/* - 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 globals from the files imported by the .xul files.
/* import-globals-from subdialogs.js */
/* import-globals-from main.js */
/* import-globals-from home.js */
/* import-globals-from search.js */
/* import-globals-from containers.js */
/* import-globals-from privacy.js */
/* import-globals-from sync.js */
/* import-globals-from findInPage.js */
/* import-globals-from ../../../base/content/utilityOverlay.js */
/* import-globals-from ../../../../toolkit/content/preferencesBindings.js */
/* global MozXULElement */

"use strict";

var {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");

ChromeUtils.defineModuleGetter(this, "AMTelemetry",
                               "resource://gre/modules/AddonManager.jsm");
ChromeUtils.defineModuleGetter(this, "formAutofillParent",
                               "resource://formautofill/FormAutofillParent.jsm");

var gLastHash = "";
const gXULDOMParser = new DOMParser();

var gCategoryInits = new Map();
function init_category_if_required(category) {
  let categoryInfo = gCategoryInits.get(category);
  if (!categoryInfo) {
    throw "Unknown in-content prefs category! Can't init " + category;
  }
  if (categoryInfo.inited) {
    return;
  }
  categoryInfo.init();
}

function register_module(categoryName, categoryObject) {
  gCategoryInits.set(categoryName, {
    inited: false,
    init() {
      let template = document.getElementById("template-" + categoryName);
      if (template) {
        // Replace the template element with the nodes from the parsed comment
        // string.
        let frag = MozXULElement.parseXULToFragment(template.firstChild.data);

        // Gather the to-be-translated elements so that we could pass them to
        // l10n.translateElements() and get a translated promise.
        // Here we loop through the first level elements (<hbox>/<groupbox>/<deck>/etc)
        // because we know that they are not implemented by XBL bindings,
        // so it's ok to get a reference of them before inserting the node
        // to the DOM.
        //
        // If we don't have to worry about XBL, this can simply be
        // let l10nUpdatedElements = Array.from(frag.querySelectorAll("[data-l10n-id]"))
        //
        // If we can get a translated promise after insertion, this can all be
        // removed (see bug 1520659.)
        let firstLevelElements = Array.from(frag.children);

        // Actually insert them into the DOM.
        template.replaceWith(frag);

        let l10nUpdatedElements = [];
        // Collect the elements from the newly inserted first level elements.
        for (let el of firstLevelElements) {
          l10nUpdatedElements = l10nUpdatedElements.concat(
            Array.from(el.querySelectorAll("[data-l10n-id]")));
        }

        // Set a promise on the categoryInfo object that the highlight code can await on.
        this.translated = document.l10n.translateElements(l10nUpdatedElements)
          .then(() => this.translated = undefined);

        // Asks Preferences to update the attribute value of the entire
        // document again (this can be simplified if we could seperate the
        // preferences of each pane.)
        Preferences.updateAllElements();
      }
      categoryObject.init();
      this.inited = true;
    },
  });
}

document.addEventListener("DOMContentLoaded", init_all, {once: true});

function init_all() {
  Preferences.forceEnableInstantApply();

  gSubDialog.init();
  register_module("paneGeneral", gMainPane);
  register_module("paneHome", gHomePane);
  register_module("paneSearch", gSearchPane);
  register_module("panePrivacy", gPrivacyPane);
  register_module("paneContainers", gContainersPane);
  if (Services.prefs.getBoolPref("identity.fxaccounts.enabled")) {
    document.getElementById("category-sync").hidden = false;
    register_module("paneSync", gSyncPane);
  }
  register_module("paneSearchResults", gSearchResultsPane);
  gSearchResultsPane.init();
  gMainPane.preInit();

  let categories = document.getElementById("categories");
  categories.addEventListener("select", event => gotoPref(event.target.value));

  document.documentElement.addEventListener("keydown", function(event) {
    if (event.keyCode == KeyEvent.DOM_VK_TAB) {
      categories.setAttribute("keyboard-navigation", "true");
    }
  });
  categories.addEventListener("mousedown", function() {
    this.removeAttribute("keyboard-navigation");
  });

  maybeDisplayPoliciesNotice();

  window.addEventListener("hashchange", onHashChange);
  gotoPref();

  let helpButton = document.getElementById("helpButton");
  let helpUrl = Services.urlFormatter.formatURLPref("app.support.baseURL") + "preferences";
  helpButton.setAttribute("href", helpUrl);

  document.getElementById("addonsButton")
    .addEventListener("click", () => {
      let mainWindow = window.docShell.rootTreeItem.domWindow;
      mainWindow.BrowserOpenAddonsMgr();
      AMTelemetry.recordLinkEvent({
        object: "aboutPreferences",
        value: "about:addons",
      });
    });

  document.dispatchEvent(new CustomEvent("Initialized", {
    "bubbles": true,
    "cancelable": true,
  }));
}

function telemetryBucketForCategory(category) {
  category = category.toLowerCase();
  switch (category) {
    case "containers":
    case "general":
    case "home":
    case "privacy":
    case "search":
    case "sync":
    case "searchresults":
      return category;
    default:
      return "unknown";
  }
}

