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

const lazy = {};

ChromeUtils.defineESModuleGetters(lazy, {
  AboutReaderParent: "resource:///actors/AboutReaderParent.sys.mjs",
  BrowserUsageTelemetry: "resource:///modules/BrowserUsageTelemetry.sys.mjs",
  CustomizableUI:
    "moz-src:///browser/components/customizableui/CustomizableUI.sys.mjs",
  FxAccounts: "resource://gre/modules/FxAccounts.sys.mjs",
  PanelMultiView:
    "moz-src:///browser/components/customizableui/PanelMultiView.sys.mjs",
  ProfileAge: "resource://gre/modules/ProfileAge.sys.mjs",
  ResetProfile: "resource://gre/modules/ResetProfile.sys.mjs",
  UIState: "resource://services-sync/UIState.sys.mjs",
  UpdateUtils: "resource://gre/modules/UpdateUtils.sys.mjs",
});

ChromeUtils.defineLazyGetter(lazy, "fxAccounts", () => {
  return ChromeUtils.importESModule(
    "resource://gre/modules/FxAccounts.sys.mjs"
  ).getFxAccountsSingleton();
});

// See LOG_LEVELS in Console.sys.mjs. Common examples: "All", "Info", "Warn", &
// "Error".
const PREF_LOG_LEVEL = "browser.uitour.loglevel";

const BACKGROUND_PAGE_ACTIONS_ALLOWED = new Set([
  "forceShowReaderIcon",
  "getConfiguration",
  "getTreatmentTag",
  "hideHighlight",
  "hideInfo",
  "hideMenu",
  "ping",
  "registerPageID",
  "setConfiguration",
  "setTreatmentTag",
]);
const MAX_BUTTONS = 4;

// Prefix for any target matching a search engine.
const TARGET_SEARCHENGINE_PREFIX = "searchEngine-";

// Create a new instance of the ConsoleAPI so we can control the maxLogLevel with a pref.
ChromeUtils.defineLazyGetter(lazy, "log", () => {
  let { ConsoleAPI } = ChromeUtils.importESModule(
    "resource://gre/modules/Console.sys.mjs"
  );
  let consoleOptions = {
    maxLogLevelPref: PREF_LOG_LEVEL,
    prefix: "UITour",
  };
  return new ConsoleAPI(consoleOptions);
});

export var UITour = {
  url: null,
  /* Map from browser chrome windows to a Set of <browser>s in which a tour is open (both visible and hidden) */
  tourBrowsersByWindow: new WeakMap(),
  // Menus opened by api users explictly through `Mozilla.UITour.showMenu` call
  noautohideMenus: new Set(),
  availableTargetsCache: new WeakMap(),
  clearAvailableTargetsCache() {
    this.availableTargetsCache = new WeakMap();
  },

  _annotationPanelMutationObservers: new WeakMap(),

  _initForBrowserObserverAdded: false,

  highlightEffects: ["random", "wobble", "zoom", "color", "focus-outline"],
  targets: new Map([
    [
      "accountStatus",
      {
        query: "#appMenu-fxa-label2",
        // This is a fake widgetName starting with the "appMenu-" prefix so we know
        // to automatically open the appMenu when annotating this target.
        widgetName: "appMenu-fxa-label2",
      },
    ],
    [
      "addons",
      {
        query: "#appMenu-extensions-themes-button",
      },
    ],
    [
      "appMenu",
      {
        addTargetListener: (aDocument, aCallback) => {
          let panelPopup = aDocument.defaultView.PanelUI.panel;
          panelPopup.addEventListener("popupshown", aCallback);
        },
        query: "#PanelUI-button",
        removeTargetListener: (aDocument, aCallback) => {
          let panelPopup = aDocument.defaultView.PanelUI.panel;
          panelPopup.removeEventListener("popupshown", aCallback);
        },
      },
    ],
    ["backForward", { query: "#back-button" }],
    ["bookmarks", { query: "#bookmarks-menu-button" }],
    [
      "forget",
      {
        allowAdd: true,
        query: "#panic-button",
        widgetName: "panic-button",
      },
    ],
    ["help", { query: "#appMenu-help-button2" }],
    ["home", { query: "#home-button" }],
    [
      "logins",
      {
        query: "#appMenu-passwords-button",
      },
    ],
    [
      "privateWindow",
      {
        query: "#appMenu-new-private-window-button2",
      },
    ],
    [
      "quit",
      {
        query: "#appMenu-quit-button2",
      },
    ],
    ["readerMode-urlBar", { query: "#reader-mode-button" }],
    [
      "search",
      {
        infoPanelOffsetX: 18,
        infoPanelPosition: "after_start",
        query: "#searchbar",
        widgetName: "search-container",
      },
    ],
    [
      "searchIcon",
      {
        query: aDocument => {
          let searchbar = aDocument.getElementById("searchbar");
          return searchbar.querySelector(".searchbar-search-button");
        },
        widgetName: "search-container",
      },
    ],
    [
      "selectedTabIcon",
      {
        query: aDocument => {
          let selectedtab = aDocument.defaultView.gBrowser.selectedTab;
          let element = selectedtab.iconImage;
          if (!element || !UITour.isElementVisible(element)) {
            return null;
          }
          return element;
        },
      },
    ],
    [
      "urlbar",
      {
        query: "#urlbar",
        widgetName: "urlbar-container",
      },
    ],
    [
      "pageAction-bookmark",
      {
        query: aDocument => {
          // The bookmark's urlbar page action button is pre-defined in the DOM.
          // It would be hidden if toggled off from the urlbar.
          let node = aDocument.getElementById("star-button-box");
          return node && !node.hidden ? node : null;
        },
      },
    ],
    [
      "profilesAppMenuButton",
      {
        query: "#appMenu-profiles-button",
      },
    ],
  ]),

  init() {
    lazy.log.debug("Initializing UITour");
    // Lazy getter is initialized here so it can be replicated any time
    // in a test.
    delete this.url;
    ChromeUtils.defineLazyGetter(this, "url", function () {
      return Services.urlFormatter.formatURLPref("browser.uitour.url");
    });

    // Clear the availableTargetsCache on widget changes.
    let listenerMethods = [
      "onWidgetAdded",
      "onWidgetMoved",
      "onWidgetRemoved",
      "onWidgetReset",
      "onAreaReset",
    ];
    lazy.CustomizableUI.addListener(
      listenerMethods.reduce((listener, method) => {
        listener[method] = () => this.clearAvailableTargetsCache();
        return listener;
      }, {})
    );

    Services.obs.addObserver(this, lazy.UIState.ON_UPDATE);
  },

  getNodeFromDocument(aDocument, aQuery) {
    let viewCacheTemplate = aDocument.getElementById("appMenu-viewCache");
    return (
      aDocument.querySelector(aQuery) ||
      viewCacheTemplate.content.querySelector(aQuery)
    );
  },

  onPageEvent(aEvent, aBrowser) {
    let browser = aBrowser;
    let window = browser.ownerGlobal;

