const express = require('express');
const mm = require('music-metadata');
const util = require('util');
const fs = require('fs');
const path = require('path');

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

app.use(express.static('public'));
app.use('/music', express.static('music'));

const SUPPORTED_FORMATS = ['.mp3', '.mp4', '.wav', '.flac', '.ogg', '.opus']; // Add or remove formats as needed

function isSupportedFormat(filename) {
  const ext = path.extname(filename).toLowerCase();
  return SUPPORTED_FORMATS.includes(ext);
}

app.get('/tracks', async (req, res) => {
    const pageNumber = parseInt(req.query.page) || 1;
    const pageSize = 5; // Number of items per page

    fs.readdir('music', async (err, files) => {
        if (err) {
            console.error('Error reading music directory', err);
            return res.sendStatus(500);
        }

        const filteredFiles = files.filter(file => isSupportedFormat(file));
        const pageStart = (pageNumber - 1) * pageSize;
        const pageEnd = pageStart + pageSize;
        
        // Slice files for the requested page
        const pagedFiles = filteredFiles.slice(pageStart, pageEnd);

        const trackDetails = [];
        for (const file of pagedFiles) {
            const filePath = path.join(__dirname, 'music', file);
            try {
                const metadata = await mm.parseFile(filePath, { native: true });
                const artwork = metadata.common.picture && metadata.common.picture[0] ? `data:${metadata.common.picture[0].format};base64,${metadata.common.picture[0].data.toString('base64')}` : '';
                trackDetails.push({filename: file, artwork});
            } catch (error) {
                console.error(`Error reading metadata for file: ${file}`, error);
            }
        }

        res.json({tracks: trackDetails, total: filteredFiles.length});
    });
});

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