/* 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/. */

"use strict";

var EXPORTED_SYMBOLS = ["ShellService"];

const { AppConstants } = ChromeUtils.import(
  "resource://gre/modules/AppConstants.jsm"
);
const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
const { XPCOMUtils } = ChromeUtils.import(
  "resource://gre/modules/XPCOMUtils.jsm"
);
ChromeUtils.defineModuleGetter(
  this,
  "WindowsRegistry",
  "resource://gre/modules/WindowsRegistry.jsm"
);

/**
 * Internal functionality to save and restore the docShell.allow* properties.
 */
let ShellServiceInternal = {
  /**
   * Used to determine whether or not to offer "Set as desktop background"
   * functionality. Even if shell service is available it is not
   * guaranteed that it is able to set the background for every desktop
   * which is especially true for Linux with its many different desktop
   * environments.
   */
  get canSetDesktopBackground() {
    if (AppConstants.platform == "win" || AppConstants.platform == "macosx") {
      return true;
    }

    if (AppConstants.platform == "linux") {
      if (this.shellService) {
        let linuxShellService = this.shellService.QueryInterface(
          Ci.nsIGNOMEShellService
        );
        return linuxShellService.canSetDesktopBackground;
      }
    }

    return false;
  },

  isDefaultBrowserOptOut() {
    if (AppConstants.platform == "win") {
      let optOutValue = WindowsRegistry.readRegKey(
        Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER,
        "Software\\Mozilla\\Firefox",
        "DefaultBrowserOptOut"
      );
      WindowsRegistry.removeRegKey(
        Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER,
        "Software\\Mozilla\\Firefox",
        "DefaultBrowserOptOut"
      );
      if (optOutValue == "True") {
        Services.prefs.setBoolPref("browser.shell.checkDefaultBrowser", false);
        return true;
      }
    }
    return false;
  },

  /**
   * Used to determine whether or not to show a "Set Default Browser"
   * query dialog. This attribute is true if the application is starting
   * up and "browser.shell.checkDefaultBrowser" is true, otherwise it
   * is false.
   */
  _checkedThisSession: false,
  get shouldCheckDefaultBrowser() {
    // If we've already checked, the browser has been started and this is a
    // new window open, and we don't want to check again.
    if (this._checkedThisSession) {
      return false;
    }

    if (!Services.prefs.getBoolPref("browser.shell.checkDefaultBrowser")) {
      return false;
    }

    if (this.isDefaultBrowserOptOut()) {
      return false;
    }

    return true;
  },

  set shouldCheckDefaultBrowser(shouldCheck) {
    Services.prefs.setBoolPref(
      "browser.shell.checkDefaultBrowser",
      !!shouldCheck
    );
  },

  isDefaultBrowser(startupCheck, forAllTypes) {
    // If this is the first browser window, maintain internal state that we've
    // checked this session (so that subsequent window opens don't show the
    // default browser dialog).
    if (startupCheck) {
      this._checkedThisSession = true;
    }
    if (this.shellService) {
      return this.shellService.isDefaultBrowser(forAllTypes);
    }
    return false;
  },

  setAsDefault() {
    let claimAllTypes = true;
    let setAsDefaultError = false;
    if (AppConstants.platform == "win") {
      try {
        // In Windows 8+, the UI for selecting default protocol is much
        // nicer than the UI for setting file type associations. So we
        // only show the protocol association screen on Windows 8+.
        // Windows 8 is version 6.2.
        let version = Services.sysinfo.getProperty("version");
        claimAllTypes = parseFloat(version) < 6.2;
      } catch (ex) {}
    }
    try {
      ShellService.setDefaultBrowser(claimAllTypes, false);
    } catch (ex) {
      setAsDefaultError = true;
      Cu.reportError(ex);
    }
    // Here BROWSER_IS_USER_DEFAULT and BROWSER_SET_USER_DEFAULT_ERROR appear
    // to be inverse of each other, but that is only because this function is
    // called when the browser is set as the default. During startup we record
    // the BROWSER_IS_USER_DEFAULT value without recording BROWSER_SET_USER_DEFAULT_ERROR.
    Services.telemetry
      .getHistogramById("BROWSER_IS_USER_DEFAULT")
      .add(!setAsDefaultError);
    Services.telemetry
      .getHistogramById("BROWSER_SET_DEFAULT_ERROR")
      .add(setAsDefaultError);
  },
};

XPCOMUtils.defineLazyServiceGetter(
  ShellServiceInternal,
  "shellService",
  "@mozilla.org/browser/shell-service;1",
  Ci.nsIShellService
);

/**
 * The external API exported by this module.
 */
var ShellService = new Proxy(ShellServiceInternal, {
  get(target, name) {
    if (name in target) {
      return target[name];
    }
    if (target.shellService) {
      return target.shellService[name];
    }
    Services.console.logStringMessage(
      `${name} not found in ShellService: ${target.shellService}`
    );
    return undefined;
  },
});