import express from 'express';
import cors from 'cors';
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';

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

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

app.use(cors());
app.use(express.json());

// Log every request
app.use((req, res, next) => {
    console.log(`${new Date().toISOString()} - ${req.method} ${req.url}`);
    next();
});

// Helper to read data
const readData = () => {
    try {
        if (!fs.existsSync(DATA_FILE)) {
            return [];
        }
        const data = fs.readFileSync(DATA_FILE, 'utf8');
        return JSON.parse(data);
    } catch (err) {
        console.error("Error reading data:", err);
        return [];
    }
};

// Helper to write data
const writeData = (data) => {
    try {
        fs.writeFileSync(DATA_FILE, JSON.stringify(data, null, 2), 'utf8');
    } catch (err) {
        console.error("Error writing data:", err);
    }
};

// GET all quotes
app.get('/api/quotes', (req, res) => {
    const quotes = readData();
    res.json(quotes);
});

// POST a new or updated quote
app.post('/api/quotes', (req, res) => {
    const newQuote = req.body;
    let quotes = readData();

    const existingIndex = quotes.findIndex(q => q.id === newQuote.id);
    if (existingIndex >= 0) {
        quotes[existingIndex] = newQuote; // Update
    } else {
        quotes.push(newQuote); // Add new
    }

    writeData(quotes);
    res.status(201).json(newQuote);
});

// DELETE a quote
app.delete('/api/quotes/:id', (req, res) => {
    const idToDelete = parseInt(req.params.id) || req.params.id; // Handle number or string
    let quotes = readData();

    const initialLength = quotes.length;
    quotes = quotes.filter(q => q.id != idToDelete);

    if (quotes.length < initialLength) {
        writeData(quotes);
        res.status(200).json({ message: "Quote deleted successfully" });
    } else {
        res.status(404).json({ message: "Quote not found" });
    }
});

// Serve frontend static files
app.use(express.static(path.join(__dirname, 'dist')));

// Fallback for SPA (React Router, etc.)
app.get(/(.*)/, (req, res) => {
    res.sendFile(path.join(__dirname, 'dist', 'index.html'));
});

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