// File: contracts/automate/SmartTrade/Router.sol



// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.6;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "../../Storage.sol";
import "../../Balance.sol";
import "./IHandler.sol";

contract SmartTradeRouter is Ownable, Pausable {
  using SafeERC20 for IERC20;

  enum OrderStatus {
    Pending,
    Succeeded,
    Canceled
  }

  struct Order {
    uint256 id;
    address owner;
    OrderStatus status;
    address handler;
    bytes callData;
  }

  /// @notice Storage contract
  Storage public info;

  mapping(uint256 => Order) internal _orders;

  mapping(uint256 => mapping(address => uint256)) internal _orderBalances;

  uint256 public ordersCount;

  event StorageChanged(address indexed info);

  event HandlerAdded(address indexed handler);

  event HandlerRemoved(address indexed handler);

  event OrderCreated(uint256 indexed id, address indexed owner, address indexed handler);

  event OrderUpdated(uint256 indexed id);

  event OrderCanceled(uint256 indexed id);

  event OrderSuccessed(uint256 indexed id);

  constructor(address _info) {
    require(_info != address(0), "SmartTradeRouter::constructor: invalid storage contract address");

    info = Storage(_info);
  }

  function pause() external {
    address pauser = info.getAddress(keccak256("DFH:Pauser"));
    require(
      msg.sender == owner() || msg.sender == pauser,
      "SmartTradeRouter::pause: caller is not the owner or pauser"
    );
    _pause();
  }

  function unpause() external {
    address pauser = info.getAddress(keccak256("DFH:Pauser"));
    require(
      msg.sender == owner() || msg.sender == pauser,
      "SmartTradeRouter::unpause: caller is not the owner or pauser"
    );
    _unpause();
  }

  /**
   * @notice Change storage contract address.
   * @param _info New storage contract address.
   */
  function changeStorage(address _info) external onlyOwner {
    require(_info != address(0), "SmartTradeRouter::changeStorage: invalid storage contract address");

    info = Storage(_info);
    emit StorageChanged(_info);
  }

  /**
   * @return Current protocol commission.
   */
  function fee() public view returns (uint256) {
    uint256 feeUSD = info.getUint(keccak256("DFH:Fee:Automate:SmartTrade"));
    if (feeUSD == 0) return 0;

    (, int256 answer, , , ) = AggregatorV3Interface(info.getAddress(keccak256("DFH:Fee:PriceFeed"))).latestRoundData();
    require(answer > 0, "SmartTradeRouter::fee: invalid price feed response");

    return (feeUSD * 1e18) / uint256(answer);
  }

  function balanceOf(uint256 orderId, address token) public view returns (uint256) {
    return _orderBalances[orderId][token];
  }

  function deposit(
    uint256 orderId,
    address[] calldata tokens,
    uint256[] calldata amounts
  ) public whenNotPaused {
    require(_orders[orderId].owner != address(0), "SmartTradeRouter::deposit: undefined order");
    require(
      msg.sender == _orders[orderId].owner ||
        info.getBool(keccak256(abi.encodePacked("DFH:Contract:SmartTrade:allowedHandler:", msg.sender))),
      "SmartTradeRouter::deposit: foreign order"
    );
    require(tokens.length == amounts.length, "SmartTradeRouter::deposit: invalid amounts length");

    for (uint256 i = 0; i < tokens.length; i++) {
      require(tokens[i] != address(0), "SmartTradeRouter::deposit: invalid token contract address");
      if (amounts[i] == 0) continue;

      IERC20(tokens[i]).safeTransferFrom(msg.sender, address(this), amounts[i]);
      _orderBalances[orderId][tokens[i]] += amounts[i];
    }
  }

  function refund(
    uint256 orderId,
    address[] calldata tokens,
    uint256[] memory amounts,
    address recipient
  ) public whenNotPaused {
    require(
      msg.sender == _orders[orderId].owner ||
        msg.sender == owner() ||
        info.getBool(keccak256(abi.encodePacked("DFH:Contract:SmartTrade:allowedHandler:", msg.sender))),
      "SmartTradeRouter::refund: foreign order"
    );
    require(tokens.length == amounts.length, "SmartTradeRouter::refund: invalid amounts length");

    for (uint256 i = 0; i < tokens.length; i++) {
      require(tokens[i] != address(0), "SmartTradeRouter::refund: invalid token contract address");
      if (amounts[i] == 0) continue;
      require(balanceOf(orderId, tokens[i]) >= amounts[i], "SmartTradeRouter::refund: insufficient balance");

