/* 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/. */

const { PrintUtils, Services, AppConstants } =
  window.docShell.chromeEventHandler.ownerGlobal;

ChromeUtils.defineESModuleGetters(this, {
  DeferredTask: "resource://gre/modules/DeferredTask.sys.mjs",
  DownloadPaths: "resource://gre/modules/DownloadPaths.sys.mjs",
});

const PDF_JS_URI = "resource://pdf.js/web/viewer.html";
const INPUT_DELAY_MS = Cu.isInAutomation ? 100 : 500;
const MM_PER_POINT = 25.4 / 72;
const INCHES_PER_POINT = 1 / 72;
const INCHES_PER_MM = 1 / 25.4;
const ourBrowser = window.docShell.chromeEventHandler;
const PSSVC = Cc["@mozilla.org/gfx/printsettings-service;1"].getService(
  Ci.nsIPrintSettingsService
);

var logger = (function () {
  const getMaxLogLevel = () =>
    Services.prefs.getBoolPref("print.debug", false) ? "all" : "warn";

  let { ConsoleAPI } = ChromeUtils.importESModule(
    "resource://gre/modules/Console.sys.mjs"
  );
  // Create a new instance of the ConsoleAPI so we can control the maxLogLevel with a pref.
  let _logger = new ConsoleAPI({
    prefix: "printUI",
    maxLogLevel: getMaxLogLevel(),
  });

  function onPrefChange() {
    if (_logger) {
      _logger.maxLogLevel = getMaxLogLevel();
    }
  }
  // Watch for pref changes and the maxLogLevel for the logger
  Services.prefs.addObserver("print.debug", onPrefChange);
  window.addEventListener("unload", () => {
    Services.prefs.removeObserver("print.debug", onPrefChange);
  });
  return _logger;
})();

function serializeSettings(settings, logPrefix) {
  let re = /^(k[A-Z]|resolution)/; // accessing settings.resolution throws an exception?
  let types = new Set(["string", "boolean", "number", "undefined"]);
  let nameValues = {};
  for (let key in settings) {
    try {
      if (!re.test(key) && types.has(typeof settings[key])) {
        nameValues[key] = settings[key];
      }
    } catch (e) {
      logger.warn("Exception accessing setting: ", key, e);
    }
  }
  return JSON.stringify(nameValues, null, 2);
}

let printPending = false;
let deferredTasks = [];
function createDeferredTask(fn, timeout) {
  let task = new DeferredTask(fn, timeout);
  deferredTasks.push(task);
  return task;
}

function cancelDeferredTasks() {
  for (let task of deferredTasks) {
    task.disarm();
  }
  PrintEventHandler._updatePrintPreviewTask?.disarm();
  deferredTasks = [];
}

document.addEventListener(
  "DOMContentLoaded",
  e => {
    window._initialized = PrintEventHandler.init().catch(e => console.error(e));
    ourBrowser.setAttribute("flex", "0");
    ourBrowser.setAttribute("constrainpopups", "false");
    ourBrowser.classList.add("printSettingsBrowser");
    ourBrowser.closest(".dialogBox")?.classList.add("printDialogBox");
  },
  { once: true }
);

window.addEventListener("dialogclosing", () => {
  cancelDeferredTasks();
});

window.addEventListener(
  "unload",
  e => {
    document.textContent = "";
  },
  { once: true }
);

var PrintEventHandler = {
  settings: null,
  defaultSettings: null,
  allPaperSizes: {},
  previewIsEmpty: false,
  _delayedChanges: {},
  _userChangedSettings: {},
  settingFlags: {
    margins: Ci.nsIPrintSettings.kInitSaveMargins,
    customMargins: Ci.nsIPrintSettings.kInitSaveMargins,
    orientation: Ci.nsIPrintSettings.kInitSaveOrientation,
    paperId:
      Ci.nsIPrintSettings.kInitSavePaperSize |
      Ci.nsIPrintSettings.kInitSaveUnwriteableMargins,
    printInColor: Ci.nsIPrintSettings.kInitSaveInColor,
    scaling: Ci.nsIPrintSettings.kInitSaveScaling,
    shrinkToFit: Ci.nsIPrintSettings.kInitSaveShrinkToFit,
    printDuplex: Ci.nsIPrintSettings.kInitSaveDuplex,
    printFootersHeaders:
      Ci.nsIPrintSettings.kInitSaveHeaderLeft |
      Ci.nsIPrintSettings.kInitSaveHeaderCenter |
      Ci.nsIPrintSettings.kInitSaveHeaderRight |
      Ci.nsIPrintSettings.kInitSaveFooterLeft |
      Ci.nsIPrintSettings.kInitSaveFooterCenter |
      Ci.nsIPrintSettings.kInitSaveFooterRight,
    printBackgrounds:
      Ci.nsIPrintSettings.kInitSaveBGColors |
      Ci.nsIPrintSettings.kInitSaveBGImages,
  },

