// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import {UpgradeableNonblockingLzApp, ExcessivelySafeCall, BytesLib} from "src/OFTV2/UpgradeableNonblockingLzApp.sol";
import {ICommonOFT} from "src/OFTV2/ICommonOFT.sol";
import {IOFTReceiverV2} from "src/OFTV2/IOFTReceiverV2.sol";

abstract contract UpgradeableOFTCoreV2 is UpgradeableNonblockingLzApp {
    using BytesLib for bytes;
    using ExcessivelySafeCall for address;

    uint256 public constant NO_EXTRA_GAS = 0;

    // packet type
    uint8 public constant PT_SEND = 0;
    uint8 public constant PT_SEND_AND_CALL = 1;

    uint8 public sharedDecimals;

    mapping(uint16 => mapping(bytes => mapping(uint64 => bool))) public creditedPackets;

    /**
     * @dev Emitted when `_amount` tokens are moved from the `_sender` to (`_dstChainId`, `_toAddress`)
     * `_nonce` is the outbound nonce
     */
    event SendToChain(uint16 indexed _dstChainId, address indexed _from, bytes32 indexed _toAddress, uint256 _amount);

    /**
     * @dev Emitted when `_amount` tokens are received from `_srcChainId` into the `_toAddress` on the local chain.
     * `_nonce` is the inbound nonce.
     */
    event ReceiveFromChain(uint16 indexed _srcChainId, address indexed _to, uint256 _amount);

    event CallOFTReceivedSuccess(uint16 indexed _srcChainId, bytes _srcAddress, uint64 _nonce, bytes32 _hash);

    event NonContractAddress(address _address);

    // _sharedDecimals should be the minimum decimals on all chains
    function __initOFTCoreV2(uint8 _sharedDecimals, address _lzEndpoint) internal {
        __initNonBlockingLzApp(_lzEndpoint);

        sharedDecimals = _sharedDecimals;
    }

    /**
     *
     * public functions
     *
     */
    function callOnOFTReceived(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint64 _nonce,
        bytes32 _from,
        address _to,
        uint256 _amount,
        bytes calldata _payload,
        uint256 _gasForCall
    ) public virtual {
        require(_msgSender() == address(this), "OFTCore: caller must be OFTCore");

        // send
        _amount = _transferFrom(address(this), _to, _amount);
        emit ReceiveFromChain(_srcChainId, _to, _amount);

        // call
        IOFTReceiverV2(_to).onOFTReceived{gas: _gasForCall}(_srcChainId, _srcAddress, _nonce, _from, _amount, _payload);
    }

    /**
     *
     * internal functions
     *
     */
    function _estimateSendFee(
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint256 _amount,
        bool _useZro,
        bytes memory _adapterParams
    ) internal view virtual returns (uint256 nativeFee, uint256 zroFee) {
        // mock the payload for sendFrom()
        bytes memory payload = _encodeSendPayload(_toAddress, _ld2sd(_amount));
        return lzEndpoint.estimateFees(_dstChainId, address(this), payload, _useZro, _adapterParams);
    }

    function _estimateSendAndCallFee(
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint256 _amount,
        bytes memory _payload,
        uint64 _dstGasForCall,
        bool _useZro,
        bytes memory _adapterParams
    ) internal view virtual returns (uint256 nativeFee, uint256 zroFee) {
        // mock the payload for sendAndCall()
        bytes memory payload =
            _encodeSendAndCallPayload(msg.sender, _toAddress, _ld2sd(_amount), _payload, _dstGasForCall);
        return lzEndpoint.estimateFees(_dstChainId, address(this), payload, _useZro, _adapterParams);
    }

    function _nonblockingLzReceive(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload)
        internal
        virtual
        override
    {
        uint8 packetType = _payload.toUint8(0);

        if (packetType == PT_SEND) {
            _sendAck(_srcChainId, _srcAddress, _nonce, _payload);
        } else if (packetType == PT_SEND_AND_CALL) {
            _sendAndCallAck(_srcChainId, _srcAddress, _nonce, _payload);
        } else {
            revert("OFTCore: unknown packet type");
        }
    }

    function _send(
        address _from,
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint256 _amount,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes memory _adapterParams
    ) internal virtual returns (uint256 amount) {
        _checkGasLimit(_dstChainId, PT_SEND, _adapterParams, NO_EXTRA_GAS);

        (amount,) = _removeDust(_amount);
        amount = _debitFrom(_from, _dstChainId, _toAddress, amount); // amount returned should not have dust
        require(amount > 0, "OFTCore: amount too small");

        bytes memory lzPayload = _encodeSendPayload(_toAddress, _ld2sd(amount));
        _lzSend(_dstChainId, lzPayload, _refundAddress, _zroPaymentAddress, _adapterParams, msg.value);

        emit SendToChain(_dstChainId, _from, _toAddress, amount);
    }

    function _sendAck(uint16 _srcChainId, bytes memory, uint64, bytes memory _payload) internal virtual {
        (address to, uint64 amountSD) = _decodeSendPayload(_payload);
        if (to == address(0)) {
            to = address(0xdead);
        }

        uint256 amount = _sd2ld(amountSD);
        amount = _creditTo(_srcChainId, to, amount);

        emit ReceiveFromChain(_srcChainId, to, amount);
    }

    function _sendAndCall(
        address _from,
        uint16 _dstChainId,
        bytes32 _toAddress,
        uint256 _amount,
        bytes memory _payload,
        uint64 _dstGasForCall,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes memory _adapterParams
    ) internal virtual returns (uint256 amount) {
        _checkGasLimit(_dstChainId, PT_SEND_AND_CALL, _adapterParams, _dstGasForCall);

