const gulp = require('gulp')
const cleanCSS = require('gulp-clean-css')
const terser = require('gulp-terser')

const developmentPath = './assets/development'
const productionPath = './assets/production'

function minifyStyles() {
  return gulp.src(developmentPath + '/styles/*.css')
    .pipe(cleanCSS({compatibility: 'ie8'}))
    .pipe(gulp.dest(productionPath + '/styles'))
}

function minifyScripts() {
  return gulp.src(developmentPath + '/scripts/*.js')
    .pipe(terser())
    .pipe(gulp.dest(productionPath + '/scripts'))
}

function copyFavicon() {
  return gulp.src(developmentPath + '/favicon.ico')
    .pipe(gulp.dest(productionPath))
}

function copyImages() {
  return gulp.src(developmentPath + '/imgs/*')
    .pipe(gulp.dest(productionPath + '/imgs'))
}

exports.build = gulp.series(
  copyImages,
  copyFavicon,
  minifyScripts,
  minifyStyles
)