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// SPDX-License-Identifier: MIT
pragma solidity 0.8.26;

import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {Pausable} from "@openzeppelin/contracts/utils/Pausable.sol";

interface IAshStaking {
    function notifyReward() external payable;
}

/// @title FeeSplitter (Hardened)
/// @notice Receives ETH trading fees from AshHook and splits them:
///         50% to treasury (pull-payment pattern)
///         50% to AshStaking (distributed to ASH stakers)
///
///         Set as the hook's treasury address via hook.setTreasury(thisAddress).
///         Auto-splits on receive. Manual split() and retrySplit() available.
///         Treasury uses pull-payment to eliminate reentrancy risk.
contract FeeSplitter is Ownable, Pausable {
    IAshStaking public stakingContract;
    address public treasury;

    uint256 public ownerBps = 5000;   // 50%
    uint256 public stakerBps = 5000;  // 50%
    uint256 public constant BASIS = 10000;

    // Pull-payment: treasury ETH accumulates here
    uint256 public treasuryBalance;

    // Failure tracking
    uint256 public failureCount;
    uint256 public lastFailureTimestamp;
    bytes public lastFailureReason;

    event Split(uint256 toTreasury, uint256 toStakers);
    event TreasuryWithdrawn(address indexed to, uint256 amount);
    event StakingContractUpdated(address indexed oldStaking, address indexed newStaking);
    event TreasuryUpdated(address indexed oldTreasury, address indexed newTreasury);
    event SplitRatioUpdated(uint256 ownerBps, uint256 stakerBps);
    event AutoSplitFailed(uint256 amount, bytes reason);
    event StakerRewardFailed(uint256 amount, bytes reason);

    error InvalidSplit();
    error NothingToSplit();
    error TransferFailed();
    error NothingToWithdraw();

    constructor(address _treasury, address _stakingContract) Ownable(msg.sender) {
        require(_treasury != address(0), "Invalid treasury");
        require(_stakingContract != address(0), "Invalid staking");
        treasury = _treasury;
        stakingContract = IAshStaking(_stakingContract);
    }

    /// @notice Distribute all pending ETH according to the split ratio.
    ///         Treasury portion goes to pull-payment balance.
    ///         Staker portion sent to AshStaking via notifyReward().
    function split() public whenNotPaused {
        // Calculate splittable balance (exclude treasury's pending withdrawal)
        uint256 balance = address(this).balance - treasuryBalance;
        if (balance == 0) revert NothingToSplit();

        uint256 toTreasury = (balance * ownerBps) / BASIS;
        uint256 toStakers = balance - toTreasury;

        // Pull-payment: accumulate treasury portion
        if (toTreasury > 0) {
            treasuryBalance += toTreasury;
        }

        // Push staker rewards to staking contract
        if (toStakers > 0) {
            try stakingContract.notifyReward{value: toStakers}() {
                // success
            } catch (bytes memory reason) {
                // If staking contract reverts (e.g., MinimumRewardRequired),
                // buffer the staker portion in treasury for now
                treasuryBalance += toStakers;
                failureCount++;
                lastFailureTimestamp = block.timestamp;
                lastFailureReason = reason;
                emit StakerRewardFailed(toStakers, reason);
            }
        }

        emit Split(toTreasury, toStakers);
    }

    /// @notice Treasury withdraws accumulated ETH (pull-payment).
    function treasuryWithdraw() external {
        if (treasuryBalance == 0) revert NothingToWithdraw();
        uint256 amount = treasuryBalance;
        treasuryBalance = 0;
        (bool ok,) = treasury.call{value: amount}("");
        if (!ok) revert TransferFailed();
        emit TreasuryWithdrawn(treasury, amount);
    }

    /// @notice Retry a failed split (admin recovery).
    function retrySplit() external onlyOwner {
        split();
    }

    /// @notice Accept ETH from hook. Does NOT auto-split because the hook
    ///         limits gas to 50k which isn't enough for split().
    ///         Call split() separately (anyone can call it).
    receive() external payable {}

    // ── Views ──

    function getSplitStatus() external view returns (bool failed, uint256 timestamp, uint256 attempts) {
        failed = failureCount > 0;
        timestamp = lastFailureTimestamp;
        attempts = failureCount;
    }

    function pendingSplit() external view returns (uint256) {
        return address(this).balance - treasuryBalance;
    }

    // ── Admin ──

    function setStakingContract(address _staking) external onlyOwner {
        require(_staking != address(0), "Invalid address");
        emit StakingContractUpdated(address(stakingContract), _staking);
        stakingContract = IAshStaking(_staking);
    }

    function setTreasury(address _treasury) external onlyOwner {
        require(_treasury != address(0), "Invalid address");
        emit TreasuryUpdated(treasury, _treasury);
        treasury = _treasury;
    }

    function setSplitRatio(uint256 _ownerBps, uint256 _stakerBps) external onlyOwner {
        if (_ownerBps + _stakerBps != BASIS) revert InvalidSplit();
        ownerBps = _ownerBps;
        stakerBps = _stakerBps;
        emit SplitRatioUpdated(_ownerBps, _stakerBps);
    }

    function pause() external onlyOwner { _pause(); }
    function unpause() external onlyOwner { _unpause(); }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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 {
    bool private _paused;

    /**
     * @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);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

    /**
     * @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 {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

    /**
     * @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());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

{
  "remappings": [
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "forge-std/=lib/forge-std/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "halmos-cheatcodes/=lib/openzeppelin-contracts/lib/halmos-cheatcodes/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": true
}

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IAshStaking","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"treasury","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"treasuryBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"treasuryWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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00000000000000000000000018189287bfbdf3bf5c6dc33052b764893c59c7cc0000000000000000000000006b07e2048bff3b5bd06693f2eca3c329321c94bb

-----Decoded View---------------
Arg [0] : _treasury (address): 0x18189287bFBdf3BF5C6Dc33052B764893C59c7cc
Arg [1] : _stakingContract (address): 0x6b07E2048BfF3B5bd06693F2ecA3C329321C94BB

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000018189287bfbdf3bf5c6dc33052b764893c59c7cc
Arg [1] : 0000000000000000000000006b07e2048bff3b5bd06693f2eca3c329321c94bb