creation_sourcecode: // SPDX-License-Identifier: MIT
  
  
  pragma solidity ^0.8.0;
  
  /**
   * @dev Library for reading and writing primitive types to specific storage slots.
   *
   * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
   * This library helps with reading and writing to such slots without the need for inline assembly.
   *
   * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
   *
   * Example usage to set ERC1967 implementation slot:
   * ```
   * contract ERC1967 {
   *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
   *
   *     function _getImplementation() internal view returns (address) {
   *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
   *     }
   *
   *     function _setImplementation(address newImplementation) internal {
   *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
   *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
   *     }
   * }
   * ```
   *
   * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
   */
  library StorageSlotUpgradeable {
      struct AddressSlot {
          address value;
      }
  
      struct BooleanSlot {
          bool value;
      }
  
      struct Bytes32Slot {
          bytes32 value;
      }
  
      struct Uint256Slot {
          uint256 value;
      }
  
      /**
       * @dev Returns an `AddressSlot` with member `value` located at `slot`.
       */
      function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
          /// @solidity memory-safe-assembly
          assembly {
              r.slot := slot
          }
      }
  
      /**
       * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
       */
      function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
          /// @solidity memory-safe-assembly
          assembly {
              r.slot := slot
          }
      }
  
      /**
       * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
       */
      function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
          /// @solidity memory-safe-assembly
          assembly {
              r.slot := slot
          }
      }
  
      /**
       * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
       */
      function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
          /// @solidity memory-safe-assembly
          assembly {
              r.slot := slot
          }
      }
  }
  
  // File: @openzeppelin/contracts-upgradeable/proxy/beacon/IBeaconUpgradeable.sol
  
  
  // OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
  
  pragma solidity ^0.8.0;
  
  /**
   * @dev This is the interface that {BeaconProxy} expects of its beacon.
   */
  interface IBeaconUpgradeable {
      /**
       * @dev Must return an address that can be used as a delegate call target.
       *
       * {BeaconProxy} will check that this address is a contract.
       */
      function implementation() external view returns (address);
  }
  
  // File: @openzeppelin/contracts-upgradeable/interfaces/draft-IERC1822Upgradeable.sol
  
  
  // OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)
  
  pragma solidity ^0.8.0;
  
  /**
   * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
   * proxy whose upgrades are fully controlled by the current implementation.
   */
  interface IERC1822ProxiableUpgradeable {
      /**
       * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
       * address.
       *
       * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
       * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
       * function revert if invoked through a proxy.
       */
      function proxiableUUID() external view returns (bytes32);
  }
  
  // File: @openzeppelin/contracts-upgradeable/utils/math/SafeMathUpgradeable.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 SafeMathUpgradeable {
      /**
       * @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: @openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol
  
  
  // OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)
  
  pragma solidity ^0.8.1;
  
  /**
   * @dev Collection of functions related to the address type
   */
  library AddressUpgradeable {
      /**
       * @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 functionCallWithValue(target, data, 0, "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");
          (bool success, bytes memory returndata) = target.call{value: value}(data);
          return verifyCallResultFromTarget(target, 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) {
          (bool success, bytes memory returndata) = target.staticcall(data);
          return verifyCallResultFromTarget(target, success, returndata, errorMessage);
      }
  
      /**
       * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
       * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
       *
       * _Available since v4.8._
       */
      function verifyCallResultFromTarget(
          address target,
          bool success,
          bytes memory returndata,
          string memory errorMessage
      ) internal view returns (bytes memory) {
          if (success) {
              if (returndata.length == 0) {
                  // only check isContract if the call was successful and the return data is empty
                  // otherwise we already know that it was a contract
                  require(isContract(target), "Address: call to non-contract");
              }
              return returndata;
          } else {
              _revert(returndata, errorMessage);
          }
      }
  
      /**
       * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
       * revert reason or 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 {
              _revert(returndata, errorMessage);
          }
      }
  
      function _revert(bytes memory returndata, string memory errorMessage) private pure {
          // 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
              /// @solidity memory-safe-assembly
              assembly {
                  let returndata_size := mload(returndata)
                  revert(add(32, returndata), returndata_size)
              }
          } else {
              revert(errorMessage);
          }
      }
  }
  
  // File: @openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol
  
  
  // OpenZeppelin Contracts (last updated v4.8.0) (proxy/utils/Initializable.sol)
  
  pragma solidity ^0.8.2;
  
  
  /**
   * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
   * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
   * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
   * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
   *
   * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
   * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
   * case an upgrade adds a module that needs to be initialized.
   *
   * For example:
   *
   * [.hljs-theme-light.nopadding]
   * ```
   * contract MyToken is ERC20Upgradeable {
   *     function initialize() initializer public {
   *         __ERC20_init("MyToken", "MTK");
   *     }
   * }
   * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
   *     function initializeV2() reinitializer(2) public {
   *         __ERC20Permit_init("MyToken");
   *     }
   * }
   * ```
   *
   * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
   * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
   *
   * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
   * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
   *
   * [CAUTION]
   * ====
   * Avoid leaving a contract uninitialized.
   *
   * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
   * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
   * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
   *
   * [.hljs-theme-light.nopadding]
   * ```
   * /// @custom:oz-upgrades-unsafe-allow constructor
   * constructor() {
   *     _disableInitializers();
   * }
   * ```
   * ====
   */
  abstract contract Initializable {
      /**
       * @dev Indicates that the contract has been initialized.
       * @custom:oz-retyped-from bool
       */
      uint8 private _initialized;
  
      /**
       * @dev Indicates that the contract is in the process of being initialized.
       */
      bool private _initializing;
  
      /**
       * @dev Triggered when the contract has been initialized or reinitialized.
       */
      event Initialized(uint8 version);
  
      /**
       * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
       * `onlyInitializing` functions can be used to initialize parent contracts.
       *
       * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
       * constructor.
       *
       * Emits an {Initialized} event.
       */
      modifier initializer() {
          bool isTopLevelCall = !_initializing;
          require(
              (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
              "Initializable: contract is already initialized"
          );
          _initialized = 1;
          if (isTopLevelCall) {
              _initializing = true;
          }
          _;
          if (isTopLevelCall) {
              _initializing = false;
              emit Initialized(1);
          }
      }
  
      /**
       * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
       * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
       * used to initialize parent contracts.
       *
       * A reinitializer may be used after the original initialization step. This is essential to configure modules that
       * are added through upgrades and that require initialization.
       *
       * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
       * cannot be nested. If one is invoked in the context of another, execution will revert.
       *
       * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
       * a contract, executing them in the right order is up to the developer or operator.
       *
       * WARNING: setting the version to 255 will prevent any future reinitialization.
       *
       * Emits an {Initialized} event.
       */
      modifier reinitializer(uint8 version) {
          require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
          _initialized = version;
          _initializing = true;
          _;
          _initializing = false;
          emit Initialized(version);
      }
  
      /**
       * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
       * {initializer} and {reinitializer} modifiers, directly or indirectly.
       */
      modifier onlyInitializing() {
          require(_initializing, "Initializable: contract is not initializing");
          _;
      }
  
      /**
       * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
       * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
       * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
       * through proxies.
       *
       * Emits an {Initialized} event the first time it is successfully executed.
       */
      function _disableInitializers() internal virtual {
          require(!_initializing, "Initializable: contract is initializing");
          if (_initialized < type(uint8).max) {
              _initialized = type(uint8).max;
              emit Initialized(type(uint8).max);
          }
      }
  
      /**
       * @dev Internal function that returns the initialized version. Returns `_initialized`
       */
      function _getInitializedVersion() internal view returns (uint8) {
          return _initialized;
      }
  
      /**
       * @dev Internal function that returns the initialized version. Returns `_initializing`
       */
      function _isInitializing() internal view returns (bool) {
          return _initializing;
      }
  }
  
  // File: @openzeppelin/contracts-upgradeable/proxy/ERC1967/ERC1967UpgradeUpgradeable.sol
  
  
  // OpenZeppelin Contracts (last updated v4.5.0) (proxy/ERC1967/ERC1967Upgrade.sol)
  
  pragma solidity ^0.8.2;
  
  
  
  
  
  
  /**
   * @dev This abstract contract provides getters and event emitting update functions for
   * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
   *
   * _Available since v4.1._
   *
   * @custom:oz-upgrades-unsafe-allow delegatecall
   */
  abstract contract ERC1967UpgradeUpgradeable is Initializable {
      function __ERC1967Upgrade_init() internal onlyInitializing {
      }
  
      function __ERC1967Upgrade_init_unchained() internal onlyInitializing {
      }
      // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
      bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
  
      /**
       * @dev Storage slot with the address of the current implementation.
       * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
       * validated in the constructor.
       */
      bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
  
      /**
       * @dev Emitted when the implementation is upgraded.
       */
      event Upgraded(address indexed implementation);
  
      /**
       * @dev Returns the current implementation address.
       */
      function _getImplementation() internal view returns (address) {
          return StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value;
      }
  
