import { getQuery, createError } from 'h3'
import axios from 'axios'

export default defineEventHandler(async (event) => {
  const query = getQuery(event)
  const url = query.url as string

  if (!url || !url.includes('kugou.com')) {
    throw createError({
      statusCode: 400,
      message: 'Invalid Kugou URL'
    })
  }

  try {
    // 1. 获取重定向后的最终URL或HTML内容
    const response = await axios.get(url, {
      headers: {
        'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1'
      }
    })
    
    // 很多时候链接会跳转，或者HTML里面有 hash 变量
    const html = response.data
    // 尝试正则匹配 "hash":"xxx" 或者 hash: 'xxx'
    const hashMatch = html.match(/"hash"\s*:\s*"([a-zA-Z0-9]+)"/i) || html.match(/hash\s*=\s*"([a-zA-Z0-9]+)"/i) || html.match(/"320hash"\s*:\s*"([a-zA-Z0-9]+)"/i)
    const albumMatch = html.match(/"album_id"\s*:\s*(\d+)/i)
    
    if (hashMatch && hashMatch[1]) {
      const hash = hashMatch[1]
      // 用 hash 再次查询歌曲详情或者直接返回
      // 我们可以调用移动端 track info API
      const infoUrl = `http://m.kugou.com/app/i/getSongInfo.php?cmd=playInfo&hash=${hash}`
      const infoRes = await axios.get(infoUrl, { validateStatus: () => true })
      
      if (infoRes.data && infoRes.data.songName) {
        return {
          id: hash,
          title: infoRes.data.songName,
          artist: infoRes.data.singerName,
          cover: infoRes.data.imgUrl ? infoRes.data.imgUrl.replace('{size}', '150') : '',
          duration: infoRes.data.timeLength * 1000,
          musicPlatform: 'kugou',
          musicId: hash,
          hasUrl: true,
          isVip: infoRes.data.privilege >= 10,
          sourceInfo: {
            source: 'kugou',
            originalId: hash,
            fetchedAt: new Date()
          }
        }
      }
      
      // 如果 getSongInfo 失败，我们只返回 hash
      return {
        id: hash,
        title: "解析成功，请点击投稿",
        artist: "未知歌手",
        musicPlatform: 'kugou',
        musicId: hash,
        hasUrl: true,
        sourceInfo: {
          source: 'kugou',
          originalId: hash,
          fetchedAt: new Date()
        }
      }
    }

    throw createError({
      statusCode: 404,
      message: 'Cannot find song hash in the provided link'
    })
  } catch (error: any) {
    throw createError({
      statusCode: 500,
      message: error.message || 'Failed to parse link'
    })
  }
})