import express from 'express';
import path from 'path';
import { fileURLToPath } from 'url';
import fs from 'fs/promises';

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

export function startServer() {
    const app = express();
    const PORT = process.env.SERVER_PORT || 3000;
    const HOST = process.env.SERVER_HOST || '0.0.0.0';
    const CACHE_DIR = process.env.CACHE_LOCATION || './cache';

    // Serve category tree JSON
    app.get('/api/categories', async (req, res) => {
        try {
            const treePath = path.join(CACHE_DIR, 'category_tree.json');
            const data = await fs.readFile(treePath, 'utf-8');
            res.json(JSON.parse(data));
        } catch (err) {
            res.status(500).json({ error: 'Failed to load category tree' });
        }
    });

    // Serve category images
    app.get('/img/cat/:id.avif', (req, res) => {
        const { id } = req.params;
        const imagePath = path.join(CACHE_DIR, 'img', 'categories', `${id}.avif`);
        res.sendFile(path.resolve(imagePath), (err) => {
            if (err) {
                res.status(404).send('Image not found');
            }
        });
    });

    // Serve index.html
    app.get('/', (req, res) => {
        const htmlPath = path.join(__dirname, 'index.html');
        console.log('Attempting to serve:', htmlPath);
        res.sendFile(htmlPath, (err) => {
            if (err) {
                console.error('Error serving index.html:', err);
                res.status(500).send('Error loading page');
            }
        });
    });

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