const mariadb = require('mariadb');
const fs = require('fs');
const path = require('path');
const util = require("util")
require("dotenv").config()
const log = require("./log");


// Create a MariaDB connection pool
const pool = mariadb.createPool({
	host: process.env.DB_HOST, // Replace with your database host
	port: process.env.DB_PORT || 3306,
	user: process.env.DB_USER, // Replace with your database username
	password: process.env.DB_PASS, // Replace with your database password
	database: process.env.DB_DATABASE, // Replace with your database name
	connectionLimit: 5 // Adjust connection limit as needed
});


function runMigrations() {
	return new Promise((resolve, reject) => {
		let connection;

		pool.getConnection()
			.then(conn => {
				connection = conn;

				// Ensure a migrations table exists to track applied migrations
				return connection.query(`CREATE TABLE IF NOT EXISTS migrations (
			id INT AUTO_INCREMENT PRIMARY KEY,
			name VARCHAR(255) NOT NULL,
			applied_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
		  );`);
			})
			.then(() => {
				// Read all migration files
				const migrationDir = path.join(__dirname, 'migrations');
				const files = fs.readdirSync(migrationDir).sort(); // Sort to apply in order

				return files.reduce((promise, file) => {
					return promise.then(() => {
						const migrationName = path.basename(file);

						// Check if the migration has already been applied
						return connection.query(
							'SELECT 1 FROM migrations WHERE name = ? LIMIT 1',
							[migrationName]
						).then(([rows]) => {
							if (Object.keys(rows || {}).length > 0) {
								//log.info(`Skipping already applied migration: ${migrationName}`);
								return; // Skip this migration
							}

							// Read and execute the migration SQL
							const migrationPath = path.join(migrationDir, file);
							const sql = fs.readFileSync(migrationPath, 'utf8');
							return connection.query(sql).then(() => {
								// Record the applied migration
								return connection.query(
									'INSERT INTO migrations (name) VALUES (?)',
									[migrationName]
								).then(() => {
									log.info(`Applied migration: ${migrationName}`);
								});
							});
						});
					});
				}, Promise.resolve());
			})
			.then(() => {
				log.info('All migrations applied successfully!');
				resolve();
			})
			.catch(err => {
				log.error('Error running migrations:', err);
				reject(err);
			})
			.finally(() => {
				if (connection) connection.release();
			});
	});
}


module.exports = runMigrations