import '@babel/polyfill'
import 'source-map-support/register'

import del from 'del'
import gulp from 'gulp'
import babel from 'gulp-babel'
import sourcemaps from 'gulp-sourcemaps'
import babelify from 'babelify'
import source from 'vinyl-source-stream'
import browserify from 'browserify'
import buffer from 'vinyl-buffer'

gulp.task('cleanLib', () => {
  return del(['lib'], { force: true })
})

gulp.task('cleanDist', () => {
  return del(['dist'], { force: true })
})

gulp.task(
  'buildSrc',
  gulp.series('cleanLib', () => {
    return gulp
      .src(['src/**/*.js'])
      .pipe(sourcemaps.init())
      .pipe(babel())
      .pipe(sourcemaps.write('./'))
      .pipe(gulp.dest('lib'))
  }),
)

gulp.task(
  'buildDist',
  gulp.series('cleanDist', () => {
    const options = {
      entries: ['index.js'],
      debug: false,
      basedir: 'src',
      standalone: 'himalaya',
    }
    return browserify(options)
      .transform(babelify)
      .bundle()
      .pipe(source('himalaya.js'))
      .pipe(buffer())
      .pipe(
        sourcemaps.init({
          // loads map from browserify file
          loadMaps: true,
        }),
      )
      .pipe(sourcemaps.write('./'))
      .pipe(gulp.dest('docs/dist'))
  }),
)

gulp.task('build', gulp.series('buildSrc', 'buildDist'))
gulp.task('default', gulp.series('build'))