      _orderBalances[orderId][tokens[i]] -= amounts[i];
      IERC20(tokens[i]).safeTransfer(recipient, amounts[i]);
    }
  }

  function order(uint256 id) public view returns (Order memory) {
    return _orders[id];
  }

  function createOrder(
    address handler,
    bytes calldata callData,
    address[] calldata tokens,
    uint256[] calldata amounts
  ) external payable whenNotPaused returns (uint256) {
    require(
      info.getBool(keccak256(abi.encodePacked("DFH:Contract:SmartTrade:allowedHandler:", handler))),
      "SmartTradeRouter::createOrder: invalid handler address"
    );

    ordersCount++;
    Order storage newOrder = _orders[ordersCount];
    newOrder.id = ordersCount;
    newOrder.owner = msg.sender;
    newOrder.status = OrderStatus.Pending;
    newOrder.handler = handler;
    newOrder.callData = callData;
    emit OrderCreated(newOrder.id, newOrder.owner, newOrder.handler);
    IHandler(newOrder.handler).onOrderCreated(newOrder);

    if (tokens.length > 0) {
      deposit(newOrder.id, tokens, amounts);
    }

    if (msg.value > 0) {
      address balance = info.getAddress(keccak256("DFH:Contract:Balance"));
      require(balance != address(0), "SmartTradeRouter::createOrder: invalid balance contract address");

      Balance(balance).deposit{value: msg.value}(newOrder.owner);
    }

    return newOrder.id;
  }

  function updateOrder(uint256 id, bytes calldata callData) external whenNotPaused {
    Order storage _order = _orders[id];
    require(_order.owner != address(0), "SmartTradeRouter::updateOrder: undefined order");
    require(msg.sender == _order.owner || msg.sender == owner(), "SmartTradeRouter::updateOrder: forbidden");
    require(_order.status == OrderStatus.Pending, "SmartTradeRouter::updateOrder: order has already been processed");

    _order.callData = callData;
    emit OrderUpdated(id);
  }

  function cancelOrder(uint256 id, address[] calldata refundTokens) external {
    Order storage _order = _orders[id];
    require(_order.owner != address(0), "SmartTradeRouter::cancelOrder: undefined order");
    require(msg.sender == _order.owner || msg.sender == owner(), "SmartTradeRouter::cancelOrder: forbidden");
    require(_order.status == OrderStatus.Pending, "SmartTradeRouter::cancelOrder: order has already been processed");

    _order.status = OrderStatus.Canceled;
    emit OrderCanceled(_order.id);

    uint256[] memory refundAmounts = new uint256[](refundTokens.length);
    for (uint256 i = 0; i < refundTokens.length; i++) {
      refundAmounts[i] = _orderBalances[id][refundTokens[i]];
    }
    refund(id, refundTokens, refundAmounts, _order.owner);
  }

  function handleOrder(
    uint256 id,
    bytes calldata options,
    uint256 gasFee
  ) external whenNotPaused {
    Order storage _order = _orders[id];
    require(_order.owner != address(0), "SmartTradeRouter::handleOrder: undefined order");
    require(_order.status == OrderStatus.Pending, "SmartTradeRouter::handleOrder: order has already been processed");

    // solhint-disable-next-line avoid-tx-origin
    if (tx.origin != _order.owner) {
      address balance = info.getAddress(keccak256("DFH:Contract:Balance"));
      require(balance != address(0), "SmartTradeRouter::handleOrder: invalid balance contract address");
      Balance(balance).claim(_order.owner, gasFee, fee(), "SmartTradeHandle");
    }

    IHandler(_order.handler).handle(_order, options);
    _order.status = OrderStatus.Succeeded;
    emit OrderSuccessed(id);
  }
}

// File: @openzeppelin/contracts/access/Ownable.sol



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

pragma solidity ^0.8.0;

import "../utils/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 Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

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

    /**
     * @dev 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);
    }
}

// File: @openzeppelin/contracts/security/Pausable.sol



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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @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 Pausable is Context {
    /**
     * @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.
     */
    constructor() {
        _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());
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



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

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/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),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

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

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    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, "SafeERC20: 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, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

  function description() external view returns (string memory);

  function version() external view returns (uint256);

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}

// File: contracts/Storage.sol



// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.6;

import "@openzeppelin/contracts/access/Ownable.sol";

contract Storage is Ownable {
  /// @dev Bytes storage.
  mapping(bytes32 => bytes) private _bytes;

  /// @dev Bool storage.
  mapping(bytes32 => bool) private _bool;