    // Does the window have tabs? We need to make sure since windowless browsers do
    // not have tabs.
    if (!window.gBrowser) {
      // When using windowless browsers we don't have a valid |window|. If that's the case,
      // use the most recent window as a target for UITour functions (see Bug 1111022).
      window = Services.wm.getMostRecentWindow("navigator:browser");
    }

    lazy.log.debug("onPageEvent:", aEvent.detail);

    if (typeof aEvent.detail != "object") {
      lazy.log.warn("Malformed event - detail not an object");
      return false;
    }

    let action = aEvent.detail.action;
    if (typeof action != "string" || !action) {
      lazy.log.warn("Action not defined");
      return false;
    }

    let data = aEvent.detail.data;
    if (typeof data != "object") {
      lazy.log.warn("Malformed event - data not an object");
      return false;
    }

    if (
      (aEvent.pageVisibilityState == "hidden" ||
        aEvent.pageVisibilityState == "unloaded") &&
      !BACKGROUND_PAGE_ACTIONS_ALLOWED.has(action)
    ) {
      lazy.log.warn(
        "Ignoring disallowed action from a hidden page:",
        action,
        aEvent.pageVisibilityState
      );
      return false;
    }

    switch (action) {
      case "registerPageID": {
        break;
      }

      case "showHighlight": {
        let targetPromise = this.getTarget(window, data.target);
        targetPromise
          .then(target => {
            if (!target.node) {
              lazy.log.error(
                "UITour: Target could not be resolved: " + data.target
              );
              return;
            }
            let effect = undefined;
            if (this.highlightEffects.includes(data.effect)) {
              effect = data.effect;
            }
            this.showHighlight(window, target, effect);
          })
          .catch(lazy.log.error);
        break;
      }

      case "hideHighlight": {
        this.hideHighlight(window);
        break;
      }

      case "showInfo": {
        let targetPromise = this.getTarget(window, data.target, true);
        targetPromise
          .then(target => {
            if (!target.node) {
              lazy.log.error(
                "UITour: Target could not be resolved: " + data.target
              );
              return;
            }

            let iconURL = null;
            if (typeof data.icon == "string") {
              iconURL = this.resolveURL(browser, data.icon);
            }

            let buttons = [];
            if (Array.isArray(data.buttons) && data.buttons.length) {
              for (let buttonData of data.buttons) {
                if (
                  typeof buttonData == "object" &&
                  typeof buttonData.label == "string" &&
                  typeof buttonData.callbackID == "string"
                ) {
                  let callback = buttonData.callbackID;
                  let button = {
                    label: buttonData.label,
                    callback: () => {
                      this.sendPageCallback(browser, callback);
                    },
                  };

                  if (typeof buttonData.icon == "string") {
                    button.iconURL = this.resolveURL(browser, buttonData.icon);
                  }

                  if (typeof buttonData.style == "string") {
                    button.style = buttonData.style;
                  }

                  buttons.push(button);

                  if (buttons.length == MAX_BUTTONS) {
                    lazy.log.warn(
                      "showInfo: Reached limit of allowed number of buttons"
                    );
                    break;
                  }
                }
              }
            }

            let infoOptions = {};
            if (typeof data.closeButtonCallbackID == "string") {
              infoOptions.closeButtonCallback = () => {
                this.sendPageCallback(browser, data.closeButtonCallbackID);
              };
            }
            if (typeof data.targetCallbackID == "string") {
              infoOptions.targetCallback = details => {
                this.sendPageCallback(browser, data.targetCallbackID, details);
              };
            }

            this.showInfo(
              window,
              target,
              data.title,
              data.text,
              iconURL,
              buttons,
              infoOptions
            );
          })
          .catch(lazy.log.error);
        break;
      }

      case "hideInfo": {
        this.hideInfo(window);
        break;
      }

      case "showMenu": {
        this.noautohideMenus.add(data.name);
        this.showMenu(window, data.name, () => {
          if (typeof data.showCallbackID == "string") {
            this.sendPageCallback(browser, data.showCallbackID);
          }
        });
        break;
      }

      case "hideMenu": {
        this.noautohideMenus.delete(data.name);
        this.hideMenu(window, data.name);
        break;
      }

      case "showNewTab": {
        this.showNewTab(window, browser);
        break;
      }

      case "getConfiguration": {
        if (typeof data.configuration != "string") {
          lazy.log.warn("getConfiguration: No configuration option specified");
          return false;
        }

        this.getConfiguration(
          browser,
          window,
          data.configuration,
          data.callbackID
        );
        break;
      }

      case "setConfiguration": {
        if (typeof data.configuration != "string") {
          lazy.log.warn("setConfiguration: No configuration option specified");
          return false;
        }

        this.setConfiguration(window, data.configuration, data.value);
        break;
      }

      case "openPreferences": {
        if (typeof data.pane != "string" && typeof data.pane != "undefined") {
          lazy.log.warn("openPreferences: Invalid pane specified");
          return false;
        }
        window.openPreferences(data.pane);
        break;
      }

      case "showFirefoxAccounts": {
        Promise.resolve()
          .then(() => {
            return lazy.FxAccounts.canConnectAccount();
          })
          .then(canConnect => {
            if (!canConnect) {
              lazy.log.warn("showFirefoxAccounts: can't currently connect");
              return null;
            }
            return data.email
              ? lazy.FxAccounts.config.promiseEmailURI(
                  data.email,
                  data.entrypoint || "uitour"
                )
              : lazy.FxAccounts.config.promiseConnectAccountURI(
                  data.entrypoint || "uitour"
                );
          })
          .then(uri => {
            if (!uri) {
              return;
            }
            const url = new URL(uri);
            // Call our helper to validate extraURLParams and populate URLSearchParams
            if (!this._populateURLParams(url, data.extraURLParams)) {
              lazy.log.warn(
                "showFirefoxAccounts: invalid campaign args specified"
              );
              return;
            }
            // We want to replace the current tab.
            browser.loadURI(url.URI, {
              triggeringPrincipal:
                Services.scriptSecurityManager.createNullPrincipal({}),
            });
          });
        break;
      }

      case "showConnectAnotherDevice": {
        lazy.FxAccounts.config
          .promiseConnectDeviceURI(data.entrypoint || "uitour")
          .then(uri => {
            const url = new URL(uri);
            // Call our helper to validate extraURLParams and populate URLSearchParams
            if (!this._populateURLParams(url, data.extraURLParams)) {
              lazy.log.warn(
                "showConnectAnotherDevice: invalid campaign args specified"
              );
              return;
            }

            // We want to replace the current tab.
            browser.loadURI(url.URI, {
              triggeringPrincipal:
                Services.scriptSecurityManager.createNullPrincipal({}),
            });
          });
        break;
      }

      case "resetFirefox": {
        // Open a reset profile dialog window.
        if (lazy.ResetProfile.resetSupported()) {
          lazy.ResetProfile.openConfirmationDialog(window);
        }
        break;
      }

      case "addNavBarWidget": {
        // Add a widget to the toolbar
        let targetPromise = this.getTarget(window, data.name);
        targetPromise
          .then(target => {
            this.addNavBarWidget(target, browser, data.callbackID);
          })
          .catch(lazy.log.error);
        break;
      }

      case "setDefaultSearchEngine": {
        let enginePromise = this.selectSearchEngine(data.identifier);
        enginePromise.catch(console.error);
        break;
      }

      case "setTreatmentTag": {
        let name = data.name;
        let value = data.value;
        Services.prefs.setStringPref("browser.uitour.treatment." + name, value);
        break;
      }

      case "getTreatmentTag": {
        let name = data.name;
        let value;
        try {
          value = Services.prefs.getStringPref(
            "browser.uitour.treatment." + name
          );
        } catch (ex) {}
        this.sendPageCallback(browser, data.callbackID, { value });
        break;
      }

      case "setSearchTerm": {
        let targetPromise = this.getTarget(window, "search");
        targetPromise.then(target => {
          let searchbar = target.node;
          searchbar.value = data.term;
          searchbar.updateGoButtonVisibility();
        });
        break;
      }

      case "openSearchPanel": {
        let targetPromise = this.getTarget(window, "search");
        targetPromise
          .then(target => {
            let searchbar = target.node;

            if (searchbar.textbox.open) {
              this.sendPageCallback(browser, data.callbackID);
            } else {
              let onPopupShown = () => {
                searchbar.textbox.popup.removeEventListener(
                  "popupshown",
                  onPopupShown
                );
                this.sendPageCallback(browser, data.callbackID);
              };

