require('dotenv').config();

const express = require('express');
const session = require('express-session');
const log = require('./lib/logger');
const authMiddleware = require('./lib/auth');

const app = express();
app.set('trust proxy', 1);

// Session
app.use(session({
  secret: process.env.SESSION_SECRET || 'change-me-in-env',
  resave: false,
  saveUninitialized: false,
  cookie: { maxAge: 30 * 24 * 60 * 60 * 1000 },
}));

// Static assets (before auth — always public)
app.use(express.static('public'));

// Auth routes (before auth middleware — public)
app.use('/auth', require('./routes/auth'));

// Auth middleware (protects everything below)
app.use(authMiddleware);

// Health check (extended)
const startTime = Date.now();
app.get('/health', (req, res) => {
  const mem = process.memoryUsage();
  res.json({
    status: 'ok',
    uptime: Math.floor((Date.now() - startTime) / 1000),
    memory: {
      rss: Math.round(mem.rss / 1024 / 1024) + 'MB',
      heap: Math.round(mem.heapUsed / 1024 / 1024) + '/' + Math.round(mem.heapTotal / 1024 / 1024) + 'MB',
    },
    node: process.version,
    pid: process.pid,
  });
});

// Routes
const compressRouter = require('./routes/compress');
app.use('/compress', compressRouter);

// Download endpoint
const fs = require('fs');
const path = require('path');
app.get('/download/:filename', (req, res) => {
  const filename = path.basename(req.params.filename);
  const filePath = path.join(compressRouter.DOWNLOADS_DIR, filename);
  if (!fs.existsSync(filePath)) return res.status(404).json({ error: 'Файл не найден' });
  res.download(filePath, 'compressed.zip');
});

app.use(require('./routes/parser'));
app.use('/placeholder', require('./routes/placeholder'));
app.use('/placeholder-img', require('./routes/placeholder'));
app.use(require('./routes/httpclient'));
app.use(require('./routes/redirects'));
app.use(require('./routes/svgeditor'));
app.use('/video', require('./routes/video'));
app.use(require('./routes/logs'));
app.use(require('./routes/pages'));

// Global error handler
app.use((err, req, res, next) => {
  log.error('Unhandled error', { error: err.message, stack: err.stack });
  res.status(500).json({ error: 'Внутренняя ошибка сервера' });
});

// Start server
const PORT = parseInt(process.env.PORT) || 3000;
const server = app.listen(PORT, () => {
  log.info(`Server started on http://localhost:${PORT}`);
});

// Graceful shutdown
function shutdown(signal) {
  log.info(`${signal} received, shutting down gracefully...`);
  server.close(() => {
    log.info('Server closed');
    process.exit(0);
  });
  // Force close after 10 seconds
  setTimeout(() => {
    log.warn('Forced shutdown after timeout');
    process.exit(1);
  }, 10000);
}

process.on('SIGTERM', () => shutdown('SIGTERM'));
process.on('SIGINT', () => shutdown('SIGINT'));
process.on('unhandledRejection', (err) => {
  log.error('Unhandled rejection', { error: err?.message || String(err) });
});
process.on('uncaughtException', (err) => {
  log.error('Uncaught exception', { error: err.message, stack: err.stack });
  process.exit(1);
});