const express = require('express');
const mysql = require('mysql2');

const app = express();

const db = mysql.createConnection({
    host: 'localhost',
    user: 'root',
    password: '12345678',
    database: 'popcen', 
   
    authPlugins: {
        'caching_sha2_password': mysql.authPlugins.caching_sha2_password
    }
});

db.connect((err) => {
    if (err) {
        console.error('Database connection failed:', err.stack);
        return;
    }
    console.log('Connected to the MySQL database.');
});


app.get('/popcen', (req, res) => {

    const caseidPattern = req.query.caseidPattern + '%';
    const batchno = parseInt(req.query.batchno, 10) || 1; 
    const sql = 'SELECT id, uuid, caseid, modified_time FROM popcen WHERE caseid LIKE ? LIMIT ? OFFSET ?';
    const limit = 1000;
    const offset = (batchno - 1) * limit;
    db.query(sql, [caseidPattern, limit, offset], (err, results) => {
        if (err) {
            console.error(err);
            return res.status(500).send('Server error');
        }
        res.json(results);
    });
});



app.get('/popcenCount', (req, res) => {
    const caseidPattern = req.query.caseidPattern + '%';
    const sql = 'SELECT COUNT(id) AS count FROM popcen WHERE caseid LIKE ?';
    db.query(sql, [caseidPattern], (err, results) => {
        if (err) {
            console.error(err);
            return res.status(500).send('Server error');
        }
        res.json(results[0].count);
    });
});

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