const mysql = require("mysql2");
const { readdir } = require("fs");
const path = require("path");

/**
 * Universal database instance to be used for any database operations
 */
class DatabaseInstance {
    /**
     * Construct the DatabaseInstance using the database credentials
     * 
     * @param {Object} credentials The database credentils in a standard mysql format
     */
    constructor(credentials) {
        this.pool = mysql.createPool({
            database: credentials.database,
            user: credentials.user,
            password: credentials.password,
            host: credentials.host,
            port: credentials.port,
            enableKeepAlive: true,
            waitForConnections: true,
            connectionLimit: 10
        });

        console.log("[JET » DatabaseInstance] Successfully initialized database connection")

        this.pool.on("connection", (err) => {
            if (err) console.log("[JET » DatabaseInstance] Error occurred during connection");
            else console.log("[JET » DatabaseInstance » client] Successfully created new connection");
        });
    }

    /**
     * 
     * @param {String} query 
     * @param {Array} values 
     * @returns 
     */
    async execute(query, values, callback) {
        this.pool.execute(query, values, callback);
    }

    async query(query, callback) {
        this.pool.query(query, callback);
    }
}

module.exports = { DatabaseInstance };