var fs = require('fs');
var sourceMap = require('source-map');

describe('sourcemaps', function () {
  var URL = 'examples/src/sourcemap/index.html';

  it('should map sources', function() {
    browser.get(URL);
    // TODO(tbosch): Bug in ChromeDriver: Need to execute at least one command
    // so that the browser logs can be read out!
    browser.executeScript('1+1');
    browser.manage().logs().get('browser').then(function(logs) {
      var errorLine = null;
      var errorColumn = null;
      logs.forEach(function(log) {
        var match = /Test\.run\s+\(.+:(\d+):(\d+)/m.exec(log.message);
        if (match) {
          errorLine = parseInt(match[1]);
          errorColumn = parseInt(match[2]);
        }
      });

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


      var sourceMapData = fs.readFileSync(
          'dist/js/prod/es5/examples/src/sourcemap/index.js.map');
      var decoder = new sourceMap.SourceMapConsumer(JSON.parse(sourceMapData));

      var originalPosition = decoder.originalPositionFor({
        line: errorLine,
        column: errorColumn
      });

      var finalMapData = fs.readFileSync(
          'dist/js/prod/es6/examples/src/sourcemap/index.map');
      var finalDecoder = new sourceMap.SourceMapConsumer(JSON.parse(finalMapData));

      var finalPosition = finalDecoder.originalPositionFor(originalPosition);

      var sourceCodeLines = fs.readFileSync('modules/examples/src/sourcemap/index.js',
          {encoding: 'UTF-8'}).split('\n');
      expect(sourceCodeLines[finalPosition.line - 1])
          .toMatch(/throw new BaseException\(\'Sourcemap test\'\)/);
    });
  });
});