// File: Delegate.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.16;

import "./Ownable.sol";

import "./TokenHelper.sol";
import "./NativeReceiver.sol";

import "./SimpleInitializable.sol";

import "./IWithdrawable.sol";
import "./Withdrawable.sol";

import "./IDelegate.sol";

contract Delegate is IDelegate, SimpleInitializable, Ownable, Withdrawable, NativeReceiver {
    constructor() {
        _initializeWithSender();
    }

    function _initialize() internal override {
        _transferOwnership(initializer());
    }

    function setOwner(address newOwner_) external whenInitialized onlyInitializer {
        _transferOwnership(newOwner_);
    }

    function _checkWithdraw() internal view override {
        _ensureInitialized();
        _checkOwner();
    }
}

// File: IDelegate.sol



// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.8.16;

import "./IOwnable.sol";

import "./ISimpleInitializable.sol";

import "./IWithdrawable.sol";

import "./IOwnershipManageable.sol";

// solhint-disable-next-line no-empty-blocks
interface IDelegate is ISimpleInitializable, IOwnable, IWithdrawable, IOwnershipManageable {

}

// File: Withdrawable.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.16;

import "./TokenHelper.sol";

import "./IWithdrawable.sol";

abstract contract Withdrawable is IWithdrawable {
    function withdraw(Withdraw[] calldata withdraws_) external virtual {
        _checkWithdraw();

        for (uint256 i = 0; i < withdraws_.length; i++) {
            Withdraw calldata w = withdraws_[i];
            TokenHelper.transferFromThis(w.token, w.to, w.amount);
            emit Withdrawn(w.token, w.amount, w.to);
        }
    }

    function _checkWithdraw() internal view virtual;
}

// File: IWithdrawable.sol



// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.8.16;

struct Withdraw {
    address token;
    uint256 amount;
    address to;
}

interface IWithdrawable {
    event Withdrawn(address token, uint256 amount, address to);

    function withdraw(Withdraw[] calldata withdraws) external;
}

// File: SimpleInitializable.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.16;

import "./ISimpleInitializable.sol";
import "./Initializable.sol";

abstract contract SimpleInitializable is ISimpleInitializable, Initializable {
    // bytes32 private constant _INITIALIZER_SLOT = bytes32(uint256(keccak256("Paxoswap.v2.SimpleInitializable._initializer")) - 1);
    bytes32 private constant _INITIALIZER_SLOT = 0x4c943a984a6327bfee4b36cd148236ae13d07c9a3fe7f9857f4809df3e826db1;

    // prettier-ignore
    constructor()
        Initializable(_INITIALIZER_SLOT)
    {} // solhint-disable-line no-empty-blocks

    function initialize() public init {
        _initialize();
    }

    function _initialize() internal virtual;
}

// File: NativeReceiver.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.16;

abstract contract NativeReceiver {
    receive() external payable {} // solhint-disable-line no-empty-blocks
}

// File: TokenHelper.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.16;

import "./IERC20.sol";
import "./draft-IERC20Permit.sol";
import "./SafeERC20.sol";
import "./Address.sol";
import "./ECDSA.sol";

import "./NativeClaimer.sol";

library TokenHelper {
    using SafeERC20 for IERC20;
    using SafeERC20 for IERC20Permit;
    using Address for address;
    using Address for address payable;
    using NativeClaimer for NativeClaimer.State;

    /**
     * @dev Paxoswap's native coin representation.
     */
    address public constant NATIVE_TOKEN = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    modifier whenNonZero(uint256 amount_) {
        if (amount_ == 0) {
            return;
        }
        _;
    }

    function isNative(address token_) internal pure returns (bool) {
        return token_ == NATIVE_TOKEN;
    }

    function balanceOf(
        address token_,
        address owner_,
        NativeClaimer.State memory claimer_
    ) internal view returns (uint256 balance) {
        if (isNative(token_)) {
            balance = _nativeBalanceOf(owner_, claimer_);
        } else {
            balance = IERC20(token_).balanceOf(owner_);
        }
    }

    function balanceOfThis(
        address token_,
        NativeClaimer.State memory claimer_
    ) internal view returns (uint256 balance) {
        balance = balanceOf(token_, _this(), claimer_);
    }

    function transferToThis(
        address token_,
        address from_,
        uint256 amount_,
        NativeClaimer.State memory claimer_
    ) internal whenNonZero(amount_) {
        if (isNative(token_)) {
            // We cannot claim native coins of an arbitrary "from_" address
            // like we do with ERC-20 allowance. So the only way to use native
            // is to pass via "value" with the contract call. The "from_" address
            // does not participate in such a scenario. The only thing we can do
            // is to restrict caller to be "from_" address only.
            require(from_ == _sender(), "TH: native allows sender only");
            claimer_.claim(amount_);
        } else {
            IERC20(token_).safeTransferFrom(from_, _this(), amount_);
        }
    }

