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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

/**
 * @fileoverview Defines the {@linkplain Driver WebDriver} client for Firefox.
 * Each FirefoxDriver instance will be created with an anonymous profile,
 * ensuring browser historys do not share session data (cookies, history, cache,
 * offline storage, etc.)
 *
 * __Customizing the Firefox Profile__
 *
 * The {@link Profile} class may be used to configure the browser profile used
 * with WebDriver, with functions to install additional
 * {@linkplain Profile#addExtension extensions}, configure browser
 * {@linkplain Profile#setPreference preferences}, and more. For example, you
 * may wish to include Firebug:
 *
 *     var firefox = require('selenium-webdriver/firefox');
 *
 *     var profile = new firefox.Profile();
 *     profile.addExtension('/path/to/firebug.xpi');
 *     profile.setPreference('extensions.firebug.showChromeErrors', true);
 *
 *     var options = new firefox.Options().setProfile(profile);
 *     var driver = new firefox.Driver(options);
 *
 * The {@link Profile} class may also be used to configure WebDriver based on a
 * pre-existing browser profile:
 *
 *     var profile = new firefox.Profile(
 *         '/usr/local/home/bob/.mozilla/firefox/3fgog75h.testing');
 *     var options = new firefox.Options().setProfile(profile);
 *     var driver = new firefox.Driver(options);
 *
 * The FirefoxDriver will _never_ modify a pre-existing profile; instead it will
 * create a copy for it to modify. By extension, there are certain browser
 * preferences that are required for WebDriver to function properly and they
 * will always be overwritten.
 *
 * __Using a Custom Firefox Binary__
 *
 * On Windows and OSX, the FirefoxDriver will search for Firefox in its
 * default installation location:
 *
 * * Windows: C:\Program Files and C:\Program Files (x86).
 * * Mac OS X: /Applications/Firefox.app
 *
 * For Linux, Firefox will be located on the PATH: `$(where firefox)`.
 *
 * You can configure WebDriver to start use a custom Firefox installation with
 * the {@link Binary} class:
 *
 *     var firefox = require('selenium-webdriver/firefox');
 *     var binary = new firefox.Binary('/my/firefox/install/dir/firefox-bin');
 *     var options = new firefox.Options().setBinary(binary);
 *     var driver = new firefox.Driver(options);
 *
 * __Remote Testing__
 *
 * You may customize the Firefox binary and profile when running against a
 * remote Selenium server. Your custom profile will be packaged as a zip and
 * transfered to the remote host for use. The profile will be transferred
 * _once for each new session_. The performance impact should be minimal if
 * you've only configured a few extra browser preferences. If you have a large
 * profile with several extensions, you should consider installing it on the
 * remote host and defining its path via the {@link Options} class. Custom
 * binaries are never copied to remote machines and must be referenced by
 * installation path.
 *
 *     var options = new firefox.Options()
 *         .setProfile('/profile/path/on/remote/host')
 *         .setBinary('/install/dir/on/remote/host/firefox-bin');
 *
 *     var driver = new (require('selenium-webdriver')).Builder()
 *         .forBrowser('firefox')
 *         .usingServer('http://127.0.0.1:4444/wd/hub')
 *         .setFirefoxOptions(options)
 *         .build();
 */

'use strict';

const url = require('url');

const Binary = require('./binary').Binary,
    Profile = require('./profile').Profile,
    decodeProfile = require('./profile').decode,
    executors = require('../executors'),
    httpUtil = require('../http/util'),
    io = require('../io'),
    capabilities = require('../lib/capabilities'),
    logging = require('../lib/logging'),
    promise = require('../lib/promise'),
    webdriver = require('../lib/webdriver'),
    net = require('../net'),
    portprober = require('../net/portprober'),
    remote = require('../remote');


/**
 * Firefox-specific capability keys. Users should use the {@linkplain Options}
 * class instead of referencing these keys directly. _These keys are considered
 * implementation details and may be removed or changed at any time._
 *
 * @enum {string}
 */
const Capability = {
  /**
   * Defines the Firefox binary to use. May be set to either a
   * {@linkplain Binary} instance, or a string path to the Firefox executable.
   */
  BINARY: 'firefox_binary',

