/**
 * Copyright (C) 2019  The Software Heritage developers
 * See the AUTHORS file at the top-level directory of this distribution
 * License: GNU Affero General Public License version 3, or any later version
 * See top-level LICENSE file for more information
 */

'use strict';

// This plugin modifies the generated asset sourcemaps on the fly
// in order to be successfully loaded by Firefox.
// The following error is reported without that:
// Source map error: TypeError: Invalid URL: webpack://swh.[name]/...

class FixSwhSourceMapsPlugin {

  constructor() {
    this.sourceMapRegexp = /\.map($|\?)/i;
  }

  apply(compiler) {
    compiler.hooks.compilation.tap('FixSwhSourceMapsPlugin', compilation => {
      const {Compilation, sources} = require('webpack');
      compilation.hooks.processAssets.tap(
        {
          name: 'FixSwhSourceMapsPlugin',
          stage: Compilation.PROCESS_ASSETS_STAGE_ANALYSE
        },
        () => {
          Object.keys(compilation.assets).filter(key => {
            return this.sourceMapRegexp.test(key);
          }).forEach(key => {
            let bundleName = key.replace(/^js\//, '');
            bundleName = bundleName.replace(/^css\//, '');
            const pos = bundleName.indexOf('.');
            bundleName = bundleName.slice(0, pos);
            const asset = compilation.assets[key];
            const source = asset.source().replace(/swh.\[name\]/g, 'swh.' + bundleName);
            compilation.updateAsset(key, new sources.RawSource(source));
          });
        }
      );
    });
  }

};

module.exports = FixSwhSourceMapsPlugin;