const express = require('express');
const cors = require('cors');
const fs = require('fs');
const path = require('path');

const app = express();
const PORT = 3001;
const DATA_FILE = path.join(__dirname, 'data.json');

app.use(cors());
app.use(express.json());
app.use(express.static(path.join(__dirname, 'dist')));

// Get all data
app.get('/api/meals', (req, res) => {
  try {
    const data = JSON.parse(fs.readFileSync(DATA_FILE, 'utf8'));
    res.json(data);
  } catch (err) {
    res.json({ 
      meals: [[Array(7).fill('').map(() => Array(4).fill(''))], [Array(7).fill('').map(() => Array(4).fill(''))]], 
      favorites: [], 
      history: [] 
    });
  }
});

// Save meals and optionally add to history
app.post('/api/meals', (req, res) => {
  try {
    const data = fs.existsSync(DATA_FILE) ? JSON.parse(fs.readFileSync(DATA_FILE, 'utf8')) : {};
    data.meals = req.body.meals;
    if (req.body.addToHistory) {
      if (!data.history) data.history = [];
      data.history.unshift({
        week: req.body.meals[0],
        date: new Date().toISOString()
      });
      // Keep last 8 weeks
      data.history = data.history.slice(0, 8);
    }
    fs.writeFileSync(DATA_FILE, JSON.stringify(data, null, 2));
    res.json({ success: true });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// Toggle favorite
app.post('/api/favorites', (req, res) => {
  try {
    const data = fs.existsSync(DATA_FILE) ? JSON.parse(fs.readFileSync(DATA_FILE, 'utf8')) : {};
    if (!data.favorites) data.favorites = [];
    
    const { meal, day, mealType } = req.body;
    const existing = data.favorites.find(f => f.meal === meal);
    
    if (existing) {
      data.favorites = data.favorites.filter(f => f.meal !== meal);
    } else {
      data.favorites.push({ meal, day, mealType, date: new Date().toISOString() });
    }
    
    fs.writeFileSync(DATA_FILE, JSON.stringify(data, null, 2));
    res.json({ success: true, favorites: data.favorites });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// Get favorites
app.get('/api/favorites', (req, res) => {
  try {
    const data = fs.existsSync(DATA_FILE) ? JSON.parse(fs.readFileSync(DATA_FILE, 'utf8')) : {};
    res.json({ favorites: data.favorites || [] });
  } catch (err) {
    res.json({ favorites: [] });
  }
});

// Get history
app.get('/api/history', (req, res) => {
  try {
    const data = fs.existsSync(DATA_FILE) ? JSON.parse(fs.readFileSync(DATA_FILE, 'utf8')) : {};
    res.json({ history: data.history || [] });
  } catch (err) {
    res.json({ history: [] });
  }
});

// Get notes
app.get('/api/notes', (req, res) => {
  try {
    const data = fs.existsSync(DATA_FILE) ? JSON.parse(fs.readFileSync(DATA_FILE, 'utf8')) : {};
    res.json({ notes: data.notes || {} });
  } catch (err) {
    res.json({ notes: {} });
  }
});

// Save notes
app.post('/api/notes', (req, res) => {
  try {
    const data = fs.existsSync(DATA_FILE) ? JSON.parse(fs.readFileSync(DATA_FILE, 'utf8')) : {};
    data.notes = req.body.notes;
    fs.writeFileSync(DATA_FILE, JSON.stringify(data, null, 2));
    res.json({ success: true });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// Serve React app for all other routes
app.get('/{*path}', (req, res) => {
  res.sendFile(path.join(__dirname, 'dist', 'index.html'));
});

app.get('/', (req, res) => {
  res.sendFile(path.join(__dirname, 'dist', 'index.html'));
});

app.listen(PORT, '0.0.0.0', () => {
  console.log(`Server running on port ${PORT}`);
});