      /**
       * @dev Stores a new address in the EIP1967 implementation slot.
       */
      function _setImplementation(address newImplementation) private {
          require(AddressUpgradeable.isContract(newImplementation), "ERC1967: new implementation is not a contract");
          StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
      }
  
      /**
       * @dev Perform implementation upgrade
       *
       * Emits an {Upgraded} event.
       */
      function _upgradeTo(address newImplementation) internal {
          _setImplementation(newImplementation);
          emit Upgraded(newImplementation);
      }
  
      /**
       * @dev Perform implementation upgrade with additional setup call.
       *
       * Emits an {Upgraded} event.
       */
      function _upgradeToAndCall(
          address newImplementation,
          bytes memory data,
          bool forceCall
      ) internal {
          _upgradeTo(newImplementation);
          if (data.length > 0 || forceCall) {
              _functionDelegateCall(newImplementation, data);
          }
      }
  
      /**
       * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
       *
       * Emits an {Upgraded} event.
       */
      function _upgradeToAndCallUUPS(
          address newImplementation,
          bytes memory data,
          bool forceCall
      ) internal {
          // Upgrades from old implementations will perform a rollback test. This test requires the new
          // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
          // this special case will break upgrade paths from old UUPS implementation to new ones.
          if (StorageSlotUpgradeable.getBooleanSlot(_ROLLBACK_SLOT).value) {
              _setImplementation(newImplementation);
          } else {
              try IERC1822ProxiableUpgradeable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                  require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
              } catch {
                  revert("ERC1967Upgrade: new implementation is not UUPS");
              }
              _upgradeToAndCall(newImplementation, data, forceCall);
          }
      }
  
      /**
       * @dev Storage slot with the admin of the contract.
       * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
       * validated in the constructor.
       */
      bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
  
      /**
       * @dev Emitted when the admin account has changed.
       */
      event AdminChanged(address previousAdmin, address newAdmin);
  
      /**
       * @dev Returns the current admin.
       */
      function _getAdmin() internal view returns (address) {
          return StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value;
      }
  
      /**
       * @dev Stores a new address in the EIP1967 admin slot.
       */
      function _setAdmin(address newAdmin) private {
          require(newAdmin != address(0), "ERC1967: new admin is the zero address");
          StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
      }
  
      /**
       * @dev Changes the admin of the proxy.
       *
       * Emits an {AdminChanged} event.
       */
      function _changeAdmin(address newAdmin) internal {
          emit AdminChanged(_getAdmin(), newAdmin);
          _setAdmin(newAdmin);
      }
  
      /**
       * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
       * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
       */
      bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
  
      /**
       * @dev Emitted when the beacon is upgraded.
       */
      event BeaconUpgraded(address indexed beacon);
  
      /**
       * @dev Returns the current beacon.
       */
      function _getBeacon() internal view returns (address) {
          return StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value;
      }
  
      /**
       * @dev Stores a new beacon in the EIP1967 beacon slot.
       */
      function _setBeacon(address newBeacon) private {
          require(AddressUpgradeable.isContract(newBeacon), "ERC1967: new beacon is not a contract");
          require(
              AddressUpgradeable.isContract(IBeaconUpgradeable(newBeacon).implementation()),
              "ERC1967: beacon implementation is not a contract"
          );
          StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value = newBeacon;
      }
  
      /**
       * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
       * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
       *
       * Emits a {BeaconUpgraded} event.
       */
      function _upgradeBeaconToAndCall(
          address newBeacon,
          bytes memory data,
          bool forceCall
      ) internal {
          _setBeacon(newBeacon);
          emit BeaconUpgraded(newBeacon);
          if (data.length > 0 || forceCall) {
              _functionDelegateCall(IBeaconUpgradeable(newBeacon).implementation(), data);
          }
      }
  
      /**
       * @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) private returns (bytes memory) {
          require(AddressUpgradeable.isContract(target), "Address: delegate call to non-contract");
  
          // solhint-disable-next-line avoid-low-level-calls
          (bool success, bytes memory returndata) = target.delegatecall(data);
          return AddressUpgradeable.verifyCallResult(success, returndata, "Address: low-level delegate call failed");
      }
  
      /**
       * @dev This empty reserved space is put in place to allow future versions to add new
       * variables without shifting down storage in the inheritance chain.
       * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
       */
      uint256[50] private __gap;
  }
  
  // File: @openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol
  
  
  // OpenZeppelin Contracts (last updated v4.8.0) (proxy/utils/UUPSUpgradeable.sol)
  
  pragma solidity ^0.8.0;
  
  
  
  
  /**
   * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
   * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
   *
   * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
   * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
   * `UUPSUpgradeable` with a custom implementation of upgrades.
   *
   * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
   *
   * _Available since v4.1._
   */
  abstract contract UUPSUpgradeable is Initializable, IERC1822ProxiableUpgradeable, ERC1967UpgradeUpgradeable {
      function __UUPSUpgradeable_init() internal onlyInitializing {
      }
  
      function __UUPSUpgradeable_init_unchained() internal onlyInitializing {
      }
      /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
      address private immutable __self = address(this);
  
      /**
       * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
       * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
       * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
       * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
       * fail.
       */
      modifier onlyProxy() {
          require(address(this) != __self, "Function must be called through delegatecall");
          require(_getImplementation() == __self, "Function must be called through active proxy");
          _;
      }
  
      /**
       * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
       * callable on the implementing contract but not through proxies.
       */
      modifier notDelegated() {
          require(address(this) == __self, "UUPSUpgradeable: must not be called through delegatecall");
          _;
      }
  
      /**
       * @dev Implementation of the ERC1822 {proxiableUUID} function. This returns the storage slot used by the
       * implementation. It is used to validate the implementation's compatibility when performing an upgrade.
       *
       * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
       * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
       * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
       */
      function proxiableUUID() external view virtual override notDelegated returns (bytes32) {
          return _IMPLEMENTATION_SLOT;
      }
  
      /**
       * @dev Upgrade the implementation of the proxy to `newImplementation`.
       *
       * Calls {_authorizeUpgrade}.
       *
       * Emits an {Upgraded} event.
       */
      function upgradeTo(address newImplementation) external virtual onlyProxy {
          _authorizeUpgrade(newImplementation);
          _upgradeToAndCallUUPS(newImplementation, new bytes(0), false);
      }
  
      /**
       * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
       * encoded in `data`.
       *
       * Calls {_authorizeUpgrade}.
       *
       * Emits an {Upgraded} event.
       */
      function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual onlyProxy {
          _authorizeUpgrade(newImplementation);
          _upgradeToAndCallUUPS(newImplementation, data, true);
      }
  
      /**
       * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
       * {upgradeTo} and {upgradeToAndCall}.
       *
       * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
       *
       * ```solidity
       * function _authorizeUpgrade(address) internal override onlyOwner {}
       * ```
       */
      function _authorizeUpgrade(address newImplementation) internal virtual;
  
      /**
       * @dev This empty reserved space is put in place to allow future versions to add new
       * variables without shifting down storage in the inheritance chain.
       * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
       */
      uint256[50] private __gap;
  }
  
  // File: @openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol
  
  
  // OpenZeppelin Contracts (last updated v4.8.0) (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 ReentrancyGuardUpgradeable is Initializable {
      // 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;
  
      function __ReentrancyGuard_init() internal onlyInitializing {
          __ReentrancyGuard_init_unchained();
      }
  
      function __ReentrancyGuard_init_unchained() internal onlyInitializing {
          _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() {
          _nonReentrantBefore();
          _;
          _nonReentrantAfter();
      }
  
      function _nonReentrantBefore() private {
          // On the first call to nonReentrant, _status will be _NOT_ENTERED
          require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
  
          // Any calls to nonReentrant after this point will fail
          _status = _ENTERED;
      }
  
      function _nonReentrantAfter() private {
          // By storing the original value once again, a refund is triggered (see
          // https://eips.ethereum.org/EIPS/eip-2200)
          _status = _NOT_ENTERED;
      }
  
      /**
       * @dev This empty reserved space is put in place to allow future versions to add new
       * variables without shifting down storage in the inheritance chain.
       * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
       */
      uint256[49] private __gap;
  }
  
  // File: @openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.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 ContextUpgradeable is Initializable {
      function __Context_init() internal onlyInitializing {
      }
  
      function __Context_init_unchained() internal onlyInitializing {
      }
      function _msgSender() internal view virtual returns (address) {
          return msg.sender;
      }
  
      function _msgData() internal view virtual returns (bytes calldata) {
          return msg.data;
      }
  
      /**
       * @dev This empty reserved space is put in place to allow future versions to add new
       * variables without shifting down storage in the inheritance chain.
       * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
       */
      uint256[50] private __gap;
  }
  
  // File: @openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol
  
  
  // OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
  
  pragma solidity ^0.8.0;
  
  
  
