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const pkg = require('./package.json')
const path = require('path')
const glob = require('glob')
const yargs = require('yargs')
const colors = require('colors')
const through = require('through2');
const qunit = require('node-qunit-puppeteer')

const {rollup} = require('rollup')
const {terser} = require('rollup-plugin-terser')
const babel = require('@rollup/plugin-babel').default
const commonjs = require('@rollup/plugin-commonjs')
const resolve = require('@rollup/plugin-node-resolve').default
const sass = require('sass')

const gulp = require('gulp')
const tap = require('gulp-tap')
const zip = require('gulp-zip')
const header = require('gulp-header')
const eslint = require('gulp-eslint')
const minify = require('gulp-clean-css')
const connect = require('gulp-connect')
const autoprefixer = require('gulp-autoprefixer')

const root = yargs.argv.root || '.'
const port = yargs.argv.port || 8000
const host = yargs.argv.host || 'localhost'

const banner = `/*!
* reveal.js ${pkg.version}
* ${pkg.homepage}
* MIT licensed
*
* Copyright (C) 2011-2022 Hakim El Hattab, https://hakim.se
*/\n`

// Prevents warnings from opening too many test pages
process.setMaxListeners(20);

const babelConfig = {
    babelHelpers: 'bundled',
    ignore: ['node_modules'],
    compact: false,
    extensions: ['.js', '.html'],
    plugins: [
        'transform-html-import-to-string'
    ],
    presets: [[
        '@babel/preset-env',
        {
            corejs: 3,
            useBuiltIns: 'usage',
            modules: false
        }
    ]]
};

// Our ES module bundle only targets newer browsers with
// module support. Browsers are targeted explicitly instead
// of using the "esmodule: true" target since that leads to
// polyfilling older browsers and a larger bundle.
const babelConfigESM = JSON.parse( JSON.stringify( babelConfig ) );
babelConfigESM.presets[0][1].targets = { browsers: [
    'last 2 Chrome versions',
    'last 2 Safari versions',
    'last 2 iOS versions',
    'last 2 Firefox versions',
    'last 2 Edge versions',
] };

let cache = {};

// Creates a bundle with broad browser support, exposed
// as UMD
gulp.task('js-es5', () => {
    return rollup({
        cache: cache.umd,
        input: 'js/index.js',
        plugins: [
            resolve(),
            commonjs(),
            babel( babelConfig ),
            terser()