              searchbar.textbox.popup.addEventListener(
                "popupshown",
                onPopupShown
              );
              searchbar.openSuggestionsPanel();
            }
          })
          .catch(console.error);
        break;
      }

      case "ping": {
        if (typeof data.callbackID == "string") {
          this.sendPageCallback(browser, data.callbackID);
        }
        break;
      }

      case "forceShowReaderIcon": {
        lazy.AboutReaderParent.forceShowReaderIcon(browser);
        break;
      }

      case "toggleReaderMode": {
        let targetPromise = this.getTarget(window, "readerMode-urlBar");
        targetPromise.then(target => {
          lazy.AboutReaderParent.toggleReaderMode({ target: target.node });
        });
        break;
      }

      case "closeTab": {
        // Find the <tabbrowser> element of the <browser> for which the event
        // was generated originally. If the browser where the UI tour is loaded
        // is windowless, just ignore the request to close the tab. The request
        // is also ignored if this is the only tab in the window.
        let tabBrowser = browser.ownerGlobal.gBrowser;
        if (tabBrowser && tabBrowser.browsers.length > 1) {
          tabBrowser.removeTab(tabBrowser.getTabForBrowser(browser));
        }
        break;
      }

      case "showProtectionReport": {
        this.showProtectionReport(window, browser);
        break;
      }
    }

    // For performance reasons, only call initForBrowser if we did something
    // that will require a teardownTourForBrowser call later.
    // getConfiguration (called from about:home) doesn't require any future
    // uninitialization.
    if (action != "getConfiguration") {
      this.initForBrowser(browser, window);
    }

    return true;
  },

  initForBrowser(aBrowser, window) {
    let gBrowser = window.gBrowser;

    if (gBrowser) {
      gBrowser.tabContainer.addEventListener("TabSelect", this);
    }

    if (!this.tourBrowsersByWindow.has(window)) {
      this.tourBrowsersByWindow.set(window, new Set());
    }
    this.tourBrowsersByWindow.get(window).add(aBrowser);

    if (!this._initForBrowserObserverAdded) {
      this._initForBrowserObserverAdded = true;
      Services.obs.addObserver(this, "message-manager-close");
    }
    window.addEventListener("SSWindowClosing", this);
  },

  handleEvent(aEvent) {
    lazy.log.debug("handleEvent: type =", aEvent.type, "event =", aEvent);
    switch (aEvent.type) {
      case "TabSelect": {
        let window = aEvent.target.ownerGlobal;

        // Teardown the browser of the tab we just switched away from.
        if (aEvent.detail && aEvent.detail.previousTab) {
          let previousTab = aEvent.detail.previousTab;
          let openTourWindows = this.tourBrowsersByWindow.get(window);
          if (openTourWindows.has(previousTab.linkedBrowser)) {
            this.teardownTourForBrowser(
              window,
              previousTab.linkedBrowser,
              false
            );
          }
        }

        break;
      }

      case "SSWindowClosing": {
        let window = aEvent.target;
        this.teardownTourForWindow(window);
        break;
      }
    }
  },

  observe(aSubject, aTopic) {
    lazy.log.debug("observe: aTopic =", aTopic);
    switch (aTopic) {
      // The browser message manager is disconnected when the <browser> is
      // destroyed and we want to teardown at that point.
      case "message-manager-close": {
        for (let window of Services.wm.getEnumerator("navigator:browser")) {
          if (window.closed) {
            continue;
          }

          let tourBrowsers = this.tourBrowsersByWindow.get(window);
          if (!tourBrowsers) {
            continue;
          }

          for (let browser of tourBrowsers) {
            let messageManager = browser.messageManager;
            if (!messageManager || aSubject == messageManager) {
              this.teardownTourForBrowser(window, browser, true);
            }
          }
        }
        break;
      }
      case lazy.UIState.ON_UPDATE: {
        let syncState = lazy.UIState.get();
        this.notify("FxA:SignedInStateChange", { status: syncState.status });
        break;
      }
    }
  },

  // Given a string that is a JSONified represenation of an object with
  // additional "flow_id", "flow_begin_time", "device_id", utm_* URL params
  // that should be appended, validate and append them to the passed URL object.
  // Returns true if the params were validated and appended, and false if the
  // request should be ignored.
  _populateURLParams(url, extraURLParams) {
    const FLOW_ID_LENGTH = 64;
    const FLOW_BEGIN_TIME_LENGTH = 13;

    // We are extra paranoid about what params we allow to be appended.
    if (typeof extraURLParams == "undefined") {
      // no params, so it's all good.
      return true;
    }
    if (typeof extraURLParams != "string") {
      lazy.log.warn("_populateURLParams: extraURLParams is not a string");
      return false;
    }
    let urlParams;
    try {
      if (extraURLParams) {
        urlParams = JSON.parse(extraURLParams);
        if (typeof urlParams != "object") {
          lazy.log.warn(
            "_populateURLParams: extraURLParams is not a stringified object"
          );
          return false;
        }
      }
    } catch (ex) {
      lazy.log.warn("_populateURLParams: extraURLParams is not a JSON object");
      return false;
    }
    if (urlParams) {
      // Expected to JSON parse the following for FxA flow parameters:
      //
      // {String} flow_id - Flow Id, such as '5445b28b8b7ba6cf71e345f8fff4bc59b2a514f78f3e2cc99b696449427fd445'
      // {Number} flow_begin_time - Flow begin timestamp, such as 1590780440325
      // {String} device_id - Device Id, such as '7e450f3337d3479b8582ea1c9bb5ba6c'
      if (
        (urlParams.flow_begin_time &&
          urlParams.flow_begin_time.toString().length !==
            FLOW_BEGIN_TIME_LENGTH) ||
        (urlParams.flow_id && urlParams.flow_id.length !== FLOW_ID_LENGTH)
      ) {
        lazy.log.warn(
          "_populateURLParams: flow parameters are not properly structured"
        );
        return false;
      }

      // The regex that the name of each param must match - there's no
      // character restriction on the value - they will be escaped as necessary.
      let reSimpleString = /^[-_a-zA-Z0-9]*$/;
      for (let name in urlParams) {
        let value = urlParams[name];
        const validName =
          name.startsWith("utm_") ||
          name === "entrypoint_experiment" ||
          name === "entrypoint_variation" ||
          name === "flow_begin_time" ||
          name === "flow_id" ||
          name === "device_id";
        if (
          typeof name != "string" ||
          !validName ||
          !reSimpleString.test(name)
        ) {
          lazy.log.warn("_populateURLParams: invalid campaign param specified");
          return false;
        }
        url.searchParams.append(name, value);
      }
    }
    return true;
  },
  /**
   * Tear down a tour from a tab e.g. upon switching/closing tabs.
   */
  async teardownTourForBrowser(aWindow, aBrowser, aTourPageClosing = false) {
    lazy.log.debug(
      "teardownTourForBrowser: aBrowser = ",
      aBrowser,
      aTourPageClosing
    );

    let openTourBrowsers = this.tourBrowsersByWindow.get(aWindow);
    if (aTourPageClosing && openTourBrowsers) {
      openTourBrowsers.delete(aBrowser);
    }

    this.hideHighlight(aWindow);
    this.hideInfo(aWindow);

    await this.removePanelListeners(aWindow);

    this.noautohideMenus.clear();

    // If there are no more tour tabs left in the window, teardown the tour for the whole window.
    if (!openTourBrowsers || openTourBrowsers.size == 0) {
      this.teardownTourForWindow(aWindow);
    }
  },