  /**
   * @dev Contract module which provides a basic access control mechanism, where
   * there is an account (an owner) that can be granted exclusive access to
   * specific functions.
   *
   * By default, the owner account will be the one that deploys the contract. This
   * can later be changed with {transferOwnership}.
   *
   * This module is used through inheritance. It will make available the modifier
   * `onlyOwner`, which can be applied to your functions to restrict their use to
   * the owner.
   */
  abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
      address private _owner;
  
      event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
  
      /**
       * @dev Initializes the contract setting the deployer as the initial owner.
       */
      function __Ownable_init() internal onlyInitializing {
          __Ownable_init_unchained();
      }
  
      function __Ownable_init_unchained() internal onlyInitializing {
          _transferOwnership(_msgSender());
      }
  
      /**
       * @dev Throws if called by any account other than the owner.
       */
      modifier onlyOwner() {
          _checkOwner();
          _;
      }
  
      /**
       * @dev Returns the address of the current owner.
       */
      function owner() public view virtual returns (address) {
          return _owner;
      }
  
      /**
       * @dev Throws if the sender is not the owner.
       */
      function _checkOwner() internal view virtual {
          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);
      }
  
      /**
       * @dev This empty reserved space is put in place to allow future versions to add new
       * variables without shifting down storage in the inheritance chain.
       * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
       */
      uint256[49] private __gap;
  }
  
  // File: @openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol
  
  
  // OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)
  
  pragma solidity ^0.8.0;
  
  
  
  /**
   * @dev Contract module which allows children to implement an emergency stop
   * mechanism that can be triggered by an authorized account.
   *
   * This module is used through inheritance. It will make available the
   * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
   * the functions of your contract. Note that they will not be pausable by
   * simply including this module, only once the modifiers are put in place.
   */
  abstract contract PausableUpgradeable is Initializable, ContextUpgradeable {
      /**
       * @dev Emitted when the pause is triggered by `account`.
       */
      event Paused(address account);
  
      /**
       * @dev Emitted when the pause is lifted by `account`.
       */
      event Unpaused(address account);
  
      bool private _paused;
  
      /**
       * @dev Initializes the contract in unpaused state.
       */
      function __Pausable_init() internal onlyInitializing {
          __Pausable_init_unchained();
      }
  
      function __Pausable_init_unchained() internal onlyInitializing {
          _paused = false;
      }
  
      /**
       * @dev Modifier to make a function callable only when the contract is not paused.
       *
       * Requirements:
       *
       * - The contract must not be paused.
       */
      modifier whenNotPaused() {
          _requireNotPaused();
          _;
      }
  
      /**
       * @dev Modifier to make a function callable only when the contract is paused.
       *
       * Requirements:
       *
       * - The contract must be paused.
       */
      modifier whenPaused() {
          _requirePaused();
          _;
      }
  
      /**
       * @dev Returns true if the contract is paused, and false otherwise.
       */
      function paused() public view virtual returns (bool) {
          return _paused;
      }
  
      /**
       * @dev Throws if the contract is paused.
       */
      function _requireNotPaused() internal view virtual {
          require(!paused(), "Pausable: paused");
      }
  
      /**
       * @dev Throws if the contract is not paused.
       */
      function _requirePaused() internal view virtual {
          require(paused(), "Pausable: not paused");
      }
  
      /**
       * @dev Triggers stopped state.
       *
       * Requirements:
       *
       * - The contract must not be paused.
       */
      function _pause() internal virtual whenNotPaused {
          _paused = true;
          emit Paused(_msgSender());
      }
  
      /**
       * @dev Returns to normal state.
       *
       * Requirements:
       *
       * - The contract must be paused.
       */
      function _unpause() internal virtual whenPaused {
          _paused = false;
          emit Unpaused(_msgSender());
      }
  
      /**
       * @dev This empty reserved space is put in place to allow future versions to add new
       * variables without shifting down storage in the inheritance chain.
       * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
       */
      uint256[49] private __gap;
  }
  
  // File: @openzeppelin/contracts-upgradeable/utils/introspection/IERC165Upgradeable.sol
  
  
  // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
  
  pragma solidity ^0.8.0;
  
  /**
   * @dev Interface of the ERC165 standard, as defined in the
   * https://eips.ethereum.org/EIPS/eip-165[EIP].
   *
   * Implementers can declare support of contract interfaces, which can then be
   * queried by others ({ERC165Checker}).
   *
   * For an implementation, see {ERC165}.
   */
  interface IERC165Upgradeable {
      /**
       * @dev Returns true if this contract implements the interface defined by
       * `interfaceId`. See the corresponding
       * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
       * to learn more about how these ids are created.
       *
       * This function call must use less than 30 000 gas.
       */
      function supportsInterface(bytes4 interfaceId) external view returns (bool);
  }
  
  // File: @openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol
  
  
  // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
  
  pragma solidity ^0.8.0;
  
  
  
  /**
   * @dev Implementation of the {IERC165} interface.
   *
   * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
   * for the additional interface id that will be supported. For example:
   *
   * ```solidity
   * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
   *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
   * }
   * ```
   *
   * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
   */
  abstract contract ERC165Upgradeable is Initializable, IERC165Upgradeable {
      function __ERC165_init() internal onlyInitializing {
      }
  
      function __ERC165_init_unchained() internal onlyInitializing {
      }
      /**
       * @dev See {IERC165-supportsInterface}.
       */
      function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
          return interfaceId == type(IERC165Upgradeable).interfaceId;
      }
  
      /**
       * @dev This empty reserved space is put in place to allow future versions to add new
       * variables without shifting down storage in the inheritance chain.
       * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
       */
      uint256[50] private __gap;
  }
  
  // File: @openzeppelin/contracts-upgradeable/token/ERC1155/IERC1155ReceiverUpgradeable.sol
  
  
  // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol)
  
  pragma solidity ^0.8.0;
  
  
  /**
   * @dev _Available since v3.1._
   */
  interface IERC1155ReceiverUpgradeable is IERC165Upgradeable {
      /**
       * @dev Handles the receipt of a single ERC1155 token type. This function is
       * called at the end of a `safeTransferFrom` after the balance has been updated.
       *
       * NOTE: To accept the transfer, this must return
       * `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
       * (i.e. 0xf23a6e61, or its own function selector).
       *
       * @param operator The address which initiated the transfer (i.e. msg.sender)
       * @param from The address which previously owned the token
       * @param id The ID of the token being transferred
       * @param value The amount of tokens being transferred
       * @param data Additional data with no specified format
       * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
       */
      function onERC1155Received(
          address operator,
          address from,
          uint256 id,
          uint256 value,
          bytes calldata data
      ) external returns (bytes4);
  
      /**
       * @dev Handles the receipt of a multiple ERC1155 token types. This function
       * is called at the end of a `safeBatchTransferFrom` after the balances have
       * been updated.
       *
       * NOTE: To accept the transfer(s), this must return
       * `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
       * (i.e. 0xbc197c81, or its own function selector).
       *
       * @param operator The address which initiated the batch transfer (i.e. msg.sender)
       * @param from The address which previously owned the token
       * @param ids An array containing ids of each token being transferred (order and length must match values array)
       * @param values An array containing amounts of each token being transferred (order and length must match ids array)
       * @param data Additional data with no specified format
       * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
       */
      function onERC1155BatchReceived(
          address operator,
          address from,
          uint256[] calldata ids,
          uint256[] calldata values,
          bytes calldata data
      ) external returns (bytes4);
  }
  
  // File: @openzeppelin/contracts-upgradeable/token/ERC1155/utils/ERC1155ReceiverUpgradeable.sol
  
  
  // OpenZeppelin Contracts v4.4.1 (token/ERC1155/utils/ERC1155Receiver.sol)
  
  pragma solidity ^0.8.0;
  
  
  
  
  /**
   * @dev _Available since v3.1._
   */
  abstract contract ERC1155ReceiverUpgradeable is Initializable, ERC165Upgradeable, IERC1155ReceiverUpgradeable {
      function __ERC1155Receiver_init() internal onlyInitializing {
      }
  
      function __ERC1155Receiver_init_unchained() internal onlyInitializing {
      }
      /**
       * @dev See {IERC165-supportsInterface}.
       */
      function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) {
          return interfaceId == type(IERC1155ReceiverUpgradeable).interfaceId || super.supportsInterface(interfaceId);
      }
  
      /**
       * @dev This empty reserved space is put in place to allow future versions to add new
       * variables without shifting down storage in the inheritance chain.
       * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
       */
      uint256[50] private __gap;
  }
  
  // File: @openzeppelin/contracts-upgradeable/token/ERC1155/utils/ERC1155HolderUpgradeable.sol
  
  
  // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/utils/ERC1155Holder.sol)
  
  pragma solidity ^0.8.0;
  
  
  
