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// SPDX-License-Identifier: Apache License 2.0
pragma solidity ^0.8.13;

import "@openzeppelin/contracts/access/Ownable2Step.sol";

// We use a library for the `calculateRewards` function because the less code in
// `RewardsCollector` the less expensive it is to deploy the collector contract.
// We can call the library instead of deploying the library's code again and
// again.
library CalculateAndSendRewards {
    // Fee denominator, if `feeNominator = 500`,
    // the tax is 500/10000 = 5/100 = 5%.
    uint32 public constant FEE_DENOMINATOR = 10_000;
    event CollectedReward(
        address withdrawalCredential,
        uint256 withdrawnAmount,
        address feeRewardsManager,
        uint256 fee
    );

    function calculateAndSendRewards(
        uint32 feeNominator,
        address feeRewardsManager,
        address withdrawalCredential
    ) public {
        require(address(this).balance != 0, "Nothing to distribute");

        uint256 feeAmount = (address(this).balance * feeNominator) /
            FEE_DENOMINATOR;
        uint256 withdrawAmount = address(this).balance - feeAmount;
        emit CollectedReward(
            withdrawalCredential,
            withdrawAmount,
            feeRewardsManager,
            feeAmount
        );
        // This can be used to call this contract again (reentrancy) but since
        // all funds from this contract are used for the feeRewardsManager.
        (bool feeRewardsManagerSent, ) = payable(feeRewardsManager).call{
            value: feeAmount
        }("");
        require(
            feeRewardsManagerSent,
            "Failed to send Ether back to owner contract"
        );
        (bool sent, ) = payable(withdrawalCredential).call{
            value: withdrawAmount
        }("");
        require(sent, "Failed to send Ether back to withdrawal credential");
    }
}

contract RewardsCollector {
    // 1 - fee % will go to the user in this address.
    address public immutable withdrawalCredential;

    // Fee's numerator.
    uint32 public feeNumerator;

    // This is the contract that created the `RewardsCollector`.
    // Do not use owner here because this contract is going to be
    // created multiple times for each `withdrawal credential` and
    // we don't need any function for the ownership except when changing
    // the fee.
    address public immutable parentContract;

    // Allow receiving MEV and other rewards.
    receive() external payable {}

    function collectRewards() public payable {
        CalculateAndSendRewards.calculateAndSendRewards(
            feeNumerator,
            parentContract,
            withdrawalCredential
        );
    }

    constructor(address _withdrawalCredential) {
        withdrawalCredential = _withdrawalCredential;
        parentContract = msg.sender;
    }

    function changeFeeNumerator(uint32 _newFeeNumerator) public {
        require(
            msg.sender == parentContract,
            "ChangeFee not called from parent contract"
        );
        // Do not let fee be > 1 (with 10_000 denominator).
        require(_newFeeNumerator <= 10_000, "Invalid fee numerator");
        feeNumerator = _newFeeNumerator;
    }
}

contract FeeRewardsManager is Ownable2Step {
    uint32 public defaultFeeNumerator;

    constructor(uint32 _defaultFeeNumerator) Ownable(msg.sender) {
        // Do not let fee be > 1 (with 10_000 denominator).
        require(_defaultFeeNumerator <= 10_000, "Invalid fee numerator");
        defaultFeeNumerator = _defaultFeeNumerator;
    }

    event ContractDeployed(address contractAddress, uint32 feeNumerator);

    function changeDefaultFee(uint32 _newFeeNumerator) public onlyOwner {
        // Do not let fee be > 1 (with 10_000 denominator).
        require(_newFeeNumerator <= 10_000, "Invalid fee numerator");
        defaultFeeNumerator = _newFeeNumerator;
    }

    function createFeeContract(
        address _withdrawalCredential
    ) public returns (address payable) {
        bytes32 withdrawalCredentialBytes = bytes32(
            uint256(uint160(_withdrawalCredential))
        );
        // Uses CREATE2 opcode.
        RewardsCollector rewardsCollector = new RewardsCollector{
            salt: withdrawalCredentialBytes
        }(_withdrawalCredential);
        rewardsCollector.changeFeeNumerator(defaultFeeNumerator);
        emit ContractDeployed(address(rewardsCollector), defaultFeeNumerator);
        return payable(address(rewardsCollector));
    }

    // Predicts the address of a new contract that will be a `fee_recipient` of
    // an Ethereum validator.
    // Given the `_withdrawalCredential` we can instantiate a contract that will
    // be deployed at a deterministic address, calculated given the
    // `_withdrawalCredential`, the current contract address and the current
    // contract's bytecode.
    function predictFeeContractAddress(
        address _withdrawalCredential
    ) public view returns (address) {
        bytes memory bytecode = type(RewardsCollector).creationCode;
        bytecode = abi.encodePacked(
            bytecode,
            abi.encode(_withdrawalCredential)
        );
        bytes32 withdrawalCredentialBytes = bytes32(
            uint256(uint160(_withdrawalCredential))
        );
        bytes32 hash = keccak256(
            abi.encodePacked(
                bytes1(0xff),
                address(this),
                withdrawalCredentialBytes,
                keccak256(bytecode)
            )
        );
        return address(uint160(uint(hash)));
    }

    function changeFeeNumerator(
        address payable _feeContract,
        uint32 _newFee
    ) public onlyOwner {
        RewardsCollector(_feeContract).changeFeeNumerator(_newFee);
    }

    function batchCollectRewards(
        address payable[] calldata feeAddresses
    ) public {
        for (uint32 i = 0; i < feeAddresses.length; ++i) {
            RewardsCollector(feeAddresses[i]).collectRewards();
        }
    }

    receive() external payable {}

    // Withdraws Eth from the manager contract.
    function getEth(address addr) external onlyOwner {
        (bool sent, ) = payable(addr).call{value: address(this).balance}("");
        require(sent, "Failed to get Eth from contract");
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.20;

import {Ownable} from "./Ownable.sol";

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This extension of the {Ownable} contract includes a two-step mechanism to transfer
 * ownership, where the new owner must call {acceptOwnership} in order to replace the
 * old one. This can help prevent common mistakes, such as transfers of ownership to
 * incorrect accounts, or to contracts that are unable to interact with the
 * permission system.
 *
 * The initial owner is specified at deployment time in the constructor for `Ownable`. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

    /**
     * @dev Returns the address of the pending owner.
     */
    function pendingOwner() public view virtual returns (address) {
        return _pendingOwner;
    }

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        if (pendingOwner() != sender) {
            revert OwnableUnauthorizedAccount(sender);
        }
        _transferOwnership(sender);
    }
}

// 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 v5.0.1) (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/=lib/openzeppelin-contracts/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "ds-test/=lib/openzeppelin-contracts/lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "forge-std/=lib/openzeppelin-contracts/lib/forge-std/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": "paris",
  "viaIR": false,
  "libraries": {
    "src/FeeRewardsManager.sol": {
      "CalculateAndSendRewards": "0x8D03884EF3F39ec263F3D7c3954A868468ff8497"
    }
  }
}

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0000000000000000000000000000000000000000000000000000000000000af0

-----Decoded View---------------
Arg [0] : _defaultFeeNumerator (uint32): 2800

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000af0