import express from 'express';
import session from 'express-session';
import cookieParser from 'cookie-parser';
import cors from 'cors';
import path from 'path';
import fs from 'fs';
import { fileURLToPath } from 'url';

import { initializeDatabase, questionnaireOps, participantOps } from './database.js';
import authRoutes from './routes/auth.js';
import adminRoutes from './routes/admin.js';
import questionnaireRoutes from './routes/questionnaire.js';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// Initialize database
initializeDatabase();

const app = express();
const PORT = process.env.PORT || 4000;
const isProduction = process.env.NODE_ENV === 'production';

// Middleware
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
app.use(cookieParser());

// CORS for development
if (!isProduction) {
  app.use(cors({
    origin: 'http://localhost:5173',
    credentials: true,
  }));
}

// Session configuration
declare module 'express-session' {
  interface SessionData {
    user?: { id: number; username: string };
    returnTo?: string;
  }
}

app.use(session({
  secret: process.env.SESSION_SECRET || 'dev-secret-change-in-production',
  resave: false,
  saveUninitialized: false,
  cookie: {
    secure: isProduction && process.env.HTTPS === 'true',
    httpOnly: true,
    maxAge: 24 * 60 * 60 * 1000, // 24 hours
    sameSite: isProduction ? 'strict' : 'lax',
  },
}));

// API Routes
app.use('/api/auth', authRoutes);
app.use('/api/admin', adminRoutes);
app.use('/api/q', questionnaireRoutes);

// Serve uploaded files
const uploadsDir = isProduction 
  ? '/app/data/uploads'
  : path.join(__dirname, '..', 'data', 'uploads');

// Ensure uploads directory exists
if (!fs.existsSync(uploadsDir)) {
  fs.mkdirSync(uploadsDir, { recursive: true });
}

app.use('/uploads', express.static(uploadsDir));

// Serve static files in production
if (isProduction) {
  const clientPath = path.join(__dirname, '../client');
  app.use(express.static(clientPath));
  
  // Helper function to generate OG tags HTML
  function generateOgTags(pageUrl: string, title: string, description: string, ogImageUrl: string | null): string {
    return `
    <meta property="og:type" content="website" />
    <meta property="og:url" content="${pageUrl}" />
    <meta property="og:title" content="${title}" />
    <meta property="og:description" content="${description}" />
    ${ogImageUrl ? `<meta property="og:image" content="${ogImageUrl}" />` : ''}
    <meta name="twitter:card" content="summary_large_image" />
    <meta name="twitter:title" content="${title}" />
    <meta name="twitter:description" content="${description}" />
    ${ogImageUrl ? `<meta name="twitter:image" content="${ogImageUrl}" />` : ''}
    `;
  }

  // Dynamic OG meta tags for questionnaire pages
  app.get('/q/:slug', (req, res) => {
    const questionnaire = questionnaireOps.findBySlug(req.params.slug);
    const indexPath = path.join(clientPath, 'index.html');
    
    if (!questionnaire) {
      res.sendFile(indexPath);
      return;
    }
    
    // Read the index.html template
    let html = fs.readFileSync(indexPath, 'utf-8');
    
    // Build meta tags
    const baseUrl = `${req.protocol}://${req.get('host')}`;
    const pageUrl = `${baseUrl}/q/${questionnaire.slug}`;
    const title = questionnaire.title;
    const description = questionnaire.description || 'Activiteiten Inventaris - Voeg activiteiten toe en stem!';
    
    // Make image URL absolute if it's a relative path
    let ogImageUrl = questionnaire.og_image;
    if (ogImageUrl && ogImageUrl.startsWith('/')) {
      ogImageUrl = `${baseUrl}${ogImageUrl}`;
    }
    
    const ogTags = generateOgTags(pageUrl, title, description, ogImageUrl);
    
    // Insert OG tags before </head>
    html = html.replace('</head>', `${ogTags}</head>`);
    
    // Update title
    html = html.replace(/<title>.*?<\/title>/, `<title>${title} - Activiteiten Inventaris</title>`);
    
    res.send(html);
  });

  // Dynamic OG meta tags for participant access pages
  app.get('/q/access/:token', (req, res) => {
    const participant = participantOps.findByToken(req.params.token);
    const indexPath = path.join(clientPath, 'index.html');
    
    if (!participant) {
      res.sendFile(indexPath);
      return;
    }
    
    const questionnaire = questionnaireOps.findById(participant.questionnaire_id);
    if (!questionnaire) {
      res.sendFile(indexPath);
      return;
    }
    
    // Read the index.html template
    let html = fs.readFileSync(indexPath, 'utf-8');
    
    // Build meta tags
    const baseUrl = `${req.protocol}://${req.get('host')}`;
    const pageUrl = `${baseUrl}/q/access/${participant.token}`;
    const title = questionnaire.title;
    
    // Get first name from participant name
    const firstName = participant.name.trim().split(/\s+/)[0] || participant.name;
    const description = questionnaire.description 
      || `Hoi ${firstName}! Voeg je ideeën toe en stem op activiteiten.`;
    
    // Make image URL absolute if it's a relative path
    let ogImageUrl = questionnaire.og_image;
    if (ogImageUrl && ogImageUrl.startsWith('/')) {
      ogImageUrl = `${baseUrl}${ogImageUrl}`;
    }
    
    const ogTags = generateOgTags(pageUrl, title, description, ogImageUrl);
    
    // Insert OG tags before </head>
    html = html.replace('</head>', `${ogTags}</head>`);
    
    // Update title
    html = html.replace(/<title>.*?<\/title>/, `<title>${title} - Activiteiten Inventaris</title>`);
    
    res.send(html);
  });
  
  // SPA fallback for other routes
  app.get('*', (_req, res) => {
    res.sendFile(path.join(clientPath, 'index.html'));
  });
}

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