function onHashChange() {
  gotoPref();
}

function gotoPref(aCategory) {
  let categories = document.getElementById("categories");
  const kDefaultCategoryInternalName = "paneGeneral";
  const kDefaultCategory = "general";
  let hash = document.location.hash;

  let category = aCategory || hash.substr(1) || kDefaultCategoryInternalName;
  let breakIndex = category.indexOf("-");
  // Subcategories allow for selecting smaller sections of the preferences
  // until proper search support is enabled (bug 1353954).
  let subcategory = breakIndex != -1 && category.substring(breakIndex + 1);
  if (subcategory) {
    category = category.substring(0, breakIndex);
  }
  category = friendlyPrefCategoryNameToInternalName(category);
  if (category != "paneSearchResults") {
    gSearchResultsPane.query = null;
    gSearchResultsPane.searchInput.value = "";
    gSearchResultsPane.getFindSelection(window).removeAllRanges();
    gSearchResultsPane.removeAllSearchTooltips();
    gSearchResultsPane.removeAllSearchMenuitemIndicators();
  } else if (!gSearchResultsPane.searchInput.value) {
    // Something tried to send us to the search results pane without
    // a query string. Default to the General pane instead.
    category = kDefaultCategoryInternalName;
    document.location.hash = kDefaultCategory;
    gSearchResultsPane.query = null;
  }

  // Updating the hash (below) or changing the selected category
  // will re-enter gotoPref.
  if (gLastHash == category && !subcategory)
    return;

  let item;
  if (category != "paneSearchResults") {
    item = categories.querySelector(".category[value=" + category + "]");
    if (!item) {
      category = kDefaultCategoryInternalName;
      item = categories.querySelector(".category[value=" + category + "]");
    }
  }

  try {
    init_category_if_required(category);
  } catch (ex) {
    Cu.reportError("Error initializing preference category " + category + ": " + ex);
    throw ex;
  }

  let friendlyName = internalPrefCategoryNameToFriendlyName(category);
  if (gLastHash || category != kDefaultCategoryInternalName || subcategory) {
    document.location.hash = friendlyName;
  }
  // Need to set the gLastHash before setting categories.selectedItem since
  // the categories 'select' event will re-enter the gotoPref codepath.
  gLastHash = category;
  if (item) {
    categories.selectedItem = item;
  } else {
    categories.clearSelection();
  }
  window.history.replaceState(category, document.title);
  search(category, "data-category");

  let mainContent = document.querySelector(".main-content");
  mainContent.scrollTop = 0;

  spotlight(subcategory, category);
}

function search(aQuery, aAttribute) {
  let mainPrefPane = document.getElementById("mainPrefPane");
  let elements = mainPrefPane.children;
  for (let element of elements) {
    // If the "data-hidden-from-search" is "true", the
    // element will not get considered during search.
    if (element.getAttribute("data-hidden-from-search") != "true" ||
        element.getAttribute("data-subpanel") == "true") {
      let attributeValue = element.getAttribute(aAttribute);
      if (attributeValue == aQuery) {
        element.hidden = false;
      } else {
        element.hidden = true;
      }
    } else if (element.getAttribute("data-hidden-from-search") == "true" &&
               !element.hidden) {
      element.hidden = true;
    }
    element.classList.remove("visually-hidden");
  }

  let keysets = mainPrefPane.getElementsByTagName("keyset");
  for (let element of keysets) {
    let attributeValue = element.getAttribute(aAttribute);
    if (attributeValue == aQuery)
      element.removeAttribute("disabled");
    else
      element.setAttribute("disabled", true);
  }
}

async function spotlight(subcategory, category) {
  let highlightedElements = document.querySelectorAll(".spotlight");
  if (highlightedElements.length) {
    for (let element of highlightedElements) {
      element.classList.remove("spotlight");
    }
  }
  if (subcategory) {
    scrollAndHighlight(subcategory, category);
  }
}

async function scrollAndHighlight(subcategory, category) {
  let element = document.querySelector(`[data-subcategory="${subcategory}"]`);
  if (!element) {
    return;
  }
  let header = getClosestDisplayedHeader(element);
  await gCategoryInits.get(category).translated;

  scrollContentTo(header);
  element.classList.add("spotlight");
}

/**
 * If there is no visible second level header it will return first level header,
 * otherwise return second level header.
 * @returns {Element} - The closest displayed header.
 */
function getClosestDisplayedHeader(element) {
  let header = element.closest("groupbox");
  let searchHeader = header.querySelector(".search-header");
  if (searchHeader && searchHeader.hidden &&
      header.previousElementSibling.classList.contains("subcategory")) {
    header = header.previousElementSibling;
  }
  return header;
}

function scrollContentTo(element) {
  const STICKY_CONTAINER_HEIGHT = document.querySelector(".sticky-container").clientHeight;
  let mainContent = document.querySelector(".main-content");
  let top = element.getBoundingClientRect().top - STICKY_CONTAINER_HEIGHT;
  mainContent.scroll({
    top,
    behavior: "smooth",
  });
}

function friendlyPrefCategoryNameToInternalName(aName) {
  if (aName.startsWith("pane"))
    return aName;
  return "pane" + aName.substring(0, 1).toUpperCase() + aName.substr(1);
}

