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// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.6;

import {IMirrorWriteRaceOracle} from "./interface/IMirrorWriteRaceOracle.sol";
import {Ownable} from "../lib/Ownable.sol";

/**
 * @title MirrorWriteRaceOracle
 * @author MirrorXYZ
 */
contract MirrorWriteRaceOracle is IMirrorWriteRaceOracle, Ownable {
    /// @notice Merkle root
    bytes32 public root;

    constructor(address owner_, bytes32 root_) Ownable(owner_) {
        root = root_;
    }

    function updateRoot(bytes32 newRoot) public override onlyOwner {
        root = newRoot;
    }

    /**
     * @notice verifies that an account has participated in the Write Race.
     * see: https://github.com/protofire/zeppelin-solidity/blob/master/contracts/MerkleProof.sol
     */
    function verify(
        address account,
        uint256 index,
        bytes32[] memory proof
    ) public view override returns (bool) {
        bytes32 computedHash = getNode(account, index);

        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];

            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(
                    abi.encodePacked(computedHash, proofElement)
                );
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(
                    abi.encodePacked(proofElement, computedHash)
                );
            }
        }

        // Check if the computed hash (root) is equal to the provided root
        return computedHash == root;
    }

    function getNode(address account, uint256 index)
        private
        pure
        returns (bytes32)
    {
        return keccak256(abi.encodePacked(account, index));
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.6;

/**
 * @title IMirrorWriteRaceOracle
 * @author MirrorXYZ
 */
interface IMirrorWriteRaceOracle {
    event UpdatedRoot(bytes32 oldRoot, bytes32 newRoot);

    function updateRoot(bytes32 newRoot) external;

    function verify(
        address account,
        uint256 index,
        bytes32[] memory proof
    ) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.6;

contract Ownable {
    address public owner;
    address private nextOwner;

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

    // modifiers

    modifier onlyOwner() {
        require(isOwner(), "caller is not the owner.");
        _;
    }

    modifier onlyNextOwner() {
        require(isNextOwner(), "current owner must set caller as next owner.");
        _;
    }

    /**
     * @dev Initialize contract by setting transaction submitter as initial owner.
     */
    constructor(address owner_) {
        owner = owner_;
        emit OwnershipTransferred(address(0), owner);
    }

    /**
     * @dev Initiate ownership transfer by setting nextOwner.
     */
    function transferOwnership(address nextOwner_) external onlyOwner {
        require(nextOwner_ != address(0), "Next owner is the zero address.");

        nextOwner = nextOwner_;
    }

    /**
     * @dev Cancel ownership transfer by deleting nextOwner.
     */
    function cancelOwnershipTransfer() external onlyOwner {
        delete nextOwner;
    }

    /**
     * @dev Accepts ownership transfer by setting owner.
     */
    function acceptOwnership() external onlyNextOwner {
        delete nextOwner;

        owner = msg.sender;

        emit OwnershipTransferred(owner, msg.sender);
    }

    /**
     * @dev Renounce ownership by setting owner to zero address.
     */
    function renounceOwnership() external onlyOwner {
        owner = address(0);

        emit OwnershipTransferred(owner, address(0));
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == owner;
    }

    /**
     * @dev Returns true if the caller is the next owner.
     */
    function isNextOwner() public view returns (bool) {
        return msg.sender == nextOwner;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 2000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"owner_","type":"address"},{"internalType":"bytes32","name":"root_","type":"bytes32"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"oldRoot","type":"bytes32"},{"indexed":false,"internalType":"bytes32","name":"newRoot","type":"bytes32"}],"name":"UpdatedRoot","type":"event"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"cancelOwnershipTransfer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"isNextOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"root","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"nextOwner_","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"newRoot","type":"bytes32"}],"name":"updateRoot","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"bytes32[]","name":"proof","type":"bytes32[]"}],"name":"verify","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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0000000000000000000000002330ee705ffd040bb0cba8cb7734dfe00e7c4b57f760f48a911881d432e210cdd6b2d0e92fff6c6a829d403da60052e5e718f048

-----Decoded View---------------
Arg [0] : owner_ (address): 0x2330ee705fFD040bB0cbA8CB7734Dfe00E7C4b57
Arg [1] : root_ (bytes32): 0xf760f48a911881d432e210cdd6b2d0e92fff6c6a829d403da60052e5e718f048

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000002330ee705ffd040bb0cba8cb7734dfe00e7c4b57
Arg [1] : f760f48a911881d432e210cdd6b2d0e92fff6c6a829d403da60052e5e718f048