#!/usr/bin/env node

// requirements
const os = require('os');
const path = require('path');
const async = require('async');
const commander = require('commander');
const app = require('./package.json');
const audio = require('./lib/audio');
const util = require('./lib/util');
const cli = require('./lib/cli');

badger();

// main application
function badger() {
    cli.printLogo();
    // general options
    commander
        .version(app.version)
        .usage('[options] <command>')
        .option('-c, --concurrency <n>', 'specify concurrency level', os.cpus().length)
        .option('-n, --no-confirm', 'disable confirmation messages');
    // conversion
    commander
        .command('convert <input> <output>')
        .description('convert .flac to .mp3 files')
        .option('-b, --bitrate <n>', 'specify conversion bitrate', 320)
        .action(convert);
    // sort
    commander
        .command('sort <input> <output>')
        .description('sort audio files by tags')
        .option('-f, --format <format>', 'specify audio format (\'flac\', \'mp3\')', '.flac')
        .action(sort);
    // artwork
    commander
        .command('extract <input>')
        .description('extract cover artwork')
        .option('-f, --format <format>', 'specify audio format (\'flac\', \'mp3\')', '.flac')
        .action(extract);
    // scan
    commander
        .command('scan <input>')
        .description('scan audio files for missing cover artwork')
        .option('-f, --format <format>', 'specify audio format (\'flac\', \'mp3\')', '.flac')
        .action(scan);
    // parse command line arguments
    commander.parse(process.argv);
}

// convert files
function convert(input, output, options) {
    audio.batchConvert({
        input: path.normalize(input),
        output: path.normalize(output),
        concurrency: commander.concurrency || os.cpus().length,
        confirm: commander.confirm || false,
        bitrate: options.bitrate || 320,
        format: options.format || '.flac'
    }, function (err, time) {
        cli.exit(err, time);
    });
}

// sort files
function sort(input, output, options) {
    util.batchSort({
        input: path.normalize(input),
        output: path.normalize(output),
        concurrency: commander.concurrency || os.cpus().length,
        confirm: commander.confirm || false,
        format: options.format || '.flac'
    }, function (err, skipped, time) {
        if (!skipped || skipped.length === 0) {
            cli.exit(err, time);
        } else {
            console.log(skipped.length + ' files were skipped after ' + util.getTimeDiff(time) + ' seconds');
            cli.askForConfirmation('list files now?', ['yes', 'y'], function (canceled) {
                if (canceled) {
                    cli.exit(err, time);
                }
                skipped.forEach(function (file) {
                    console.log(file);
                });
                cli.exit(err);
            });
        }
    });
}

// extract artwork
function extract(input, options) {
    audio.batchArtwork({
        input: path.normalize(input),
        concurrency: commander.concurrency || os.cpus().length,
        format: options.format || '.flac'
    }, function (err, time) {
        cli.exit(err, time);
    });
}

// scan files
function scan(input, options) {
    audio.batchScan({
        input: path.normalize(input),
        concurrency: commander.concurrency || os.cpus().length,
        confirm: commander.confirm || false,
        format: options.format || '.flac'
    }, function (err, missing, time) {
        if (!missing || missing.length === 0) {
            console.log('no files with missing cover artwork found');
            cli.exit(err, time);
        } else {
            console.log(missing.length + ' files with missing cover artwork found after ' + util.getTimeDiff(time) + ' seconds');
            cli.askForConfirmation('list files now?', ['yes', 'y'], function (canceled) {
                if (canceled) {
                    cli.exit(err, time);
                }
                missing.forEach(function (file) {
                    console.log(file);
                });
                cli.exit(err);
            });
        }
    });
}