        (amount,) = _removeDust(_amount);
        amount = _debitFrom(_from, _dstChainId, _toAddress, amount);
        require(amount > 0, "OFTCore: amount too small");

        // encode the msg.sender into the payload instead of _from
        bytes memory lzPayload =
            _encodeSendAndCallPayload(msg.sender, _toAddress, _ld2sd(amount), _payload, _dstGasForCall);
        _lzSend(_dstChainId, lzPayload, _refundAddress, _zroPaymentAddress, _adapterParams, msg.value);

        emit SendToChain(_dstChainId, _from, _toAddress, amount);
    }

    function _sendAndCallAck(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload)
        internal
        virtual
    {
        (bytes32 from, address to, uint64 amountSD, bytes memory payloadForCall, uint64 gasForCall) =
            _decodeSendAndCallPayload(_payload);

        bool credited = creditedPackets[_srcChainId][_srcAddress][_nonce];
        uint256 amount = _sd2ld(amountSD);

        // credit to this contract first, and then transfer to receiver only if callOnOFTReceived() succeeds
        if (!credited) {
            amount = _creditTo(_srcChainId, address(this), amount);
            creditedPackets[_srcChainId][_srcAddress][_nonce] = true;
        }

        if (!_isContract(to)) {
            emit NonContractAddress(to);
            return;
        }

        // workaround for stack too deep
        uint16 srcChainId = _srcChainId;
        bytes memory srcAddress = _srcAddress;
        uint64 nonce = _nonce;
        bytes memory payload = _payload;
        bytes32 from_ = from;
        address to_ = to;
        uint256 amount_ = amount;
        bytes memory payloadForCall_ = payloadForCall;

        // no gas limit for the call if retry
        uint256 gas = credited ? gasleft() : gasForCall;
        (bool success, bytes memory reason) = address(this).excessivelySafeCall(
            gasleft(),
            150,
            abi.encodeWithSelector(
                this.callOnOFTReceived.selector,
                srcChainId,
                srcAddress,
                nonce,
                from_,
                to_,
                amount_,
                payloadForCall_,
                gas
            )
        );

        if (success) {
            bytes32 hash = keccak256(payload);
            emit CallOFTReceivedSuccess(srcChainId, srcAddress, nonce, hash);
        } else {
            // store the failed message into the nonblockingLzApp
            _storeFailedMessage(srcChainId, srcAddress, nonce, payload, reason);
        }
    }

    function _isContract(address _account) internal view returns (bool) {
        return _account.code.length > 0;
    }

    function _ld2sd(uint256 _amount) internal view virtual returns (uint64) {
        uint256 amountSD = _amount / _ld2sdRate();
        require(amountSD <= type(uint64).max, "OFTCore: amountSD overflow");
        return uint64(amountSD);
    }

    function _sd2ld(uint64 _amountSD) internal view virtual returns (uint256) {
        return _amountSD * _ld2sdRate();
    }

    function _removeDust(uint256 _amount) internal view virtual returns (uint256 amountAfter, uint256 dust) {
        dust = _amount % _ld2sdRate();
        amountAfter = _amount - dust;
    }

    function _encodeSendPayload(bytes32 _toAddress, uint64 _amountSD) internal view virtual returns (bytes memory) {
        return abi.encodePacked(PT_SEND, _toAddress, _amountSD);
    }

    function _decodeSendPayload(bytes memory _payload) internal view virtual returns (address to, uint64 amountSD) {
        require(_payload.toUint8(0) == PT_SEND && _payload.length == 41, "OFTCore: invalid payload");

        to = _payload.toAddress(13); // drop the first 12 bytes of bytes32
        amountSD = _payload.toUint64(33);
    }

    function _encodeSendAndCallPayload(
        address _from,
        bytes32 _toAddress,
        uint64 _amountSD,
        bytes memory _payload,
        uint64 _dstGasForCall
    ) internal view virtual returns (bytes memory) {
        return abi.encodePacked(
            PT_SEND_AND_CALL, _toAddress, _amountSD, _addressToBytes32(_from), _dstGasForCall, _payload
        );
    }

    function _decodeSendAndCallPayload(bytes memory _payload)
        internal
        view
        virtual
        returns (bytes32 from, address to, uint64 amountSD, bytes memory payload, uint64 dstGasForCall)
    {
        require(_payload.toUint8(0) == PT_SEND_AND_CALL, "OFTCore: invalid payload");

        to = _payload.toAddress(13); // drop the first 12 bytes of bytes32
        amountSD = _payload.toUint64(33);
        from = _payload.toBytes32(41);
        dstGasForCall = _payload.toUint64(73);
        payload = _payload.slice(81, _payload.length - 81);
    }

    function _addressToBytes32(address _address) internal pure virtual returns (bytes32) {
        return bytes32(uint256(uint160(_address)));
    }

    function _debitFrom(address _from, uint16 _dstChainId, bytes32 _toAddress, uint256 _amount)
        internal
        virtual
        returns (uint256);

    function _creditTo(uint16 _srcChainId, address _toAddress, uint256 _amount) internal virtual returns (uint256);

    function _transferFrom(address _from, address _to, uint256 _amount) internal virtual returns (uint256);

    function _ld2sdRate() internal view virtual returns (uint256);
}
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