const express = require('express');
const fs = require('fs');
const path = require('path');
const app = express();
const port = 3000;

// Serve static files from a 'public' directory (for HTML, CSS)
app.use(express.static('public'));

// Video streaming endpoint
app.get('/video/:filename', (req, res) => {
  const filename = req.params.filename;
  const videoPath = path.join(__dirname, 'videos', filename);

  // Check if file exists
  fs.stat(videoPath, (err, stats) => {
    if (err) {
      console.error('File not found:', err);
      return res.status(404).send('Video not found');
    }

    // Get file size
    const fileSize = stats.size;
    const range = req.headers.range;

    // Handle range requests (for video seeking)
    if (range) {
      const parts = range.replace(/bytes=/, '').split('-');
      const start = parseInt(parts[0], 10);
      const end = parts[1] ? parseInt(parts[1], 10) : fileSize - 1;
      const chunkSize = (end - start) + 1;
      const file = fs.createReadStream(videoPath, { start, end });
      console.log("here")

      // Set proper headers for streaming
      res.writeHead(206, {
        'Content-Range': `bytes ${start}-${end}/${fileSize}`,
        'Accept-Ranges': 'bytes',
        'Content-Length': chunkSize,
        'Content-Type': 'video/mp4'
      });

      file.pipe(res);
    } else {
      // If no range requested, send the entire file
      res.writeHead(200, {
        'Content-Length': fileSize,
        'Content-Type': 'video/mp4'
      });
      fs.createReadStream(videoPath).pipe(res);
    }
  });
});

// HTML page to display video player
app.get('/', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'index.html'));
});

app.listen(port, () => {
  console.log(`Server running at http://localhost:${port}`);
});