/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

const lazy = {};

ChromeUtils.defineESModuleGetters(lazy, {
  accessibility:
    "chrome://remote/content/shared/webdriver/Accessibility.sys.mjs",
  allowAllCerts: "chrome://remote/content/marionette/cert.sys.mjs",
  Capabilities: "chrome://remote/content/shared/webdriver/Capabilities.sys.mjs",
  error: "chrome://remote/content/shared/webdriver/Errors.sys.mjs",
  generateUUID: "chrome://remote/content/shared/UUID.sys.mjs",
  Log: "chrome://remote/content/shared/Log.sys.mjs",
  registerProcessDataActor:
    "chrome://remote/content/shared/webdriver/process-actors/WebDriverProcessDataParent.sys.mjs",
  RootMessageHandler:
    "chrome://remote/content/shared/messagehandler/RootMessageHandler.sys.mjs",
  RootMessageHandlerRegistry:
    "chrome://remote/content/shared/messagehandler/RootMessageHandlerRegistry.sys.mjs",
  TabManager: "chrome://remote/content/shared/TabManager.sys.mjs",
  unregisterProcessDataActor:
    "chrome://remote/content/shared/webdriver/process-actors/WebDriverProcessDataParent.sys.mjs",
  WebDriverBiDiConnection:
    "chrome://remote/content/webdriver-bidi/WebDriverBiDiConnection.sys.mjs",
  WebSocketHandshake:
    "chrome://remote/content/server/WebSocketHandshake.sys.mjs",
});

ChromeUtils.defineLazyGetter(lazy, "logger", () => lazy.Log.get());

// Global singleton that holds active WebDriver sessions
const webDriverSessions = new Map();

/**
 * @typedef {Set} SessionConfigurationFlags
 *     A set of flags defining the features of a WebDriver session. It can be
 *     empty or contain entries as listed below. External specifications may
 *     define additional flags, or create sessions without the HTTP flag.
 *
 *     <dl>
 *       <dt><code>"bidi"</code> (string)
 *       <dd>Flag indicating a WebDriver BiDi session.
 *       <dt><code>"http"</code> (string)
 *       <dd>Flag indicating a WebDriver classic (HTTP) session.
 *     </dl>
 */

/**
 * Representation of WebDriver session.
 */
export class WebDriverSession {
  #bidi;
  #capabilities;
  #connections;
  #http;
  #id;
  #messageHandler;
  #path;

  static SESSION_FLAG_BIDI = "bidi";
  static SESSION_FLAG_HTTP = "http";

