const mongoose = require('mongoose');

let db;

const mongoOptions = {
    useNewUrlParser: true,
    useUnifiedTopology: true,
};

const connectToServer = (callback) => {
    if (db) {
        console.warn('Already connected to the database');
        return callback();
    }

    const connectionUrl = process.env.MONGODB_PASSWORD
        ? `mongodb://${process.env.MONGODB_USERNAME}:${process.env.MONGODB_PASSWORD}@${process.env.MONGODB_HOST}:${process.env.MONGODB_PORT}/${process.env.MONGODB_NAME}?authMechanism=DEFAULT&authSource=admin`
        : `mongodb://${process.env.HOST}/${process.env.DB_NAME}`;

    const message = process.env.MONGODB_PASSWORD
        ? 'Mongodb connected with password'
        : 'Mongodb connected without password'

    mongoose.connect(connectionUrl, mongoOptions, (err) => {
        if (err) {
            console.error('Error connecting to MongoDB:', err);
        } else {
            console.log(message);
            db = mongoose.connection;
        }
        return callback(err);
    });
};

const disconnectFromServer = () => {
    if (db) {
        mongoose.disconnect();
        console.log('Disconnected from MongoDB');
    } else {
        console.warn('Not connected to the database');
    }
};

module.exports = {
    connectToServer,
    disconnectFromServer,
};