'use strict'

const path = require('path')
const babel = require('rollup-plugin-babel')
const resolve = require('rollup-plugin-node-resolve')
const banner = require('./banner.js')

const BUNDLE = process.env.BUNDLE === 'true'
const ESM = process.env.ESM === 'true'

let fileDest = `bootstrap${ESM ? '.esm' : ''}`
const external = ['popper.js']
const plugins = [
  babel(ESM ?
    {
      // Only transpile our source code
      exclude: 'node_modules/**',
      babelrc: false,
      presets: [
        [
          '@babel/env',
          {
            loose: true,
            modules: false,
            targets: {
              browsers: [
                'Chrome >= 60',
                'Safari >= 10.1',
                'iOS >= 10.3',
                'Firefox >= 54',
                'Edge >= 15'
              ]
            }
          }
        ]
      ]
    } :
    {
    // Only transpile our source code
      exclude: 'node_modules/**',
      // Include only required helpers
      externalHelpersWhitelist: [
        'defineProperties',
        'createClass',
        'inheritsLoose',
        'defineProperty',
        'objectSpread'
      ]
    })
]
const globals = {
  'popper.js': 'Popper'
}

if (BUNDLE) {
  fileDest += '.bundle'
  // Remove last entry in external array to bundle Popper
  external.pop()
  delete globals['popper.js']
  plugins.push(resolve())
}

const rollupConfig = {
  input: path.resolve(__dirname, `../js/index.${ESM ? 'esm' : 'umd'}.js`),
  output: {
    banner,
    file: path.resolve(__dirname, `../dist/js/${fileDest}.js`),
    format: ESM ? 'esm' : 'umd',
    globals
  },
  external,
  plugins
}

if (!ESM) {
  rollupConfig.output.name = 'bootstrap'
}

module.exports = rollupConfig