/**
 * routes/hunt-log.js — receives hunt telemetry from the client and appends it
 * to a daily log file on the server. Debug aid: confirms spawns / detections /
 * captures are firing server-side even when something looks wrong on-device.
 *
 * Wire in server.js:
 *   import huntLogRoutes from './routes/hunt-log.js';
 *   app.use('/api/hunt-log', huntLogRoutes);
 *
 * Log file: logs/hunt-YYYY-MM-DD.log  (one JSON object per line)
 */
import { Router } from 'express';
import { appendFile, mkdir } from 'node:fs/promises';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const LOG_DIR = join(__dirname, '..', 'logs');

const router = Router();

// Accept a single event or a batch. Keep it small + permissive.
router.post('/', async (req, res) => {
  try {
    const body = req.body || {};
    const events = Array.isArray(body.events) ? body.events : [body];
    const day = new Date().toISOString().slice(0, 10);
    const file = join(LOG_DIR, `hunt-${day}.log`);

    await mkdir(LOG_DIR, { recursive: true });
    const lines = events.map(e => JSON.stringify({
      t: new Date().toISOString(),
      ip: req.ip,
      type: e.type || 'unknown',
      ghost: e.ghost || null,
      color: e.color || null,
      rarity: e.rarity || null,
      haunt: typeof e.haunt === 'number' ? Math.round(e.haunt) : null,
      pos: e.pos || null,          // {x,y,z} spawn position when present
      session: e.session || null,  // client session id
    })).join('\n') + '\n';

    await appendFile(file, lines, 'utf8');
    res.json({ ok: true, logged: events.length });
  } catch (err) {
    // never let logging break the hunt
    console.error('hunt-log error:', err.message);
    res.status(200).json({ ok: false });
  }
});

export default router;