToUnstake > 0) {
                  uint256 amountToUnstake = _staking.amount < remainingAmountToUnstake ? _staking.amount : remainingAmountToUnstake;
  
                  // Calculate earned rewards for this stake
                  _earned += amountToUnstake
                          .mul(block.timestamp - _staking.stakeAt)
                          .div(periodicTime)
                          .mul(plan.apr)
                          .div(100);
  
                  // Update the staking amount and the amount remaining to be unstaked
                  _staking.amount -= amountToUnstake;
                  remainingAmountToUnstake -= amountToUnstake;
              }
          }
  
          require(remainingAmountToUnstake == 0, "Unable to unstake the full amount");
  
          // Transfer the unstaked principal amount and earned rewards to the user
          if (_amount > 0) {
              IERC20(stakingToken).transfer(msg.sender, _amount);
          }
          
          if (_earned > 0) {
              IERC20(stakingToken).transfer(msg.sender, _earned);
              
              totalRewards = totalRewards.add(_earned);
              totalRewardsPerPlan[_stakingId] = totalRewardsPerPlan[_stakingId].add(_earned);
  
              totalRewardsPerWalletPerPlan[_stakingId][msg.sender] = totalRewardsPerWalletPerPlan[_stakingId][msg.sender].add(_earned);
  
              // Update the total earned rewards for the wallet
              totalEarnedRewardsPerWallet[msg.sender] += _earned;
          }
  
          // Update the overall staked amount in the plan
          plan.overallStaked = plan.overallStaked.sub(_amount);
      }
  
      function claimEarned(uint256 _stakingId) public override {
          uint256 _earned = 0;
          Plan storage plan = plans[_stakingId];
  
          require(stakes[_stakingId][msg.sender].length > 0, "No stakes found");
  
          for (uint256 i = 0; i < stakes[_stakingId][msg.sender].length; i++) {
              Staking storage _staking = stakes[_stakingId][msg.sender][i];
              
              _earned = _earned.add(
                  _staking
                      .amount
                      .mul(plan.apr)
                      .mul(block.timestamp - _staking.stakeAt)
                      .div(periodicTime)
                      .div(100)
              );
  
              totalRewards = totalRewards.add(_earned);
              totalRewardsPerPlan[_stakingId] = totalRewardsPerPlan[_stakingId].add(_earned);
  
              totalRewardsPerWalletPerPlan[_stakingId][msg.sender] = totalRewardsPerWalletPerPlan[_stakingId][msg.sender].add(_earned);
  
              // Update the total earned rewards for the wallet
              totalEarnedRewardsPerWallet[msg.sender] += _earned;
          
              
              _staking.stakeAt = block.timestamp;
              
          }
          require(_earned > 0, "There is no amount to claim");
          IERC20(stakingToken).transfer(msg.sender, _earned);
      }
  
      function getStakedPlans(address _account) public override view returns (bool[] memory) {
          bool[] memory walletPlans = new bool[](planLimit);
          for (uint256 i = 0; i < planLimit; i++) {
              walletPlans[i] = stakes[i][_account].length == 0 ? false : true;
          }
          return walletPlans;
      }
  
      function setAPR(uint256 _stakingId, uint256 _percent) external onlyOwner {
          require(_percent >= minAPR);
          plans[_stakingId].apr = _percent;
      }
  
      function setStakeConclude(uint256 _stakingId, bool _conclude) external onlyOwner {
          plans[_stakingId].conclude = _conclude;
      }
  
      function addToBlacklist(address _address) external onlyOwner {
          blacklist[_address] = true;
      }
  
      function removeFromBlacklist(address _address) external onlyOwner {
          blacklist[_address] = false;
      }
  
        // Getter functions to retrieve totalRewards and totalRewardsPerPlan
      function getTotalRewards() public view returns (uint256) {
          return totalRewards;
      }
  
      function getTotalRewardsPerPlan(uint256 _stakingId) public view returns (uint256) {
          return totalRewardsPerPlan[_stakingId];
      }
  
      // Getter function to retrieve total earned rewards for a specific wallet
      function getTotalEarnedRewardsPerWallet(address _wallet) public view returns (uint256) {
          return totalEarnedRewardsPerWallet[_wallet];
      }
  
      receive() external payable {}
  }