/* - 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 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 */

"use strict";

ChromeUtils.import("resource://gre/modules/Services.jsm");
ChromeUtils.import("resource://gre/modules/AppConstants.jsm");

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

var gLastHash = "";

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() {
      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("paneSearch", gSearchPane);
  register_module("panePrivacy", gPrivacyPane);
  register_module("paneContainers", gContainersPane);
  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");
  });

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

  let helpButton = document.querySelector(".help-button > .text-link");
  let helpUrl = Services.urlFormatter.formatURLPref("app.support.baseURL") + "preferences";
  helpButton.setAttribute("href", helpUrl);

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

function telemetryBucketForCategory(category) {
  category = category.toLowerCase();
  switch (category) {
    case "containers":
    case "general":
    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);

  Services.telemetry
          .getHistogramById("FX_PREFERENCES_CATEGORY_OPENED_V2")
          .add(telemetryBucketForCategory(friendlyName));
}

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. This
    // should only be used when an element is still under
    // development and should not be shown for any reason.
    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;
      }
    }
    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) {
  let highlightedElements = document.querySelectorAll(".spotlight");
  if (highlightedElements.length) {
    for (let element of highlightedElements) {
      element.classList.remove("spotlight");
    }
  }
  if (subcategory) {
    if (!gSearchResultsPane.categoriesInitialized) {
      await waitForSystemAddonInjectionsFinished([{
        isGoingToInject: formAutofillParent.initialized,
        elementId: "formAutofillGroup",
      }]);
    }
    scrollAndHighlight(subcategory);
  }

  /**
   * Wait for system addons finished their dom injections.
   * @param {Array} addons - The system addon information array.
   * For example, the element is looked like
   * { isGoingToInject: true, elementId: "formAutofillGroup" }.
   * The `isGoingToInject` means the system addon will be visible or not,
   * and the `elementId` means the id of the element will be injected into the dom
   * if the `isGoingToInject` is true.
   * @returns {Promise} Will resolve once all injections are finished.
   */
  function waitForSystemAddonInjectionsFinished(addons) {
    return new Promise(resolve => {
      let elementIdSet = new Set();
      for (let addon of addons) {
        if (addon.isGoingToInject) {
          elementIdSet.add(addon.elementId);
        }
      }
      if (elementIdSet.size) {
        let observer = new MutationObserver(mutations => {
          for (let mutation of mutations) {
            for (let node of mutation.addedNodes) {
              elementIdSet.delete(node.id);
              if (elementIdSet.size === 0) {
                observer.disconnect();
                resolve();
              }
            }
          }
        });
        let mainContent = document.querySelector(".main-content");
        observer.observe(mainContent, {childList: true, subtree: true});
        // Disconnect the mutation observer once there is any user input.
        mainContent.addEventListener("scroll", disconnectMutationObserver);
        window.addEventListener("mousedown", disconnectMutationObserver);
        window.addEventListener("keydown", disconnectMutationObserver);
        function disconnectMutationObserver() {
          mainContent.removeEventListener("scroll", disconnectMutationObserver);
          window.removeEventListener("mousedown", disconnectMutationObserver);
          window.removeEventListener("keydown", disconnectMutationObserver);
          observer.disconnect();
        }
      } else {
        resolve();
      }
    });
  }
}

function scrollAndHighlight(subcategory) {
  let element = document.querySelector(`[data-subcategory="${subcategory}"]`);
  if (element) {
    let header = getClosestDisplayedHeader(element);
    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("caption.search-header");
  if (searchHeader && searchHeader.hidden &&
      header.previousSibling.classList.contains("subcategory")) {
    header = header.previousSibling;
  }
  return header;
}

function scrollContentTo(element) {
  const SEARCH_CONTAINER_HEIGHT = document.querySelector(".search-container").clientHeight;
  let mainContent = document.querySelector(".main-content");
  let top = element.getBoundingClientRect().top - SEARCH_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([
    [aRestartToEnable ?
      "feature-enable-requires-restart" : "feature-disable-requires-restart"],
    ["should-restart-title"],
    ["should-restart-ok"],
    ["revert-no-restart-button"],
    ["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(" "));
}