  /// @dev Uint storage.
  mapping(bytes32 => uint256) private _uint;

  /// @dev Int storage.
  mapping(bytes32 => int256) private _int;

  /// @dev Address storage.
  mapping(bytes32 => address) private _address;

  /// @dev String storage.
  mapping(bytes32 => string) private _string;

  event Updated(bytes32 indexed key);

  /**
   * @param key The key for the record
   */
  function getBytes(bytes32 key) external view returns (bytes memory) {
    return _bytes[key];
  }

  /**
   * @param key The key for the record
   */
  function getBool(bytes32 key) external view returns (bool) {
    return _bool[key];
  }

  /**
   * @param key The key for the record
   */
  function getUint(bytes32 key) external view returns (uint256) {
    return _uint[key];
  }

  /**
   * @param key The key for the record
   */
  function getInt(bytes32 key) external view returns (int256) {
    return _int[key];
  }

  /**
   * @param key The key for the record
   */
  function getAddress(bytes32 key) external view returns (address) {
    return _address[key];
  }

  /**
   * @param key The key for the record
   */
  function getString(bytes32 key) external view returns (string memory) {
    return _string[key];
  }

  /**
   * @param key The key for the record
   * @param value The value to set.
   */
  function setBytes(bytes32 key, bytes calldata value) external onlyOwner {
    _bytes[key] = value;
    emit Updated(key);
  }

  /**
   * @param key The key for the record
   * @param value The value to set.
   */
  function setBool(bytes32 key, bool value) external onlyOwner {
    _bool[key] = value;
    emit Updated(key);
  }

  /**
   * @param key The key for the record
   * @param value The value to set.
   */
  function setUint(bytes32 key, uint256 value) external onlyOwner {
    _uint[key] = value;
    emit Updated(key);
  }

  /**
   * @param key The key for the record
   * @param value The value to set.
   */
  function setInt(bytes32 key, int256 value) external onlyOwner {
    _int[key] = value;
    emit Updated(key);
  }

  /**
   * @param key The key for the record
   * @param value The value to set.
   */
  function setAddress(bytes32 key, address value) external onlyOwner {
    _address[key] = value;
    emit Updated(key);
  }

  /**
   * @param key The key for the record
   * @param value The value to set.
   */
  function setString(bytes32 key, string calldata value) external onlyOwner {
    _string[key] = value;
    emit Updated(key);
  }

  /**
   * @param key The key for the record
   */
  function deleteBytes(bytes32 key) external onlyOwner {
    delete _bytes[key];
    emit Updated(key);
  }

  /**
   * @param key The key for the record
   */
  function deleteBool(bytes32 key) external onlyOwner {
    delete _bool[key];
    emit Updated(key);
  }

  /**
   * @param key The key for the record
   */
  function deleteUint(bytes32 key) external onlyOwner {
    delete _uint[key];
    emit Updated(key);
  }

  /**
   * @param key The key for the record
   */
  function deleteInt(bytes32 key) external onlyOwner {
    delete _int[key];
    emit Updated(key);
  }

  /**
   * @param key The key for the record
   */
  function deleteAddress(bytes32 key) external onlyOwner {
    delete _address[key];
    emit Updated(key);
  }

  /**
   * @param key The key for the record
   */
  function deleteString(bytes32 key) external onlyOwner {
    delete _string[key];
    emit Updated(key);
  }
}

// File: contracts/Balance.sol



// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.6;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";

contract Balance is Ownable {
  using EnumerableSet for EnumerableSet.AddressSet;

  /// @notice Maximum inspector count.
  uint256 public constant MAXIMUM_INSPECTOR_COUNT = 100;

  /// @notice Maximum consumer count.
  uint256 public constant MAXIMUM_CONSUMER_COUNT = 100;

  /// @notice Maximum accept or reject claims by one call.
  uint256 public constant MAXIMUM_CLAIM_PACKAGE = 500;

  /// @notice Treasury contract
  address payable public treasury;

  /// @dev Inspectors list.
  EnumerableSet.AddressSet internal _inspectors;

  /// @dev Consumers list.
  EnumerableSet.AddressSet internal _consumers;

  /// @notice Account balance.
  mapping(address => uint256) public balanceOf;

  /// @notice Account claim.
  mapping(address => uint256) public claimOf;

  /// @notice Possible statuses that a bill may be in.
  enum BillStatus {
    Pending,
    Accepted,
    Rejected
  }

  struct Bill {
    // Identificator.
    uint256 id;
    // Claimant.
    address claimant;
    // Target account.
    address account;
    // Claim gas fee.
    uint256 gasFee;
    // Claim protocol fee.
    uint256 protocolFee;
    // Current bill status.
    BillStatus status;
  }

