package com.ruoyi.alarm.globalAlarm.service.impl;

import com.ruoyi.alarm.globalAlarm.domain.GuidePriorityQueue;
import com.ruoyi.alarm.globalAlarm.domain.GuideTask;
import org.apache.tomcat.util.threads.TaskThread;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.PriorityBlockingQueue;

/**
 * @ClassName QueueManager
 * @Description: 队列管理
 * @Author 刘苏义
 * @Date 2023/6/29 21:09
 * @Version 1.0
 */

@Component
public class QueueManager {

    @Autowired
    private QueueTaskExecutor taskExecutor;
    private Map<String, TaskThread> threadMap = new ConcurrentHashMap<>();

    /*内部静态类*/
    private static class TaskThread {
        private Thread thread;
        private GuideTask currentTask;

        public TaskThread(Thread thread, GuideTask currentTask) {
            this.thread = thread;
            this.currentTask = currentTask;
        }

        public Thread getThread() {
            return thread;
        }

        public GuideTask getCurrentTask() {
            return currentTask;
        }

        public void setCurrentTask(GuideTask task) {
            this.currentTask = task;
        }
    }

    /**
     * 引导任务入队
     * 刘苏义
     * 2023/6/30 8:57
     */
    public void addTaskToQueue(String cameraId, GuideTask task) {
        /*通过相机ID获取引导队列，并将引导任务加入队列*/
        PriorityBlockingQueue<GuideTask> guideTaskQueue = GuidePriorityQueue.cameraQueueMap.get(cameraId);
        guideTaskQueue.add(task);
        /*获取该相机的当前执行线程*/
        TaskThread currentTaskThread = threadMap.get(cameraId);
        //如果队列当前线程正在运行，若入队任务优先级大于当前任务优先级，则终止当前线程
        if (currentTaskThread != null && task.getPriority() > currentTaskThread.getCurrentTask().getPriority()) {
            currentTaskThread.getThread().interrupt();
        }
        //如果队列当前没有线程正在运行，则启动新线程
        if (currentTaskThread == null || !currentTaskThread.getThread().isAlive()) {
            Thread newThread = createThread(cameraId, guideTaskQueue);
            threadMap.put(cameraId, new TaskThread(newThread, task));
            newThread.start();
        }
    }

    /**
     * 创建线程
     * 刘苏义
     * 2023/6/30 9:04
     */
    private Thread createThread(String queueName, PriorityBlockingQueue<GuideTask> queue) {

        return new Thread(() -> {
            while (!Thread.currentThread().isInterrupted()) {
                try {
                    GuideTask task = queue.take();
                    taskExecutor.processTask(task);
                    GuidePriorityQueue.printPriorityQueue();
                    // 更新线程的当前任务
                    TaskThread currentTaskThread = threadMap.get(queueName);
                    if (currentTaskThread != null) {
                        currentTaskThread.setCurrentTask(task);
                    }
                } catch (InterruptedException e) {
                    //线程中断，退出循环
                    Thread.currentThread().interrupt();
                }
            }
        }, queueName);
    }
}