  /**
   * Construct a new WebDriver session.
   *
   * It is expected that the caller performs the necessary checks on
   * the requested capabilities to be WebDriver conforming.  The WebDriver
   * service offered by Marionette does not match or negotiate capabilities
   * beyond type- and bounds checks.
   *
   * <h3>Capabilities</h3>
   *
   * <dl>
   *  <dt><code>acceptInsecureCerts</code> (boolean)
   *  <dd>Indicates whether untrusted and self-signed TLS certificates
   *   are implicitly trusted on navigation for the duration of the session.
   *
   *  <dt><code>pageLoadStrategy</code> (string)
   *  <dd>(HTTP only) The page load strategy to use for the current session.  Must be
   *   one of "<tt>none</tt>", "<tt>eager</tt>", and "<tt>normal</tt>".
   *
   *  <dt><code>proxy</code> (Proxy object)
   *  <dd>Defines the proxy configuration.
   *
   *  <dt><code>setWindowRect</code> (boolean)
   *  <dd>(HTTP only) Indicates whether the remote end supports all of the resizing
   *   and repositioning commands.
   *
   *  <dt><code>strictFileInteractability</code> (boolean)
   *  <dd>(HTTP only) Defines the current session’s strict file interactability.
   *
   *  <dt><code>timeouts</code> (Timeouts object)
   *  <dd>(HTTP only) Describes the timeouts imposed on certain session operations.
   *
   *  <dt><code>unhandledPromptBehavior</code> (string)
   *  <dd>Describes the current session’s user prompt handler.  Must be one of
   *   "<tt>accept</tt>", "<tt>accept and notify</tt>", "<tt>dismiss</tt>",
   *   "<tt>dismiss and notify</tt>", and "<tt>ignore</tt>".  Defaults to the
   *   "<tt>dismiss and notify</tt>" state.
   *
   *  <dt><code>moz:accessibilityChecks</code> (boolean)
   *  <dd>(HTTP only) Run a11y checks when clicking elements.
   *
   *  <dt><code>moz:debuggerAddress</code> (boolean)
   *  <dd>Indicate that the Chrome DevTools Protocol (CDP) has to be enabled.
   *
   *  <dt><code>moz:webdriverClick</code> (boolean)
   *  <dd>(HTTP only) Use a WebDriver conforming <i>WebDriver::ElementClick</i>.
   * </dl>
   *
   * <h4>WebAuthn</h4>
   *
   * <dl>
   *  <dt><code>webauthn:virtualAuthenticators</code> (boolean)
   *  <dd>Indicates whether the endpoint node supports all Virtual
   *   Authenticators commands.
   *
   *  <dt><code>webauthn:extension:uvm</code> (boolean)
   *  <dd>Indicates whether the endpoint node WebAuthn WebDriver
   *   implementation supports the User Verification Method extension.
   *
   *  <dt><code>webauthn:extension:prf</code> (boolean)
   *  <dd>Indicates whether the endpoint node WebAuthn WebDriver
   *   implementation supports the prf extension.
   *
   *  <dt><code>webauthn:extension:largeBlob</code> (boolean)
   *  <dd>Indicates whether the endpoint node WebAuthn WebDriver implementation
   *   supports the largeBlob extension.
   *
   *  <dt><code>webauthn:extension:credBlob</code> (boolean)
   *  <dd>Indicates whether the endpoint node WebAuthn WebDriver implementation
   *   supports the credBlob extension.
   * </dl>
   *
   * <h4>Timeouts object</h4>
   *
   * <dl>
   *  <dt><code>script</code> (number)
   *  <dd>Determines when to interrupt a script that is being evaluates.
   *
   *  <dt><code>pageLoad</code> (number)
   *  <dd>Provides the timeout limit used to interrupt navigation of the
   *   browsing context.
   *
   *  <dt><code>implicit</code> (number)
   *  <dd>Gives the timeout of when to abort when locating an element.
   * </dl>
   *
   * <h4>Proxy object</h4>
   *
   * <dl>
   *  <dt><code>proxyType</code> (string)
   *  <dd>Indicates the type of proxy configuration.  Must be one
   *   of "<tt>pac</tt>", "<tt>direct</tt>", "<tt>autodetect</tt>",
   *   "<tt>system</tt>", or "<tt>manual</tt>".
   *
   *  <dt><code>proxyAutoconfigUrl</code> (string)
   *  <dd>Defines the URL for a proxy auto-config file if
   *   <code>proxyType</code> is equal to "<tt>pac</tt>".
   *
   *  <dt><code>httpProxy</code> (string)
   *  <dd>Defines the proxy host for HTTP traffic when the
   *   <code>proxyType</code> is "<tt>manual</tt>".
   *
   *  <dt><code>noProxy</code> (string)
   *  <dd>Lists the address for which the proxy should be bypassed when
   *   the <code>proxyType</code> is "<tt>manual</tt>".  Must be a JSON
   *   List containing any number of any of domains, IPv4 addresses, or IPv6
   *   addresses.
   *
   *  <dt><code>sslProxy</code> (string)
   *  <dd>Defines the proxy host for encrypted TLS traffic when the
   *   <code>proxyType</code> is "<tt>manual</tt>".
   *
   *  <dt><code>socksProxy</code> (string)
   *  <dd>Defines the proxy host for a SOCKS proxy traffic when the
   *   <code>proxyType</code> is "<tt>manual</tt>".
   *
   *  <dt><code>socksVersion</code> (string)
   *  <dd>Defines the SOCKS proxy version when the <code>proxyType</code> is
   *   "<tt>manual</tt>".  It must be any integer between 0 and 255
   *   inclusive.
   * </dl>
   *
   * <h3>Example</h3>
   *
   * Input:
   *
   * <pre><code>
   *     {"capabilities": {"acceptInsecureCerts": true}}
   * </code></pre>
   *
   * @param {Record<string, *>=} capabilities
   *     JSON Object containing any of the recognized capabilities listed
   *     above.
   * @param {SessionConfigurationFlags} flags
   *     Session configuration flags.
   * @param {WebDriverBiDiConnection=} connection
   *     An optional existing WebDriver BiDi connection to associate with the
   *     new session.
   *
   * @throws {SessionNotCreatedError}
   *     If, for whatever reason, a session could not be created.
   */
  constructor(capabilities, flags, connection) {
    // WebSocket connections that use this session. This also accounts for
    // possible disconnects due to network outages, which require clients
    // to reconnect.
    this.#connections = new Set();

