import express from 'express';
import fs from 'fs';
import path from 'path';
import { bundle } from '@remotion/bundler';
import { renderMedia, selectComposition } from '@remotion/renderer';

const app = express();
app.use(express.json());

const OUTPUT_DIR = './out';
if (!fs.existsSync(OUTPUT_DIR)) fs.mkdirSync(OUTPUT_DIR);

app.post('/render', async (req, res) => {
  try {
    const inputProps = req.body || {}; // pass your script from frontend
    const entryPoint = './remotion/src/index.tsx';

    const bundled = await bundle({ entryPoint });

    const composition = await selectComposition({
      serveUrl: bundled,
      id: 'VideoComposition', // MUST MATCH your index.tsx Composition id
      inputProps,
      onBrowserDownload: (progress) => {
        console.log(`Chrome download progress: ${progress.percent.toFixed(2)}%`);
      },
    });

    console.log('=== SCENES TO RENDER ===', inputProps.script?.scenes || []);

    const outputPath = path.join(OUTPUT_DIR, `${composition.id}.mp4`);

    await renderMedia({
      serveUrl: bundled,
      composition,
      outputLocation: outputPath,
      chromiumOptions: {
        enableMultiProcessOnLinux: true,
        args: ['--no-sandbox', '--disable-setuid-sandbox'],
      },
      inputProps,
    });

    res.download(outputPath);
  } catch (err) {
    console.error('Render error:', err);
    res.status(500).json({ error: err.message });
  }
});

app.listen(7860, () => console.log('🚀 Server running on port 7860'));