  /// @notice Bills.
  mapping(uint256 => Bill) public bills;

  /// @notice Bill count.
  uint256 public billCount;

  event TreasuryChanged(address indexed treasury);

  event InspectorAdded(address indexed inspector);

  event InspectorRemoved(address indexed inspector);

  event ConsumerAdded(address indexed consumer);

  event ConsumerRemoved(address indexed consumer);

  event Deposit(address indexed recipient, uint256 amount);

  event Refund(address indexed recipient, uint256 amount);

  event Claim(address indexed account, uint256 indexed bill, string description);

  event AcceptClaim(uint256 indexed bill);

  event RejectClaim(uint256 indexed bill);

  constructor(address payable _treasury) {
    treasury = _treasury;
  }

  modifier onlyInspector() {
    require(_inspectors.contains(_msgSender()), "Balance: caller is not the inspector");
    _;
  }

  /**
   * @notice Change treasury contract address.
   * @param _treasury New treasury contract address.
   */
  function changeTreasury(address payable _treasury) external onlyOwner {
    treasury = _treasury;
    emit TreasuryChanged(treasury);
  }

  /**
   * @notice Add inspector.
   * @param inspector Added inspector.
   */
  function addInspector(address inspector) external onlyOwner {
    require(!_inspectors.contains(inspector), "Balance::addInspector: inspector already added");
    require(
      _inspectors.length() < MAXIMUM_INSPECTOR_COUNT,
      "Balance::addInspector: inspector must not exceed maximum count"
    );

    _inspectors.add(inspector);

    emit InspectorAdded(inspector);
  }

  /**
   * @notice Remove inspector.
   * @param inspector Removed inspector.
   */
  function removeInspector(address inspector) external onlyOwner {
    require(_inspectors.contains(inspector), "Balance::removeInspector: inspector already removed");

    _inspectors.remove(inspector);

    emit InspectorRemoved(inspector);
  }

  /**
   * @notice Get all inspectors.
   * @return All inspectors addresses.
   */
  function inspectors() external view returns (address[] memory) {
    address[] memory result = new address[](_inspectors.length());

    for (uint256 i = 0; i < _inspectors.length(); i++) {
      result[i] = _inspectors.at(i);
    }

    return result;
  }

  /**
   * @notice Add consumer.
   * @param consumer Added consumer.
   */
  function addConsumer(address consumer) external onlyOwner {
    require(!_consumers.contains(consumer), "Balance::addConsumer: consumer already added");
    require(
      _consumers.length() < MAXIMUM_CONSUMER_COUNT,
      "Balance::addConsumer: consumer must not exceed maximum count"
    );

    _consumers.add(consumer);

    emit ConsumerAdded(consumer);
  }

  /**
   * @notice Remove consumer.
   * @param consumer Removed consumer.
   */
  function removeConsumer(address consumer) external onlyOwner {
    require(_consumers.contains(consumer), "Balance::removeConsumer: consumer already removed");

    _consumers.remove(consumer);

    emit ConsumerRemoved(consumer);
  }

  /**
   * @notice Get all consumers.
   * @return All consumers addresses.
   */
  function consumers() external view returns (address[] memory) {
    address[] memory result = new address[](_consumers.length());

    for (uint256 i = 0; i < _consumers.length(); i++) {
      result[i] = _consumers.at(i);
    }

    return result;
  }

  /**
   * @notice Get net balance of account.
   * @param account Target account.
   * @return Net balance (balance minus claim).
   */
  function netBalanceOf(address account) public view returns (uint256) {
    return balanceOf[account] - claimOf[account];
  }

  /**
   * @notice Deposit ETH to balance.
   * @param recipient Target recipient.
   */
  function deposit(address recipient) external payable {
    require(recipient != address(0), "Balance::deposit: invalid recipient");
    require(msg.value > 0, "Balance::deposit: negative or zero deposit");

    balanceOf[recipient] += msg.value;

    emit Deposit(recipient, msg.value);
  }

  /**
   * @notice Refund ETH from balance.
   * @param amount Refunded amount.
   */
  function refund(uint256 amount) external {
    address payable recipient = payable(_msgSender());
    require(amount > 0, "Balance::refund: negative or zero refund");
    require(amount <= netBalanceOf(recipient), "Balance::refund: refund amount exceeds net balance");