  topContentTitle: null,
  topCurrentURI: null,
  activeContentTitle: null,
  activeCurrentURI: null,

  get activeURI() {
    return this.viewSettings.sourceVersion == "selection"
      ? this.activeCurrentURI
      : this.topCurrentURI;
  },
  get activeTitle() {
    return this.viewSettings.sourceVersion == "selection"
      ? this.activeContentTitle
      : this.topContentTitle;
  },

  // These settings do not have an associated pref value or flag, but
  // changing them requires us to update the print preview.
  _nonFlaggedUpdatePreviewSettings: new Set([
    "pageRanges",
    "numPagesPerSheet",
    "sourceVersion",
  ]),
  _noPreviewUpdateSettings: new Set(["numCopies", "printDuplex"]),

  async init() {
    Services.telemetry.scalarAdd("printing.preview_opened_tm", 1);

    this.printPreviewEl =
      ourBrowser.parentElement.querySelector("print-preview");

    // Do not keep a reference to source browser, it may mutate after printing
    // is initiated and the print preview clone must be a snapshot from the
    // time that the print was started.
    let sourceBrowsingContext = this.printPreviewEl.getSourceBrowsingContext();

    let args = window.arguments[0];
    this.printFrameOnly = args.getProperty("printFrameOnly");
    this.printSelectionOnly = args.getProperty("printSelectionOnly");
    this.isArticle = args.getProperty("isArticle");
    this.hasSelection = await PrintUtils.checkForSelection(
      sourceBrowsingContext
    );

    let sourcePrincipal =
      sourceBrowsingContext.currentWindowGlobal.documentPrincipal;
    let sourceIsPdf =
      !sourcePrincipal.isNullPrincipal && sourcePrincipal.spec == PDF_JS_URI;
    this.activeContentTitle =
      sourceBrowsingContext.currentWindowContext.documentTitle;
    this.activeCurrentURI =
      sourceBrowsingContext.currentWindowContext.documentURI.spec;
    let topWindowContext = sourceBrowsingContext.top.currentWindowContext;
    this.topContentTitle = topWindowContext.documentTitle;
    this.topCurrentURI = topWindowContext.documentURI.spec;
    this.isReader = this.topCurrentURI.startsWith("about:reader");

    let canSimplify = !this.isReader && this.isArticle;
    if (!this.hasSelection && !canSimplify) {
      document.getElementById("source-version-section").hidden = true;
    } else {
      document.getElementById("source-version-selection").hidden =
        !this.hasSelection;
      document.getElementById("source-version-simplified").hidden =
        !canSimplify;
    }

    // We don't need the sourceBrowsingContext anymore, get rid of it.
    sourceBrowsingContext = undefined;

    this.printProgressIndicator = document.getElementById("print-progress");
    this.printForm = document.getElementById("print");
    if (sourceIsPdf) {
      this.printForm.removeNonPdfSettings();
    }

    // Let the dialog appear before doing any potential main thread work.
    await ourBrowser._dialogReady;

    // First check the available destinations to ensure we get settings for an
    // accessible printer.
    let destinations,
      defaultSystemPrinter,
      fallbackPaperList,
      selectedPrinter,
      printersByName;
    try {
      ({
        destinations,
        defaultSystemPrinter,
        fallbackPaperList,
        selectedPrinter,
        printersByName,
      } = await this.getPrintDestinations());
    } catch (e) {
      this.reportPrintingError("PRINT_DESTINATIONS");
      throw e;
    }
    PrintSettingsViewProxy.availablePrinters = printersByName;
    PrintSettingsViewProxy.fallbackPaperList = fallbackPaperList;
    PrintSettingsViewProxy.defaultSystemPrinter = defaultSystemPrinter;
    PrintSettingsViewProxy._sourceVersion =
      this.hasSelection && this.printSelectionOnly ? "selection" : "source";

    logger.debug("availablePrinters: ", Object.keys(printersByName));
    logger.debug("defaultSystemPrinter: ", defaultSystemPrinter);

