import express from 'express';
import cors from 'cors';
import { resolve, dirname } from 'path';
import { fileURLToPath } from 'url';
import { existsSync } from 'fs';
import { initDb } from './db.js';
import mapsRouter from './routes/maps.js';
import hexesRouter from './routes/hexes.js';

const __dirname = dirname(fileURLToPath(import.meta.url));
const PORT = Number(process.env.PORT) || 3002;
const DIST_DIR = resolve(__dirname, '..', 'dist');
const TILES_DIR = resolve(__dirname, '..', 'tiles');
const PUBLIC_TILES_DIR = resolve(__dirname, '..', 'public', 'tiles');

async function main() {
  await initDb();

  const app = express();
  app.use(cors());
  app.use(express.json({ limit: '10mb' }));

  // API routes
  app.use('/api/v1/maps', mapsRouter);
  app.use('/api/v1/maps', hexesRouter);

  // Serve tiles (check multiple locations)
  const tilesPath = existsSync(TILES_DIR) ? TILES_DIR : PUBLIC_TILES_DIR;
  if (existsSync(tilesPath)) {
    app.use('/tiles', express.static(tilesPath, { maxAge: '30d', immutable: true }));
    console.log(`[server] Serving tiles from ${tilesPath}`);
  }

  // Serve static frontend
  if (existsSync(DIST_DIR)) {
    app.use(express.static(DIST_DIR));
    // SPA fallback (Express 5 syntax)
    app.get('/{*splat}', (_req, res) => {
      res.sendFile(resolve(DIST_DIR, 'index.html'));
    });
    console.log(`[server] Serving frontend from ${DIST_DIR}`);
  }

  app.listen(PORT, () => {
    console.log(`[server] Hexifyer running on http://localhost:${PORT}`);
  });
}

main().catch(err => {
  console.error('Failed to start:', err);
  process.exit(1);
});