    this.#id = lazy.generateUUID();

    // Flags for WebDriver session features
    this.#bidi = flags.has(WebDriverSession.SESSION_FLAG_BIDI);
    this.#http = flags.has(WebDriverSession.SESSION_FLAG_HTTP);

    if (this.#bidi == this.#http) {
      // Initially a WebDriver session can either be HTTP or BiDi. An upgrade of a
      // HTTP session to offer BiDi features is done after the constructor is run.
      throw new lazy.error.SessionNotCreatedError(
        `Initially the WebDriver session needs to be either HTTP or BiDi (bidi=${
          this.#bidi
        }, http=${this.#http})`
      );
    }

    // Define the HTTP path to query this session via WebDriver BiDi
    this.#path = `/session/${this.#id}`;

    try {
      this.#capabilities = lazy.Capabilities.fromJSON(capabilities, this.#bidi);
    } catch (e) {
      throw new lazy.error.SessionNotCreatedError(e);
    }

    if (this.proxy.init()) {
      lazy.logger.info(
        `Proxy settings initialized: ${JSON.stringify(this.proxy)}`
      );
    }

    if (this.acceptInsecureCerts) {
      lazy.logger.warn(
        "TLS certificate errors will be ignored for this session"
      );
      lazy.allowAllCerts.enable();
    }

    // If we are testing accessibility with marionette, start a11y service in
    // chrome first. This will ensure that we do not have any content-only
    // services hanging around.
    if (this.a11yChecks && lazy.accessibility.service) {
      lazy.logger.info("Preemptively starting accessibility service in Chrome");
    }

    // If a connection without an associated session has been specified
    // immediately register the newly created session for it.
    if (connection) {
      connection.registerSession(this);
      this.#connections.add(connection);
    }

    // Maps a Navigable (browsing context or content browser for top-level
    // browsing contexts) to a Set of nodeId's.
    this.navigableSeenNodes = new WeakMap();

    lazy.registerProcessDataActor();

    webDriverSessions.set(this.#id, this);
  }

  destroy() {
    webDriverSessions.delete(this.#id);

    lazy.unregisterProcessDataActor();

    this.navigableSeenNodes = null;

    lazy.allowAllCerts.disable();

    // Close all open connections which unregister themselves.
    this.#connections.forEach(connection => connection.close());
    if (this.#connections.size > 0) {
      lazy.logger.warn(
        `Failed to close ${this.#connections.size} WebSocket connections`
      );
    }

    // Destroy the dedicated MessageHandler instance if we created one.
    if (this.#messageHandler) {
      this.#messageHandler.off(
        "message-handler-protocol-event",
        this._onMessageHandlerProtocolEvent
      );
      this.#messageHandler.destroy();
    }
  }

  get a11yChecks() {
    return this.#capabilities.get("moz:accessibilityChecks");
  }

  get acceptInsecureCerts() {
    return this.#capabilities.get("acceptInsecureCerts");
  }

  get bidi() {
    return this.#bidi;
  }

  set bidi(value) {
    this.#bidi = value;
  }

  get capabilities() {
    return this.#capabilities;
  }

  get http() {
    return this.#http;
  }

  get id() {
    return this.#id;
  }

  get messageHandler() {
    if (!this.#messageHandler) {
      this.#messageHandler =
        lazy.RootMessageHandlerRegistry.getOrCreateMessageHandler(this.#id);
      this._onMessageHandlerProtocolEvent =
        this._onMessageHandlerProtocolEvent.bind(this);
      this.#messageHandler.on(
        "message-handler-protocol-event",
        this._onMessageHandlerProtocolEvent
      );
    }

