/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {readFileSync} from 'fs';
import {$, browser} from 'protractor';
import {logging} from 'selenium-webdriver';
import {RawSourceMap, SourceMapConsumer} from 'source-map';

describe('sourcemaps', function() {
  const URL = '/';

  it('should map sources', async function() {
    await browser.get(URL);

    await $('error-app .errorButton').click();

    const logs = await browser.manage().logs().get(logging.Type.BROWSER);

    let errorLine: number|null = null;
    let errorColumn: number|null = null;
    logs.forEach(function(log: any) {
      const match = log.message.match(/\.createError\s+\(.+:(\d+):(\d+)/m);
      if (match) {
        errorLine = parseInt(match[1]);
        errorColumn = parseInt(match[2]);
      }
    });

    expect(errorLine).not.toBeNull();
    expect(errorColumn).not.toBeNull();

    const content = readFileSync(require.resolve('../../src/sourcemap/index.js')).toString('utf8');
    const marker = '//# sourceMappingURL=data:application/json;base64,';
    const index = content.indexOf(marker);
    const sourceMapData =
        Buffer.from(content.substring(index + marker.length), 'base64').toString('utf8');

    const decoder = await new SourceMapConsumer(JSON.parse(sourceMapData) as RawSourceMap);
    const originalPosition = decoder.originalPositionFor({line: errorLine!, column: errorColumn!});
    const sourceCodeLines = readFileSync(require.resolve('../../src/sourcemap/index.ts'), {
                              encoding: 'utf-8'
                            }).split('\n');
    expect(sourceCodeLines[originalPosition.line! - 1])
        .toMatch(/throw new Error\(\'Sourcemap test\'\)/);
  });
});