  /**
   * Simple implementation of `ERC1155Receiver` that will allow a contract to hold ERC1155 tokens.
   *
   * IMPORTANT: When inheriting this contract, you must include a way to use the received tokens, otherwise they will be
   * stuck.
   *
   * @dev _Available since v3.1._
   */
  contract ERC1155HolderUpgradeable is Initializable, ERC1155ReceiverUpgradeable {
      function __ERC1155Holder_init() internal onlyInitializing {
      }
  
      function __ERC1155Holder_init_unchained() internal onlyInitializing {
      }
      function onERC1155Received(
          address,
          address,
          uint256,
          uint256,
          bytes memory
      ) public virtual override returns (bytes4) {
          return this.onERC1155Received.selector;
      }
  
      function onERC1155BatchReceived(
          address,
          address,
          uint256[] memory,
          uint256[] memory,
          bytes memory
      ) public virtual override returns (bytes4) {
          return this.onERC1155BatchReceived.selector;
      }
  
      /**
       * @dev This empty reserved space is put in place to allow future versions to add new
       * variables without shifting down storage in the inheritance chain.
       * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
       */
      uint256[50] private __gap;
  }
  
  // File: @openzeppelin/contracts-upgradeable/token/ERC1155/IERC1155Upgradeable.sol
  
  
  // OpenZeppelin Contracts (last updated v4.7.0) (token/ERC1155/IERC1155.sol)
  
  pragma solidity ^0.8.0;
  
  
  /**
   * @dev Required interface of an ERC1155 compliant contract, as defined in the
   * https://eips.ethereum.org/EIPS/eip-1155[EIP].
   *
   * _Available since v3.1._
   */
  interface IERC1155Upgradeable is IERC165Upgradeable {
      /**
       * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
       */
      event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);
  
      /**
       * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
       * transfers.
       */
      event TransferBatch(
          address indexed operator,
          address indexed from,
          address indexed to,
          uint256[] ids,
          uint256[] values
      );
  
      /**
       * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
       * `approved`.
       */
      event ApprovalForAll(address indexed account, address indexed operator, bool approved);
  
      /**
       * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
       *
       * If an {URI} event was emitted for `id`, the standard
       * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
       * returned by {IERC1155MetadataURI-uri}.
       */
      event URI(string value, uint256 indexed id);
  
      /**
       * @dev Returns the amount of tokens of token type `id` owned by `account`.
       *
       * Requirements:
       *
       * - `account` cannot be the zero address.
       */
      function balanceOf(address account, uint256 id) external view returns (uint256);
  
      /**
       * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
       *
       * Requirements:
       *
       * - `accounts` and `ids` must have the same length.
       */
      function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
          external
          view
          returns (uint256[] memory);
  
      /**
       * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
       *
       * Emits an {ApprovalForAll} event.
       *
       * Requirements:
       *
       * - `operator` cannot be the caller.
       */
      function setApprovalForAll(address operator, bool approved) external;
  
      /**
       * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
       *
       * See {setApprovalForAll}.
       */
      function isApprovedForAll(address account, address operator) external view returns (bool);
  
      /**
       * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
       *
       * Emits a {TransferSingle} event.
       *
       * Requirements:
       *
       * - `to` cannot be the zero address.
       * - If the caller is not `from`, it must have been approved to spend ``from``'s tokens via {setApprovalForAll}.
       * - `from` must have a balance of tokens of type `id` of at least `amount`.
       * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
       * acceptance magic value.
       */
      function safeTransferFrom(
          address from,
          address to,
          uint256 id,
          uint256 amount,
          bytes calldata data
      ) external;
  
      /**
       * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
       *
       * Emits a {TransferBatch} event.
       *
       * Requirements:
       *
       * - `ids` and `amounts` must have the same length.
       * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
       * acceptance magic value.
       */
      function safeBatchTransferFrom(
          address from,
          address to,
          uint256[] calldata ids,
          uint256[] calldata amounts,
          bytes calldata data
      ) external;
  }
  
  // File: @openzeppelin/contracts-upgradeable/token/ERC1155/extensions/IERC1155MetadataURIUpgradeable.sol
  
  
  // OpenZeppelin Contracts v4.4.1 (token/ERC1155/extensions/IERC1155MetadataURI.sol)
  
  pragma solidity ^0.8.0;
  
  
  /**
   * @dev Interface of the optional ERC1155MetadataExtension interface, as defined
   * in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP].
   *
   * _Available since v3.1._
   */
  interface IERC1155MetadataURIUpgradeable is IERC1155Upgradeable {
      /**
       * @dev Returns the URI for token type `id`.
       *
       * If the `\{id\}` substring is present in the URI, it must be replaced by
       * clients with the actual token type ID.
       */
      function uri(uint256 id) external view returns (string memory);
  }
  
  // File: @openzeppelin/contracts-upgradeable/token/ERC1155/ERC1155Upgradeable.sol
  
  
  // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC1155/ERC1155.sol)
  
  pragma solidity ^0.8.0;
  
  
  
  
  
  
  
  
  /**
   * @dev Implementation of the basic standard multi-token.
   * See https://eips.ethereum.org/EIPS/eip-1155
   * Originally based on code by Enjin: https://github.com/enjin/erc-1155
   *
   * _Available since v3.1._
   */
  contract ERC1155Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC1155Upgradeable, IERC1155MetadataURIUpgradeable {
      using AddressUpgradeable for address;
  
      // Mapping from token ID to account balances
      mapping(uint256 => mapping(address => uint256)) private _balances;
  
      // Mapping from account to operator approvals
      mapping(address => mapping(address => bool)) private _operatorApprovals;
  
      // Used as the URI for all token types by relying on ID substitution, e.g. https://token-cdn-domain/{id}.json
      string private _uri;
  
      /**
       * @dev See {_setURI}.
       */
      function __ERC1155_init(string memory uri_) internal onlyInitializing {
          __ERC1155_init_unchained(uri_);
      }
  
      function __ERC1155_init_unchained(string memory uri_) internal onlyInitializing {
          _setURI(uri_);
      }
  
      /**
       * @dev See {IERC165-supportsInterface}.
       */
      function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) {
          return
              interfaceId == type(IERC1155Upgradeable).interfaceId ||
              interfaceId == type(IERC1155MetadataURIUpgradeable).interfaceId ||
              super.supportsInterface(interfaceId);
      }
  
      /**
       * @dev See {IERC1155MetadataURI-uri}.
       *
       * This implementation returns the same URI for *all* token types. It relies
       * on the token type ID substitution mechanism
       * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
       *
       * Clients calling this function must replace the `\{id\}` substring with the
       * actual token type ID.
       */
      function uri(uint256) public view virtual override returns (string memory) {
          return _uri;
      }
  
      /**
       * @dev See {IERC1155-balanceOf}.
       *
       * Requirements:
       *
       * - `account` cannot be the zero address.
       */
      function balanceOf(address account, uint256 id) public view virtual override returns (uint256) {
          require(account != address(0), "ERC1155: address zero is not a valid owner");
          return _balances[id][account];
      }
  
      /**
       * @dev See {IERC1155-balanceOfBatch}.
       *
       * Requirements:
       *
       * - `accounts` and `ids` must have the same length.
       */
      function balanceOfBatch(address[] memory accounts, uint256[] memory ids)
          public
          view
          virtual
          override
          returns (uint256[] memory)
      {
          require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch");
  
          uint256[] memory batchBalances = new uint256[](accounts.length);
  
          for (uint256 i = 0; i < accounts.length; ++i) {
              batchBalances[i] = balanceOf(accounts[i], ids[i]);
          }
  
          return batchBalances;
      }
  
      /**
       * @dev See {IERC1155-setApprovalForAll}.
       */
      function setApprovalForAll(address operator, bool approved) public virtual override {
          _setApprovalForAll(_msgSender(), operator, approved);
      }
  
      /**
       * @dev See {IERC1155-isApprovedForAll}.
       */
      function isApprovedForAll(address account, address operator) public view virtual override returns (bool) {
          return _operatorApprovals[account][operator];
      }
  
      /**
       * @dev See {IERC1155-safeTransferFrom}.
       */
      function safeTransferFrom(
          address from,
          address to,
          uint256 id,
          uint256 amount,
          bytes memory data
      ) public virtual override {
          require(
              from == _msgSender() || isApprovedForAll(from, _msgSender()),
              "ERC1155: caller is not token owner or approved"
          );
          _safeTransferFrom(from, to, id, amount, data);
      }
  
      /**
       * @dev See {IERC1155-safeBatchTransferFrom}.
       */
      function safeBatchTransferFrom(
          address from,
          address to,
          uint256[] memory ids,
          uint256[] memory amounts,
          bytes memory data
      ) public virtual override {
          require(
              from == _msgSender() || isApprovedForAll(from, _msgSender()),
              "ERC1155: caller is not token owner or approved"
          );
          _safeBatchTransferFrom(from, to, ids, amounts, data);
      }
  
