'use strict';

const { src, dest, series, parallel } = require('gulp');
const del = require('del');
const babel = require('gulp-babel');
const terser = require('gulp-terser');
const cssnano = require('gulp-cssnano');
const htmlmin = require('gulp-htmlmin');
const imagemin = require('gulp-imagemin');
const sourcemaps = require('gulp-sourcemaps');

// Clean assets
function clean() {
    return del(['dist/']);
}

function javascript() {
    return src('src/**/*.js', {base: './src/'})
    .pipe(sourcemaps.init({loadMaps: true}))
    .pipe(babel({
        presets: ['@babel/preset-env']
    }))
    .pipe(terser({
        keep_fnames: true,
        mangle: false
    }))
    .pipe(sourcemaps.write('.'))
    .pipe(dest('dist/'));
}

function css() {
    return src('src/**/*.css', {base: './src/'})
    .pipe(sourcemaps.init({loadMaps: true}))
    .pipe(cssnano())
    .pipe(sourcemaps.write('.'))
    .pipe(dest('dist/'));
}

function html() {
    return src('src/**/*.html', {base: './src/'})
    .pipe(htmlmin({ collapseWhitespace: true }))
    .pipe(dest('dist/'));
}

function images() {
    return src(['src/**/*.png', 'src/**/*.jpg', 'src/**/*.gif', 'src/**/*.svg'], {base: './src/'})
    .pipe(imagemin())
    .pipe(dest('dist/'))
}

function copy() {
    return src(['src/**/*.json', 'src/**/*.ico'], {base: './src/'})
    .pipe(dest('dist/'))
}

exports.default = series(clean, parallel(javascript, css, html, images, copy))