const path = require('path');
const express = require('express');
const session = require('express-session');
const pgSession = require('connect-pg-simple')(session);

const { pool, initSchema, checkConnection } = require('./db');
const { runSeed } = require('./seed');
const { seedAdmin } = require('./seed-admin');
const { loadUser } = require('./middleware/auth');
const healthRoutes = require('./routes/health');
const shopRoutes = require('./routes/shop');
const authRoutes = require('./routes/auth');
const adminRoutes = require('./routes/admin');

const PORT = process.env.PORT || 3000;
const HOST = process.env.HOST || '0.0.0.0';
const isProduction = process.env.NODE_ENV === 'production';

async function start() {
  await checkConnection();
  await initSchema();
  await runSeed();
  await seedAdmin();

  const app = express();

  if (process.env.TRUST_PROXY === '1' || isProduction) {
    app.set('trust proxy', 1);
  }

  app.set('view engine', 'ejs');
  app.set('views', path.join(__dirname, 'views'));

  app.use(healthRoutes);
  app.use(express.static(path.join(__dirname, 'public')));
  app.use(express.urlencoded({ extended: true }));

  app.use(
    session({
      store: new pgSession({
        pool,
        createTableIfMissing: true,
        tableName: 'session',
      }),
      secret: process.env.SESSION_SECRET || 'dev-secret-change-in-production',
      resave: false,
      saveUninitialized: false,
      cookie: {
        maxAge: 7 * 24 * 60 * 60 * 1000,
        httpOnly: true,
        sameSite: 'lax',
        secure: isProduction,
      },
    })
  );

  app.use(loadUser);
  app.use('/', shopRoutes);
  app.use('/', authRoutes);
  app.use('/admin', adminRoutes);

  app.use((req, res) => {
    res.status(404).render('error', {
      title: 'Не найдено',
      message: 'Страница не найдена',
      code: 404,
    });
  });

  app.use((err, req, res, _next) => {
    console.error(err);
    res.status(500).render('error', {
      title: 'Ошибка',
      message: 'Внутренняя ошибка сервера',
      code: 500,
    });
  });

  const server = app.listen(PORT, HOST, () => {
    console.log(`Магазин: http://${HOST}:${PORT} (PostgreSQL)`);
  });

  server.on('error', (err) => {
    console.error('Не удалось запустить сервер:', err.message);
    process.exit(1);
  });
}

start().catch((err) => {
  if (err.code === 'ECONNREFUSED' && String(err.message).includes('5432')) {
    console.error('PostgreSQL недоступен на 127.0.0.1:5432');
    console.error('  systemctl start postgresql');
    console.error('  bash scripts/setup-postgres-ubuntu.sh');
    console.error('  Проверьте DATABASE_URL в .env');
  } else {
    console.error('Ошибка запуска:', err.message);
  }
  process.exit(1);
});