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// SPDX-License-Identifier: MIT
pragma solidity 0.8.20;

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

import {Address} from "@openzeppelin/contracts/utils/Address.sol";

/// @notice A simple app that sends a message to the remote PingPongApp, which will respond with a message back.
/// This app can be loaded with a native asset, which will be used to pay for the messages sent.
/// Note: we deal with uint256 chain IDs in this contract as the legacy MessageBus contract is using uint256 chain IDs.
contract LegacyPingPong is LegacyReceiver {
    uint256 internal constant MESSAGE_LENGTH = 32;
    uint256 internal constant DEFAULT_GAS_LIMIT = 500_000;
    uint256 public gasLimit;

    event GasLimitSet(uint256 gasLimit);
    event PingDisrupted(uint256 counter);
    event PingReceived(uint256 counter);
    event PingSent(uint256 counter);

    constructor(address owner_) LegacyReceiver(owner_) {
        _setGasLimit(DEFAULT_GAS_LIMIT);
    }

    /// @notice Enables the contract to accept native asset.
    receive() external payable {}

    /// @notice Allows the Owner to set the gas limit for the interchain messages.
    function setGasLimit(uint256 gasLimit_) external onlyOwner {
        _setGasLimit(gasLimit_);
    }

    /// @notice Allows the Owner to withdraw the native asset from the contract.
    function withdraw() external onlyOwner {
        Address.sendValue(payable(msg.sender), address(this).balance);
    }

    /// @notice Starts the ping-pong message exchange with the remote PingPongApp.
    function startPingPong(uint256 dstChainId, uint256 counter) external {
        _sendPingPongMessage({dstChainId: dstChainId, counter: counter, lowBalanceRevert: true});
    }

    /// @notice Returns the fee to send a single ping message to the remote PingPongApp.
    function getPingFee(uint256 dstChainId) public view returns (uint256) {
        return _getMessageFee({dstChainId: dstChainId, gasLimit: gasLimit, messageLen: MESSAGE_LENGTH});
    }

    /// @dev Handle the verified message.
    function _handleMessage(
        bytes32, // srcAddress
        uint256 srcChainId,
        bytes calldata message,
        address // executor
    )
        internal
        override
    {
        uint256 counter = abi.decode(message, (uint256));
        emit PingReceived(counter);
        if (counter > 0) {
            _sendPingPongMessage({dstChainId: srcChainId, counter: counter - 1, lowBalanceRevert: false});
        }
    }

    /// @dev Sends a message to the PingPongApp on the remote chain.
    /// If `counter > 0`, the remote app will respond with a message to this app, decrementing the counter.
    /// Once the counter reaches 0, the remote app will not respond.
    function _sendPingPongMessage(uint256 dstChainId, uint256 counter, bool lowBalanceRevert) internal {
        uint256 pingFee = getPingFee(dstChainId);
        if (address(this).balance < pingFee && !lowBalanceRevert) {
            emit PingDisrupted(counter);
            return;
        }
        bytes memory message = abi.encode(counter);
        _sendMessage({dstChainId: dstChainId, messageFee: pingFee, gasLimit: gasLimit, message: message});
        emit PingSent(counter);
    }

    /// @dev Sets the gas limit for the interchain messages.
    function _setGasLimit(uint256 gasLimit_) internal {
        gasLimit = gasLimit_;
        emit GasLimitSet(gasLimit_);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.20;

import {LegacyReceiverEvents} from "./events/LegacyReceiverEvents.sol";
import {ILegacyReceiver} from "./interfaces/ILegacyReceiver.sol";
import {IMessageBus} from "./interfaces/IMessageBus.sol";
import {LegacyOptionsLib} from "./libs/LegacyOptions.sol";

