const gulp = require('gulp');
const imagemin = require('gulp-imagemin');
const uglify = require('gulp-uglify');
const uglifycss = require('gulp-uglifycss');
const sass = require('gulp-sass');
const concat = require('gulp-concat');

/*
 * Toplevelfunction
 * gulp.task
 * gulp.src
 * gulp.dest
 * gulp.watch
 */

// Logs Message
gulp.task('message', async function () {
    return console.log('Gulp is running...');
});

// Copy All HTML files
gulp.task('copyHtml', async function () {
    gulp.src('app/*.html')
        .pipe(gulp.dest('dist'));
});

// Optimize Images
gulp.task('imageMin', async function () {
    gulp.src('app/img/*')
        .pipe(imagemin())
        .pipe(gulp.dest('dist/images'))
});

// Minify JS
gulp.task('minify', async function () {
    gulp.src('app/scripts/*.js')
        .pipe(uglify())
        .pipe(gulp.dest('dist/js'));
});

// Compile Sass
gulp.task('sass', async function () {
    gulp.src('app/sass/*.scss')
        .pipe(sass().on('error', sass.logError))
        .pipe(gulp.dest('app/css'));
});

// Minify CSS
gulp.task('css', async function () {
    gulp.src('app/css/*.css')
        .pipe(uglifycss({
            "maxLineLen": 80,
            "uglyComments": true
        }))
        .pipe(gulp.dest('./dist/css'));
});

// Scripts
gulp.task('scripts', async function () {
    gulp.src('app/scripts/*.js')
        .pipe(concat('landung.js'))
        .pipe(uglify())
        .pipe(gulp.dest('dist/js'));
});

gulp.task('run', function(done) { // <--- Insert `done` as a parameter here...
    gulp.series('message','sass', 'css', 'copyHtml', 'imageMin', 'scripts')
    done(); // <--- ...and call it here.
})
/*
gulp.task('default', ['message', 'copyHtml', 'imageMin', 'sass', 'scripts']);
*/
gulp.task('watch', async function () {
    gulp.watch('app/scripts/*.js', gulp.series('scripts'));
    gulp.watch('app/img/*', gulp.series('imageMin'));
    gulp.watch('app/sass/*.scss', gulp.series('sass'));
    gulp.watch('app/css/*.css', gulp.series('css'));
    gulp.watch('app/*.html', gulp.series('copyHtml'));
});