import 'dotenv/config';
import express from 'express';
import cors from 'cors';
import path from 'path';
import fs from 'fs';
import { fileURLToPath } from 'url';
import { initDb } from './db.js';
import authRoutes from './routes/auth.js';
import contentRoutes from './routes/content.js';
import uploadRoutes from './routes/upload.js';
import multer from 'multer';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const PORT = process.env.PORT || 3001;
const UPLOAD_DIR = process.env.UPLOAD_DIR || path.join(__dirname, 'uploads');
// Public URL prefix on Apache (e.g. /citpl_website). Leave empty if site is at domain root.
const SITE_BASE = (process.env.SITE_BASE || '/citpl_website').replace(/\/$/, '');
const distDir = path.join(__dirname, '..', 'dist');
const serveStatic =
  process.env.SERVE_STATIC === '1' ||
  process.env.SERVE_STATIC === 'true' ||
  (process.env.SERVE_STATIC !== '0' && fs.existsSync(distDir));

initDb();

const app = express();

app.use(cors({
  origin: process.env.CORS_ORIGIN || true,
  credentials: true,
}));

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

function mountApp(base) {
  const prefix = base || '';

  app.use(`${prefix}/uploads`, express.static(UPLOAD_DIR));

  app.get(`${prefix}/api/health`, (_req, res) => {
    res.json({ status: 'ok', timestamp: new Date().toISOString() });
  });

  app.use(`${prefix}/api/auth`, authRoutes);
  app.use(`${prefix}/api/content`, contentRoutes);
  app.use(`${prefix}/api/upload`, uploadRoutes);

  if (serveStatic) {
    app.use(prefix || '/', express.static(distDir));
  }
}

// Root paths — used when Apache proxies /citpl_website/api → http://127.0.0.1:3001/api
mountApp('');
// Prefixed paths — used when Apache proxies /citpl_website → http://127.0.0.1:3001/citpl_website
if (SITE_BASE) {
  mountApp(SITE_BASE);
}

app.use((err, _req, res, _next) => {
  if (err instanceof multer.MulterError && err.code === 'LIMIT_FILE_SIZE') {
    return res.status(413).json({ error: 'File too large (max 50MB)', code: 'FILE_TOO_LARGE' });
  }
  console.error(err);
  res.status(500).json({ error: err.message || 'Internal server error', code: 'SERVER_ERROR' });
});

app.listen(PORT, () => {
  console.log(`CITPL Node server on http://localhost:${PORT}`);
  console.log(`  API:  /api/* and ${SITE_BASE || ''}/api/*`);
  console.log(`  Auth: ADMIN_USERNAME from .env (${process.env.ADMIN_USERNAME || 'admin'})`);
  if (serveStatic) {
    console.log(`  Static: ${distDir}`);
  }
});