package com.ard.tianyu.websocket.handler;

import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.TypeReference;
import com.ard.tianyu.service.control.UavControlService;
import com.ard.tianyu.websocket.domain.BaseMessage;
import com.ard.tianyu.websocket.domain.UavStreamMessage;
import com.ard.tianyu.websocket.domain.UavStateMessage;
import com.ard.tianyu.websocket.utils.WebSocketUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;
import javax.annotation.Resource;


@Component
@Slf4j
public class TyMessageHandler extends TextWebSocketHandler {

    @Resource
    private UavStreamManager uavStreamManager;
    @Resource
    private UavControlService uavControlService;
    @Resource
    private UavStateManager uavStateManager;


    @Override
    public void handleTextMessage(WebSocketSession session, TextMessage message) {
        String userIdStr = (String) session.getAttributes().get("userId");
        Long userId = Long.parseLong(userIdStr);
        String payload = message.getPayload();
        log.info("【cmd】Received message: {}", payload);
        log.info("【cmd】size: {}", WebSocketUtil.ONLINE_USER_SESSIONS.size());

        BaseMessage<?> baseMessage = JSON.parseObject(payload, BaseMessage.class);
        switch (baseMessage.getType()) {
            case "stream":
                handleStreamMessage(payload, userId);
                break;
            case "state":
                handleStateMessage(payload, userId);
                break;
        }
    }

    /**
     * 处理流消息
     * <p>
     * 该方法解析给定的负载数据，以获取无人机流消息，并根据消息类型决定是否开始或停止流
     *
     * @param payload 消息的负载数据，通常为JSON字符串
     * @param userId  接收消息的用户ID
     */
    private void handleStreamMessage(String payload, Long userId) {
        // 解析JSON负载数据为BaseMessage对象，包含UavStreamMessage类型的有效载荷
        BaseMessage<UavStreamMessage> streamMessage = JSON.parseObject(payload,
                new TypeReference<BaseMessage<UavStreamMessage>>() {
                });
        UavStreamMessage uavStreamMessage = streamMessage.getPayload();

        // 检查解析后的UavStreamMessage对象是否非空
        if (uavStreamMessage != null) {
            String boxSn = uavStreamMessage.getBoxSn();

            // 根据Subscribe决定操作类型：true表示开始拉流，false表示停止拉流
            if (uavStreamMessage.getSubscribe()) {
                uavStreamManager.startPullStream(boxSn, userId);
            } else {
                uavStreamManager.stopPullStream(boxSn, userId);
            }
        }
    }

    /**
     * 处理状态消息
     * 根据接收到的消息内容，决定无人机状态信息的订阅或退订
     *
     * @param payload 消息负载，包含订阅信息
     * @param userId  用户ID，用于标识用户
     */
    private void handleStateMessage(String payload, Long userId) {
        // 解析接收到的JSON消息，将其转换为BaseMessage对象
        BaseMessage<UavStateMessage> stateMessage = JSON.parseObject(payload,
                new TypeReference<BaseMessage<UavStateMessage>>() {
                });
        // 获取消息的有效载荷部分
        UavStateMessage uavStateMessage = stateMessage.getPayload();

        // 检查有效载荷是否存在
        if (uavStateMessage != null) {
            // 获取无人机盒子的序列号
            String boxSn = uavStateMessage.getBoxSn();
            // 根据消息中的订阅标志，决定是订阅还是退订无人机状态
            Boolean subscribe = uavStateMessage.getSubscribe();
            if (subscribe) {
                // 执行订阅操作
                uavStateManager.subscribeState(boxSn, userId);
            } else {
                // 执行退订操作
                uavStateManager.unsubscribeState(boxSn, userId);
            }
        }
    }


    @Override
    public void afterConnectionEstablished(WebSocketSession session) {
        log.info("【cmd】Connected: {}", session.getId());
        String userIdStr = (String) session.getAttributes().get("userId");
        Long userId = Long.parseLong(userIdStr);
        WebSocketUtil.ONLINE_USER_SESSIONS.put(userId, session);
        log.info("【cmd】size: {}", WebSocketUtil.ONLINE_USER_SESSIONS.size());
    }

    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) {
        log.info("【cmd】Disconnected: {}", session.getId());
        String userIdStr = (String) session.getAttributes().get("userId");
        Long userId = Long.parseLong(userIdStr);
        WebSocketUtil.ONLINE_USER_SESSIONS.remove(userId);
        log.info("【cmd】size: {}", WebSocketUtil.ONLINE_USER_SESSIONS.size());
        // 停止用户的所有流
        uavStreamManager.stopAllPullStreamByUser(userId);
        if (userId != null) {
            // 释放该用户所有 UAV 控制权
            uavControlService.releaseAllControls(userId);
        }

        uavStateManager.removeSubscribeState(userId);
    }
}