/**
 * TODO:
 * - create basic express server
 * - connect to mysql database
 * - create proper docker compose file and dockerfile to setup mysql, express server
 * - make api to look like this:
 * /v1/api/rest/video/PAGINATE
Method POST

body
{
    "payload": {},
    "page": 1,
    "limit": 10
}
Response
http code 200
{
    "error": false,
    "list": [
        {
            "id": 1,
            "title": "Rune raises $100,000 for marketing through NFT butterflies sale",
            "photo": "https://picsum.photos/200/200",
            "user_id": 1,
            "username": "boss",
            "create_at": "2022-01-01",
            "update_at": "2022-01-01T04:00:00.000Z",
            "like": 10
        }
    ],
    "page": 1,
    "limit": 10,
    "total": 112,
    "num_pages": 12
}

 */

const express = require('express');
const mysql = require('mysql2/promise');
const app = express();

// Middleware to parse JSON bodies
app.use(express.json());

// Database connection configuration
const dbConfig = {
  host: process.env.DB_HOST || 'mysql',
  user: process.env.DB_USER || 'user',
  password: process.env.DB_PASSWORD || 'password',
  database: process.env.DB_NAME || 'videodb'
};

// API endpoint for video pagination
app.get('/', async (req, res) => {
    res.send('Hello World');
});

app.post('/v1/api/rest/video/PAGINATE', async (req, res) => {
  try {
    const page = parseInt(req.body.page) || 1;
    const limit = parseInt(req.body.limit) || 10;
    const offset = (page - 1) * limit;

    const connection = await mysql.createConnection(dbConfig);

    // Get total count
    const [countResult] = await connection.execute(
      'SELECT COUNT(*) as total FROM videos'
    );
    const total = countResult[0].total;

    // Fix: Use a different query format for LIMIT
    const [rows] = await connection.query(
      `SELECT 
        v.id, v.title, v.photo, v.user_id,
        v.created_at, v.updated_at, v.likes
      FROM videos v
      LIMIT ${offset}, ${limit}`
    );

    await connection.end();

    res.json({
      error: false,
      list: rows,
      page: page,
      limit: limit,
      total,
      num_pages: Math.ceil(total / limit)
    });
  } catch (error) {
    console.error('Error:', error);
    res.status(500).json({ error: true, message: 'Internal server error' });
  }
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});