package com.ard.tianyu.websocket.handler;

import com.alibaba.fastjson2.JSON;
import com.ard.tianyu.model.receiver.BoxStreamUrlReceiver;
import com.ard.tianyu.service.ITyService;
import com.ard.tianyu.websocket.model.PullStreamDTO;
import com.ard.tianyu.websocket.utils.WebSocketUtil;
import com.ard.vtdu.domain.ArdVtdu;
import com.ard.vtdu.service.IMediaService;
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;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

@Component
@Slf4j
public class TyStreamHandler extends TextWebSocketHandler {

    @Resource
    private ITyService tyService;
    @Resource
    private IMediaService mediaService;

    //盒子拉流地址缓存
    private static final ConcurrentMap<String, String> BOX_STREAM_PULL_MAP = new ConcurrentHashMap<>();
    //盒子拉流用户集合缓存
    private static final ConcurrentMap<String, Set<String>> STREAM_USER_MAP = new ConcurrentHashMap<>();

    @Override
    public void handleTextMessage(WebSocketSession session, TextMessage message) {
        String userId = (String) session.getAttributes().get("userId");
        String payload = message.getPayload();
        PullStreamDTO pullStreamDTO = JSON.parseObject(payload, PullStreamDTO.class);

        if (pullStreamDTO != null) {
            String boxSn = pullStreamDTO.getBoxSn();
            if (pullStreamDTO.getPullType().equals(1)) {
                startPullStream(boxSn, userId);
            } else {
                stopPullStream(boxSn, userId);
            }
        }

        log.info("【stream】Received message: {}", payload);
        log.info("【stream】size: {}", WebSocketUtil.STREAM_ONLINE_USER_SESSIONS.size());
    }

    //开始拉流
    private void startPullStream(String boxSn, String userId) {
        STREAM_USER_MAP.computeIfAbsent(boxSn, k -> ConcurrentHashMap.newKeySet()).add(userId);
        String messageReply;
        if (BOX_STREAM_PULL_MAP.containsKey(boxSn)) {
            String webrtcUrl = BOX_STREAM_PULL_MAP.get(boxSn);
            messageReply = webrtcUrl;
            log.warn("【stream】Already pulled stream: {}", webrtcUrl);
        } else {
            BoxStreamUrlReceiver boxLiveUrl = tyService.getBoxLiveUrl(boxSn);
            if (boxLiveUrl != null) {
                ArdVtdu vtdu = ArdVtdu.builder().name(boxSn).mode(0).isCode(0).rtspSource(boxLiveUrl.getRtsp()).build();
                ArdVtdu ardVtdu = mediaService.addPath(vtdu);
                BOX_STREAM_PULL_MAP.put(boxSn, ardVtdu.getWebrtcUrl());
                messageReply = ardVtdu.getWebrtcUrl();
                log.warn("【stream】First pulled stream: {}", ardVtdu.getWebrtcUrl());
            } else {
                log.warn("【stream】Box stream not found: {}", boxSn);
                messageReply = "【stream】Box stream not found: " + boxSn;
            }
        }
        WebSocketUtil.sendMessage(WebSocketUtil.STREAM_ONLINE_USER_SESSIONS.get(userId), messageReply);
    }

    //停止拉流
    private void stopPullStream(String boxSn, String userId) {
        synchronized (this) {
            Set<String> users = STREAM_USER_MAP.get(boxSn);
            if (users != null) {
                users.remove(userId);
                int userCount = users.size();
                String messageReply;
                if (userCount == 0) {
                    closeStream(boxSn);
                    messageReply = "【stream】Stream closed due to no active users: " + boxSn;
                } else {
                    messageReply = "【stream】Stream is still in use, remaining users: " + users;
                }
                WebSocketUtil.sendMessage(WebSocketUtil.STREAM_ONLINE_USER_SESSIONS.get(userId), messageReply);
            }
        }
    }

    //关闭拉流
    private void closeStream(String boxSn) {
        mediaService.removePath(boxSn);
        BOX_STREAM_PULL_MAP.remove(boxSn);
        STREAM_USER_MAP.remove(boxSn);
        log.warn("【stream】Stream closed due to no active users: {}", boxSn);
    }

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

    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) {
        String userId = (String) session.getAttributes().get("userId");
        WebSocketUtil.STREAM_ONLINE_USER_SESSIONS.remove(userId);
        STREAM_USER_MAP.forEach((boxSn, users) -> stopPullStream(boxSn, userId));
        log.info("【stream】Disconnected: {}", session.getId());
        log.info("【stream】size: {}", WebSocketUtil.STREAM_ONLINE_USER_SESSIONS.size());
    }
}