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var gulp = require('gulp');
var $ = require('gulp-load-plugins')();
var del = require('del');
var browserSync = require('browser-sync');


// VARIABLES ======================================================
var isDist = $.util.env.type === 'dist';
var outputFolder = isDist ? 'dist' : 'build';

var globs = {
  sass: 'src/style/**/*.scss',
  templates: 'src/templates/**/*.html',
  assets: 'src/assets/**/*.*',
  app: 'src/app/**/*.ts',
  integration: 'src/tests/integration/**/*.js',
  index: 'src/index.html'
};

var destinations = {
  css: outputFolder + "/style",
  js: outputFolder + "/src",
  libs: outputFolder + "/vendor",
  assets: outputFolder + "/assets",
  index: outputFolder
};

// TASKS ===========================================================

gulp.task('sass', function () {
  return gulp.src(globs.sass)
    .pipe($.sass({style: 'compressed'}).on('error', $.sass.logError))
    .pipe($.autoprefixer())  // defauls to > 1%, last 2 versions, Firefox ESR, Opera 12.1
    .pipe(gulp.dest(destinations.css))
    .pipe(browserSync.reload({stream: true}));
});

gulp.task('clean', function (cb) {
  del(['dist/', 'build/'], cb);
});

gulp.task('browser-sync', function () {
  return browserSync({
    open: false,
    server: {
      baseDir: "./build"
    },
    watchOptions: {
      debounceDelay: 1000
    }
  });
});

gulp.task('copy-vendor', function () {
  return gulp.src(isDist ? vendoredLibsMin : vendoredLibs)
    .pipe(gulp.dest(destinations.libs));
});

gulp.task('copy-assets', function () {
  return gulp.src(globs.assets)
    .pipe(gulp.dest(destinations.assets));
});

gulp.task('watch', function() {
  gulp.watch(globs.sass, gulp.series('sass'));
  gulp.watch(globs.appWithDefinitions, gulp.series('ts-lint', 'ts-compile'));
  gulp.watch(globs.templates, gulp.series('templates'));
  gulp.watch(globs.index, gulp.series('index'));
  gulp.watch(globs.assets, gulp.series('copy-assets'));
});

gulp.task(
  'build',
  gulp.series(
    'clean',
    gulp.parallel('sass', 'copy-assets', 'ts-compile', 'templates', 'copy-vendor'),
    'index'
  )
);

gulp.task(
  'default',
  gulp.series('build', gulp.parallel('browser-sync', 'watch', 'karma-watch'))
);