  /**
   * Remove the listeners to a panel when tearing the tour down.
   */
  async removePanelListeners(aWindow) {
    let panels = [
      {
        name: "appMenu",
        node: aWindow.PanelUI.panel,
        events: [
          ["popuphidden", this.onPanelHidden],
          ["popuphiding", this.onAppMenuHiding],
          ["ViewShowing", this.onAppMenuSubviewShowing],
        ],
      },
    ];
    for (let panel of panels) {
      // Ensure the menu panel is hidden and clean up panel listeners after calling hideMenu.
      if (panel.node.state != "closed") {
        await new Promise(resolve => {
          panel.node.addEventListener("popuphidden", resolve, { once: true });
          this.hideMenu(aWindow, panel.name);
        });
      }
      for (let [name, listener] of panel.events) {
        panel.node.removeEventListener(name, listener);
      }
    }
  },

  /**
   * Tear down all tours for a ChromeWindow.
   */
  teardownTourForWindow(aWindow) {
    lazy.log.debug("teardownTourForWindow");
    aWindow.gBrowser.tabContainer.removeEventListener("TabSelect", this);
    aWindow.removeEventListener("SSWindowClosing", this);

    this.tourBrowsersByWindow.delete(aWindow);
  },

  // This function is copied to UITourListener.
  isSafeScheme(aURI) {
    let allowedSchemes = new Set(["https", "about"]);
    if (!allowedSchemes.has(aURI.scheme)) {
      lazy.log.error("Unsafe scheme:", aURI.scheme);
      return false;
    }

    return true;
  },

  resolveURL(aBrowser, aURL) {
    try {
      let uri = Services.io.newURI(aURL, null, aBrowser.currentURI);

      if (!this.isSafeScheme(uri)) {
        return null;
      }

      return uri.spec;
    } catch (e) {}

    return null;
  },

  sendPageCallback(aBrowser, aCallbackID, aData = {}) {
    let detail = { data: aData, callbackID: aCallbackID };
    lazy.log.debug("sendPageCallback", detail);
    let contextToVisit = aBrowser.browsingContext;
    let global = contextToVisit.currentWindowGlobal;
    let actor = global.getActor("UITour");
    actor.sendAsyncMessage("UITour:SendPageCallback", detail);
  },

  isElementVisible(aElement) {
    let targetStyle = aElement.ownerGlobal.getComputedStyle(aElement);
    return (
      !aElement.ownerDocument.hidden &&
      targetStyle.display != "none" &&
      targetStyle.visibility == "visible"
    );
  },

  getTarget(aWindow, aTargetName) {
    lazy.log.debug("getTarget:", aTargetName);
    if (typeof aTargetName != "string" || !aTargetName) {
      lazy.log.warn("getTarget: Invalid target name specified");
      return Promise.reject("Invalid target name specified");
    }

    let targetObject = this.targets.get(aTargetName);
    if (!targetObject) {
      lazy.log.warn(
        "getTarget: The specified target name is not in the allowed set"
      );
      return Promise.reject(
        "The specified target name is not in the allowed set"
      );
    }

    return new Promise(resolve => {
      let targetQuery = targetObject.query;
      aWindow.PanelUI.ensureReady()
        .then(() => {
          let node;
          if (typeof targetQuery == "function") {
            try {
              node = targetQuery(aWindow.document);
            } catch (ex) {
              lazy.log.warn("getTarget: Error running target query:", ex);
              node = null;
            }
          } else {
            node = this.getNodeFromDocument(aWindow.document, targetQuery);
          }

          resolve({
            addTargetListener: targetObject.addTargetListener,
            infoPanelOffsetX: targetObject.infoPanelOffsetX,
            infoPanelOffsetY: targetObject.infoPanelOffsetY,
            infoPanelPosition: targetObject.infoPanelPosition,
            node,
            removeTargetListener: targetObject.removeTargetListener,
            targetName: aTargetName,
            widgetName: targetObject.widgetName,
            allowAdd: targetObject.allowAdd,
          });
        })
        .catch(lazy.log.error);
    });
  },

  targetIsInAppMenu(aTarget) {
    let targetElement = aTarget.node;
    // Use the widget for filtering if it exists since the target may be the icon inside.
    if (aTarget.widgetName) {
      let doc = aTarget.node.ownerGlobal.document;
      targetElement =
        doc.getElementById(aTarget.widgetName) ||
        lazy.PanelMultiView.getViewNode(doc, aTarget.widgetName);
    }

    return targetElement.id.startsWith("appMenu-");
  },

  /**
   * Called before opening or after closing a highlight or an info tooltip to see if
   * we need to open or close the menu to see the annotation's anchor.
   *
   * @param {ChromeWindow} aWindow the chrome window
   * @param {bool} aShouldOpen true means we should open the menu, otherwise false
   * @param {object} aOptions Extra config arguments, example `autohide: true`.
   */
  _setMenuStateForAnnotation(aWindow, aShouldOpen, aOptions = {}) {
    lazy.log.debug(
      "_setMenuStateForAnnotation: Menu is expected to be:",
      aShouldOpen ? "open" : "closed"
    );
    let menu = aWindow.PanelUI.panel;

    // If the panel is in the desired state, we're done.
    let panelIsOpen = menu.state != "closed";
    if (aShouldOpen == panelIsOpen) {
      lazy.log.debug(
        "_setMenuStateForAnnotation: Menu already in expected state"
      );
      return Promise.resolve();
    }

    // Actually show or hide the menu
    let promise = null;
    if (aShouldOpen) {
      lazy.log.debug("_setMenuStateForAnnotation: Opening the menu");
      promise = new Promise(resolve => {
        this.showMenu(aWindow, "appMenu", resolve, aOptions);
      });
    } else if (!this.noautohideMenus.has("appMenu")) {
      // If the menu was opened explictly by api user through `Mozilla.UITour.showMenu`,
      // it should be closed explictly by api user through `Mozilla.UITour.hideMenu`.
      // So we shouldn't get to here to close it for the highlight/info annotation.
      lazy.log.debug("_setMenuStateForAnnotation: Closing the menu");
      promise = new Promise(resolve => {
        menu.addEventListener("popuphidden", resolve, { once: true });
        this.hideMenu(aWindow, "appMenu");
      });
    }
    return promise;
  },

  /**
   * Ensure the target's visibility and the open/close states of menus for the target.
   *
   * @param {ChromeWindow} aChromeWindow The chrome window
   * @param {object} aTarget The target on which we show highlight or show info.
   * @param {object} aOptions Extra config arguments, example `autohide: true`.
   */
  async _ensureTarget(aChromeWindow, aTarget, aOptions = {}) {
    let shouldOpenAppMenu = false;
    if (this.targetIsInAppMenu(aTarget)) {
      shouldOpenAppMenu = true;
    }

    // Prevent showing a panel at an undefined position, but when it's tucked
    // away inside a panel, we skip this check.
    if (
      !aTarget.node.closest("panelview") &&
      !this.isElementVisible(aTarget.node)
    ) {
      return Promise.reject(
        `_ensureTarget: Reject the ${
          aTarget.name || aTarget.targetName
        } target since it isn't visible.`
      );
    }

    let menuClosePromises = [];
    if (!shouldOpenAppMenu) {
      menuClosePromises.push(
        this._setMenuStateForAnnotation(aChromeWindow, false)
      );
    }

    let promise = Promise.all(menuClosePromises);
    await promise;
    if (shouldOpenAppMenu) {
      promise = this._setMenuStateForAnnotation(aChromeWindow, true, aOptions);
    }
    return promise;
  },

