import cron from 'node-cron';
import { scheduleService, PresetActionPayload } from './scheduleService';
import { groupService } from './groupService';
import { WledPlaylist } from '../wled/types';

interface ScheduledTask {
  startTask: cron.ScheduledTask;
  endTask?: cron.ScheduledTask;
  scheduleId: string;
}

export class SchedulerService {
  private tasks: Map<string, ScheduledTask> = new Map();

  async initialize(): Promise<void> {
    console.log('Initializing scheduler...');
    const schedules = await scheduleService.getAllSchedules();
    const enabledSchedules = schedules.filter((s) => s.enabled);

    console.log(`Found ${enabledSchedules.length} enabled schedules`);

    for (const schedule of enabledSchedules) {
      this.registerSchedule(schedule.id);
    }
  }

  async registerSchedule(scheduleId: string): Promise<void> {
    // Remove existing task if any
    this.unregisterSchedule(scheduleId);

    const schedule = await scheduleService.getScheduleById(scheduleId);
    if (!schedule || !schedule.enabled) {
      return;
    }

    try {
      // Register start task
      const startTask = cron.schedule(
        schedule.cronExpression,
        async () => {
          console.log(`Executing schedule: ${schedule.name} (${schedule.id})`);
          await this.executeSchedule(scheduleId);
        },
        {
          timezone: schedule.timezone,
          scheduled: true,
        }
      );

      const scheduledTask: ScheduledTask = { 
        startTask, 
        scheduleId 
      };

      // Register end task if endCronExpression exists
      if (schedule.endCronExpression) {
        const endTask = cron.schedule(
          schedule.endCronExpression,
          async () => {
            console.log(`Executing end schedule (turning off): ${schedule.name} (${schedule.id})`);
            await this.turnOffGroup(schedule.groupId);
          },
          {
            timezone: schedule.timezone,
            scheduled: true,
          }
        );
        scheduledTask.endTask = endTask;
        console.log(
          `Registered schedule: ${schedule.name} with start: ${schedule.cronExpression}, end: ${schedule.endCronExpression} (${schedule.timezone})`
        );
      } else {
        console.log(
          `Registered schedule: ${schedule.name} with cron: ${schedule.cronExpression} (${schedule.timezone})`
        );
      }

      this.tasks.set(scheduleId, scheduledTask);
    } catch (error) {
      console.error(`Failed to register schedule ${scheduleId}:`, error);
    }
  }

  unregisterSchedule(scheduleId: string): void {
    const existing = this.tasks.get(scheduleId);
    if (existing) {
      existing.startTask.stop();
      if (existing.endTask) {
        existing.endTask.stop();
      }
      this.tasks.delete(scheduleId);
      console.log(`Unregistered schedule: ${scheduleId}`);
    }
  }

  private async executeSchedule(scheduleId: string): Promise<void> {
    try {
      const schedule = await scheduleService.getScheduleById(scheduleId);
      if (!schedule) {
        console.error(`Schedule ${scheduleId} not found`);
        return;
      }

      const actionPayload = scheduleService.parseActionPayload(schedule);

      if (schedule.type === 'PRESET') {
        const payload = actionPayload as PresetActionPayload;
        console.log(`Applying preset ${payload.presetId} to group ${schedule.groupId}`);
        const result = await groupService.applyPresetToGroup(schedule.groupId, payload.presetId);
        console.log(`Preset applied. Success: ${result.results.success.length}, Failed: ${result.results.failed.length}`);
      } else if (schedule.type === 'PLAYLIST') {
        const payload = actionPayload as WledPlaylist;
        console.log(`Applying playlist to group ${schedule.groupId}`);
        const result = await groupService.applyPlaylistToGroup(schedule.groupId, payload);
        console.log(`Playlist applied. Success: ${result.results.success.length}, Failed: ${result.results.failed.length}`);
      }
    } catch (error) {
      console.error(`Error executing schedule ${scheduleId}:`, error);
    }
  }

  private async turnOffGroup(groupId: string): Promise<void> {
    try {
      console.log(`Turning off group ${groupId}`);
      const result = await groupService.turnOffGroup(groupId);
      console.log(`Group turned off. Success: ${result.results.success.length}, Failed: ${result.results.failed.length}`);
    } catch (error) {
      console.error(`Error turning off group ${groupId}:`, error);
    }
  }

  async shutdown(): Promise<void> {
    console.log('Shutting down scheduler...');
    for (const [scheduleId] of this.tasks) {
      this.unregisterSchedule(scheduleId);
    }
  }
}

export const schedulerService = new SchedulerService();