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

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

// create path for target file
exports.pathFromMetadata = function pathFromMetadata(file, output, metadata, callback) {
    // define directory
    let filePath = path.normalize(output);
    if (metadata.albumartist && metadata.albumartist.length > 0) {
        let tmp;
        const artistCount = metadata.albumartist.length;
        for (let counter = 0; counter < artistCount; counter++) {
            if (counter > 0) {
                tmp += ' - ' + metadata.albumartist[counter];
            } else {
                tmp = metadata.albumartist[counter];
            }
        }
        filePath = path.join(filePath, tmp);
    } else {
        filePath = path.join(filePath, metadata.artist[0]);
    }
    if (metadata.album) {
        filePath = path.join(filePath, metadata.album);
    }
    // define filename
    let fileName = '';
    if (metadata.disk.no) {
        fileName += frontFill(metadata.disk.no, '0', 2);
    }
    if (metadata.track.no) {
        if (fileName) {
            fileName += '-' + frontFill(metadata.track.no, '0', 2) + ' ';
        } else {
            fileName += frontFill(metadata.track.no, '0', 2) + ' ';
        }
    }
    if (metadata.artist) {
        fileName += metadata.artist[0] + ' - ';
    }
    if (metadata.title) {
        fileName += metadata.title;
    }
    // append extension
    fileName += path.extname(file);
    // join directory and name
    callback(null, path.join(filePath, fileName));
};

// create target directory and move the file
exports.moveFile = function moveFile(source, target, callback) {
    async.series([
        function (asyncCallback) {
            fse.mkdirs(path.dirname(target), asyncCallback);
        },
        function (asyncCallback) {
            fse.move(source, target, asyncCallback);
        }
    ], function (err, results) {
        if (err) {
            return callback(err);
        }
        callback();
    });
}

// fill a string beginning from the front
exports.frontfill = function frontFill(string, fill, length) {
    while (string.toString().length < length) {
        string = fill + string;
    }
    return string;
};

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

// shutdown
exports.exit = 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);
};