  /**
   * The node to which a highlight or notification(-popup) is anchored is sometimes
   * obscured because it may be inside an overflow menu. This function should figure
   * that out and offer the overflow chevron as an alternative.
   *
   * @param {ChromeWindow} aChromeWindow The chrome window
   * @param {object} aTarget The target object whose node is supposed to be the anchor
   * @type {Node}
   */
  async _correctAnchor(aChromeWindow, aTarget) {
    // PanelMultiView's like the AppMenu might shuffle the DOM, which might result
    // in our anchor being invalidated if it was anonymous content (since the XBL
    // binding it belonged to got destroyed). We work around this by re-querying for
    // the node and stuffing it into the old anchor structure.
    let refreshedTarget = await this.getTarget(
      aChromeWindow,
      aTarget.targetName
    );
    let node = (aTarget.node = refreshedTarget.node);
    // If the target is in the overflow panel, just return the overflow button.
    if (node.closest("#widget-overflow-mainView")) {
      return lazy.CustomizableUI.getWidget(node.id).forWindow(aChromeWindow)
        .anchor;
    }
    return node;
  },

  /**
   * @param {ChromeWindow} aChromeWindow
   *   The chrome window that the highlight is in. Necessary since some targets
   *   are in a sub-frame so the defaultView is not the same as the chrome
   *   window.
   * @param {DOMElement} aTarget
   *   The element to highlight.
   * @param {string} [aEffect]
   *   The effect to use from UITour.highlightEffects or "none".
   * @param {object} [aOptions]
   *   Extra config arguments, example `autohide: true`.
   *   @see UITour.highlightEffects
   */
  async showHighlight(aChromeWindow, aTarget, aEffect = "none", aOptions = {}) {
    let showHighlightElement = aAnchorEl => {
      let highlighter = this.getHighlightAndMaybeCreate(aChromeWindow.document);

      let effect = aEffect;
      if (effect == "random") {
        // Exclude "random" from the randomly selected effects.
        let randomEffect =
          1 + Math.floor(Math.random() * (this.highlightEffects.length - 1));
        if (randomEffect == this.highlightEffects.length) {
          randomEffect--;
        } // On the order of 1 in 2^62 chance of this happening.
        effect = this.highlightEffects[randomEffect];
      }
      // Toggle the effect attribute to "none" and flush layout before setting it so the effect plays.
      highlighter.setAttribute("active", "none");
      aChromeWindow.getComputedStyle(highlighter).animationName;
      highlighter.setAttribute("active", effect);
      highlighter.parentElement.setAttribute("targetName", aTarget.targetName);
      highlighter.parentElement.hidden = false;

      let highlightAnchor = aAnchorEl;
      let targetRect = highlightAnchor.getBoundingClientRect();
      let highlightHeight = targetRect.height;
      let highlightWidth = targetRect.width;

      if (this.targetIsInAppMenu(aTarget)) {
        highlighter.classList.remove("rounded-highlight");
      } else {
        highlighter.classList.add("rounded-highlight");
      }
      if (
        highlightAnchor.classList.contains("toolbarbutton-1") &&
        highlightAnchor.getAttribute("cui-areatype") === "toolbar" &&
        highlightAnchor.getAttribute("overflowedItem") !== "true"
      ) {
        // A toolbar button in navbar has its clickable area an
        // inner-contained square while the button component itself is a tall
        // rectangle. We adjust the highlight area to a square as well.
        highlightHeight = highlightWidth;
      }

      highlighter.style.height = highlightHeight + "px";
      highlighter.style.width = highlightWidth + "px";

      // Close a previous highlight so we can relocate the panel.
      if (
        highlighter.parentElement.state == "showing" ||
        highlighter.parentElement.state == "open"
      ) {
        lazy.log.debug("showHighlight: Closing previous highlight first");
        highlighter.parentElement.hidePopup();
      }
      /* The "overlap" position anchors from the top-left but we want to centre highlights at their
         minimum size. */
      let highlightWindow = aChromeWindow;
      let highlightStyle = highlightWindow.getComputedStyle(highlighter);
      let highlightHeightWithMin = Math.max(
        highlightHeight,
        parseFloat(highlightStyle.minHeight)
      );
      let highlightWidthWithMin = Math.max(
        highlightWidth,
        parseFloat(highlightStyle.minWidth)
      );
      let offsetX = (targetRect.width - highlightWidthWithMin) / 2;
      let offsetY = (targetRect.height - highlightHeightWithMin) / 2;
      this._addAnnotationPanelMutationObserver(highlighter.parentElement);
      highlighter.parentElement.openPopup(
        highlightAnchor,
        "overlap",
        offsetX,
        offsetY
      );
    };

    try {
      await this._ensureTarget(aChromeWindow, aTarget, aOptions);
      let anchorEl = await this._correctAnchor(aChromeWindow, aTarget);
      showHighlightElement(anchorEl);
    } catch (e) {
      lazy.log.warn(e);
    }
  },

  _hideHighlightElement(aWindow) {
    let highlighter = this.getHighlightAndMaybeCreate(aWindow.document);
    this._removeAnnotationPanelMutationObserver(highlighter.parentElement);
    highlighter.parentElement.hidePopup();
    highlighter.removeAttribute("active");
  },

  hideHighlight(aWindow) {
    this._hideHighlightElement(aWindow);
    this._setMenuStateForAnnotation(aWindow, false);
  },

  /**
   * Show an info panel.
   *
   * @param {ChromeWindow} aChromeWindow
   * @param {Node}     aAnchor
   * @param {string}   [aTitle=""]
   * @param {string}   [aDescription=""]
   * @param {string}   [aIconURL=""]
   * @param {object[]} [aButtons=[]]
   * @param {object}   [aOptions={}]
   * @param {string}   [aOptions.closeButtonCallback]
   * @param {string}   [aOptions.targetCallback]
   */
  async showInfo(
    aChromeWindow,
    aAnchor,
    aTitle = "",
    aDescription = "",
    aIconURL = "",
    aButtons = [],
    aOptions = {}
  ) {
    let showInfoElement = aAnchorEl => {
      aAnchorEl.focus();

      let document = aChromeWindow.document;
      let tooltip = this.getTooltipAndMaybeCreate(document);
      let tooltipTitle = document.getElementById("UITourTooltipTitle");
      let tooltipDesc = document.getElementById("UITourTooltipDescription");
      let tooltipIcon = document.getElementById("UITourTooltipIcon");
      let tooltipButtons = document.getElementById("UITourTooltipButtons");

      if (tooltip.state == "showing" || tooltip.state == "open") {
        tooltip.hidePopup();
      }

      tooltipTitle.textContent = aTitle || "";
      tooltipDesc.textContent = aDescription || "";
      tooltipIcon.src = aIconURL || "";
      tooltipIcon.hidden = !aIconURL;

      while (tooltipButtons.firstChild) {
        tooltipButtons.firstChild.remove();
      }

      for (let button of aButtons) {
        let isButton = button.style != "text";
        let el = document.createXULElement(isButton ? "button" : "label");
        el.setAttribute(isButton ? "label" : "value", button.label);

        if (isButton) {
          if (button.iconURL) {
            el.setAttribute("image", button.iconURL);
          }

          if (button.style == "link") {
            el.setAttribute("class", "button-link");
          }

          if (button.style == "primary") {
            el.setAttribute("class", "button-primary");
          }

