package com.zeodao.reminder.scheduler;

import com.zeodao.reminder.config.TaskReminderConfig;
import com.zeodao.reminder.service.EnabledCheckService;
import com.zeodao.reminder.service.TaskReminderService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ScheduledFuture;

/**
 * 动态任务调度器
 * 根据配置文件动态创建定时任务
 *
 * @author Zeodao
 * @version 2.0.0
 */
@Component
public class DynamicTaskScheduler {

    private static final Logger logger = LoggerFactory.getLogger(DynamicTaskScheduler.class);

    @Autowired
    private TaskReminderConfig taskReminderConfig;

    @Autowired
    private TaskReminderService taskReminderService;

    @Autowired
    private EnabledCheckService enabledCheckService;

    @Autowired
    private TaskScheduler taskScheduler;

    private final Map<String, ScheduledFuture<?>> scheduledTasks = new HashMap<>();

    @PostConstruct
    public void initScheduledTasks() {
        logger.info("=== 初始化动态定时任务 ===");

        for (TaskReminderConfig.Group group : taskReminderConfig.getGroups()) {
            createSchedulesForGroup(group);
        }

        logger.info("=== 动态定时任务初始化完成，共创建 {} 个任务 ===", scheduledTasks.size());
    }

    /**
     * 为指定群组创建定时任务
     */
    private void createSchedulesForGroup(TaskReminderConfig.Group group) {
        logger.info("为群组 {} 创建定时任务", group.getName());

        for (Map.Entry<String, TaskReminderConfig.Schedule> entry : group.getSchedules().entrySet()) {
            String scheduleType = entry.getKey();
            TaskReminderConfig.Schedule schedule = entry.getValue();

            // 检查该提醒类型是否启用
            if (!enabledCheckService.isReminderEnabled(group, scheduleType)) {
                logger.debug("跳过禁用的提醒类型: {} - {}", group.getName(), scheduleType);
                continue;
            }

            String taskKey = group.getId() + "-" + scheduleType;

            try {
                CronTrigger cronTrigger = new CronTrigger(schedule.getTime());

                Runnable task = () -> {
                    try {
                        logger.info("=== 执行定时任务: {} - {} ===", group.getName(), scheduleType);
                        taskReminderService.sendReminder(group.getId(), scheduleType);
                    } catch (Exception e) {
                        logger.error("定时任务执行失败: {} - {}", group.getName(), scheduleType, e);
                    }
                };

                ScheduledFuture<?> scheduledFuture = taskScheduler.schedule(task, cronTrigger);
                scheduledTasks.put(taskKey, scheduledFuture);

                logger.info("创建定时任务成功: {} - {} ({})", group.getName(), scheduleType, schedule.getTime());

            } catch (Exception e) {
                logger.error("创建定时任务失败: {} - {} ({})", group.getName(), scheduleType, schedule.getTime(), e);
            }
        }
    }

    /**
     * 重新加载所有定时任务
     */
    public void reloadScheduledTasks() {
        logger.info("=== 重新加载定时任务 ===");

        // 取消所有现有任务
        cancelAllTasks();

        // 重新创建任务
        initScheduledTasks();
    }

    /**
     * 取消所有定时任务
     */
    private void cancelAllTasks() {
        logger.info("取消所有现有定时任务");

        for (Map.Entry<String, ScheduledFuture<?>> entry : scheduledTasks.entrySet()) {
            String taskKey = entry.getKey();
            ScheduledFuture<?> future = entry.getValue();

            if (future != null && !future.isCancelled()) {
                future.cancel(false);
                logger.debug("取消定时任务: {}", taskKey);
            }
        }

        scheduledTasks.clear();
    }

    /**
     * 获取当前活跃的任务数量
     */
    public int getActiveTaskCount() {
        return (int) scheduledTasks.values().stream()
            .filter(future -> future != null && !future.isCancelled())
            .count();
    }

    /**
     * 获取任务状态信息
     */
    public String getTaskStatusInfo() {
        StringBuilder info = new StringBuilder();
        info.append("=== 定时任务状态 ===\n");
        info.append("总任务数: ").append(scheduledTasks.size()).append("\n");
        info.append("活跃任务数: ").append(getActiveTaskCount()).append("\n");
        info.append("配置群组数: ").append(taskReminderConfig.getGroups().size()).append("\n\n");

        info.append("=== 群组配置详情 ===\n");
        for (TaskReminderConfig.Group group : taskReminderConfig.getGroups()) {
            info.append("群组: ").append(group.getName()).append(" (").append(group.getId()).append(")\n");
            info.append("任务系统: ").append(group.getTaskSystem()).append("\n");
            info.append("定时任务:\n");

            for (Map.Entry<String, TaskReminderConfig.Schedule> entry : group.getSchedules().entrySet()) {
                String scheduleType = entry.getKey();
                TaskReminderConfig.Schedule schedule = entry.getValue();
                String taskKey = group.getId() + "-" + scheduleType;

                ScheduledFuture<?> future = scheduledTasks.get(taskKey);
                boolean isEnabled = enabledCheckService.isReminderEnabled(group, scheduleType);
                String status;

                if (!isEnabled) {
                    status = "已禁用";
                } else if (future != null && !future.isCancelled()) {
                    status = "运行中";
                } else {
                    status = "已停止";
                }

                info.append("  - ").append(scheduleType).append(": ").append(schedule.getTime())
                    .append(" (").append(status).append(")\n");
            }
            info.append("\n");
        }

        return info.toString();
    }

    @PreDestroy
    public void destroy() {
        logger.info("=== 销毁动态定时任务调度器 ===");
        cancelAllTasks();
    }
}