package com.moral.webSocketServer;

import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.TimeoutException;

import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

import com.moral.service.MonitorPointService;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.QueueingConsumer;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

/**
 * @ServerEndpoint 注解是一个类层次的注解，它的功能主要是将目前的类定义成一个websocket服务器端,
 * 注解的值将被用于监听用户连接的终端访问URL地址,客户端可以通过这个URL来连接到WebSocket服务器端
 */
@Slf4j
@ServerEndpoint("/screen/webSocket/{param}")
@Component
public class WebSocketServer {

    public static MonitorPointService monitorPointService;

    // 与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;

    private String orgId;

    private String regionCode;

    private Connection connection;

    private Channel channel;

    // 存放session的集合，很重要！！
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();

    /**
     * 连接建立成功调用的方法
     *
     * @param session 可选的参数。session为与某个客户端的连接会话，需要通过它来给客户端发送数据
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("param") String param) {
        this.session = session;
        //这个一定要写，第一次很容易忽略！
        webSocketSet.add(this);
        int flag = param.indexOf("&");
        orgId = param.substring(0, flag);
        regionCode = param.substring(flag + 1);
        String QUEUE_NAME = "deviceInfo";
        try {
            //打开连接和创建频道，与发送端一样
            ConnectionFactory factory = new ConnectionFactory();
            //设置MabbitMQ所在主机ip或者主机名
            factory.setHost("47.96.15.25");
            factory.setPort(5672);
            factory.setUsername("guest");
            factory.setPassword("guest_pass");
            String routingKey = orgId+".*";
            connection = factory.newConnection();
            channel = connection.createChannel();
            //声明队列，主要为了防止消息接收者先运行此程序，队列还不存在时创建队列。
            channel.queueDeclare(QUEUE_NAME, false, false, true, null);
            channel.queueBind(QUEUE_NAME,"screens_data",routingKey);

            //创建队列消费者
            QueueingConsumer consumer = new QueueingConsumer(channel);
            //指定消费队列
            channel.basicConsume(QUEUE_NAME, true, consumer);

            while (true) {
                //nextDelivery是一个阻塞方法（内部实现其实是阻塞队列的take方法）
                QueueingConsumer.Delivery delivery = consumer.nextDelivery();
                String message = new String(delivery.getBody());
                sendMessage(message);
            }
        }catch (Exception e){
            log.error(e.getMessage());
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        /**从安全Set中 移除当前连接对象*/
        webSocketSet.remove(this);
        try {
            channel.close();
            connection.close();
        }catch (IOException | TimeoutException e){
            log.error(e.getMessage());
        }
    }

    @OnMessage
    public void onMessage(String message) {
        System.out.println(message);
        for (WebSocketServer webSocketServer : webSocketSet) {
            webSocketServer.sendMessage(message);
        }
    }

   /* @RabbitListener(bindings = @QueueBinding(
            value = @Queue(value = "deviceInfo", durable = "false", autoDelete = "true"),
            exchange = @Exchange(value = "screens_data", durable = "true", type = "topic"),
            key = "99.*"
    ))
    @RabbitHandler //注解意思:如果有消息过来 需要消费的时候才会调用该方法
    public void receiveMessage(@Payload String message, @Headers Map<String, Object> headers, Channel channel) throws IOException {
        //sendMessage(message.toString());
        onMessage(message);
       *//* Long deliveryTag = (Long) headers.get(AmqpHeaders.DELIVERY_TAG);
        //手动接受并告诉rabbitmq消息已经接受了  deliverTag记录接受消息 false不批量接受
        channel.basicAck(deliveryTag, true);*//*
    }*/

    /**
     * 服务器端推送消息
     */
    public void sendMessage(String message) {
        try {
            if (session.isOpen()) {
                this.session.getBasicRemote().sendText(message);
            }
        } catch (IOException e) {
            log.error(e.getMessage());
        }
    }

    /**
     * 发生错误时调用
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error(error.getMessage());
    }

}