// requirements
const progress = require('progress');
const readline = require('readline');

// print logo
function printLogo() {
    console.log('  _             _               _   __  __ ');
    console.log(' | |__  __ _ __| |__ _ ___ _ _ /_\\ |  \\/  |');
    console.log(' | \'_ \\\/ _` \/ _` \/ _` / -_) \'_\/ _ \\| |\\/| |');
    console.log(' |_.__\/\\__,_\\__,_\\__, \\___|_|\/_\/ \\_\\_|  |_|');
    console.log('                 |___/                     ');
}

// display a confirmation prompt
function askForConfirmation(message, confirms, callback) {
    const line = readline.createInterface({
        input: process.stdin,
        output: process.stdout
    });
    message += ' [';
    for (let counter = 0, length = confirms.length; counter < length; counter++) {
        if (counter > 0) {
            message += '/' + confirms[counter];
        } else {
            message += confirms[counter];
        }
    }
    message += ']';
    line.question(message + '\n', function (answer) {
        line.close();
        if (confirms.indexOf(answer) === -1) {
            return callback('wrong input: \'' + answer + '\'');
        }
        callback();
    });
}

// create a ascii progressbar
function createProgressBar(total) {
    return new progress(':bar | progress: :current/:total (:percent) | elapsed: :elapseds | eta: :etas', {
        total: total,
        width: 32
    });
}

// shutdown
function exit(err, start) {
    if (err) {
        console.error(err);
        process.exit(1);
    }
    const diff = process.hrtime(start);
    console.log('exiting after ' + ((diff[0] + (diff[1] / 1000000)) / 1000).toFixed(2) + ' seconds');
    process.exit(0);
}

// api
exports.printLogo = printLogo;
exports.askForConfirmation = askForConfirmation;
exports.createProgressBar = createProgressBar;
exports.exit = exit;