const express = require('express');
const cors = require('cors');
const bodyParser = require('body-parser');
const path = require('path');
require('dotenv').config({ override: false });

const app = express();

// Import middleware
const requestLogger = require('./middleware/requestLogger');
const errorHandler = require('./middleware/errorHandler');

// Middleware
app.use(cors());
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(requestLogger); // Log all requests

// Import routes
const plantRoutes = require('./routes/plantRoutes');
const surveyRoutes = require('./routes/surveyRoutes');
const informantRoutes = require('./routes/informantRoutes');
const locationRoutes = require('./routes/locationRoutes');
const usageCategoryRoutes = require('./routes/usageCategoryRoutes');
const conditionRoutes = require('./routes/conditionRoutes');
const plantPartRoutes = require('./routes/plantPartRoutes');
const ingredientRoutes = require('./routes/ingredientRoutes');
const animalTypeRoutes = require('./routes/animalTypeRoutes');
const searchRoutes = require('./routes/searchRoutes');
const statsRoutes = require('./routes/statsRoutes');
const mediaRoutes = require('./routes/mediaRoutes');

// Use routes
app.use('/api/plants', plantRoutes);
app.use('/api/surveys', surveyRoutes);
app.use('/api/informants', informantRoutes);
app.use('/api/locations', locationRoutes);
app.use('/api/usage-categories', usageCategoryRoutes);
app.use('/api/conditions', conditionRoutes);
app.use('/api/plant-parts', plantPartRoutes);
app.use('/api/ingredients', ingredientRoutes);
app.use('/api/animal-types', animalTypeRoutes);
app.use('/api/search', searchRoutes);
app.use('/api/stats', statsRoutes);
app.use('/api/media', mediaRoutes);

// Health check endpoint
app.get('/api/health', (req, res) => {
  res.status(200).json({ status: 'OK', message: 'Server is running' });
});

// Debug: list files in frontend/build/images
app.get('/api/debug/images', (req, res) => {
  const fs = require('fs');
  const imgDir = path.join(__dirname, '../frontend/build/images');
  try {
    const files = fs.existsSync(imgDir) ? fs.readdirSync(imgDir) : [];
    res.json({ path: imgDir, exists: fs.existsSync(imgDir), files });
  } catch (e) {
    res.json({ error: e.message });
  }
});

// Serve React frontend - always attempt if build exists
const fs = require('fs');
const buildPath = path.join(__dirname, '../frontend/build');
const indexPath = path.join(buildPath, 'index.html');

console.log(`Frontend build path: ${buildPath}`);
console.log(`index.html exists: ${fs.existsSync(indexPath)}`);

if (fs.existsSync(indexPath)) {
  app.use(express.static(buildPath));
  app.use((req, res, next) => {
    if (req.path.startsWith('/api')) return next();
    res.sendFile(indexPath, (err) => {
      if (err) {
        console.error('sendFile error:', err.message);
        next(err);
      }
    });
  });
}

// Error handling middleware (must be last)
app.use(errorHandler);

// 404 fallback
app.use((req, res) => {
  res.status(404).json({ error: 'Route not found' });
});

const PORT = process.env.NODE_ENV === 'production' ? 7860 : (process.env.PORT || 5000);

app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
  console.log(`Health check: http://localhost:${PORT}/api/health`);
});

module.exports = app;