const gulp = require('gulp');
const autoprefixer = require('gulp-autoprefixer');
const cssnano = require('gulp-cssnano');
const jshint = require('gulp-jshint');
const uglify = require('gulp-uglify');
const rename = require('gulp-rename');
const concat = require('gulp-concat');
const cache = require('gulp-cache');
const htmlmin = require('gulp-htmlmin');
const htmlreplace = require('gulp-html-replace');
const stripDebug = require('gulp-strip-debug');
const scss = require('gulp-scss');
const sass = require('gulp-sass');
const googleWebFonts = require('gulp-google-webfonts');
const babel = require('gulp-babel');
//
const watchify = require('watchify');
const browserify = require('browserify');
const source = require('vinyl-source-stream');
const buffer = require('vinyl-buffer');
const gutil = require('gulp-util');
const sourcemaps = require('gulp-sourcemaps');
const assign = require('lodash.assign');

const filePath = {
  'build_dir': 'live'
};

const dest = 'app/live';

const fontOptions = { };

const customOpts = {
  'entries': ['./app/appV2.js'],
  'debug': true
};
const opts = assign({}, watchify.args, customOpts);
const b = watchify(browserify(opts));

gulp.task('appJS', function() {
  return gulp.src(['app/js/websocket.js', 'app/js/slackSocket.js', 'app/js/modules/events.js', 'app/js/modules/bitcoin.js', 'app/js/modules/fx.js', 'app/js/modules/train.js', 'app/js/modules/weatherV2.js', 'app/js/modules/password.js', 'app/app.js'])
    .pipe(stripDebug())
    .pipe(jshint('.jshintrc'))
    .pipe(jshint.reporter('default'))
    .pipe(babel({ 'presets': ['es2015'] }))
    .pipe(concat('app.js'))
    .pipe(uglify({ 'mangle': true, 'compress': { 'sequences': true, // Join consecutive statemets with the “comma operator”
      'properties': true, // Optimize property access: a["foo"] → a.foo
      'dead_code': true, // Discard unreachable code
      'drop_debugger': true, // Discard “debugger” statements
      'unsafe': false, // Some unsafe optimizations (see below)
      'conditionals': true, // Optimize if-s and conditional expressions
      'comparisons': true, // Optimize comparisons
      'evaluate': true, // Evaluate constant expressions
      'booleans': true, // Optimize boolean expressions
      'loops': true, // Optimize loops
      'unused': true, // Drop unused variables/functions
      'hoist_funs': true, // Hoist function declarations
      'hoist_vars': true, // Hoist variable declarations
      'if_return': true, // Optimize if-s followed by return/continue
      'join_vars': true, // Join var declarations
      'cascade': true, // Try to cascade `right` into `left` in sequences
      'side_effects': true, // Drop side-effect-free statements
      'warnings': true, // Warn about potentially dangerous optimizations/code
      'global_defs': {} // global definitions
    } }))
    .pipe(gulp.dest(`${dest }/js`));
});

gulp.task('customMUI', function() {
  return gulp.src(['app/css/custom.scss'])
    .pipe(sass({ 'outputStyle': 'compressed' }).on('error', sass.logError))
    // .pipe(cssnano())
    .pipe(rename('mui.custom.css'))
    .pipe(gulp.dest(`${dest}/css`));
});

gulp.task('vendor', function() {
  return gulp.src([
    'bower_components/zepto/zepto.min.js',
    'bower_components/ejs/ejs.min.js',
    'bower_components/underscore/underscore-min.js',
    'bower_components/backbone/backbone-min.js',
    'bower_components/moment/min/moment.min.js'
  ])
    .pipe(concat('vendor.js'))

    /* .pipe(uglify({ 'mangle': false }))*/
    .pipe(gulp.dest(`${dest }/js`));
});

gulp.task('fonts', function() {
  return gulp.src('./fonts.list')
    .pipe(googleWebFonts(fontOptions))
    .pipe(gulp.dest(`${dest }/fonts`))
  ;
});

gulp.task('migrate', function() {
  return gulp.src(['./app/css/weather.css'])
    .pipe(gulp.dest(`${dest}/css`));
});

function bundle() {
  return b.bundle()
    // log errors if they happen
    .on('error', gutil.log.bind(gutil, 'Browserify Error'))
    .pipe(source('bundle.js'))
    // optional, remove if you don't need to buffer file contents
    .pipe(buffer())
    // optional, remove if you dont want sourcemaps
    .pipe(sourcemaps.init({ 'loadMaps': true })) // loads map from browserify file
  // Add transformation tasks to the pipeline here.
    .pipe(sourcemaps.write('./')) // writes .map file
    .pipe(gulp.dest('./app'));
}

gulp.task('default', ['appJS', 'vendor', 'customMUI', 'fonts', 'migrate']);

gulp.task('js', bundle); // so you can run `gulp js` to build the file
b.on('update', bundle); // on any dep update, runs the bundler
b.on('log', gutil.log); // output build logs to terminal