/**
 * Settings Routes
 * Handles logo upload and settings
 */
const express = require('express');
const router = express.Router();
const multer = require('multer');
const path = require('path');
const fs = require('fs').promises;

const { pool } = require('../config/database');

// Configure multer for logo upload
const storage = multer.diskStorage({
    destination: async (req, file, cb) => {
        const uploadDir = path.join(__dirname, '..', '..', 'public', 'uploads');
        try {
            await fs.mkdir(uploadDir, { recursive: true });
        } catch (err) {
            console.error('Error creating upload directory:', err);
        }
        cb(null, uploadDir);
    },
    filename: (req, file, cb) => {
        cb(null, 'company-logo.png');
    }
});

const upload = multer({
    storage: storage,
    limits: { fileSize: 5 * 1024 * 1024 },
    fileFilter: (req, file, cb) => {
        if (file.mimetype.startsWith('image/')) {
            cb(null, true);
        } else {
            cb(new Error('Only image files are allowed'));
        }
    }
});

// GET logo info
router.get('/logo-info', async (req, res) => {
    try {
        const logoPath = path.join(__dirname, '..', '..', 'public', 'uploads', 'company-logo.png');
        try {
            await fs.access(logoPath);
            res.json({ hasLogo: true, logoPath: '/uploads/company-logo.png' });
        } catch {
            res.json({ hasLogo: false });
        }
    } catch (error) {
        console.error('Error checking logo:', error);
        res.status(500).json({ error: 'Error checking logo' });
    }
});

// POST upload logo
router.post('/upload-logo', upload.single('logo'), async (req, res) => {
    try {
        if (!req.file) {
            return res.status(400).json({ error: 'No file uploaded' });
        }
        res.json({ 
            message: 'Logo uploaded successfully',
            path: '/uploads/company-logo.png'
        });
    } catch (error) {
        console.error('Upload error:', error);
        res.status(500).json({ error: 'Error uploading logo' });
    }
});

// GET /api/settings/:key — liefert einen einzelnen Settings-Wert
router.get('/:key', async (req, res) => {
    try {
        const result = await pool.query(
            'SELECT value FROM settings WHERE key = $1',
            [req.params.key]
        );
        if (result.rows.length === 0) {
            return res.json({ key: req.params.key, value: null });
        }
        res.json({ key: req.params.key, value: result.rows[0].value });
    } catch (error) {
        console.error('Error fetching setting:', error);
        res.status(500).json({ error: 'Error fetching setting' });
    }
});

// PUT /api/settings/:key — setzt einen Settings-Wert (upsert)
router.put('/:key', express.json(), async (req, res) => {
    const { value } = req.body;
    if (typeof value !== 'string') {
        return res.status(400).json({ error: 'value must be a string' });
    }
    try {
        await pool.query(
            `INSERT INTO settings (key, value)
             VALUES ($1, $2)
             ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value`,
            [req.params.key, value]
        );
        res.json({ success: true, key: req.params.key, value });
    } catch (error) {
        console.error('Error saving setting:', error);
        res.status(500).json({ error: 'Error saving setting' });
    }
});

module.exports = router;