    return this.#messageHandler;
  }

  get pageLoadStrategy() {
    return this.#capabilities.get("pageLoadStrategy");
  }

  get path() {
    return this.#path;
  }

  get proxy() {
    return this.#capabilities.get("proxy");
  }

  get strictFileInteractability() {
    return this.#capabilities.get("strictFileInteractability");
  }

  get timeouts() {
    return this.#capabilities.get("timeouts");
  }

  set timeouts(timeouts) {
    this.#capabilities.set("timeouts", timeouts);
  }

  get userPromptHandler() {
    return this.#capabilities.get("unhandledPromptBehavior");
  }

  get webSocketUrl() {
    return this.#capabilities.get("webSocketUrl");
  }

  async execute(module, command, params) {
    // XXX: At the moment, commands do not describe consistently their destination,
    // so we will need a translation step based on a specific command and its params
    // in order to extract a destination that can be understood by the MessageHandler.
    //
    // For now, an option is to send all commands to ROOT, and all BiDi MessageHandler
    // modules will therefore need to implement this translation step in the root
    // implementation of their module.
    const destination = {
      type: lazy.RootMessageHandler.type,
    };
    if (!this.messageHandler.supportsCommand(module, command, destination)) {
      throw new lazy.error.UnknownCommandError(`${module}.${command}`);
    }

    return this.messageHandler.handleCommand({
      moduleName: module,
      commandName: command,
      params,
      destination,
    });
  }

  /**
   * Remove the specified WebDriver BiDi connection.
   *
   * @param {WebDriverBiDiConnection} connection
   */
  removeConnection(connection) {
    if (this.#connections.has(connection)) {
      this.#connections.delete(connection);
    } else {
      lazy.logger.warn("Trying to remove a connection that doesn't exist.");
    }
  }

  toString() {
    return `[object ${this.constructor.name} ${this.#id}]`;
  }

  // nsIHttpRequestHandler

  /**
   * Handle new WebSocket connection requests.
   *
   * WebSocket clients will attempt to connect to this session at
   * `/session/:id`.  Hereby a WebSocket upgrade will automatically
   * be performed.
   *
   * @param {Request} request
   *     HTTP request (httpd.js)
   * @param {Response} response
   *     Response to an HTTP request (httpd.js)
   */
  async handle(request, response) {
    const webSocket = await lazy.WebSocketHandshake.upgrade(request, response);
    const conn = new lazy.WebDriverBiDiConnection(
      webSocket,
      response._connection
    );
    conn.registerSession(this);
    this.#connections.add(conn);
  }

  _onMessageHandlerProtocolEvent(eventName, messageHandlerEvent) {
    const { name, data } = messageHandlerEvent;
    this.#connections.forEach(connection => connection.sendEvent(name, data));
  }

  // XPCOM

  get QueryInterface() {
    return ChromeUtils.generateQI(["nsIHttpRequestHandler"]);
  }
}

/**
 * Get the list of seen nodes for the given browsing context unique to a
 * WebDriver session.
 *
 * @param {string} sessionId
 *     The id of the WebDriver session to use.
 * @param {BrowsingContext} browsingContext
 *     Browsing context the node is part of.
 *
 * @returns {Set}
 *     The list of seen nodes.
 */
export function getSeenNodesForBrowsingContext(sessionId, browsingContext) {
  if (!lazy.TabManager.isValidCanonicalBrowsingContext(browsingContext)) {
    // If browsingContext is not a valid Browsing Context, return an empty set.
    return new Set();
  }

  const navigable =
    lazy.TabManager.getNavigableForBrowsingContext(browsingContext);
  const session = getWebDriverSessionById(sessionId);

  if (!session.navigableSeenNodes.has(navigable)) {
    // The navigable hasn't been seen yet.
    session.navigableSeenNodes.set(navigable, new Set());
  }

  return session.navigableSeenNodes.get(navigable);
}

/**
 *
 * @param {string} sessionId
 *     The ID of the WebDriver session to retrieve.
 *
 * @returns {WebDriverSession|undefined}
 *     The WebDriver session or undefined if the id is not known.
 */
export function getWebDriverSessionById(sessionId) {
  return webDriverSessions.get(sessionId);
}
