const express = require('express');
const fs = require('fs').promises;
const path = require('path');

const app = express();
const PORT = 3000;
const RECIPES_DIR = path.join(__dirname, 'recipes');

app.use(express.json());
app.use(express.static('public'));

// Ensure recipes directory exists
async function ensureRecipesDir() {
    try {
        await fs.access(RECIPES_DIR);
    } catch {
        await fs.mkdir(RECIPES_DIR, { recursive: true });
    }
}

// GET all recipes
app.get('/api/recipes', async (req, res) => {
    try {
        await ensureRecipesDir();
        const files = await fs.readdir(RECIPES_DIR);
        const recipes = [];
        
        for (const file of files) {
            if (file.endsWith('.json')) {
                const content = await fs.readFile(path.join(RECIPES_DIR, file), 'utf-8');
                recipes.push(JSON.parse(content));
            }
        }
        
        res.json(recipes);
    } catch (error) {
        res.status(500).json({ error: 'Failed to load recipes' });
    }
});

// GET single recipe by id
app.get('/api/recipes/:id', async (req, res) => {
    try {
        const filePath = path.join(RECIPES_DIR, `${req.params.id}.json`);
        const content = await fs.readFile(filePath, 'utf-8');
        res.json(JSON.parse(content));
    } catch (error) {
        res.status(404).json({ error: 'Recipe not found' });
    }
});

// POST new recipe
app.post('/api/recipes', async (req, res) => {
    try {
        await ensureRecipesDir();
        const recipe = req.body;
        
        // Generate ID if not provided
        if (!recipe.id) {
            recipe.id = Date.now().toString(36) + Math.random().toString(36).substr(2);
        }
        
        recipe.createdAt = recipe.createdAt || new Date().toISOString();
        recipe.updatedAt = new Date().toISOString();
        
        const filePath = path.join(RECIPES_DIR, `${recipe.id}.json`);
        await fs.writeFile(filePath, JSON.stringify(recipe, null, 2));
        
        res.status(201).json(recipe);
    } catch (error) {
        res.status(500).json({ error: 'Failed to save recipe' });
    }
});

// PUT update recipe
app.put('/api/recipes/:id', async (req, res) => {
    try {
        const recipe = req.body;
        recipe.id = req.params.id;
        recipe.updatedAt = new Date().toISOString();
        
        const filePath = path.join(RECIPES_DIR, `${recipe.id}.json`);
        await fs.writeFile(filePath, JSON.stringify(recipe, null, 2));
        
        res.json(recipe);
    } catch (error) {
        res.status(500).json({ error: 'Failed to update recipe' });
    }
});

// DELETE recipe
app.delete('/api/recipes/:id', async (req, res) => {
    try {
        const filePath = path.join(RECIPES_DIR, `${req.params.id}.json`);
        await fs.unlink(filePath);
        res.json({ success: true });
    } catch (error) {
        res.status(500).json({ error: 'Failed to delete recipe' });
    }
});

app.listen(PORT, () => {
    console.log(`🍳 Cookbook server running at http://localhost:${PORT}`);
});