  /**
   * Specifies whether to use Mozilla's Marionette, or the legacy FirefoxDriver
   * from the Selenium project. Defaults to false.
   */
  MARIONETTE: 'marionette',

  /**
   * Defines the Firefox profile to use. May be set to either a
   * {@linkplain Profile} instance, or to a base-64 encoded zip of a profile
   * directory.
   */
  PROFILE: 'firefox_profile'
};


/**
 * Configuration options for the FirefoxDriver.
 */
class Options {
  constructor() {
    /** @private {Profile} */
    this.profile_ = null;

    /** @private {Binary} */
    this.binary_ = null;

    /** @private {logging.Preferences} */
    this.logPrefs_ = null;

    /** @private {?capabilities.ProxyConfig} */
    this.proxy_ = null;

    /** @private {boolean} */
    this.marionette_ = false;
  }

  /**
   * Sets the profile to use. The profile may be specified as a
   * {@link Profile} object or as the path to an existing Firefox profile to use
   * as a template.
   *
   * @param {(string|!Profile)} profile The profile to use.
   * @return {!Options} A self reference.
   */
  setProfile(profile) {
    if (typeof profile === 'string') {
      profile = new Profile(profile);
    }
    this.profile_ = profile;
    return this;
  }

  /**
   * Sets the binary to use. The binary may be specified as the path to a Firefox
   * executable, or as a {@link Binary} object.
   *
   * @param {(string|!Binary)} binary The binary to use.
   * @return {!Options} A self reference.
   */
  setBinary(binary) {
    if (typeof binary === 'string') {
      binary = new Binary(binary);
    }
    this.binary_ = binary;
    return this;
  }

  /**
   * Sets the logging preferences for the new session.
   * @param {logging.Preferences} prefs The logging preferences.
   * @return {!Options} A self reference.
   */
  setLoggingPreferences(prefs) {
    this.logPrefs_ = prefs;
    return this;
  }

  /**
   * Sets the proxy to use.
   *
   * @param {capabilities.ProxyConfig} proxy The proxy configuration to use.
   * @return {!Options} A self reference.
   */
  setProxy(proxy) {
    this.proxy_ = proxy;
    return this;
  }

  /**
   * Sets whether to use Mozilla's Marionette to drive the browser.
   *
   * @see https://developer.mozilla.org/en-US/docs/Mozilla/QA/Marionette/WebDriver
   */
  useMarionette(marionette) {
    this.marionette_ = marionette;
    return this;
  }

  /**
   * Converts these options to a {@link capabilities.Capabilities} instance.
   *
   * @return {!capabilities.Capabilities} A new capabilities object.
   */
  toCapabilities() {
    var caps = capabilities.Capabilities.firefox();
    if (this.logPrefs_) {
      caps.set(capabilities.Capability.LOGGING_PREFS, this.logPrefs_);
    }
    if (this.proxy_) {
      caps.set(capabilities.Capability.PROXY, this.proxy_);
    }
    if (this.binary_) {
      caps.set(Capability.BINARY, this.binary_);
    }
    if (this.profile_) {
      caps.set(Capability.PROFILE, this.profile_);
    }
    caps.set(Capability.MARIONETTE, this.marionette_);
    return caps;
  }
}


const WIRES_EXE = process.platform === 'win32' ? 'wires.exe' : 'wires';


/**
 * @return {string} .
 * @throws {Error}
 */
function findWires() {
  let exe = io.findInPath(WIRES_EXE, true);
  if (!exe) {
    throw Error(
      'The ' + WIRES_EXE + ' executable could not be found on the current ' +
      'PATH. Please download the latest version from ' +
      'https://developer.mozilla.org/en-US/docs/Mozilla/QA/Marionette/' +
      'WebDriver and ensure it can be found on your PATH.');
  }
  return exe;
}


