package com.mzl.flower.schedule;

import com.mzl.flower.entity.film.AiContentTaskConfig;
import com.mzl.flower.mapper.film.AiContentTaskConfigMapper;
import com.mzl.flower.service.film.AiContentTaskConfigService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledFuture;
import java.util.stream.Collectors;

@Component
public class DynamicTaskManager {
    private final Map<Long, ScheduledFuture<?>> scheduledTasks = new ConcurrentHashMap<>();

    @Autowired
    private ThreadPoolTaskScheduler taskScheduler;
    @Resource
    private AiContentTaskConfigMapper aiContentTaskConfigMapper;
    @Autowired
    private TaskExecutor taskExecutor;

    @PostConstruct
    public void init() {
        refreshTasks();
    }

    public synchronized void refreshTasks() {
        List<AiContentTaskConfig> latestConfigs = aiContentTaskConfigMapper.getAiContentTaskConfigAll();
        Set<Long> latestIds = latestConfigs.stream()
                .map(AiContentTaskConfig::getId)
                .collect(Collectors.toSet());

        // 移除无效任务
        new HashSet<>(scheduledTasks.keySet()).forEach(id -> {
            if (!latestIds.contains(id)) {
                cancelAndRemoveTask(id);
            }
        });

        // 更新/新增任务
        latestConfigs.forEach(config -> {
            ScheduledFuture<?> existingTask = scheduledTasks.get(config.getId());

            if (existingTask == null) {
                registerNewTask(config);
            } else if (isConfigModified(config)) {
                cancelAndRemoveTask(config.getId());
                registerNewTask(config);
            }
        });
    }

    private void registerNewTask(AiContentTaskConfig config) {
        ScheduledFuture<?> future = taskScheduler.schedule(
                () -> taskExecutor.executeTask(config),
                new CronTrigger(config.getCron())
        );
        scheduledTasks.put(config.getId(), future);
    }

    private void cancelAndRemoveTask(Long taskId) {
        ScheduledFuture<?> task = scheduledTasks.get(taskId);
        if (task != null) {
            task.cancel(false); // 不中断正在执行的任务
            scheduledTasks.remove(taskId);
        }
    }

    private boolean isConfigModified(AiContentTaskConfig newConfig) {
        // 实现配置变更检查逻辑（比较字段或版本号）
        return true; // 简化示例
    }
}