          // Don't close the popup or call the callback for style=text as they
          // aren't links/buttons.
          let callback = button.callback;
          el.addEventListener("command", event => {
            tooltip.hidePopup();
            callback(event);
          });
        }

        tooltipButtons.appendChild(el);
      }

      tooltipButtons.hidden = !aButtons.length;

      let tooltipClose = document.getElementById("UITourTooltipClose");
      let closeButtonCallback = () => {
        this.hideInfo(document.defaultView);
        if (aOptions && aOptions.closeButtonCallback) {
          aOptions.closeButtonCallback();
        }
      };
      tooltipClose.addEventListener("command", closeButtonCallback);

      let targetCallback = event => {
        let details = {
          target: aAnchor.targetName,
          type: event.type,
        };
        aOptions.targetCallback(details);
      };
      if (aOptions.targetCallback && aAnchor.addTargetListener) {
        aAnchor.addTargetListener(document, targetCallback);
      }

      tooltip.addEventListener(
        "popuphiding",
        function () {
          tooltipClose.removeEventListener("command", closeButtonCallback);
          if (aOptions.targetCallback && aAnchor.removeTargetListener) {
            aAnchor.removeTargetListener(document, targetCallback);
          }
        },
        { once: true }
      );

      tooltip.setAttribute("targetName", aAnchor.targetName);

      let alignment = "bottomright topright";
      if (aAnchor.infoPanelPosition) {
        alignment = aAnchor.infoPanelPosition;
      }

      let { infoPanelOffsetX: xOffset, infoPanelOffsetY: yOffset } = aAnchor;

      this._addAnnotationPanelMutationObserver(tooltip);
      tooltip.openPopup(aAnchorEl, alignment, xOffset || 0, yOffset || 0);
      if (tooltip.state == "closed") {
        document.defaultView.addEventListener(
          "endmodalstate",
          function () {
            tooltip.openPopup(aAnchorEl, alignment);
          },
          { once: true }
        );
      }
    };

    try {
      await this._ensureTarget(aChromeWindow, aAnchor);
      let anchorEl = await this._correctAnchor(aChromeWindow, aAnchor);
      showInfoElement(anchorEl);
    } catch (e) {
      lazy.log.warn(e);
    }
  },

  getHighlightContainerAndMaybeCreate(document) {
    let highlightContainer = document.getElementById(
      "UITourHighlightContainer"
    );
    if (!highlightContainer) {
      let wrapper = document.getElementById("UITourHighlightTemplate");
      wrapper.replaceWith(wrapper.content);
      highlightContainer = document.getElementById("UITourHighlightContainer");
    }

    return highlightContainer;
  },

  getTooltipAndMaybeCreate(document) {
    let tooltip = document.getElementById("UITourTooltip");
    if (!tooltip) {
      let wrapper = document.getElementById("UITourTooltipTemplate");
      wrapper.replaceWith(wrapper.content);
      tooltip = document.getElementById("UITourTooltip");
    }
    return tooltip;
  },

  getHighlightAndMaybeCreate(document) {
    let highlight = document.getElementById("UITourHighlight");
    if (!highlight) {
      let wrapper = document.getElementById("UITourHighlightTemplate");
      wrapper.replaceWith(wrapper.content);
      highlight = document.getElementById("UITourHighlight");
    }
    return highlight;
  },

  isInfoOnTarget(aChromeWindow, aTargetName) {
    let document = aChromeWindow.document;
    let tooltip = this.getTooltipAndMaybeCreate(document);
    return (
      tooltip.getAttribute("targetName") == aTargetName &&
      tooltip.state != "closed"
    );
  },

  _hideInfoElement(aWindow) {
    let document = aWindow.document;
    let tooltip = this.getTooltipAndMaybeCreate(document);
    this._removeAnnotationPanelMutationObserver(tooltip);
    tooltip.hidePopup();
    let tooltipButtons = document.getElementById("UITourTooltipButtons");
    while (tooltipButtons.firstChild) {
      tooltipButtons.firstChild.remove();
    }
  },

  hideInfo(aWindow) {
    this._hideInfoElement(aWindow);
    this._setMenuStateForAnnotation(aWindow, false);
  },

  showMenu(aWindow, aMenuName, aOpenCallback = null, aOptions = {}) {
    lazy.log.debug("showMenu:", aMenuName);
    function openMenuButton(aMenuBtn) {
      if (!aMenuBtn || !aMenuBtn.hasMenu() || aMenuBtn.open) {
        if (aOpenCallback) {
          aOpenCallback();
        }
        return;
      }
      if (aOpenCallback) {
        aMenuBtn.addEventListener("popupshown", aOpenCallback, { once: true });
      }
      aMenuBtn.openMenu(true);
    }

    if (aMenuName == "appMenu") {
      let menu = {
        onPanelHidden: this.onPanelHidden,
      };
      menu.node = aWindow.PanelUI.panel;
      menu.onPopupHiding = this.onAppMenuHiding;
      menu.onViewShowing = this.onAppMenuSubviewShowing;
      menu.show = () => aWindow.PanelUI.show();

      if (!aOptions.autohide) {
        menu.node.setAttribute("noautohide", "true");
      }
      // If the popup is already opened, don't recreate the widget as it may cause a flicker.
      if (menu.node.state != "open") {
        this.recreatePopup(menu.node);
      }
      if (aOpenCallback) {
        menu.node.addEventListener("popupshown", aOpenCallback, { once: true });
      }
      menu.node.addEventListener("popuphidden", menu.onPanelHidden);
      menu.node.addEventListener("popuphiding", menu.onPopupHiding);
      menu.node.addEventListener("ViewShowing", menu.onViewShowing);
      menu.show();
    } else if (aMenuName == "bookmarks") {
      let menuBtn = aWindow.document.getElementById("bookmarks-menu-button");
      openMenuButton(menuBtn);
    } else if (aMenuName == "urlbar") {
      let urlbar = aWindow.gURLBar;
      if (aOpenCallback) {
        urlbar.panel.addEventListener("popupshown", aOpenCallback, {
          once: true,
        });
      }
      urlbar.focus();
      // To demonstrate the ability of searching, we type "Firefox" in advance
      // for URLBar's dropdown. To limit the search results on browser-related
      // items, we use "Firefox" hard-coded rather than l10n brandShortName
      // entity to avoid unrelated or unpredicted results for, like, Nightly
      // or translated entites.
      const SEARCH_STRING = "Firefox";
      urlbar.value = SEARCH_STRING;
      urlbar.select();
      urlbar.startQuery({
        searchString: SEARCH_STRING,
        allowAutofill: false,
      });
    }
  },

  hideMenu(aWindow, aMenuName) {
    lazy.log.debug("hideMenu:", aMenuName);
    function closeMenuButton(aMenuBtn) {
      if (aMenuBtn && aMenuBtn.hasMenu()) {
        aMenuBtn.openMenu(false);
      }
    }

    if (aMenuName == "appMenu") {
      aWindow.PanelUI.hide();
    } else if (aMenuName == "bookmarks") {
      let menuBtn = aWindow.document.getElementById("bookmarks-menu-button");
      closeMenuButton(menuBtn);
    } else if (aMenuName == "urlbar") {
      aWindow.gURLBar.view.close();
    }
  },

  showNewTab(aWindow, aBrowser) {
    aWindow.gURLBar.focus();
    let url = "about:newtab";
    aWindow.openLinkIn(url, "current", {
      targetBrowser: aBrowser,
      triggeringPrincipal:
        Services.scriptSecurityManager.createContentPrincipal(
          Services.io.newURI(url),
          {}
        ),
    });
  },

  showProtectionReport(aWindow, aBrowser) {
    let url = "about:protections";
    aWindow.openLinkIn(url, "current", {
      targetBrowser: aBrowser,
      triggeringPrincipal:
        Services.scriptSecurityManager.createContentPrincipal(
          Services.io.newURI(url),
          {}
        ),
    });
  },

