// Karma configuration
// GENERATED BY Bazel
const path = require('path');
const fs = require('fs');
const tmp = require('tmp');

const browsers = [];
let customLaunchers = null;

// WEB_TEST_METADATA is configured in rules_webtesting based on value
// of the browsers attribute passed to ts_web_test_suite
// We setup the karma configuration based on the values in this object
if (process.env['WEB_TEST_METADATA']) {
  const webTestMetadata = require(process.env['WEB_TEST_METADATA']);
  if (webTestMetadata['environment'] === 'sauce') {
    // If a sauce labs browser is chosen for the test such as
    // "@io_bazel_rules_webtesting//browsers/sauce:chrome-win10"
    // than the 'environment' will equal 'sauce'.
    // We expect that a SAUCE_USERNAME and SAUCE_ACCESS_KEY is available
    // from the environment for this test to run
    if (!process.env.SAUCE_USERNAME || !process.env.SAUCE_ACCESS_KEY) {
      console.error('Make sure the SAUCE_USERNAME and SAUCE_ACCESS_KEY environment variables are set.');
      process.exit(1);
    }
    // 'capabilities' will specify the sauce labs configuration to use
    const capabilities = webTestMetadata['capabilities'];
    customLaunchers = {
        'sauce': {
        base: 'SauceLabs',
        browserName: capabilities['browserName'],
        platform: capabilities['platform'],
        version: capabilities['version'],
      }
    };
    browsers.push('sauce');
  } else if (webTestMetadata['environment'] === 'local') {
    // When a local chrome or firefox browser is chosen such as
    // "@io_bazel_rules_webtesting//browsers:chromium-local" or
    // "@io_bazel_rules_webtesting//browsers:firefox-local"
    // then the 'environment' will equal 'local' and
    // 'webTestFiles' will contain the path to the binary to use
    const webTestNamedFiles = webTestMetadata['webTestFiles'][0]['namedFiles'];
    if (webTestNamedFiles['CHROMIUM']) {
      // When karma is configured to use Chrome it will look for a CHROME_BIN
      // environment variable.
      process.env.CHROME_BIN = require.resolve(webTestNamedFiles['CHROMIUM']);
      browsers.push(process.env['DISPLAY'] ? 'Chrome': 'ChromeHeadless');
    }
    if (webTestNamedFiles['FIREFOX']) {
      // When karma is configured to use Firefox it will look for a FIREFOX_BIN
      // environment variable.
      process.env.FIREFOX_BIN = require.resolve(webTestNamedFiles['FIREFOX']);
      browsers.push(process.env['DISPLAY'] ? 'Firefox': 'FirefoxHeadless');
    }
  } else {
    console.warn(`Unknown WEB_TEST_METADATA environment '${webTestMetadata['environment']}'`);
  }
}

// Fallback to using the system local chrome if no valid browsers have been
// configured above
if (!browsers.length) {
  console.warn('No browsers configured. Configuring Karma to use system Chrome.');
  browsers.push(process.env['DISPLAY'] ? 'Chrome': 'ChromeHeadless');
}

const proxies = {};
const files = [
  TMPL_bootstrap_files
  TMPL_user_files
].map(f => require.resolve(f));

// static files are added to the files array but
// configured to not be included so karma-concat-js does
// not included them in the bundle
  [TMPL_static_files].forEach((f) => {
    // In Windows, the runfile will probably not be symlinked. Se we need to
    // serve the real file through karma, and proxy calls to the expected file
    // location in the runfiles to the real file.
    const resolvedFile = require.resolve(f);
    files.push({pattern: resolvedFile, included: false});
    // Prefixing the proxy path with '/absolute' allows karma to load local
    // files. This doesn't see to be an official API.
    // https://github.com/karma-runner/karma/issues/2703
    proxies['/base/' + f] = '/absolute' + resolvedFile;
  });

  var requireConfigContent = `
// A simplified version of Karma's requirejs.config.tpl.js for use with Karma under Bazel.
// This does an explicit \`require\` on each test script in the files, otherwise nothing will be loaded.
(function(){
  var allFiles = [TMPL_user_files];
  var allTestFiles = [];
  allFiles.forEach(function (file) {
    if (/(spec|test)\\.js$/i.test(file) && !/\\/node_modules\\//.test(file)) {
      allTestFiles.push(file.replace(/\\.js$/, ''))
    }
  });
  require(allTestFiles, window.__karma__.start);
})();
`;

  const requireConfigFile = tmp.fileSync(
      {keep: false, postfix: '.js', dir: process.env['TEST_TMPDIR']});
  fs.writeFileSync(requireConfigFile.name, requireConfigContent);
  files.push(requireConfigFile.name);

  module.exports = function(config) {
    const configuration = {
      // list of karma plugins
      plugins: [
        'karma-*',
        'karma-concat-js',
        'karma-sourcemap-loader',
        'karma-chrome-launcher',
        'karma-firefox-launcher',
        'karma-sauce-launcher',
      ],

      // list of karma preprocessors
      preprocessors: {'**/*.js': ['sourcemap']},

      // list of test frameworks to use
      frameworks: ['jasmine', 'concat_js'],

      // test results reporter to use
      // possible values: 'dots', 'progress'
      // available reporters: https://npmjs.org/browse/keyword/karma-reporter
      reporters: ['progress'],

      // web server port
      port: 9876,

      // enable / disable colors in the output (reporters and logs)
      colors: true,

      // level of logging
      // possible values: config.LOG_DISABLE || config.LOG_ERROR ||
      // config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
      logLevel: config.LOG_INFO,

      // enable / disable watching file and executing tests whenever any file
      // changes
      autoWatch: true,

      // start these browsers
      // available browser launchers:
      // https://npmjs.org/browse/keyword/karma-launcher
      browsers: browsers,

      // Continuous Integration mode
      // if true, Karma captures browsers, runs the tests and exits
      // note: run_karma.sh may override this as a command-line option.
      singleRun: false,

      // Concurrency level
      // how many browser should be started simultaneous
      concurrency: Infinity,

      // base path that will be used to resolve all patterns (eg. files,
      // exclude)
      basePath: 'TMPL_runfiles_path',

      // list of files passed to karma; these are concatenated into a single
      // file by karma-concat-js
      files,
      proxies,
    }

    if (process.env['IBAZEL_NOTIFY_CHANGES'] === 'y') {
      // Tell karma to only listen for ibazel messages on stdin rather than
      // watch all the input files This is from fork alexeagle/karma in the
      // ibazel branch:
      // https://github.com/alexeagle/karma/blob/576d262af50b10e63485b86aee99c5358958c4dd/lib/server.js#L172
      configuration.watchMode = 'ibazel';
    }

    // Extra configuration is needed for saucelabs
    // See: https://github.com/karma-runner/karma-sauce-launcher
    if (customLaunchers) {
      // set the test name for sauce labs to use
      // TEST_BINARY is set by Bazel and contains the name of the test
      // target posfixed with the the browser name such as
      // 'examples/testing/testing_sauce_chrome-win10' for the
      // test target examples/testing:testing
      configuration.sauceLabs = {
        testName: process.env['TEST_BINARY'] || 'ts_web_test_suite'
      };

      // setup the custom launchers for saucelabs
      configuration.customLaunchers = customLaunchers;

      // add the saucelabs reporter
      configuration.reporters.push('saucelabs');
    }

    config.set(configuration);
  }