import gulp from 'gulp';
import clean from 'gulp-clean';
import sass from 'gulp-sass';
import gulpif from 'gulp-if';
import rename from 'gulp-rename';
import autoprefixer from 'gulp-autoprefixer';
import sourcemaps from 'gulp-sourcemaps';
import { rollup } from 'rollup';
import buble from 'rollup-plugin-buble';
import nodeResolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
import json from 'rollup-plugin-json';
import replace from 'rollup-plugin-replace';
import multiEntry from 'rollup-plugin-multi-entry';
import uglify from 'rollup-plugin-uglify';
import { minify } from 'uglify-js';
import imagemin from 'gulp-imagemin';
import notify from 'gulp-notify';
import runSequence from 'run-sequence';
import path from 'path';

const { log } = console;
let production = false;
let error = false;

/**
 * Config
 */
const config = {
  src: './assets',
  public: './',
};

/**
 * Tasks - in order
 */
const tasks = ['clean', 'styles', 'scripts', 'images'];

/**
 * Notification
 *
 * @param {string} message
 * @param {string} status
 */
function notification(message = '', status = 'success') {
  return gulp.src('./node_modules/gulp-notify/test/fixtures/1.txt')
    .pipe(notify({
      title: 'Barebones',
      message,
      icon: path.join(__dirname, `assets/icons/${status}.png`),
    }));
}

/**
 * Clean
 */
gulp.task('clean', () => (
  gulp.src([`${config.public}/css`, `${config.public}/js`], {
    read: false,
  })
    .pipe(clean())
));

gulp.task('styles', () => (
  gulp.src([`${config.src}/styles/*.scss`])
    .pipe(gulpif(!production, sourcemaps.init()))
    .pipe(sass({
      outputStyle: production ? 'compressed' : 'nested',
    }).on('error', (err) => {
      notification('Failed to compile styles. 😱', 'error');
      log(err.stack);
      error = true;
    }))
    .pipe(autoprefixer({
      browsers: ['last 10 versions'],
    }))
    .pipe(rename({
      suffix: '.min',
    }))
    .pipe(gulpif(!production, sourcemaps.write('.')))
    .pipe(gulp.dest(`${config.public}/css`))
));

gulp.task('scripts', () => {
  let env = 'development';
  if (production) {
    env = 'production';
  }

  rollup({
    entry: `${config.src}/scripts/scripts.js`,
    plugins: [
      multiEntry(),
      buble(),
      nodeResolve({
        browser: true,
        main: true,
        jsnext: true,
      }),
      commonjs({
        include: [
          'node_modules/**',
          `${config.src}/**`,
        ],
      }),
      json(),
      replace({
        'process.env.NODE_ENV': JSON.stringify(env),
      }),
      production ? uglify({}, minify) : '',
    ],
  }).then((bundle) => {
    bundle.write({
      format: 'iife',
      moduleName: 'BarebonesBundle',
      sourceMap: !production,
      dest: `${config.public}/js/script.min.js`,
    });
  }).catch((err) => {
    notification('Failed to compile scripts. 😱', 'error');
    log(err.stack);
    error = true;
  });
});

/**
 * Watch
 */
gulp.task('watch-files', tasks, () => {
  gulp.watch(`${config.src}/styles/**/*.scss`, ['styles']);
  gulp.watch(`${config.src}/scripts/**/*.js`, ['scripts']);
  gulp.watch(`${config.src}/images/**/*.*`, ['images']);
});

/**
 * Images
 */
gulp.task('images', () => {
  // hadle all images that are not svg
  gulp.src(`${config.src}/images/**/*.*`)
    .pipe(imagemin({
      progressive: true,
      svgoPlugins: [{
        removeViewBox: false,
      }],
    }))
    .pipe(gulp.dest(`${config.public}/img`));
});

/**
 * Main Tasks
 */
gulp.task('watch', () => (
  runSequence(tasks, 'watch-files', () => {
    if (!error) {
      notification('Watching files... 👀');
    }
  })
));

gulp.task('build', () => {
  production = true;
  runSequence(tasks, () => {
    if (!error) {
      notification('Build complete! 🍻');
    }
  });
});

gulp.task('default', () => (
  runSequence(tasks)
));