    function transferFromThis(address token_, address to_, uint256 amount_) internal whenNonZero(amount_) {
        if (isNative(token_)) {
            _nativeTransferFromThis(to_, amount_);
        } else {
            IERC20(token_).safeTransfer(to_, amount_);
        }
    }

    function approveOfThis(
        address token_,
        address spender_,
        uint256 amount_
    ) internal whenNonZero(amount_) returns (uint256 sendValue) {
        if (isNative(token_)) {
            sendValue = amount_;
        } else {
            sendValue = 0;
            IERC20(token_).safeApprove(spender_, amount_);
        }
    }

    function revokeOfThis(address token_, address spender_) internal {
        if (!isNative(token_)) {
            IERC20(token_).safeApprove(spender_, 0);
        }
    }

    function _nativeBalanceOf(
        address owner_,
        NativeClaimer.State memory claimer_
    ) private view returns (uint256 balance) {
        if (owner_ == _sender()) {
            balance = claimer_.unclaimed();
        } else {
            balance = owner_.balance;
            if (owner_ == _this()) {
                balance -= claimer_.unclaimed();
            }
        }
    }

    function _nativeTransferFromThis(address to_, uint256 amount_) private whenNonZero(amount_) {
        payable(to_).sendValue(amount_);
    }

    function _this() private view returns (address) {
        return address(this);
    }

    function _sender() private view returns (address) {
        return msg.sender;
    }
}

// File: Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

/**
 * @dev Paxoswap modifications of original OpenZeppelin's {Ownable} implementation:
 * - bump `pragma solidity` (`^0.8.0` -> `^0.8.16`)
 * - adjust OpenZeppelin's {Context} import (use `library` implementation)
 * - shortify `require` messages (`Ownable:` -> `OW:` + others to avoid length warnings)
 * - extract {IOwnable} interface
 */

pragma solidity ^0.8.16;

import "./IOwnable.sol";
import "./Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is IOwnable, Context {
    address private _owner;

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev See {IOwnable-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(), "OW: caller is not the owner");
    }

    /**
     * @dev See {IOwnable-renounceOwnership}
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev See {IOwnable-transferOwnership}
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "OW: new owner is zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: NativeClaimer.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.16;

library NativeClaimer {
    struct State {
        uint256 _valueClaimed;
    }

    function claimed(NativeClaimer.State memory claimer_) internal pure returns (uint256) {
        return claimer_._valueClaimed;
    }

    function unclaimed(NativeClaimer.State memory claimer_) internal view returns (uint256) {
        return msg.value - claimer_._valueClaimed;
    }

    function claim(NativeClaimer.State memory claimer_, uint256 value_) internal view {
        require(unclaimed(claimer_) >= value_, "NC: insufficient msg value");
        claimer_._valueClaimed += value_;
    }
}

// File: ECDSA.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/cryptography/ECDSA.sol)

/**
 * @dev Paxoswap modifications of original OpenZeppelin's {ECDSA} implementation:
 * - bump `pragma solidity` (`^0.8.0` -> `^0.8.16`)
 * - adjust OpenZeppelin's {Strings} import (use `library` implementation)
 * - shortify `require` messages (`ECDSA:` -> `EC:`)
 * - extract `decompress(bytes32 vs)` private function from `tryRecover(bytes32 hash, bytes32 r, bytes32 vs)`
 * - extract `tryDecompose(bytes memory signature)` private function from `tryRecover(bytes32 hash, bytes memory signature)`
 */

pragma solidity ^0.8.16;

import "./Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("EC: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("EC: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("EC: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("EC: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address signer, RecoverError err) {
        bytes32 r;
        bytes32 s;
        uint8 v;
        (r, s, v, err) = tryDecompose(signature);
        if (err == RecoverError.NoError) {
            (signer, err) = tryRecover(hash, v, r, s);
        }
    }

    /**
     * @dev Extracted from {ECDSA-tryRecover} (bytes32 hash, bytes memory signature) for Paxoswap needs
     */
    function tryDecompose(
        bytes memory signature
    ) internal pure returns (bytes32 r, bytes32 s, uint8 v, RecoverError err) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
        } else if (signature.length == 64) {
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            (s, v) = decompress(vs);
        } else {
            err = RecoverError.InvalidSignatureLength;
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError) {
        (bytes32 s, uint8 v) = decompress(vs);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Extracted from {ECDSA-tryRecover} (bytes32 hash, bytes32 r, bytes32 vs) for Paxoswap needs
     */
    function decompress(bytes32 vs) private pure returns (bytes32 s, uint8 v) {
        s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        v = uint8((uint256(vs) >> 255) + 27);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// File: Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

/**
 * @dev Paxoswap modifications of original OpenZeppelin's {Address} implementation:
 * - bump `pragma solidity` (`^0.8.1` -> `^0.8.16`)
 * - shortify `require` messages (`Address:` -> `AD:` + others to avoid length warnings)
 * - disable some `solhint` rules for the file
 */

/* solhint-disable avoid-low-level-calls */

pragma solidity ^0.8.16;