      /**
       * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
       *
       * Emits a {TransferSingle} event.
       *
       * Requirements:
       *
       * - `to` cannot be the zero address.
       * - `from` must have a balance of tokens of type `id` of at least `amount`.
       * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
       * acceptance magic value.
       */
      function _safeTransferFrom(
          address from,
          address to,
          uint256 id,
          uint256 amount,
          bytes memory data
      ) internal virtual {
          require(to != address(0), "ERC1155: transfer to the zero address");
  
          address operator = _msgSender();
          uint256[] memory ids = _asSingletonArray(id);
          uint256[] memory amounts = _asSingletonArray(amount);
  
          _beforeTokenTransfer(operator, from, to, ids, amounts, data);
  
          uint256 fromBalance = _balances[id][from];
          require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
          unchecked {
              _balances[id][from] = fromBalance - amount;
          }
          _balances[id][to] += amount;
  
          emit TransferSingle(operator, from, to, id, amount);
  
          _afterTokenTransfer(operator, from, to, ids, amounts, data);
  
          _doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data);
      }
  
      /**
       * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_safeTransferFrom}.
       *
       * Emits a {TransferBatch} event.
       *
       * Requirements:
       *
       * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
       * acceptance magic value.
       */
      function _safeBatchTransferFrom(
          address from,
          address to,
          uint256[] memory ids,
          uint256[] memory amounts,
          bytes memory data
      ) internal virtual {
          require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
          require(to != address(0), "ERC1155: transfer to the zero address");
  
          address operator = _msgSender();
  
          _beforeTokenTransfer(operator, from, to, ids, amounts, data);
  
          for (uint256 i = 0; i < ids.length; ++i) {
              uint256 id = ids[i];
              uint256 amount = amounts[i];
  
              uint256 fromBalance = _balances[id][from];
              require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
              unchecked {
                  _balances[id][from] = fromBalance - amount;
              }
              _balances[id][to] += amount;
          }
  
          emit TransferBatch(operator, from, to, ids, amounts);
  
          _afterTokenTransfer(operator, from, to, ids, amounts, data);
  
          _doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data);
      }
  
      /**
       * @dev Sets a new URI for all token types, by relying on the token type ID
       * substitution mechanism
       * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
       *
       * By this mechanism, any occurrence of the `\{id\}` substring in either the
       * URI or any of the amounts in the JSON file at said URI will be replaced by
       * clients with the token type ID.
       *
       * For example, the `https://token-cdn-domain/\{id\}.json` URI would be
       * interpreted by clients as
       * `https://token-cdn-domain/000000000000000000000000000000000000000000000000000000000004cce0.json`
       * for token type ID 0x4cce0.
       *
       * See {uri}.
       *
       * Because these URIs cannot be meaningfully represented by the {URI} event,
       * this function emits no events.
       */
      function _setURI(string memory newuri) internal virtual {
          _uri = newuri;
      }
  
      /**
       * @dev Creates `amount` tokens of token type `id`, and assigns them to `to`.
       *
       * Emits a {TransferSingle} event.
       *
       * Requirements:
       *
       * - `to` cannot be the zero address.
       * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
       * acceptance magic value.
       */
      function _mint(
          address to,
          uint256 id,
          uint256 amount,
          bytes memory data
      ) internal virtual {
          require(to != address(0), "ERC1155: mint to the zero address");
  
          address operator = _msgSender();
          uint256[] memory ids = _asSingletonArray(id);
          uint256[] memory amounts = _asSingletonArray(amount);
  
          _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);
  
          _balances[id][to] += amount;
          emit TransferSingle(operator, address(0), to, id, amount);
  
          _afterTokenTransfer(operator, address(0), to, ids, amounts, data);
  
          _doSafeTransferAcceptanceCheck(operator, address(0), to, id, amount, data);
      }
  
      /**
       * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_mint}.
       *
       * Emits a {TransferBatch} event.
       *
       * Requirements:
       *
       * - `ids` and `amounts` must have the same length.
       * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
       * acceptance magic value.
       */
      function _mintBatch(
          address to,
          uint256[] memory ids,
          uint256[] memory amounts,
          bytes memory data
      ) internal virtual {
          require(to != address(0), "ERC1155: mint to the zero address");
          require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
  
          address operator = _msgSender();
  
          _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);
  
          for (uint256 i = 0; i < ids.length; i++) {
              _balances[ids[i]][to] += amounts[i];
          }
  
          emit TransferBatch(operator, address(0), to, ids, amounts);
  
          _afterTokenTransfer(operator, address(0), to, ids, amounts, data);
  
          _doSafeBatchTransferAcceptanceCheck(operator, address(0), to, ids, amounts, data);
      }
  
      /**
       * @dev Destroys `amount` tokens of token type `id` from `from`
       *
       * Emits a {TransferSingle} event.
       *
       * Requirements:
       *
       * - `from` cannot be the zero address.
       * - `from` must have at least `amount` tokens of token type `id`.
       */
      function _burn(
          address from,
          uint256 id,
          uint256 amount
      ) internal virtual {
          require(from != address(0), "ERC1155: burn from the zero address");
  
          address operator = _msgSender();
          uint256[] memory ids = _asSingletonArray(id);
          uint256[] memory amounts = _asSingletonArray(amount);
  
          _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");
  
          uint256 fromBalance = _balances[id][from];
          require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
          unchecked {
              _balances[id][from] = fromBalance - amount;
          }
  
          emit TransferSingle(operator, from, address(0), id, amount);
  
          _afterTokenTransfer(operator, from, address(0), ids, amounts, "");
      }
  
      /**
       * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_burn}.
       *
       * Emits a {TransferBatch} event.
       *
       * Requirements:
       *
       * - `ids` and `amounts` must have the same length.
       */
      function _burnBatch(
          address from,
          uint256[] memory ids,
          uint256[] memory amounts
      ) internal virtual {
          require(from != address(0), "ERC1155: burn from the zero address");
          require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
  
          address operator = _msgSender();
  
          _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");
  
          for (uint256 i = 0; i < ids.length; i++) {
              uint256 id = ids[i];
              uint256 amount = amounts[i];
  
              uint256 fromBalance = _balances[id][from];
              require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
              unchecked {
                  _balances[id][from] = fromBalance - amount;
              }
          }
  
          emit TransferBatch(operator, from, address(0), ids, amounts);
  
          _afterTokenTransfer(operator, from, address(0), ids, amounts, "");
      }
  
      /**
       * @dev Approve `operator` to operate on all of `owner` tokens
       *
       * Emits an {ApprovalForAll} event.
       */
      function _setApprovalForAll(
          address owner,
          address operator,
          bool approved
      ) internal virtual {
          require(owner != operator, "ERC1155: setting approval status for self");
          _operatorApprovals[owner][operator] = approved;
          emit ApprovalForAll(owner, operator, approved);
      }
  
      /**
       * @dev Hook that is called before any token transfer. This includes minting
       * and burning, as well as batched variants.
       *
       * The same hook is called on both single and batched variants. For single
       * transfers, the length of the `ids` and `amounts` arrays will be 1.
       *
       * Calling conditions (for each `id` and `amount` pair):
       *
       * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens
       * of token type `id` will be  transferred to `to`.
       * - When `from` is zero, `amount` tokens of token type `id` will be minted
       * for `to`.
       * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`
       * will be burned.
       * - `from` and `to` are never both zero.
       * - `ids` and `amounts` have the same, non-zero length.
       *
       * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
       */
      function _beforeTokenTransfer(
          address operator,
          address from,
          address to,
          uint256[] memory ids,
          uint256[] memory amounts,
          bytes memory data
      ) internal virtual {}
  
      /**
       * @dev Hook that is called after any token transfer. This includes minting
       * and burning, as well as batched variants.
       *
       * The same hook is called on both single and batched variants. For single
       * transfers, the length of the `id` and `amount` arrays will be 1.
       *
       * Calling conditions (for each `id` and `amount` pair):
       *
       * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens
       * of token type `id` will be  transferred to `to`.
       * - When `from` is zero, `amount` tokens of token type `id` will be minted
       * for `to`.
       * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`
       * will be burned.
       * - `from` and `to` are never both zero.
       * - `ids` and `amounts` have the same, non-zero length.
       *
       * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
       */
      function _afterTokenTransfer(
          address operator,
          address from,
          address to,
          uint256[] memory ids,
          uint256[] memory amounts,
          bytes memory data
      ) internal virtual {}
  
      function _doSafeTransferAcceptanceCheck(
          address operator,
          address from,
          address to,
          uint256 id,
          uint256 amount,
          bytes memory data
      ) private {
          if (to.isContract()) {
              try IERC1155ReceiverUpgradeable(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) {
                  if (response != IERC1155ReceiverUpgradeable.onERC1155Received.selector) {
                      revert("ERC1155: ERC1155Receiver rejected tokens");
                  }
              } catch Error(string memory reason) {
                  revert(reason);
              } catch {
                  revert("ERC1155: transfer to non-ERC1155Receiver implementer");
              }
          }
      }
  
      function _doSafeBatchTransferAcceptanceCheck(
          address operator,
          address from,
          address to,
          uint256[] memory ids,
          uint256[] memory amounts,
          bytes memory data
      ) private {
          if (to.isContract()) {
              try IERC1155ReceiverUpgradeable(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (
                  bytes4 response
              ) {
                  if (response != IERC1155ReceiverUpgradeable.onERC1155BatchReceived.selector) {
                      revert("ERC1155: ERC1155Receiver rejected tokens");
                  }
              } catch Error(string memory reason) {
                  revert(reason);
              } catch {
                  revert("ERC1155: transfer to non-ERC1155Receiver implementer");
              }
          }
      }
  
      function _asSingletonArray(uint256 element) private pure returns (uint256[] memory) {
          uint256[] memory array = new uint256[](1);
          array[0] = element;
  
          return array;
      }
  
      /**
       * @dev This empty reserved space is put in place to allow future versions to add new
       * variables without shifting down storage in the inheritance chain.
       * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
       */
      uint256[47] private __gap;
  }
  