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

abstract contract LegacyReceiver is Ownable, LegacyReceiverEvents, ILegacyReceiver {
    address public messageBus;
    mapping(uint256 chainId => bytes32 trustedRemote) public trustedRemotes;

    error LegacyReceiver__BalanceBelowMin(uint256 actual, uint256 required);
    error LegacyReceiver__ChainIdNotRemote(uint256 chainId);
    error LegacyReceiver__CallerNotMessageBus(address caller);
    error LegacyReceiver__SrcCallerNotTrusted(uint256 chainId, bytes32 srcCaller);
    error LegacyReceiver__TrustedRemoteZeroAddress(uint256 chainId);

    constructor(address owner_) Ownable(owner_) {}

    function setMessageBus(address messageBus_) external onlyOwner {
        messageBus = messageBus_;
        emit MessageBusSet(messageBus_);
    }

    function setTrustedRemote(uint256 remoteChainId, bytes32 remoteApp) external onlyOwner {
        if (remoteChainId == block.chainid) {
            revert LegacyReceiver__ChainIdNotRemote(remoteChainId);
        }
        trustedRemotes[remoteChainId] = remoteApp;
        emit TrustedRemoteSet(remoteChainId, remoteApp);
    }

    function executeMessage(
        bytes32 srcAddress,
        uint256 srcChainId,
        bytes calldata message,
        address executor
    )
        external
    {
        if (msg.sender != messageBus) {
            revert LegacyReceiver__CallerNotMessageBus(msg.sender);
        }
        if (trustedRemotes[srcChainId] != srcAddress) {
            revert LegacyReceiver__SrcCallerNotTrusted(srcChainId, srcAddress);
        }
        _handleMessage(srcAddress, srcChainId, message, executor);
    }

    /// @dev Handle the verified message.
    function _handleMessage(
        bytes32 srcAddress,
        uint256 srcChainId,
        bytes calldata message,
        address executor
    )
        internal
        virtual;

    /// @dev Sends a message to the trusted remote app.
    function _sendMessage(uint256 dstChainId, uint256 messageFee, uint256 gasLimit, bytes memory message) internal {
        bytes32 dstRemote = trustedRemotes[dstChainId];
        if (dstRemote == 0) {
            revert LegacyReceiver__TrustedRemoteZeroAddress(dstChainId);
        }
        if (address(this).balance < messageFee) {
            revert LegacyReceiver__BalanceBelowMin(address(this).balance, messageFee);
        }
        bytes memory options = LegacyOptionsLib.encodeLegacyOptions(gasLimit);
        IMessageBus(messageBus).sendMessage{value: messageFee}({
            receiver: dstRemote,
            dstChainId: dstChainId,
            message: message,
            options: options
        });
    }

    /// @notice Calculates the fee to send a message to the remote app.
    function _getMessageFee(
        uint256 dstChainId,
        uint256 gasLimit,
        uint256 messageLen
    )
        internal
        view
        returns (uint256 fee)
    {
        bytes memory options = LegacyOptionsLib.encodeLegacyOptions(gasLimit);
        fee = IMessageBus(messageBus).estimateFeeExact(dstChainId, options, messageLen);
    }
}

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

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @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://consensys.net/diligence/blog/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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @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 or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * 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.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @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`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) private pure {
        // 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 FailedInnerCall();
        }
    }
}

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

abstract contract LegacyReceiverEvents {
    event MessageBusSet(address messageBus);
    event TrustedRemoteSet(uint256 chainId, bytes32 trustedRemote);
}

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

interface ILegacyReceiver {
    function executeMessage(bytes32 srcAddress, uint256 srcChainId, bytes memory message, address executor) external;
}

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

interface IMessageBus {
    error MessageBus__ReceiverNotEVM(bytes32 receiver);

    /// @notice Sends a message to a receiving contract address on another chain.
    /// Sender must make sure that the message is unique and not a duplicate message.
    /// @dev Legacy MessageBus only supports V1 of the options format, which specifies only the gas limit.
    /// @param receiver     The bytes32 address of the destination contract to be called
    /// @param dstChainId   The destination chain ID - typically, standard EVM chain ID, but differs on nonEVM chains
    /// @param message      The arbitrary payload to pass to the destination chain receiver
    /// @param options      Versioned struct used to instruct relayer on how to proceed with gas limits
    function sendMessage(
        bytes32 receiver,
        uint256 dstChainId,
        bytes memory message,
        bytes memory options
    )
        external
        payable;