/**
 * @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, "AD: insufficient balance");

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

    /**
     * @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, "AD: low-level call fail");
    }

    /**
     * @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, "AD: low-level value call fail");
    }

    /**
     * @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, "AD: not enough 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, "AD: low-level static call fail");
    }

    /**
     * @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 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, "AD: low-level delegate call fail");
    }

    /**
     * @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) {
        (bool success, bytes memory returndata) = target.delegatecall(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), "AD: 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: SafeERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

/**
 * @dev Paxoswap modifications of original OpenZeppelin's {SafeERC20} implementation:
 * - bump `pragma solidity` (`^0.8.0` -> `^0.8.16`)
 * - adjust OpenZeppelin's {IERC20}, {IERC20Permit}, {Address} imports (use `library` implementation)
 * - shortify `require` messages (`SafeERC20:` -> `SE:` + others to avoid length warnings)
 */

pragma solidity ^0.8.16;

import "./IERC20.sol";
import "./draft-IERC20Permit.sol";
import "./Address.sol";

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

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

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

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

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

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SE: decreased allowance below 0");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SE: permit did not succeed");
    }

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

        bytes memory returndata = address(token).functionCall(data, "SE: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SE: ERC20 operation failed");
        }
    }
}

// File: draft-IERC20Permit.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

/**
 * @dev Paxoswap modifications of original OpenZeppelin's {IERC20Permit} implementation:
 * - bump `pragma solidity` (`^0.8.0` -> `^0.8.16`)
 */

pragma solidity ^0.8.16;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// File: IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

/**
 * @dev Paxoswap modifications of original OpenZeppelin's {IERC20} implementation:
 * - bump `pragma solidity` (`^0.8.0` -> `^0.8.16`)
 */

pragma solidity ^0.8.16;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// File: Initializable.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.16;

import "./IInitializable.sol";
import "./InitializableStorage.sol";

abstract contract Initializable is IInitializable, InitializableStorage {
    // prettier-ignore
    constructor(bytes32 initializerSlot_)
        InitializableStorage(initializerSlot_)
    {} // solhint-disable-line no-empty-blocks

    modifier whenInitialized() {
        _ensureInitialized();
        _;
    }

    modifier whenNotInitialized() {
        _ensureNotInitialized();
        _;
    }

    modifier init() {
        _ensureNotInitialized();
        _initializeWithSender();
        _;
    }

    modifier onlyInitializer() {
        require(msg.sender == initializer(), "IN: sender not initializer");
        _;
    }

    function initialized() public view returns (bool) {
        return initializer() != address(0);
    }

    function initializer() public view returns (address) {
        return _initializer();
    }

    function _ensureInitialized() internal view {
        require(initialized(), "IN: not initialized");
    }

    function _ensureNotInitialized() internal view {
        require(!initialized(), "IN: already initialized");
    }

    function _initializeWithSender() internal {
        _setInitializer(msg.sender);
    }
}

// File: ISimpleInitializable.sol



// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.8.16;

import "./IInitializable.sol";

interface ISimpleInitializable is IInitializable {
    function initialize() external;
}

// File: Context.sol



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

/**
 * @dev Paxoswap modifications of original OpenZeppelin's {Context} implementation:
 * - bump `pragma solidity` (`^0.8.0` -> `^0.8.16`)
 */

pragma solidity ^0.8.16;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: IOwnable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;

interface IOwnable {
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() external view returns (address);

    /**
     * @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() external;

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) external;
}

// File: IOwnershipManageable.sol



// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.8.16;

interface IOwnershipManageable {
    function setOwner(address newOwner) external;
}

// File: InitializableStorage.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.16;

import "./StorageSlot.sol";

abstract contract InitializableStorage {
    bytes32 private immutable _initializerSlot;

    constructor(bytes32 initializerSlot_) {
        _initializerSlot = initializerSlot_;
    }

    function _initializerStorage() private view returns (StorageSlot.AddressSlot storage) {
        return StorageSlot.getAddressSlot(_initializerSlot);
    }

    function _initializer() internal view returns (address) {
        return _initializerStorage().value;
    }

    function _setInitializer(address initializer_) internal {
        _initializerStorage().value = initializer_;
    }
}

// File: IInitializable.sol



// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.8.16;

interface IInitializable {
    function initialized() external view returns (bool);

    function initializer() external view returns (address);
}

// File: Strings.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

/**
 * @dev Paxoswap modifications of original OpenZeppelin's {Strings} implementation:
 * - bump `pragma solidity` (`^0.8.0` -> `^0.8.16`)
 */

pragma solidity ^0.8.16;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// File: StorageSlot.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/StorageSlot.sol)

/**
 * @dev Paxoswap modifications of original OpenZeppelin's {StorageSlot} implementation:
 * - bump `pragma solidity` (`^0.8.0` -> `^0.8.16`)
 */

pragma solidity ^0.8.16;

/**
 * @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) {
        /// @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
        }
    }
}