  // File: ERC1155.sol
  
  
  pragma solidity ^0.8.9;
  
  
  interface IMC{
      struct OwnershipDet{
          address[] receiver;
          uint256[] royaltyPercent;
      }
  
      function getTokenMinter(uint256 _tokenId) external returns(address);
      function fgetRoyaltyFeeInPBP(address _address , uint256 _tokenId) external returns(uint256);
      function getOwnershipDet(address _nftAddress, uint256 _tokenId) external view returns (OwnershipDet memory);
  }
  
  
  
  contract BITSmarketplace is Initializable, ERC1155HolderUpgradeable ,OwnableUpgradeable, UUPSUpgradeable ,  PausableUpgradeable ,ReentrancyGuardUpgradeable {
  
  
      using SafeMathUpgradeable for uint256;
  
     //--State Variables -----------------------------------------------------------------------------/
  
      IMC private imc;
      uint256 private highestBid;
      uint256 private returningTime;
      address private highestBidder;
      address public mintingcontract;
      address public MarketPlaceOwner ;
      uint256 public PlatFormServiceFee ;
      string public Symbol;
      string public Name;
   
      function initialize(address _mintingContract) initializer public {
  
          PlatFormServiceFee = 250; 
          MarketPlaceOwner = msg.sender;
          mintingcontract = _mintingContract;
          Name = "BITSnftmarketplace";
          Symbol = "BXTS";
  
          __Pausable_init();
          __Ownable_init();
          __UUPSUpgradeable_init();
      }
  
       //--Modifires------------------------------------------------------------------------------------/
  
  
      modifier IsForSale(uint256 id)
      {
          require(Fixedprices[id].isSold == false , "Item is already Sold");_;
      }
      modifier OnlyTokenHolders(uint256 _tokenid , address _nftAddress)
      {
          require(IERC1155Upgradeable(_nftAddress).balanceOf(msg.sender, _tokenid)>0 , "You are not the owner of Token");_;
      }
      modifier ItemExists(uint256 id)
      {   
          require(id < Fixedprices.length && Fixedprices[id].fixedid == id , "Could not find item");_;
      }
      
      //--Structs--------------------------------------------------------------------------------------/
  
  
      struct TokenInfo 
      {
          address _owner;             // address of owner role
          uint64 _expires;            // unix timestamp, user expires
          uint64 _originalPrice;      // original price of token
          uint64 _security;           // security for the token till expiring time
      }
  
    
      struct FixedPrice
      {
          bool isSold;
          bool forsale;
          bool listing;
          address owner;
          address newowner;
          address nftAddress;
          uint256 price;
          uint256 paid;   
          uint256 fixedid;
          uint256 tokenid;
          uint256 copiesForSale; ///
          uint256 totalcopies;
          uint256 RoyaltyFee;
          address[] RoyaltyReciver;
          uint256[] RoyaltyPercentages;
      }
  
  
      struct Auction
      {
          bool isSold;
          bool OpenForBidding;
          uint256 initialPrice;
          uint256 auctionid;
          uint256 tokenId;
          uint256 numberofcopies;
          uint256 auctionEndTime;      
          uint256 auctionStartTime;
          uint256 currentBidAmount;
          address currentBidOwner;
          address nftAddress;
          address nftOwner;
          uint256 RoyaltyFee;
          address[] RoyaltyReciver;
          uint256[] RoyaltyPercentages;
      }
  
      struct bidStruct
      {
          uint256 tokenid;
          uint256 bidCount;
          uint256 addressCount;
          uint256[] addedAt;
          address[] bidder;
          uint256[] bidAmount;
      }
      
      // bool indexAvailableForListing = true;
  
  
      //--Mappings-------------------------------------------------------------------------------------/
  
      mapping(uint256 => bidStruct) private bids;
      mapping(uint256 => bool) private isBidPlaced;
      mapping(uint256 => bool) public isIndexUsedForListing;
      mapping(uint256 => bool) private isAuctionEnded;
      mapping(uint256 => bool) public isAuctionListedCancelled ;
      mapping(address => mapping(uint => bool)) private isBidder;
      mapping(address => mapping(uint => bool)) public isNFTClaimed;
      mapping (uint256  => TokenInfo) public tokensForRent;
  
      //--Arrays--------------------------------------------------------------------------------------/
  
      Auction[] public auctions;
      FixedPrice[] public Fixedprices;
  
      //--Events--------------------------------------------------------------------------------------/
  
      event OfferSale(uint256 _fixeditemid);
      event AuctionStart(uint256 _auctionid);
      event AuctionEnded(address winner, uint amount);
      event HighestBidIcrease(address bidder, uint amount);
      event claimNft(uint256 auctionid , uint256 tokenId , address seller , address winner );
      event auctionend(uint256 auctionid , uint256 tokenId , address seller , address winner );
      event cancellAuction(uint256 listingId , uint256  tokenid , address  owner , uint256 amount);
      event listitemforfixeprice(uint256 tokenid , uint256 amount , uint256 price , uint256 _listingid);   
      event cancelFixedPriceListing(uint256  listingId , uint256  tokenid , address  owner , uint256 amount);
      event buyFixedprice(uint256 tokenid , uint256 amount , address buyer , address seller, uint256 platformfee  ,uint256 amountPaytoSeller , uint256 _royaltyfee);
      event listitemforauction(uint256 tokenid , uint256 amount ,  uint256 initialprice , uint256 auctionStartTime , uint256 auctionEndTime , uint256 _listingid);
  
      //--Functions-----------------------------------------------------------------------------------/
  
  
      function setPlatFormServiceFee(uint256 _servicefee) public returns(uint256)
      {
          require(msg.sender == MarketPlaceOwner , "Only Owner can set ServiceFee");
          require(_servicefee <= 1000 && _servicefee >=100 , "Can not be greater than 10 % ");
          PlatFormServiceFee = _servicefee;
          return PlatFormServiceFee;
      }
      function calulatePlatFormServiceFee(uint256 _salePrice , uint256 _PBP) private pure returns(uint256)
      {
          require(_salePrice !=0 , "Price of NFT can not be zero");
          require(_PBP <=10000 , "Service Fee can not be greater than Sale Price");
          uint256 serviceFee = _salePrice.mul(_PBP).div(10000);
          return(serviceFee);
      }
  
       function calculateRoyaltyFee(uint256 _salePrice , uint256 _PBP) private pure returns(uint256)
      {
          require(_salePrice !=0 , "Royalt Fee can not be zero");
          require(_PBP <=10000 , "Royalty Fee can not be greater than Sale Price");
          uint256 RoyaltyFee = _salePrice.mul(_PBP).div(10000);
          return RoyaltyFee; 
      }
  
  
      //--List item for fixed price--------------------------------------------------------------------/
  
  
      function listItemForFixedPrice(uint256 _tokenId, uint256 _amount , uint256 _price , address _nftAddress)public OnlyTokenHolders(_tokenId , _nftAddress) returns(uint256 _newitemid)
      {
  
          require(_tokenId >= 0 , "No Negative number is allowed");
          require(_amount  > 0 ,   "nft amount can't be zero");
          require(_price   > 0  , "price can not be 0");
          require(_nftAddress != address(0), "Invalid NFT Address");
  
          uint256 newItemId = Fixedprices.length;
          imc = IMC(_nftAddress);
          IMC.OwnershipDet memory ownerRecipe = imc.getOwnershipDet(_nftAddress, _tokenId);
          uint256 royaltypbp = imc.fgetRoyaltyFeeInPBP(_nftAddress , _tokenId);
  
          Fixedprices.push(FixedPrice(false,true,true,msg.sender,address(0),_nftAddress,_price,0,newItemId,_tokenId,_amount , _amount,royaltypbp, ownerRecipe.receiver, ownerRecipe.royaltyPercent));
          IERC1155Upgradeable(_nftAddress).safeTransferFrom(msg.sender,address(this), _tokenId, _amount, "0x00"); 
          emit OfferSale(newItemId);
          emit listitemforfixeprice(_tokenId,_amount,_price, newItemId);
          isIndexUsedForListing[newItemId] = true;
  
          return newItemId; 
          
