package com.ard.tianyu.netty.handler;// MessageProtocolDecoder.java

import com.ard.tianyu.netty.command.*;
import com.ard.tianyu.netty.protobuf.TelemetryDataPB;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import lombok.extern.slf4j.Slf4j;

import java.util.List;

@Slf4j
public class MessageProtocolDecoder extends ByteToMessageDecoder {
    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
        // 检查可读字节数是否足够
        if (in.readableBytes() < 4) {
            return; // 不足以读取头部
        }

        in.markReaderIndex(); // 标记当前读取位置
        short dataHead = in.readShort();
        if (dataHead != 0x6A77) {
            return;
        }
        short dataLength = in.readShort();

        if (in.readableBytes() < dataLength) {
            in.resetReaderIndex(); // 如果不足，重置读取位置
            return;
        }
        byte cmdCode = in.readByte();
        BaseCommand baseCommand = null;
        switch (cmdCode) {
            case 0x01:
                byte success = in.readByte(); // 读取是否成功
                log.warn("注册回复: {}", success == 0x01 ? "成功" : "失败");
                baseCommand = new RegisterReplyCommand(success);
                break;
            case 0x02:
                long timestamp = in.readLong(); // 读取时间戳
                baseCommand = new HeartbeatReplyCommand(timestamp);
                log.debug("心跳回复: 时间戳 {}", timestamp);
                break;
            case 0x03:
            case 0x04:
                byte[] boxSn = new byte[dataLength - 1];
                in.readBytes(boxSn);
                SubscribeReplyCommand subscribeReply = new SubscribeReplyCommand(new String(boxSn));
                log.debug("订阅回复: {}", subscribeReply.getBoxSn());
                break;
            case (byte) 0xA8:
                byte[] uavStatus = new byte[dataLength - 1];
                in.readBytes(uavStatus);  // 读取 ProtoBuf 数据
                TelemetryDataPB.UavState uavState = TelemetryDataPB.UavState.parseFrom(uavStatus);
                baseCommand = new UavStateCommand(uavState);
                log.warn("无人机状态数据： {}", uavState.getBoxSn());
                break;
            case (byte) 0xA9:
                byte[] uavData = new byte[dataLength - 1];
                in.readBytes(uavData);
                TelemetryDataPB.TelemetryData telemetryData = TelemetryDataPB.TelemetryData.parseFrom(uavData);
                baseCommand = new UavDataCommand(telemetryData);
                log.warn("无人机遥测数据： {}", telemetryData.getBoxSn());
                break;
            default:
                log.warn("无法识别的命令码: {}", String.format("0x%02X", cmdCode & 0xFF));//String.format("0x%02X", cmdCode & 0xFF)
        }
        if (baseCommand != null) {
            out.add(baseCommand);
        }
    }
}