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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;
pragma abicoder v2;

// OpenZeppelin v4
import { StorageSlot } from "@openzeppelin/contracts/utils/StorageSlot.sol";
import { Address } from "@openzeppelin/contracts/utils/Address.sol";

/**
 * @title PausableUpgradableProxy
 * @author Railgun Contributors
 * @notice Delegates calls to implementation address
 * @dev Calls are reverted if the contract is paused
 */
contract PausableUpgradableProxy {
  // Storage slot locations
  bytes32 private constant IMPLEMENTATION_SLOT = bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1);
  bytes32 private constant ADMIN_SLOT = bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1);
  bytes32 private constant PAUSED_SLOT = bytes32(uint256(keccak256("eip1967.proxy.paused")) - 1);

  // Events
  event ProxyUpgrade(address previousImplementation, address newImplementation);
  event ProxyOwnershipTransfer(address previousOwner, address newOwner);
  event ProxyPause();
  event ProxyUnpause();

  /**
   * @notice Sets initial specified admin value
   * Implementation is set as 0x0 and contract is created as paused
   * @dev Implementation must be set before unpausing
   */

  constructor(address _admin) {
    // Set initial value for admin
    StorageSlot.getAddressSlot(ADMIN_SLOT).value = _admin;

    // Explicitly initialize implementation as 0
    StorageSlot.getAddressSlot(IMPLEMENTATION_SLOT).value = address(0);

    // Explicitly initialize as paused
    StorageSlot.getBooleanSlot(PAUSED_SLOT).value = true;
  }

  /**
   * @notice Reverts if proxy is paused
   */

  modifier notPaused() {
    // Revert if the contract is paused
    require(!StorageSlot.getBooleanSlot(PAUSED_SLOT).value, "Proxy: Contract is paused");
    _;
  }

  /**
   * @notice Delegates call to implementation
   */

  function delegate() internal notPaused {
    // Get implementation
    address implementation = StorageSlot.getAddressSlot(IMPLEMENTATION_SLOT).value;

    // Check that implementation exists
    require(Address.isContract(implementation), "Proxy: Implementation doesn't exist");

    // solhint-disable-next-line no-inline-assembly
    assembly {
      // Copy msg.data. We take full control of memory in this inline assembly
      // block because it will not return to Solidity code. We overwrite the
      // Solidity scratch pad at memory position 0.
      calldatacopy(0, 0, calldatasize())

      // Call the implementation.
      // out and outsize are 0 because we don't know the size yet.
      let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

      // Copy the returned data.
      returndatacopy(0, 0, returndatasize())

      switch result
      // delegatecall returns 0 on error.
      case 0 { revert(0, returndatasize()) }
      default { return(0, returndatasize()) }
    }
  }

  /**
   * @notice Prevents calls unless caller is owner
   * @dev This should be on all external/public functions that aren't the fallback
   */

  modifier onlyOwner() {
    if (msg.sender == StorageSlot.getAddressSlot(ADMIN_SLOT).value) {
      _;
    } else {
      // Redirect to delegate if caller isn't owner
      delegate();
    }
  }

  /**
   * @notice fallback function that delegates calls with calladata
   */
  fallback() external payable {
    delegate();
  }

  /**
   * @notice fallback function that delegates calls with no calladata
   */
  receive() external payable {
    delegate();
  }

  /**
   * @notice Transfers ownership to new address
   * @param _newOwner - Address to transfer ownership to
   */
  function transferOwnership(address _newOwner) external onlyOwner {
    require(_newOwner != address(0), "Proxy: Preventing potential accidental burn");

    // Get admin slot
    StorageSlot.AddressSlot storage admin = StorageSlot.getAddressSlot(ADMIN_SLOT);

    // Emit event
    emit ProxyOwnershipTransfer(admin.value, _newOwner);

    // Store new admin
    admin.value = _newOwner;
  }

  /**
   * @notice Upgrades implementation
   * @param _newImplementation - Address of the new implementation
   */
  function upgrade(address _newImplementation) external onlyOwner {
    // Get implementation slot
    StorageSlot.AddressSlot storage implementation = StorageSlot.getAddressSlot(IMPLEMENTATION_SLOT);

    // If new implementation is identical to old, skip
    if (implementation.value != _newImplementation) {
      // Emit event
      emit ProxyUpgrade(implementation.value, _newImplementation);

      // Store new implementation
      implementation.value = _newImplementation;
    }
  }

  /**
   * @notice Pauses contract
   */
  function pause() external onlyOwner  {
    // Get paused slot
    StorageSlot.BooleanSlot storage paused = StorageSlot.getBooleanSlot(PAUSED_SLOT);

    // If not already paused, pause
    if (!paused.value) {
      // Set paused to true
      paused.value = true;

      // Emit paused event
      emit ProxyPause();
    }
  }

  /**
   * @notice Unpauses contract
   */
  function unpause() external onlyOwner {
    // Get paused slot
    StorageSlot.BooleanSlot storage paused = StorageSlot.getBooleanSlot(PAUSED_SLOT);

    // If already unpaused, do nothing
    if (paused.value) {
      // Set paused to true
      paused.value = false;

      // Emit paused event
      emit ProxyUnpause();
    }
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/StorageSlot.sol)

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 StorageSlot {
    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) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

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

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1600
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_admin","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"ProxyOwnershipTransfer","type":"event"},{"anonymous":false,"inputs":[],"name":"ProxyPause","type":"event"},{"anonymous":false,"inputs":[],"name":"ProxyUnpause","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousImplementation","type":"address"},{"indexed":false,"internalType":"address","name":"newImplementation","type":"address"}],"name":"ProxyUpgrade","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newImplementation","type":"address"}],"name":"upgrade","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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0000000000000000000000003c53c163c2ece58470ee219e647f18d133885c3a

-----Decoded View---------------
Arg [0] : _admin (address): 0x3c53C163C2EcE58470ee219E647f18D133885C3A

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000003c53c163c2ece58470ee219e647f18d133885c3a