      }
  
  
  
      //--List item for Auction--------------------------------------------------------------------/
  
      function listItemForAuction(uint256 _initialPrice, uint256 _biddingStartTime, uint256 _biddingendtime , uint256 tokenId, uint256 _numberofcopies , address _nftAddress) 
      public  OnlyTokenHolders(tokenId , _nftAddress) returns(uint256)
      {
          require(_initialPrice > 0 , "intial price can't be zero");
          require(tokenId >= 0 , "tokenid can't be negative");
          require(_numberofcopies > 0 , "0 amount can't be listed");
          require(_nftAddress != address(0), "Invalid address");
          require(_biddingStartTime >= block.timestamp , "startTime can't be less than currentTime");
          require(_biddingendtime > block.timestamp , "endTime can't be currentTime or a pastTime");
  
             uint256 newauctionid = auctions.length;
  
              imc = IMC(_nftAddress);
              IMC.OwnershipDet memory ownerRecipe = imc.getOwnershipDet(_nftAddress, tokenId);
              uint256 royaltypbp = imc.fgetRoyaltyFeeInPBP(_nftAddress , tokenId);
  
              auctions.
              push(Auction(false,true,_initialPrice,newauctionid,tokenId,_numberofcopies,_biddingendtime,_biddingStartTime,0,address(0) , _nftAddress,msg.sender,royaltypbp, ownerRecipe.receiver, ownerRecipe.royaltyPercent));
              IERC1155Upgradeable(_nftAddress).safeTransferFrom(msg.sender,address(this),tokenId , _numberofcopies,'0x00');
  
              emit AuctionStart(newauctionid);
              emit listitemforauction(tokenId,_numberofcopies,_initialPrice,_biddingStartTime,_biddingendtime,newauctionid);
              isIndexUsedForListing[newauctionid] = true;
  
  
              return newauctionid; 
  
      }
  
      // Buy Fixed Price---------------------------------------------------------------------------------------------------
  
  
      function BuyFixedPriceItem(uint256 fixedid, uint256 _copies) payable public ItemExists(fixedid) IsForSale(fixedid) returns(bool)
      { 
          require(msg.sender != Fixedprices[fixedid].owner , "owner of this nft can not buy");    
          require(msg.value ==  (Fixedprices[fixedid].price).mul(_copies),"send wrong amount in fixed price");
          require(Fixedprices[fixedid].forsale,"This NFT is not for sale");
          require(_copies > 0 && _copies <= Fixedprices[fixedid].copiesForSale, "Invalid number of copies");
          Fixedprices[fixedid].copiesForSale -= _copies;
  
          Fixedprices[fixedid].paid += msg.value; 
          Fixedprices[fixedid].newowner = msg.sender;
  
          address tokenOwner = IMC(Fixedprices[fixedid].nftAddress).getTokenMinter(Fixedprices[fixedid].tokenid);
  
          if(Fixedprices[fixedid].owner == tokenOwner){
              uint256 ServiceFees = calulatePlatFormServiceFee(msg.value, PlatFormServiceFee);
              uint256 amountToSendOwners = (msg.value).sub(ServiceFees);   
              for (uint256 i = 0; i < Fixedprices[fixedid].RoyaltyReciver.length; i++) 
              {
                  uint256 amount = ((amountToSendOwners).mul(Fixedprices[fixedid].RoyaltyPercentages[i])) / 10000;
                  payable(Fixedprices[fixedid].RoyaltyReciver[i]).transfer(amount);
              }
          }else{
          uint256 RoyaltyFees = calculateRoyaltyFee(msg.value, Fixedprices[fixedid].RoyaltyFee);
          uint256 ServiceFee = calulatePlatFormServiceFee(msg.value, PlatFormServiceFee);
          uint256 totalFee = ServiceFee + RoyaltyFees;
          uint256 amountToSendSeller = (msg.value).sub(totalFee);        
         
          payable(MarketPlaceOwner).transfer(ServiceFee);
  
  
          for(uint i = 0 ; i< Fixedprices[fixedid].RoyaltyReciver.length ; i++){  
  
              uint256 amount = ((RoyaltyFees).mul(Fixedprices[fixedid].RoyaltyPercentages[i])) / 10000;
              payable(Fixedprices[fixedid].RoyaltyReciver[i]).transfer(amount);
              
          }
  
          payable(Fixedprices[fixedid].owner).transfer(amountToSendSeller);
  
          emit buyFixedprice(Fixedprices[fixedid].tokenid,Fixedprices[fixedid].totalcopies,Fixedprices[fixedid].newowner,Fixedprices[fixedid].owner, ServiceFee,amountToSendSeller,RoyaltyFees );
      }
  
          IERC1155Upgradeable(Fixedprices[fixedid].nftAddress).safeTransferFrom(
          address(this),
          Fixedprices[fixedid].newowner,
          Fixedprices[fixedid].tokenid,
          _copies,
          "0x00"
          );
  
         
         if(Fixedprices[fixedid].copiesForSale == 0){
          Fixedprices[fixedid].isSold = true;
          Fixedprices[fixedid].forsale = false;
          Fixedprices[fixedid].listing = false;
         }
  
         sendNFTToOwner();
  
          return true;
  
      }
  
  
      // Bid Placed --------------------------------------------------------------------------------------------/
  
      function bid( uint256 _auctionId) payable public 
      {
          require(msg.sender != auctions[_auctionId].nftOwner,"Seller can not place the bid on his own NFT");
          require(block.timestamp >= auctions[_auctionId].auctionStartTime && block.timestamp < auctions[_auctionId].auctionEndTime, "Auction is not started yet or it is ended");
          require(msg.value >= auctions[_auctionId].initialPrice, "place a higher Bid than initial price");
  
          address  currentBidOwner  = auctions[_auctionId].currentBidOwner;
          uint256  currentBidAmount = auctions[_auctionId].currentBidAmount;
  
          if(msg.value <=  currentBidAmount) 
          {
              revert("There is already higer or equal bid exist");
          }
          if(msg.value > currentBidAmount) 
          {
              payable(currentBidOwner).transfer(currentBidAmount);
          }
  
          isBidPlaced[_auctionId] = true;
          isBidder[msg.sender][_auctionId] = true;
  
          auctions[_auctionId].currentBidOwner = msg.sender;
          auctions[_auctionId].currentBidAmount = msg.value; 
      
          highestBidder =  auctions[_auctionId].currentBidOwner;
          highestBid =  auctions[_auctionId].currentBidAmount;
  
          // stroing bids info
  
          bids[_auctionId].tokenid = auctions[_auctionId].tokenId;
          bids[_auctionId].addedAt.push(block.timestamp);    
          bids[_auctionId].bidder.push(msg.sender);    
          bids[_auctionId].bidAmount.push(highestBid);
  
          bids[_auctionId].bidCount++;
          bids[_auctionId].addressCount++;
  
          if(auctions[_auctionId].auctionEndTime - block.timestamp < 3600){
              auctions[_auctionId].auctionEndTime += 300;
          }
  
          sendNFTToOwner();
  
          emit HighestBidIcrease(msg.sender , msg.value);
  
  
      }
      
      // Auction end
      function endExpiredAuction(uint256 _auctionId) internal 
      {
          require(_auctionId >= 0,"inavlid auction id");
          require(block.timestamp >= auctions[_auctionId].auctionEndTime , "auction is not expired yet");
  
          if(isAuctionEnded[_auctionId])
          {
              revert("You have already ended the auction");
          }else
          {
              address tokenOwner = IMC(auctions[_auctionId].nftAddress).getTokenMinter(auctions[_auctionId].tokenId);
  
              if(auctions[_auctionId].nftOwner == tokenOwner){
              uint256 ServiceFees = calulatePlatFormServiceFee(auctions[_auctionId].currentBidAmount, PlatFormServiceFee);
              uint256 amountToSendOwners = (auctions[_auctionId].currentBidAmount).sub(ServiceFees); 
  
              for (uint256 i = 0; i < auctions[_auctionId].RoyaltyReciver.length; i++) 
              {
                  uint256 amount = ((amountToSendOwners).mul(auctions[_auctionId].RoyaltyPercentages[i])) / 10000;
                  payable(auctions[_auctionId].RoyaltyReciver[i]).transfer(amount);
              }
              }else{
              uint256 RoyaltyFees = calculateRoyaltyFee(auctions[_auctionId].currentBidAmount , auctions[_auctionId].RoyaltyFee);
              uint256 ServiceFee = calulatePlatFormServiceFee(auctions[_auctionId].currentBidAmount, PlatFormServiceFee);
              uint256 totalfee =  ServiceFee + RoyaltyFees;
              uint256 amountToSendSeller = auctions[_auctionId].currentBidAmount.sub(totalfee);
              
              payable(MarketPlaceOwner).transfer(ServiceFee);
  
              for(uint i = 0 ; i< auctions[_auctionId].RoyaltyReciver.length ; i++){  
  
              uint256 amount = ((RoyaltyFees).mul(auctions[_auctionId].RoyaltyPercentages[i])) / 10000;
              payable(auctions[_auctionId].RoyaltyReciver[i]).transfer(amount);
                  