  _hideAnnotationsForPanel(aEvent, aShouldClosePanel, aTargetPositionCallback) {
    let win = aEvent.target.ownerGlobal;
    let hideHighlightMethod = null;
    let hideInfoMethod = null;
    if (aShouldClosePanel) {
      hideHighlightMethod = aWin => this.hideHighlight(aWin);
      hideInfoMethod = aWin => this.hideInfo(aWin);
    } else {
      // Don't have to close panel, let's only hide annotation elements
      hideHighlightMethod = aWin => this._hideHighlightElement(aWin);
      hideInfoMethod = aWin => this._hideInfoElement(aWin);
    }
    let annotationElements = new Map([
      // [annotationElement (panel), method to hide the annotation]
      [
        this.getHighlightContainerAndMaybeCreate(win.document),
        hideHighlightMethod,
      ],
      [this.getTooltipAndMaybeCreate(win.document), hideInfoMethod],
    ]);
    annotationElements.forEach((hideMethod, annotationElement) => {
      if (annotationElement.state != "closed") {
        let targetName = annotationElement.getAttribute("targetName");
        UITour.getTarget(win, targetName)
          .then(aTarget => {
            // Since getTarget is async, we need to make sure that the target hasn't
            // changed since it may have just moved to somewhere outside of the app menu.
            if (
              annotationElement.getAttribute("targetName") !=
                aTarget.targetName ||
              annotationElement.state == "closed" ||
              !aTargetPositionCallback(aTarget)
            ) {
              return;
            }
            hideMethod(win);
          })
          .catch(lazy.log.error);
      }
    });
  },

  onAppMenuHiding(aEvent) {
    UITour._hideAnnotationsForPanel(aEvent, true, UITour.targetIsInAppMenu);
  },

  onAppMenuSubviewShowing(aEvent) {
    UITour._hideAnnotationsForPanel(aEvent, false, UITour.targetIsInAppMenu);
  },

  onPanelHidden(aEvent) {
    aEvent.target.removeAttribute("noautohide");
    UITour.recreatePopup(aEvent.target);
    UITour.clearAvailableTargetsCache();
  },

  recreatePopup(aPanel) {
    // After changing popup attributes that relate to how the native widget is created
    // (e.g. @noautohide) we need to re-create the frame/widget for it to take effect.
    if (aPanel.hidden) {
      // If the panel is already hidden, we don't need to recreate it but flush
      // in case someone just hid it.
      aPanel.clientWidth; // flush
      return;
    }
    aPanel.hidden = true;
    aPanel.clientWidth; // flush
    aPanel.hidden = false;
  },

  getConfiguration(aBrowser, aWindow, aConfiguration, aCallbackID) {
    switch (aConfiguration) {
      case "appinfo":
        this.getAppInfo(aBrowser, aWindow, aCallbackID);
        break;
      case "availableTargets":
        this.getAvailableTargets(aBrowser, aWindow, aCallbackID);
        break;
      case "search":
      case "selectedSearchEngine":
        Services.search
          .getVisibleEngines()
          .then(engines => {
            let { defaultEngine } = Services.search;
            this.sendPageCallback(aBrowser, aCallbackID, {
              searchEngineIdentifier: defaultEngine.isAppProvided
                ? defaultEngine.id
                : null,
              engines: engines
                .filter(engine => engine.isAppProvided)
                .map(engine => TARGET_SEARCHENGINE_PREFIX + engine.id),
            });
          })
          .catch(() => {
            this.sendPageCallback(aBrowser, aCallbackID, {
              engines: [],
              searchEngineIdentifier: "",
            });
          });
        break;
      case "fxa":
        this.getFxA(aBrowser, aCallbackID);
        break;
      case "fxaConnections":
        this.getFxAConnections(aBrowser, aCallbackID);
        break;

      // NOTE: 'sync' is deprecated and should be removed in Firefox 73 (because
      // by then, all consumers will have upgraded to use 'fxa' in that version
      // and later.)
      case "sync":
        this.sendPageCallback(aBrowser, aCallbackID, {
          setup: Services.prefs.prefHasUserValue("services.sync.username"),
          desktopDevices: Services.prefs.getIntPref(
            "services.sync.clients.devices.desktop",
            0
          ),
          mobileDevices: Services.prefs.getIntPref(
            "services.sync.clients.devices.mobile",
            0
          ),
          totalDevices: Services.prefs.getIntPref(
            "services.sync.numClients",
            0
          ),
        });
        break;
      case "canReset":
        this.sendPageCallback(
          aBrowser,
          aCallbackID,
          lazy.ResetProfile.resetSupported()
        );
        break;
      default:
        lazy.log.error(
          "getConfiguration: Unknown configuration requested: " + aConfiguration
        );
        break;
    }
  },

  async setConfiguration(aWindow, aConfiguration, _aValue) {
    switch (aConfiguration) {
      case "defaultBrowser":
        // Ignore aValue in this case because the default browser can only
        // be set, not unset.
        try {
          let shell = aWindow.getShellService();
          if (shell) {
            await shell.setDefaultBrowser(false);
          }
        } catch (e) {}
        break;
      default:
        lazy.log.error(
          "setConfiguration: Unknown configuration requested: " + aConfiguration
        );
        break;
    }
  },

  // Get data about the local FxA account. This should be a low-latency request
  // - everything returned here can be obtained locally without hitting any
  // remote servers. See also `getFxAConnections()`
  getFxA(aBrowser, aCallbackID) {
    (async () => {
      let setup = !!(await lazy.fxAccounts.getSignedInUser());
      let result = { setup };
      if (!setup) {
        this.sendPageCallback(aBrowser, aCallbackID, result);
        return;
      }
      // We are signed in so need to build a richer result.
      // Each of the "browser services" - currently only "sync" is supported
      result.browserServices = {};
      let hasSync = Services.prefs.prefHasUserValue("services.sync.username");
      if (hasSync) {
        result.browserServices.sync = {
          // We always include 'setup' for b/w compatibility.
          setup: true,
          desktopDevices: Services.prefs.getIntPref(
            "services.sync.clients.devices.desktop",
            0
          ),
          mobileDevices: Services.prefs.getIntPref(
            "services.sync.clients.devices.mobile",
            0
          ),
          totalDevices: Services.prefs.getIntPref(
            "services.sync.numClients",
            0
          ),
        };
      }
      // And the account state.
      result.accountStateOK = await lazy.fxAccounts.hasLocalSession();
      this.sendPageCallback(aBrowser, aCallbackID, result);
    })().catch(err => {
      lazy.log.error(err);
      this.sendPageCallback(aBrowser, aCallbackID, {});
    });
  },

  // Get data about the FxA account "connections" (ie, other devices, other
  // apps, etc. Note that this is likely to be a high-latency request - we will
  // usually hit the FxA servers to obtain this info.
  getFxAConnections(aBrowser, aCallbackID) {
    (async () => {
      let setup = !!(await lazy.fxAccounts.getSignedInUser());
      let result = { setup };
      if (!setup) {
        this.sendPageCallback(aBrowser, aCallbackID, result);
        return;
      }
      // We are signed in so need to build a richer result.
      let devices = lazy.fxAccounts.device.recentDeviceList;
      // A recent device list is fine, but if we don't even have that we should
      // wait for it to be fetched.
      if (!devices) {
        try {
          await lazy.fxAccounts.device.refreshDeviceList();
        } catch (ex) {
          lazy.log.warn("failed to fetch device list", ex);
        }
        devices = lazy.fxAccounts.device.recentDeviceList;
      }
      if (devices) {
        // A falsey `devices` should be impossible, so we omit `devices` from
        // the result object so the consuming page can try to differentiate
        // between "no additional devices" and "something's wrong"
        result.numOtherDevices = Math.max(0, devices.length - 1);
        result.numDevicesByType = devices
          .filter(d => !d.isCurrentDevice)
          .reduce((accum, d) => {
            let type = d.type || "unknown";
            accum[type] = (accum[type] || 0) + 1;
            return accum;
          }, {});
      }

      try {
        // Each of the "account services", which we turn into a map keyed by ID.
        let attachedClients = await lazy.fxAccounts.listAttachedOAuthClients();
        result.accountServices = attachedClients
          .filter(c => !!c.id)
          .reduce((accum, c) => {
            accum[c.id] = {
              id: c.id,
              lastAccessedWeeksAgo: c.lastAccessedDaysAgo
                ? Math.floor(c.lastAccessedDaysAgo / 7)
                : null,
            };
            return accum;
          }, {});
      } catch (ex) {
        lazy.log.warn("Failed to build the attached clients list", ex);
      }
      this.sendPageCallback(aBrowser, aCallbackID, result);
    })().catch(err => {
      lazy.log.error(err);
      this.sendPageCallback(aBrowser, aCallbackID, {});
    });
  },

  getAppInfo(aBrowser, aWindow, aCallbackID) {
    (async () => {
      let appinfo = { version: Services.appinfo.version };