/**
 * @param {(string|!Binary)} binary .
 * @return {!remote.DriverService} .
 */
function createWiresService(binary) {
    // Firefox's Developer Edition is currently required for Marionette.
  let exe;
  if (typeof binary === 'string') {
    exe = Promise.resolve(binary);
  } else {
    binary.useDevEdition();
    exe = binary.locate();
  }

  let wires = findWires();
  let port =  portprober.findFreePort();
  return new remote.DriverService(wires, {
    loopback: true,
    port: port,
    args: promise.all([exe, port]).then(args => {
      return ['-b', args[0], '--webdriver-port', args[1]];
    })
    // ,stdio: 'inherit'
  });
}


/**
 * @param {(Profile|string)} profile The profile to prepare.
 * @param {number} port The port the FirefoxDriver should listen on.
 * @return {!Promise<string>} a promise for the path to the profile directory.
 */
function prepareProfile(profile, port) {
  if (typeof profile === 'string') {
    return decodeProfile(/** @type {string} */(profile)).then(dir => {
      profile = new Profile(dir);
      profile.setPreference('webdriver_firefox_port', port);
      return profile.writeToDisk();
    });
  }

  profile = profile || new Profile;
  profile.setPreference('webdriver_firefox_port', port);
  return profile.writeToDisk();
}


/**
 * A WebDriver client for Firefox.
 */
class Driver extends webdriver.WebDriver {
  /**
   * @param {(Options|capabilities.Capabilities|Object)=} opt_config The
   *    configuration options for this driver, specified as either an
   *    {@link Options} or {@link capabilities.Capabilities}, or as a raw hash
   *    object.
   * @param {promise.ControlFlow=} opt_flow The flow to
   *     schedule commands through. Defaults to the active flow object.
   */
  constructor(opt_config, opt_flow) {
    let caps;
    if (opt_config instanceof Options) {
      caps = opt_config.toCapabilities();
    } else {
      caps = new capabilities.Capabilities(opt_config);
    }

    let binary = caps.get(Capability.BINARY) || new Binary();
    caps.delete(Capability.BINARY);
    if (typeof binary === 'string') {
      binary = new Binary(binary);
    }

    let profile = new Profile;
    if (caps.has(Capability.PROFILE)) {
      profile = caps.get(Capability.PROFILE);
      caps.delete(Capability.PROFILE);
    }

    let freePort = portprober.findFreePort();
    let serverUrl, onQuit;

    if (caps.get(Capability.MARIONETTE)
        || /^1|true$/i.test(process.env['SELENIUM_MARIONETTE'])) {
      let service = createWiresService(binary);
      serverUrl = service.start();
      onQuit = () => service.kill();

    } else {
      let preparedProfile =
          freePort.then(port => prepareProfile(profile, port));
      let command = preparedProfile.then(dir => binary.launch(dir));

      serverUrl = command.then(() => freePort)
          .then(function(/** number */port) {
            let serverUrl = url.format({
              protocol: 'http',
              hostname: net.getLoopbackAddress(),
              port: port + '',
              pathname: '/hub'
            });
            let ready = httpUtil.waitForServer(serverUrl, 45 * 1000);
            return ready.then(() => serverUrl);
          });

      onQuit = function() {
        let finishCommand = command.then(command => {
          command.kill();
          return command.result();
        });
        return finishCommand.finally(() => preparedProfile.then(io.rmDir));
      };
    }

    let executor = executors.createExecutor(serverUrl);
    let driver = webdriver.WebDriver.createSession(executor, caps, opt_flow);
    super(driver.getSession(), executor, driver.controlFlow());

    let boundQuit = this.quit.bind(this);

    /** @override */
    this.quit = function() {
      return boundQuit().thenFinally(onQuit);
    };
  }

  /**
   * This function is a no-op as file detectors are not supported by this
   * implementation.
   * @override
   */
  setFileDetector() {
  }
}


// PUBLIC API


exports.Binary = Binary;
exports.Driver = Driver;
exports.Options = Options;
exports.Profile = Profile;