const gulp = require('gulp');
const yargs = require('yargs');
const plumber = require('gulp-plumber');
const sass = require('gulp-sass');
const postcss = require('gulp-postcss');
const autoprefixer = require('autoprefixer');
const cssnano = require('cssnano');
const svgmin = require('gulp-svgmin');
const rename = require('gulp-rename');
const babel = require('gulp-babel');
const minify = require('gulp-babel-minify');
const ftp = require('vinyl-ftp');
const browserSync = require('browser-sync');
const childProcess = require('child_process');

const deploy = Boolean(yargs.argv.production);

gulp.task('jekyll', (done) => {
  if (deploy) {
    const production = process.env;
    production.JEKYLL_ENV = 'production';

    return childProcess.spawn('jekyll', ['build'], { stdio: 'inherit', env: production })
      .on('close', done);
  }

  return childProcess.spawn('jekyll', ['build'], { stdio: 'inherit' })
    .on('close', done);
});

gulp.task('rebuild', ['jekyll'], () => {
  browserSync.reload();
});

gulp.task('browser-sync', ['jekyll'], () => {
  browserSync({
    server: {
      baseDir: '_site',
    },
  });
});

gulp.task('styles', () => {
  gulp.src('src/sass/main.scss')
    .pipe(plumber())
    .pipe(sass())
    .pipe(postcss([autoprefixer(), cssnano()]))
    .pipe(gulp.dest('_site/assets/css/'))
    .pipe(browserSync.reload({ stream: true }))
    .pipe(gulp.dest('assets/css/'));
});

gulp.task('scripts', () => {
  gulp.src('src/js/*.js')
    .pipe(plumber())
    .pipe(babel())
    .pipe(minify())
    .pipe(gulp.dest('_site/assets/js/'))
    .pipe(browserSync.reload({ stream: true }))
    .pipe(gulp.dest('assets/js/'));
});

gulp.task('images', () => {
  gulp.src('src/img/**/*')
    .pipe(gulp.dest('_site/assets/img/'))
    .pipe(browserSync.reload({ stream: true }))
    .pipe(gulp.dest('assets/img/'));
});

gulp.task('vectors', () => {
  gulp.src('src/svg/**/*')
    .pipe(plumber())
    .pipe(svgmin())
    .pipe(rename({
      extname: '.html',
    }))
    .pipe(gulp.dest('_includes/'))
    .pipe(browserSync.reload({ stream: true }));
});

gulp.task('watch', () => {
  gulp.watch('src/sass/**/*', ['styles', 'rebuild']);
  gulp.watch('src/js/*.js', ['scripts', 'rebuild']);
  gulp.watch(['**/*.html', '_includes/*.html', '_layouts/*.html'], ['rebuild']);
});

gulp.task('deploy', () => {
  const conn = ftp.create({
    host: '',
    user: '',
    pass: '',
    parallel: 10,
  });

  return gulp.src('_site/**', { base: '_site/', buffer: false })
    .pipe(conn.newer('/public_html'))
    .pipe(conn.dest('/public_html'));
});

gulp.task('dev', ['images', 'vectors', 'styles', 'scripts', 'browser-sync', 'watch']);

gulp.task('build', ['images', 'vectors', 'styles', 'scripts', 'jekyll']);