const express = require('express');
const axios = require('axios');
const app = express();
const PORT = process.env.PORT || 7860;

const SPOTIFY_API = {
  BASE: 'https://api.spotify.com/v1',
  AUTH: 'https://accounts.spotify.com/api/token',
  CLIENT_ID: 'b0cdfaef5b0b401299244ef88df29ffb',
  CLIENT_SECRET: '3e5949b78a214aecb2558b861911c1a9'
};

const FAB_DL_API = 'https://api.fabdl.com';

let spotifyToken = null;
let tokenExpiry = null;

async function getSpotifyToken() {
  if (spotifyToken && Date.now() < tokenExpiry) {
    return spotifyToken;
  }

  try {
    const authString = Buffer.from(`${SPOTIFY_API.CLIENT_ID}:${SPOTIFY_API.CLIENT_SECRET}`).toString('base64');
    const response = await axios.post(SPOTIFY_API.AUTH, 'grant_type=client_credentials', {
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
        'Authorization': `Basic ${authString}`
      }
    });
    spotifyToken = response.data.access_token;
    tokenExpiry = Date.now() + (response.data.expires_in * 1000);
    return spotifyToken;
  } catch (error) {
    console.error(error);
    throw new Error('Failed to get Spotify token');
  }
}

function formatDuration(ms) {
  const minutes = Math.floor(ms / 60000);
  const seconds = Math.floor((ms % 60000) / 1000);
  return `${minutes}:${seconds.toString().padStart(2, '0')}`;
}

app.get('/api/spotify', async (req, res) => {
  try {
    const { url, search } = req.query;

    if (url) {
      const token = await getSpotifyToken();
      const trackId = url.split('/').pop().split('?')[0];
      const trackResponse = await axios.get(`${SPOTIFY_API.BASE}/tracks/${trackId}`, {
        headers: { 'Authorization': `Bearer ${token}` }
      });
      
      const fabResponse = await axios.get(`${FAB_DL_API}/spotify/get?url=${url}`);
      const downloadResponse = await axios.get(
        `${FAB_DL_API}/spotify/mp3-convert-task/${fabResponse.data.result.gid}/${fabResponse.data.result.id}`
      );

      res.json({
        title: trackResponse.data.name,
        artist: trackResponse.data.artists.map(a => a.name).join(', '),
        duration: formatDuration(trackResponse.data.duration_ms),
        cover: trackResponse.data.album.images[0]?.url,
        downloadUrl: `${FAB_DL_API}${downloadResponse.data.result.download_url}`
      });

    } else if (search) {
      const token = await getSpotifyToken();
      const searchResponse = await axios.get(
        `${SPOTIFY_API.BASE}/search?q=${encodeURIComponent(search)}&type=track&limit=10`,
        { headers: { 'Authorization': `Bearer ${token}` } }
      );

      const tracks = searchResponse.data.tracks.items.map(track => ({
        id: track.id,
        title: track.name,
        artist: track.artists.map(a => a.name).join(', '),
        duration: formatDuration(track.duration_ms),
        cover: track.album.images[0]?.url,
        url: track.external_urls.spotify
      }));

      res.json(tracks);
    } else {
      res.status(400).json({ error: 'Missing url or search parameter' });
    }
  } catch (error) {
    console.error(error);
    res.status(500).json({ error: 'Internal server error' });
  }
});

app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});