/**
 * 后台任务管理模块 (Deno 版本)
 * 负责定期获取音乐状态和歌词更新
 */

import { ConnectionManager } from "./websocket_manager.ts";
import { getMusicStatus, MusicStatus } from "./apple_music.ts";
import { getLyricsData, LyricsData } from "./lyrics.ts";

let backgroundTaskId: number | null = null;

/**
 * 启动后台任务
 */
export function startBackgroundTask(manager: ConnectionManager): void {
  if (backgroundTaskId) {
    console.log("后台任务已在运行");
    return;
  }

  console.log("启动后台任务...");

  backgroundTaskId = setInterval(async () => {
    await updateMusicInfo(manager);
  }, 1000); // 每秒更新一次

  console.log("后台任务已启动");
}

/**
 * 停止后台任务
 */
export function stopBackgroundTask(): void {
  if (backgroundTaskId) {
    clearInterval(backgroundTaskId);
    backgroundTaskId = null;
    console.log("后台任务已停止");
  }
}

/**
 * 更新音乐信息并发送给客户端
 */
export async function updateMusicInfo(
  manager: ConnectionManager
): Promise<void> {
  try {
    // 获取音乐状态
    const musicStatus = await getMusicStatus();

    if (musicStatus.status === "error") {
      console.warn(`获取音乐状态失败: ${musicStatus.error}`);
      return;
    }

    // 获取歌词数据
    const lyricsData = await getLyricsData(musicStatus);

    // 合并数据
    const updateData = {
      type: "music_update",
      timestamp: Date.now(),
      music: musicStatus,
      lyrics: lyricsData,
    };

    // 发送给所有连接的客户端
    manager.broadcast(updateData);
  } catch (error) {
    console.error(`更新音乐信息时出错: ${error}`);
  }
}

/**
 * 获取歌词并发送更新
 */
export async function fetchAndUpdateLyrics(
  status: MusicStatus,
  manager: ConnectionManager
): Promise<void> {
  try {
    const lyricsData = await getLyricsData(status);

    const updateData = {
      type: "lyrics_update",
      timestamp: Date.now(),
      lyrics: lyricsData,
    };

    manager.broadcast(updateData);
  } catch (error) {
    console.error(`获取歌词并发送更新时出错: ${error}`);
  }
}