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// SPDX-License-Identifier: AGPL-3.0

pragma solidity 0.8.17;

import "./interfaces/IPolygonZkEVMGlobalExitRoot.sol";
import "./lib/GlobalExitRootLib.sol";

/**
 * Contract responsible for managing the exit roots across multiple networks
 */
contract PolygonZkEVMGlobalExitRoot is IPolygonZkEVMGlobalExitRoot {
    // PolygonZkEVMBridge address
    address public immutable bridgeAddress;

    // Rollup contract address
    address public immutable rollupAddress;

    // Rollup exit root, this will be updated every time a batch is verified
    bytes32 public lastRollupExitRoot;

    // Mainnet exit root, this will be updated every time a deposit is made in mainnet
    bytes32 public lastMainnetExitRoot;

    // Store every global exit root: Root --> timestamp
    mapping(bytes32 => uint256) public globalExitRootMap;

    /**
     * @dev Emitted when the global exit root is updated
     */
    event UpdateGlobalExitRoot(
        bytes32 indexed mainnetExitRoot,
        bytes32 indexed rollupExitRoot
    );

    /**
     * @param _rollupAddress Rollup contract address
     * @param _bridgeAddress PolygonZkEVMBridge contract address
     */
    constructor(address _rollupAddress, address _bridgeAddress) {
        rollupAddress = _rollupAddress;
        bridgeAddress = _bridgeAddress;
    }

    /**
     * @notice Update the exit root of one of the networks and the global exit root
     * @param newRoot new exit tree root
     */
    function updateExitRoot(bytes32 newRoot) external {
        // Store storage variables into temporal variables since will be used multiple times
        bytes32 cacheLastRollupExitRoot = lastRollupExitRoot;
        bytes32 cacheLastMainnetExitRoot = lastMainnetExitRoot;

        if (msg.sender == bridgeAddress) {
            lastMainnetExitRoot = newRoot;
            cacheLastMainnetExitRoot = newRoot;
        } else if (msg.sender == rollupAddress) {
            lastRollupExitRoot = newRoot;
            cacheLastRollupExitRoot = newRoot;
        } else {
            revert OnlyAllowedContracts();
        }

        bytes32 newGlobalExitRoot = GlobalExitRootLib.calculateGlobalExitRoot(
            cacheLastMainnetExitRoot,
            cacheLastRollupExitRoot
        );

        // If it already exists, do not modify the timestamp
        if (globalExitRootMap[newGlobalExitRoot] == 0) {
            globalExitRootMap[newGlobalExitRoot] = block.timestamp;
            emit UpdateGlobalExitRoot(
                cacheLastMainnetExitRoot,
                cacheLastRollupExitRoot
            );
        }
    }

    /**
     * @notice Return last global exit root
     */
    function getLastGlobalExitRoot() public view returns (bytes32) {
        return
            GlobalExitRootLib.calculateGlobalExitRoot(
                lastMainnetExitRoot,
                lastRollupExitRoot
            );
    }
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity 0.8.17;

interface IBasePolygonZkEVMGlobalExitRoot {
    /**
     * @dev Thrown when the caller is not the allowed contracts
     */
    error OnlyAllowedContracts();

    function updateExitRoot(bytes32 newRollupExitRoot) external;

    function globalExitRootMap(
        bytes32 globalExitRootNum
    ) external returns (uint256);
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity 0.8.17;
import "./IBasePolygonZkEVMGlobalExitRoot.sol";

interface IPolygonZkEVMGlobalExitRoot is IBasePolygonZkEVMGlobalExitRoot {
    function getLastGlobalExitRoot() external view returns (bytes32);
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity 0.8.17;

/**
 * @dev A library that provides the necessary calculations to calculate the global exit root
 */
library GlobalExitRootLib {
    function calculateGlobalExitRoot(
        bytes32 mainnetExitRoot,
        bytes32 rollupExitRoot
    ) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked(mainnetExitRoot, rollupExitRoot));
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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