// This function is duplicated inside of utilityOverlay.js's openPreferences.
function internalPrefCategoryNameToFriendlyName(aName) {
  return (aName || "").replace(/^pane./, function(toReplace) { return toReplace[4].toLowerCase(); });
}

// Put up a confirm dialog with "ok to restart", "revert without restarting"
// and "restart later" buttons and returns the index of the button chosen.
// We can choose not to display the "restart later", or "revert" buttons,
// altough the later still lets us revert by using the escape key.
//
// The constants are useful to interpret the return value of the function.
const CONFIRM_RESTART_PROMPT_RESTART_NOW = 0;
const CONFIRM_RESTART_PROMPT_CANCEL = 1;
const CONFIRM_RESTART_PROMPT_RESTART_LATER = 2;
async function confirmRestartPrompt(aRestartToEnable, aDefaultButtonIndex,
                                    aWantRevertAsCancelButton,
                                    aWantRestartLaterButton) {
  let [
    msg, title, restartButtonText, noRestartButtonText, restartLaterButtonText,
  ] = await document.l10n.formatValues([
    {id: aRestartToEnable ?
      "feature-enable-requires-restart" : "feature-disable-requires-restart"},
    {id: "should-restart-title"},
    {id: "should-restart-ok"},
    {id: "cancel-no-restart-button"},
    {id: "restart-later"},
  ]);

  // Set up the first (index 0) button:
  let buttonFlags = (Services.prompt.BUTTON_POS_0 *
                     Services.prompt.BUTTON_TITLE_IS_STRING);


  // Set up the second (index 1) button:
  if (aWantRevertAsCancelButton) {
    buttonFlags += (Services.prompt.BUTTON_POS_1 *
                    Services.prompt.BUTTON_TITLE_IS_STRING);
  } else {
    noRestartButtonText = null;
    buttonFlags += (Services.prompt.BUTTON_POS_1 *
                    Services.prompt.BUTTON_TITLE_CANCEL);
  }

  // Set up the third (index 2) button:
  if (aWantRestartLaterButton) {
    buttonFlags += (Services.prompt.BUTTON_POS_2 *
                    Services.prompt.BUTTON_TITLE_IS_STRING);
  } else {
    restartLaterButtonText = null;
  }

  switch (aDefaultButtonIndex) {
    case 0:
      buttonFlags += Services.prompt.BUTTON_POS_0_DEFAULT;
      break;
    case 1:
      buttonFlags += Services.prompt.BUTTON_POS_1_DEFAULT;
      break;
    case 2:
      buttonFlags += Services.prompt.BUTTON_POS_2_DEFAULT;
      break;
    default:
      break;
  }

  let buttonIndex = Services.prompt.confirmEx(window, title, msg, buttonFlags,
                                              restartButtonText, noRestartButtonText,
                                              restartLaterButtonText, null, {});

  // If we have the second confirmation dialog for restart, see if the user
  // cancels out at that point.
  if (buttonIndex == CONFIRM_RESTART_PROMPT_RESTART_NOW) {
    let cancelQuit = Cc["@mozilla.org/supports-PRBool;1"]
                       .createInstance(Ci.nsISupportsPRBool);
    Services.obs.notifyObservers(cancelQuit, "quit-application-requested",
                                  "restart");
    if (cancelQuit.data) {
      buttonIndex = CONFIRM_RESTART_PROMPT_CANCEL;
    }
  }
  return buttonIndex;
}

// This function is used to append search keywords found
// in the related subdialog to the button that will activate the subdialog.
function appendSearchKeywords(aId, keywords) {
  let element = document.getElementById(aId);
  let searchKeywords = element.getAttribute("searchkeywords");
  if (searchKeywords) {
    keywords.push(searchKeywords);
  }
  element.setAttribute("searchkeywords", keywords.join(" "));
}

function maybeDisplayPoliciesNotice() {
  if (Services.policies.status == Services.policies.ACTIVE) {
    document.getElementById("policies-container").removeAttribute("hidden");
  }
}

/**
 * Filter the lastFallbackLocale from availableLocales if it doesn't have all
 * of the needed strings.
 *
 * When the lastFallbackLocale isn't the defaultLocale, then by default only
 * fluent strings are included. To fully use that locale you need the langpack
 * to be installed, so if it isn't installed remove it from availableLocales.
 */
async function getAvailableLocales() {
  let {availableLocales, defaultLocale, lastFallbackLocale} = Services.locale;
  // If defaultLocale isn't lastFallbackLocale, then we still need the langpack
  // for lastFallbackLocale for it to be useful.
  if (defaultLocale != lastFallbackLocale) {
    let lastFallbackId = `langpack-${lastFallbackLocale}@firefox.mozilla.org`;
    let lastFallbackInstalled = await AddonManager.getAddonByID(lastFallbackId);
    if (!lastFallbackInstalled) {
      return availableLocales.filter(locale => locale != lastFallbackLocale);
    }
  }
  return availableLocales;
}