const express = require('express');
const { authenticateToken } = require('../middleware/auth');

const router = express.Router();

const VOTE_APP_URL = process.env.VOTE_APP_URL;
const VOTE_APP_API_KEY = process.env.VOTE_APP_API_KEY;

router.get('/:sessionId', authenticateToken, async (req, res) => {
  const { sessionId } = req.params;
  if (!VOTE_APP_URL) {
    return res.status(503).json({ error: 'Vote app not configured' });
  }

  try {
    const upstream = await fetch(`${VOTE_APP_URL}/stickerwalls/${sessionId}.png`);
    if (!upstream.ok) {
      return res.status(upstream.status).end();
    }
    res.set('Content-Type', 'image/png');
    const cacheControl = upstream.headers.get('cache-control');
    if (cacheControl) {
      res.set('Cache-Control', cacheControl);
    }
    const buffer = Buffer.from(await upstream.arrayBuffer());
    res.send(buffer);
  } catch (err) {
    console.error('Sticker wall GET proxy error:', err.message);
    res.status(502).json({ error: 'Failed to fetch sticker wall' });
  }
});

router.post('/:sessionId/render', authenticateToken, async (req, res) => {
  const { sessionId } = req.params;
  if (!VOTE_APP_URL || !VOTE_APP_API_KEY) {
    return res.status(503).json({ error: 'Vote app not configured' });
  }

  try {
    const upstream = await fetch(`${VOTE_APP_URL}/api/stickerwalls/${sessionId}/render`, {
      method: 'POST',
      headers: { 'X-API-Key': VOTE_APP_API_KEY },
    });
    if (!upstream.ok) {
      return res.status(upstream.status).end();
    }
    res.set('Content-Type', 'image/png');
    const rendered = upstream.headers.get('x-sticker-wall-rendered');
    if (rendered) {
      res.set('X-Sticker-Wall-Rendered', rendered);
    }
    const buffer = Buffer.from(await upstream.arrayBuffer());
    res.send(buffer);
  } catch (err) {
    console.error('Sticker wall render proxy error:', err.message);
    res.status(502).json({ error: 'Failed to render sticker wall' });
  }
});

module.exports = router;