      // Identifier of the partner repack, as stored in preference "distribution.id"
      // and included in Firefox and other update pings. Note this is not the same as
      // Services.appinfo.distributionID (value of MOZ_DISTRIBUTION_ID is set at build time).
      let distribution = Services.prefs
        .getDefaultBranch("distribution.")
        .getCharPref("id", "default");
      appinfo.distribution = distribution;

      // Update channel, in a way that preserves 'beta' for RC beta builds:
      appinfo.defaultUpdateChannel = lazy.UpdateUtils.getUpdateChannel(
        false /* no partner ID */
      );

      let isDefaultBrowser = null;
      try {
        let shell = aWindow.getShellService();
        if (shell) {
          isDefaultBrowser = shell.isDefaultBrowser(false);
        }
      } catch (e) {}
      appinfo.defaultBrowser = isDefaultBrowser;

      let canSetDefaultBrowserInBackground = true;
      if (AppConstants.platform == "win" || AppConstants.platform == "macosx") {
        canSetDefaultBrowserInBackground = false;
      } else if (AppConstants.platform == "linux") {
        // The ShellService may not exist on some versions of Linux.
        try {
          aWindow.getShellService();
        } catch (e) {
          canSetDefaultBrowserInBackground = null;
        }
      }

      appinfo.canSetDefaultBrowserInBackground =
        canSetDefaultBrowserInBackground;

      // Expose Profile creation and last reset dates in weeks.
      const ONE_WEEK = 7 * 24 * 60 * 60 * 1000;
      let profileAge = await lazy.ProfileAge();
      let createdDate = await profileAge.created;
      let resetDate = await profileAge.reset;
      let createdWeeksAgo = Math.floor((Date.now() - createdDate) / ONE_WEEK);
      let resetWeeksAgo = null;
      if (resetDate) {
        resetWeeksAgo = Math.floor((Date.now() - resetDate) / ONE_WEEK);
      }
      appinfo.profileCreatedWeeksAgo = createdWeeksAgo;
      appinfo.profileResetWeeksAgo = resetWeeksAgo;

      this.sendPageCallback(aBrowser, aCallbackID, appinfo);
    })().catch(err => {
      lazy.log.error(err);
      this.sendPageCallback(aBrowser, aCallbackID, {});
    });
  },

  getAvailableTargets(aBrowser, aChromeWindow, aCallbackID) {
    (async () => {
      let window = aChromeWindow;
      let data = this.availableTargetsCache.get(window);
      if (data) {
        lazy.log.debug(
          "getAvailableTargets: Using cached targets list",
          data.targets.join(",")
        );
        this.sendPageCallback(aBrowser, aCallbackID, data);
        return;
      }

      let promises = [];
      for (let targetName of this.targets.keys()) {
        promises.push(this.getTarget(window, targetName));
      }
      let targetObjects = await Promise.all(promises);

      let targetNames = [];
      for (let targetObject of targetObjects) {
        if (targetObject.node) {
          targetNames.push(targetObject.targetName);
        }
      }

      data = {
        targets: targetNames,
      };
      this.availableTargetsCache.set(window, data);
      this.sendPageCallback(aBrowser, aCallbackID, data);
    })().catch(err => {
      lazy.log.error(err);
      this.sendPageCallback(aBrowser, aCallbackID, {
        targets: [],
      });
    });
  },

  addNavBarWidget(aTarget, aBrowser, aCallbackID) {
    if (aTarget.node) {
      lazy.log.error(
        "addNavBarWidget: can't add a widget already present:",
        aTarget
      );
      return;
    }
    if (!aTarget.allowAdd) {
      lazy.log.error(
        "addNavBarWidget: not allowed to add this widget:",
        aTarget
      );
      return;
    }
    if (!aTarget.widgetName) {
      lazy.log.error(
        "addNavBarWidget: can't add a widget without a widgetName property:",
        aTarget
      );
      return;
    }

    lazy.CustomizableUI.addWidgetToArea(
      aTarget.widgetName,
      lazy.CustomizableUI.AREA_NAVBAR
    );
    lazy.BrowserUsageTelemetry.recordWidgetChange(
      aTarget.widgetName,
      lazy.CustomizableUI.AREA_NAVBAR,
      "uitour"
    );
    this.sendPageCallback(aBrowser, aCallbackID);
  },

  _addAnnotationPanelMutationObserver(aPanelEl) {
    if (AppConstants.platform == "linux") {
      let observer = this._annotationPanelMutationObservers.get(aPanelEl);
      if (observer) {
        return;
      }
      let win = aPanelEl.ownerGlobal;
      observer = new win.MutationObserver(this._annotationMutationCallback);
      this._annotationPanelMutationObservers.set(aPanelEl, observer);
      let observerOptions = {
        attributeFilter: ["height", "width"],
        attributes: true,
      };
      observer.observe(aPanelEl, observerOptions);
    }
  },

  _removeAnnotationPanelMutationObserver(aPanelEl) {
    if (AppConstants.platform == "linux") {
      let observer = this._annotationPanelMutationObservers.get(aPanelEl);
      if (observer) {
        observer.disconnect();
        this._annotationPanelMutationObservers.delete(aPanelEl);
      }
    }
  },

  /**
   * Workaround for Ubuntu panel craziness in bug 970788 where incorrect sizes get passed to
   * nsXULPopupManager::PopupResized and lead to incorrect width and height attributes getting
   * set on the panel.
   */
  _annotationMutationCallback(aMutations) {
    for (let mutation of aMutations) {
      // Remove both attributes at once and ignore remaining mutations to be proccessed.
      mutation.target.removeAttribute("width");
      mutation.target.removeAttribute("height");
      return;
    }
  },

  async selectSearchEngine(id) {
    let engine = Services.search.getEngineById(id);
    if (!engine || engine.hidden) {
      throw new Error("selectSearchEngine could not find engine with given ID");
    }
    return Services.search.setDefault(
      engine,
      Ci.nsISearchService.CHANGE_REASON_UITOUR
    );
  },

  notify(eventName, params) {
    for (let window of Services.wm.getEnumerator("navigator:browser")) {
      if (window.closed) {
        continue;
      }

      let openTourBrowsers = this.tourBrowsersByWindow.get(window);
      if (!openTourBrowsers) {
        continue;
      }

      for (let browser of openTourBrowsers) {
        let detail = {
          event: eventName,
          params,
        };
        let contextToVisit = browser.browsingContext;
        let global = contextToVisit.currentWindowGlobal;
        let actor = global.getActor("UITour");
        actor.sendAsyncMessage("UITour:SendPageNotification", detail);
      }
    }
  },
};

UITour.init();
