/*
 * SonarQube
 * Copyright (C) 2009-2018 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

// Copied from https://github.com/facebook/create-react-app/blob/master/packages/react-dev-utils/InterpolateHtmlPlugin.js

// This Webpack plugin lets us interpolate custom variables into `index.html`.
// Usage: `new InterpolateHtmlPlugin({ 'MY_VARIABLE': 42 })`
// Then, you can use %MY_VARIABLE% in your `index.html`.

// It works in tandem with HtmlWebpackPlugin.
// Learn more about creating plugins like this:
// https://github.com/ampedandwired/html-webpack-plugin#events

'use strict';
const escapeStringRegexp = require('escape-string-regexp');

class InterpolateHtmlPlugin {
  constructor(replacements) {
    this.replacements = replacements;
  }

  apply(compiler) {
    compiler.hooks.compilation.tap('InterpolateHtmlPlugin', compilation => {
      compilation.hooks.htmlWebpackPluginBeforeHtmlProcessing.tap('InterpolateHtmlPlugin', data => {
        // Run HTML through a series of user-specified string replacements.
        Object.keys(this.replacements).forEach(key => {
          const value = this.replacements[key];
          data.html = data.html.replace(
            new RegExp('%' + escapeStringRegexp(key) + '%', 'g'),
            value
          );
        });
      });
    });
  }
}

module.exports = InterpolateHtmlPlugin;