const { API, buildApiUrl } = require('./config');
const { fetchJSON } = require('./network');
const { formatPersonNames } = require('./utils');

async function searchSongs(keyword, limit = 10) {
  const res = await fetchJSON(buildApiUrl(API.search, { keyword, limit }));
  if (res.code !== 200) {
    console.log(`❌ 搜索失败: ${res.msg || '无结果'}`);
    return [];
  }
  const songs = Array.isArray(res.data) ? res.data : (res.data?.songs || []);
  if (!songs.length) console.log('❌ 搜索无结果');
  return songs.map(song => ({
    ...song,
    artists: formatPersonNames(song.artists),
  }));
}

async function interactiveSearch(rl, ask) {
  const keyword = await ask('🔍 搜索关键词: ');
  if (!keyword.trim()) return null;
  const results = await searchSongs(keyword.trim(), 10);
  if (!results.length) return null;

  console.log('\n  #  歌曲名                  歌手                专辑');
  console.log('  ' + '─'.repeat(70));
  results.forEach((song, index) => {
    const num = String(index + 1).padStart(2);
    const name = song.name.slice(0, 20).padEnd(22);
    const artist = song.artists.slice(0, 16).padEnd(18);
    console.log(`  ${num} ${name} ${artist} ${song.album}`);
  });

  const pick = await ask('\n选择序号 (多个用逗号分隔, 0=取消): ');
  if (!pick.trim() || pick.trim() === '0') return null;
  return pick.split(/[,，\s]+/)
    .map(value => parseInt(value, 10))
    .filter(value => value >= 1 && value <= results.length)
    .map(value => results[value - 1]);
}

async function fetchPlaylist(playlistId) {
  const res = await fetchJSON(buildApiUrl(API.playlist, { id: playlistId }));
  if (!res.data?.tracks?.length) {
    console.log(`❌ 歌单获取失败或为空${res.msg ? `: ${res.msg}` : ''}`);
    return null;
  }
  return res.data;
}

module.exports = { searchSongs, interactiveSearch, fetchPlaylist };