    /// @notice Allows the Interchain Governor to set the gas buffer for sending the interchain messages.
    /// Note: The gas buffer is added to the gas limit requested by the sending app to cover the gas usage
    /// of the MessageBus contract on the destination chain.
    function setGasBuffer(uint64 gasBuffer_) external;

    /// @notice Allows the Interchain Governor to set the message length in bytes to be used for fee estimation.
    /// This does not affect the sendMessage function, but only the fee estimation.
    function setMessageLengthEstimate(uint256 length) external;

    /// @notice Returns the preset message length in bytes used for fee estimation.
    function messageLengthEstimate() external view returns (uint256);

    /// @notice Returns srcGasToken fee to charge in wei for the cross-chain message based on the gas limit.
    /// @dev This function is using the preset message length to estimate the gas fee. This should cover most cases,
    /// if the message length is lower than the preset value. For more accurate fee estimation, use estimateFeeExact.
    /// @param dstChainId   The destination chain ID - typically, standard EVM chain ID, but differs on nonEVM chains
    /// @param options      Versioned struct used to instruct relayer on how to proceed with gas limits
    function estimateFee(uint256 dstChainId, bytes memory options) external view returns (uint256);

    /// @notice Returns srcGasToken fee to charge in wei for the cross-chain message based on the message length
    /// and the gas limit.
    /// @param dstChainId   The destination chain ID - typically, standard EVM chain ID, but differs on nonEVM chains
    /// @param options      Versioned struct used to instruct relayer on how to proceed with gas limits
    /// @param messageLen   The length of the message to be sent in bytes
    function estimateFeeExact(
        uint256 dstChainId,
        bytes memory options,
        uint256 messageLen
    )
        external
        view
        returns (uint256);

    /// @notice Returns the nonce of MessageBus: the amount of sent messages so far.
    function nonce() external view returns (uint64);
}

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

library LegacyOptionsLib {
    /// @notice Supported version of the legacy options format.
    uint16 internal constant LEGACY_OPTIONS_VERSION = 1;
    /// @dev The length of the legacy options format: 2 bytes for the version and 32 bytes for the gas limit.
    uint256 private constant LEGACY_OPTIONS_LENGTH = 34;
    /// @dev The offset of the gas limit in the legacy options format.
    uint256 private constant GAS_LIMIT_OFFSET = 2;

    error LegacyOptionsLib__PayloadInvalid(bytes legacyOpts);

    /// @notice Encodes the gas limit into a legacy options format.
    /// @param gasLimit     The gas limit to encode.
    /// @return legacyOpts  The encoded legacy options
    function encodeLegacyOptions(uint256 gasLimit) internal pure returns (bytes memory legacyOpts) {
        return abi.encodePacked(LEGACY_OPTIONS_VERSION, gasLimit);
    }

    /// @notice Decodes the gas limit from a legacy options format.
    /// @param legacyOpts   The encoded legacy options
    /// @return gasLimit    The gas limit
    function decodeLegacyOptions(bytes calldata legacyOpts) internal pure returns (uint256 gasLimit) {
        if (legacyOpts.length != LEGACY_OPTIONS_LENGTH) {
            revert LegacyOptionsLib__PayloadInvalid(legacyOpts);
        }
        uint16 version = uint16(bytes2(legacyOpts[:GAS_LIMIT_OFFSET]));
        if (version != LEGACY_OPTIONS_VERSION) {
            revert LegacyOptionsLib__PayloadInvalid(legacyOpts);
        }
        gasLimit = uint256(bytes32(legacyOpts[GAS_LIMIT_OFFSET:]));
    }
}

// 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/=node_modules/@openzeppelin/",
    "@synapsecns/=node_modules/@synapsecns/",
    "ds-test/=node_modules/ds-test/src/",
    "forge-std/=node_modules/forge-std/src/"
  ],
  "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": {}
}

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