              }
              payable(auctions[_auctionId].nftOwner).transfer(amountToSendSeller);
              }
  
              IERC1155Upgradeable(auctions[_auctionId].nftAddress).safeTransferFrom(
                  address(this),
                  auctions[_auctionId].currentBidOwner,
                  auctions[_auctionId].tokenId,
                  auctions[_auctionId].numberofcopies,
                  '0x00'
                  );
              
              auctions[_auctionId].isSold = true;
              auctions[_auctionId].OpenForBidding = false;
              isAuctionEnded[_auctionId] = true;
  
              emit AuctionEnded(highestBidder , highestBid);
              emit auctionend(_auctionId , auctions[_auctionId].tokenId , auctions[_auctionId].nftOwner , auctions[_auctionId].currentBidOwner);
          }
          
      }
  
      function auctionEnd(uint256 _auctionId) public 
      {
          require(_auctionId >= 0,"inavlid auction id");
          require(msg.sender == auctions[_auctionId].nftOwner , "Only the seller of NFT can end this auction");
          
          if(isAuctionEnded[_auctionId])
          {
              revert("You have already ended the auction");
          }
  
          if(!isBidPlaced[_auctionId])
          {
              revert("Can not end the auction because no bid place , go to cancelAuction to remove your item from the listing");
          
          }else
          {
              address tokenOwner = IMC(auctions[_auctionId].nftAddress).getTokenMinter(auctions[_auctionId].tokenId);
  
              if(auctions[_auctionId].nftOwner == tokenOwner){
              uint256 ServiceFees = calulatePlatFormServiceFee(auctions[_auctionId].currentBidAmount, PlatFormServiceFee);
              uint256 amountToSendOwners = (auctions[_auctionId].currentBidAmount).sub(ServiceFees); 
  
              for (uint256 i = 0; i < auctions[_auctionId].RoyaltyReciver.length; i++) 
              {
                  uint256 amount = ((amountToSendOwners).mul(auctions[_auctionId].RoyaltyPercentages[i])) / 10000;
                  payable(auctions[_auctionId].RoyaltyReciver[i]).transfer(amount);
              }
              }else{
              uint256 RoyaltyFees = calculateRoyaltyFee(auctions[_auctionId].currentBidAmount , auctions[_auctionId].RoyaltyFee);
              uint256 ServiceFee = calulatePlatFormServiceFee(auctions[_auctionId].currentBidAmount, PlatFormServiceFee);
              uint256 totalfee =  ServiceFee + RoyaltyFees;
              uint256 amountToSendSeller = auctions[_auctionId].currentBidAmount.sub(totalfee);
              
              payable(MarketPlaceOwner).transfer(ServiceFee);
  
              for(uint i = 0 ; i< auctions[_auctionId].RoyaltyReciver.length ; i++){  
  
              uint256 amount = ((RoyaltyFees).mul(auctions[_auctionId].RoyaltyPercentages[i])) / 10000;
              payable(auctions[_auctionId].RoyaltyReciver[i]).transfer(amount);
                  
              }
              payable(auctions[_auctionId].nftOwner).transfer(amountToSendSeller);
              }
  
              IERC1155Upgradeable(auctions[_auctionId].nftAddress).safeTransferFrom(
                  address(this),
                  auctions[_auctionId].currentBidOwner,
                  auctions[_auctionId].tokenId,
                  auctions[_auctionId].numberofcopies,
                  '0x00'
                  );
              
              auctions[_auctionId].isSold = true;
              auctions[_auctionId].OpenForBidding = false;
              isAuctionEnded[_auctionId] = true;
  
              emit AuctionEnded(highestBidder , highestBid);
              emit auctionend(_auctionId , auctions[_auctionId].tokenId , auctions[_auctionId].nftOwner , auctions[_auctionId].currentBidOwner);
          }
          
      }
  
  
      //send nfts to the owner of the 
      function sendNFTToOwner() internal returns(bool){
          for (uint i = 0; i < auctions.length; i++) {
              if(block.timestamp >= auctions[i].auctionEndTime && auctions[i].OpenForBidding == true && auctions[i].currentBidOwner != address(0)){
                  endExpiredAuction(auctions[i].auctionid);
              }
          }
          return true;
      }
  
      mapping(uint256=>bool) private isNftCancellForLsiting;
  
      function cancellListingForFixedPRice(uint256 listingID) public  returns(string memory resp)
      {
          require(msg.sender == Fixedprices[listingID].owner , "You are not the owner");
          // require(Fixedprices[listingID].isSold , "NFT is already sold , can not perform this action now"); // NFT already Sold , can not 
  
          if(Fixedprices[listingID].isSold == true)
          {
              revert("NFT is already sold , can not perform this action now");
          }    
  
  
          if(Fixedprices[listingID].forsale == true)
          {
              IERC1155Upgradeable(Fixedprices[listingID].nftAddress).safeTransferFrom(address(this),msg.sender,Fixedprices[listingID].tokenid,Fixedprices[listingID].totalcopies , '0x00');
             
      
              Fixedprices[listingID].isSold = false;
              Fixedprices[listingID].listing = false;
              Fixedprices[listingID].forsale = false;
              Fixedprices[listingID].owner = address(0);
              Fixedprices[listingID].newowner = address(0);
              Fixedprices[listingID].price = 0;
              Fixedprices[listingID].paid = 0;
              Fixedprices[listingID].fixedid = listingID;
              Fixedprices[listingID].nftAddress = address(0);
              Fixedprices[listingID].tokenid = 0;
              Fixedprices[listingID].totalcopies = 0;
              Fixedprices[listingID].RoyaltyFee = 0;
              Fixedprices[listingID].RoyaltyReciver = new address[](0);
  
              isAuctionListedCancelled[listingID] = true;
              emit cancelFixedPriceListing(listingID,Fixedprices[listingID].tokenid,Fixedprices[listingID].owner,Fixedprices[listingID].totalcopies);
  
              
              return("Cancell listing item done successfully ! ");
          }
          else{
              revert("You don't have any listed item for cancelling");
          }
      }
  
  
      function cancelAuction(uint256 listingID) public returns(string memory resp)
      {
          require(msg.sender == auctions[listingID].nftOwner , "You are not the owner");
          require(isAuctionEnded[listingID] , "NFT is alrady Removed from the listing , you can not perform this action" );
          if(auctions[listingID].isSold)
          {
              revert("NFT is alrady sold , can not perform this action now");
          }
          
          if(auctions[listingID].OpenForBidding == true && isBidPlaced[listingID] == false)
          {
            IERC1155Upgradeable(auctions[listingID].nftAddress).safeTransferFrom(address(this),auctions[listingID].nftOwner,auctions[listingID].tokenId,auctions[listingID].numberofcopies , '0x00');
             
                  
             auctions[listingID].isSold = false;
             auctions[listingID].OpenForBidding = false;
             auctions[listingID].initialPrice = 0;
             auctions[listingID].auctionid = 0;
             auctions[listingID].tokenId = 0;
             auctions[listingID].numberofcopies = 0;
             auctions[listingID].auctionEndTime = 0;
             auctions[listingID].auctionStartTime = 0;
             auctions[listingID].currentBidAmount = 0;
             auctions[listingID].currentBidOwner = address(0);
             auctions[listingID].nftAddress = address(0);
             auctions[listingID].nftOwner = address(0);
  
              isAuctionListedCancelled[listingID] = true;
              emit cancellAuction(listingID,auctions[listingID].tokenId,auctions[listingID].nftOwner,auctions[listingID].numberofcopies);
              
              return("Cancell listing item done successfully ! ");
          }
          else{
              revert("You can not remove the item from auction , since the bid is placed.");
          }
  
      }
  
  
      function getAllBids(uint256 _listingid) public view returns(bidStruct memory) {
          return bids[_listingid];
      }
  
      function getBidsTime(uint256 _listingid) public view returns(uint256[] memory) {
          return bids[_listingid].addedAt;
      }
  
      function getBidders(uint256 _listingid) public view returns(address[] memory) {
          return bids[_listingid].bidder;
      }
  
      function getAllAuctions() public view returns(uint256){
          return auctions.length;
      }
  
      function getAllFixedPrices() public view returns(uint256){
          return Fixedprices.length;
      }
  
      function pause() public onlyOwner {
          _pause();
      }
  
      function unpause() public onlyOwner {
          _unpause();
      }
  
      function _authorizeUpgrade(address newImplementation)
          internal
          onlyOwner
          override
      {} 
  
  }