    balanceOf[recipient] -= amount;
    // solhint-disable-next-line avoid-low-level-calls
    (bool sentRecipient, ) = recipient.call{value: amount}("");
    require(sentRecipient, "Balance::refund: transfer to the recipient failed");

    emit Refund(recipient, amount);
  }

  /**
   * @notice Send claim.
   * @param account Target account.
   * @param gasFee Claim gas fee.
   * @param protocolFee Claim protocol fee.
   * @param description Claim description.
   */
  function claim(
    address account,
    uint256 gasFee,
    uint256 protocolFee,
    string memory description
  ) external returns (uint256) {
    require(
      // solhint-disable-next-line avoid-tx-origin
      tx.origin == account || _consumers.contains(tx.origin),
      "Balance: caller is not a consumer"
    );

    uint256 amount = gasFee + protocolFee;
    require(amount > 0, "Balance::claim: negative or zero claim");
    require(amount <= netBalanceOf(account), "Balance::claim: claim amount exceeds net balance");

    claimOf[account] += amount;
    billCount++;
    bills[billCount] = Bill(billCount, _msgSender(), account, gasFee, protocolFee, BillStatus.Pending);
    emit Claim(account, billCount, description);

    return billCount;
  }

  /**
   * @notice Accept bills package.
   * @param _bills Target bills.
   * @param gasFees Confirmed claims gas fees by bills.
   * @param protocolFees Confirmed claims protocol fees by bills.
   */
  function acceptClaims(
    uint256[] memory _bills,
    uint256[] memory gasFees,
    uint256[] memory protocolFees
  ) external onlyInspector {
    require(
      _bills.length == gasFees.length && _bills.length == protocolFees.length,
      "Balance::acceptClaims: arity mismatch"
    );
    require(_bills.length <= MAXIMUM_CLAIM_PACKAGE, "Balance::acceptClaims: too many claims");

    uint256 transferredAmount;
    for (uint256 i = 0; i < _bills.length; i++) {
      uint256 billId = _bills[i];
      require(billId > 0 && billId <= billCount, "Balance::acceptClaims: bill not found");

      uint256 gasFee = gasFees[i];
      uint256 protocolFee = protocolFees[i];
      uint256 amount = gasFee + protocolFee;

      Bill storage bill = bills[billId];
      uint256 claimAmount = bill.gasFee + bill.protocolFee;
      require(bill.status == BillStatus.Pending, "Balance::acceptClaims: bill already processed");
      require(amount <= claimAmount, "Balance::acceptClaims: claim amount exceeds max fee");

      bill.status = BillStatus.Accepted;
      bill.gasFee = gasFee;
      bill.protocolFee = protocolFee;
      claimOf[bill.account] -= claimAmount;
      balanceOf[bill.account] -= amount;
      transferredAmount += amount;

      emit AcceptClaim(bill.id);
    }
    // solhint-disable-next-line avoid-low-level-calls
    (bool sentTreasury, ) = treasury.call{value: transferredAmount}("");
    require(sentTreasury, "Balance::acceptClaims: transfer to the treasury failed");
  }

  /**
   * @notice Reject bills package.
   * @param _bills Target bills.
   */
  function rejectClaims(uint256[] memory _bills) external onlyInspector {
    require(_bills.length < MAXIMUM_CLAIM_PACKAGE, "Balance::rejectClaims: too many claims");

    for (uint256 i = 0; i < _bills.length; i++) {
      uint256 billId = _bills[i];
      require(billId > 0 && billId <= billCount, "Balance::rejectClaims: bill not found");

      Bill storage bill = bills[billId];
      require(bill.status == BillStatus.Pending, "Balance::rejectClaims: bill already processed");
      uint256 amount = bill.gasFee + bill.protocolFee;

      bill.status = BillStatus.Rejected;
      claimOf[bill.account] -= amount;

      emit RejectClaim(bill.id);
    }
  }
}

// File: contracts/automate/SmartTrade/IHandler.sol



// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.6;

import "./Router.sol";

interface IHandler {
  function onOrderCreated(SmartTradeRouter.Order calldata order) external;

  function handle(SmartTradeRouter.Order calldata order, bytes calldata options) external;
}

// File: @openzeppelin/contracts/utils/Context.sol



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

pragma solidity ^0.8.0;

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

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

// File: @openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol



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

pragma solidity ^0.8.0;

/**
 * @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: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/utils/structs/EnumerableSet.sol



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

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 *  Trying to delete such a structure from storage will likely result in data corruption, rendering the structure unusable.
 *  See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 *  In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}