require('dotenv').config(); 
const express = require('express');
const axios = require('axios');

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

const clientId = process.env.SPOTIFY_CLIENT_ID;
const clientSecret = process.env.SPOTIFY_CLIENT_SECRET;

// Function to get Spotify API access token
async function getAccessToken() {
  const authString = Buffer.from(`${clientId}:${clientSecret}`).toString('base64');

  try {
    const response = await axios.post(
      'https://accounts.spotify.com/api/token',
      'grant_type=client_credentials',
      {
        headers: {
          'Authorization': `Basic ${authString}`,
          'Content-Type': 'application/x-www-form-urlencoded',
        }
      }
    );
    return response.data.access_token;
  } catch (error) {
    console.error('Failed to get access token:', error.response?.data || error.message);
    throw error;
  }
}

// /search endpoint
app.get('/search', async (req, res) => {
  const query = req.query.q;
  if (!query) {
    return res.status(400).json({ error: 'Missing query parameter q' });
  }

  try {
    const token = await getAccessToken();

    const response = await axios.get('https://api.spotify.com/v1/search', {
      params: {
        q: query,
        type: 'track',
        limit: 1,
        include_external: 'audio'
      },
      headers: {
        'Authorization': `Bearer ${token}`
      }
    });

    const track = response.data.tracks.items[0];
    if (!track) {
      return res.status(404).json({ error: 'No tracks found' });
    }

    const result = {
      title: track.name,
      id: track.id,
      artists: track.artists.map(a => a.name),
      album: track.album.name,
      duration_seconds: Math.floor(track.duration_ms / 1000),
      popularity: track.popularity,
      release_date: track.album.release_date,
      spotify_url: track.external_urls.spotify,
      preview_available: Boolean(track.preview_url),
      explicit: track.explicit,
      album_type: track.album.album_type,
      total_tracks_in_album: track.album.total_tracks,
      track_number: track.track_number,
      isrc: track.external_ids.isrc,
      available_markets_count: track.available_markets.length
    };

    res.json(result);

  } catch (error) {
    console.error('Error fetching track:', error.response?.data || error.message);
    res.status(500).json({ error: 'Failed to fetch track' });
  }
});

app.get('/download', async (req, res) => {
  const trackUrl = req.query.url;
  if (!trackUrl) {
    return res.status(400).json({ error: 'Missing track URL (param: url)' });
  }

  try {
    const response = await axios.post(
      'https://spotify.downloaderize.com/wp-json/spotify-downloader/v1/fetch',
      {
        type: 'song',
        url: trackUrl
      },
      {
        headers: {
          'Content-Type': 'application/json',
          'Accept': '*/*',
          'X-Requested-With': 'XMLHttpRequest',
          // Optional spoofed headers to bypass bot protection
          'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/114.0.0.0 Safari/537.36',
          'Referer': 'https://spotify.downloaderize.com/',
          'Origin': 'https://spotify.downloaderize.com'
        }
      }
    );

    const result = response.data;
    if (!result.success) {
      return res.status(502).json({ error: 'Failed to retrieve download link' });
    }

    res.json({
      title: result.data.title,
      artist: result.data.artist,
      album: result.data.album,
      cover: result.data.cover,
      releaseDate: result.data.releaseDate,
      download: result.data.downloadLink
    });

  } catch (err) {
    console.error('Download fetch error:', err.response?.data || err.message);
    res.status(500).json({ error: 'Internal server error while fetching download' });
  }
});

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