const express = require('express');
const router = express.Router();
const path = require('path');
const fs = require('fs');
const multer = require('multer');
const crypto = require('crypto');

// Configure multer storage to create unique filenames
const storage = multer.diskStorage({
    destination: 'public/upload',
    filename: (req, file, cb) => {
        const originalName = path.parse(file.originalname);
        const uniqueSuffix = Date.now() + '-' + crypto.randomBytes(4).toString('hex'); // Generate a unique suffix
        const newFilename = `${originalName.name}-${uniqueSuffix}${originalName.ext}`; // Create new filename
        cb(null, newFilename); // Save the file with the new name
    }
});

const upload = multer({ storage }); // Use the custom storage configuration
const messagesFilePath = path.join(__dirname, '../messages.json');

// Function to load the appropriate language file
function getLanguageFile(language) {
    const filePath = path.join(__dirname, `../locales/guestbook/${language}.json`);
    return JSON.parse(fs.readFileSync(filePath, 'utf8'));
}

// Load previous messages from a JSON file
let messages = [];
if (fs.existsSync(messagesFilePath)) {
    messages = JSON.parse(fs.readFileSync(messagesFilePath, 'utf8'));
}

// Route for the guestbook, with language support
router.get('/:lang', (req, res) => {
    const lang = req.params.lang || 'en'; // Default to English
    let languageData;

    // Try to load the correct language file, fall back to English
    try {
        languageData = getLanguageFile(lang);
    } catch (err) {
        languageData = getLanguageFile('en');
    }

    // Render the guestbook with messages
    res.render('guestbook', { langData: languageData, messages });
});

// Endpoint to handle guestbook form submission
router.post('/new_comment', upload.single('file'), (req, res) => {
    const lang = req.params.lang || 'en'; // Get the language from the URL
    const comment = req.body.comment;
    const name = req.body.name;
    const imagePath = req.file ? path.join('/upload', req.file.filename) : null;
    const originalFilename = req.file ? req.file.originalname : null; // Get the original filename

    // Add the new message to the messages array
    messages.push({ name, comment, imagePath, originalFilename });

    // Save messages to a JSON file
    try {
        fs.writeFileSync(messagesFilePath, JSON.stringify(messages, null, 2)); // Indent for readability
    } catch (error) {
        console.error('Error writing to messages.json:', error);
    }

    res.redirect(`/guestbook/${lang}`); // Redirect to the guestbook page with language
});

module.exports = router;