/* 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/. */

import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";

const lazy = {};

ChromeUtils.defineESModuleGetters(lazy, {
  accessibility: "chrome://remote/content/marionette/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",
});

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

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

/**
 * Representation of WebDriver session.
 */
export class WebDriverSession {
  /**
   * 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>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>Indicates whether the remote end supports all of the resizing
   *   and repositioning commands.
   *
   *  <dt><code>timeouts</code> (Timeouts object)
   *  <dd>Describes the timeouts imposed on certian session operations.
   *
   *  <dt><code>strictFileInteractability</code> (boolean)
   *  <dd>Defines the current session’s strict file interactability.
   *
   *  <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>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>Use a WebDriver conforming <i>WebDriver::ElementClick</i>.
   * </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 adress 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 {Object<string, *>=} capabilities
   *     JSON Object containing any of the recognised capabilities listed
   *     above.
   *
   * @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, 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();

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

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

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

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

    // 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();
    }
  }

  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,
    });
  }

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

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

  /**
   * 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 a WebDriver session corresponding to the session id.
 * Get the list of seen nodes for the given browsing context.
 *
 * @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) {
  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);
}