    document.addEventListener("print", async () => {
      let cancelButton = document.getElementById("cancel-button");
      document.l10n.setAttributes(
        cancelButton,
        cancelButton.dataset.closeL10nId
      );
      let didPrint = await this.print();
      if (!didPrint) {
        // Re-enable elements of the form if the user cancels saving or
        // if a deferred task rendered the page invalid.
        this.printForm.enable();
      }
      // Reset the cancel button regardless of the outcome.
      document.l10n.setAttributes(
        cancelButton,
        cancelButton.dataset.cancelL10nId
      );
    });
    this._createDelayedSettingsChangeTask();
    document.addEventListener("update-print-settings", e => {
      this.handleSettingsChange(e.detail);
    });
    document.addEventListener("cancel-print-settings", e => {
      this._delayedSettingsChangeTask.disarm();
      for (let setting of Object.keys(e.detail)) {
        delete this._delayedChanges[setting];
      }
    });
    document.addEventListener("cancel-print", () => this.cancelPrint());
    document.addEventListener("open-system-dialog", async () => {
      // This file in only used if pref print.always_print_silent is false, so
      // no need to check that here.

      // Hide the dialog box before opening system dialog
      // We cannot close the window yet because the browsing context for the
      // print preview browser is needed to print the page.
      let sourceBrowser =
        this.printPreviewEl.getSourceBrowsingContext().top.embedderElement;
      let dialogBoxManager =
        PrintUtils.getTabDialogBox(sourceBrowser).getTabDialogManager();
      dialogBoxManager.hideDialog(sourceBrowser);

      // Use our settings to prepopulate the system dialog.
      // The system print dialog won't recognize our internal save-to-pdf
      // pseudo-printer.  We need to pass it a settings object from any
      // system recognized printer.
      let settings =
        this.settings.printerName == PrintUtils.SAVE_TO_PDF_PRINTER
          ? PrintUtils.getPrintSettings(this.viewSettings.defaultSystemPrinter)
          : this.settings.clone();
      // We set the title so that if the user chooses save-to-PDF from the
      // system dialog the title will be used to generate the prepopulated
      // filename in the file picker.
      settings.title = this.activeTitle;
      Services.telemetry.scalarAdd("printing.dialog_opened_via_preview_tm", 1);
      const doPrint = await this._showPrintDialog(
        window,
        this.hasSelection,
        settings
      );
      if (!doPrint) {
        Services.telemetry.scalarAdd(
          "printing.dialog_via_preview_cancelled_tm",
          1
        );
        window.close();
        return;
      }
      await this.print(settings);
    });

    let originalError;
    const printersByPriority = [
      selectedPrinter.value,
      ...Object.getOwnPropertyNames(printersByName).filter(
        name => name != selectedPrinter.value
      ),
    ];

    // Try to update settings, falling back to any available printer
    for (const printerName of printersByPriority) {
      try {
        let settingsToChange = await this.refreshSettings(printerName);
        await this.updateSettings(settingsToChange, true);
        originalError = null;
        break;
      } catch (e) {
        if (!originalError) {
          originalError = e;
          // Report on how often fetching the last used printer settings fails.
          this.reportPrintingError("PRINTER_SETTINGS_LAST_USED");
        }
      }
    }

    // Only throw original error if no fallback was possible
    if (originalError) {
      this.reportPrintingError("PRINTER_SETTINGS");
      throw originalError;
    }

    let initialPreviewDone = this._updatePrintPreview();

    // Use a DeferredTask for updating the preview. This will ensure that we
    // only have one update running at a time.
    this._createUpdatePrintPreviewTask(initialPreviewDone);

    document.dispatchEvent(
      new CustomEvent("available-destinations", {
        detail: destinations,
      })
    );

    document.dispatchEvent(
      new CustomEvent("print-settings", {
        detail: this.viewSettings,
      })
    );

    document.body.removeAttribute("loading");

    await new Promise(resolve => window.requestAnimationFrame(resolve));

    // Now that we're showing the form, select the destination select.
    document.getElementById("printer-picker").focus({ focusVisible: true });

    await initialPreviewDone;
  },

  async print(systemDialogSettings) {
    // Disable the form when a print is in progress
    this.printForm.disable();

    if (Object.keys(this._delayedChanges).length) {
      // Make sure any pending changes get saved.
      let task = this._delayedSettingsChangeTask;
      this._createDelayedSettingsChangeTask();
      await task.finalize();
    }

    if (this.settings.pageRanges.length) {
      // Finish any running previews to verify the range is still valid.
      let task = this._updatePrintPreviewTask;
      this._createUpdatePrintPreviewTask();
      await task.finalize();
    }

    if (!this.printForm.checkValidity() || this.previewIsEmpty) {
      return false;
    }

    let settings = systemDialogSettings || this.settings;

    if (settings.printerName == PrintUtils.SAVE_TO_PDF_PRINTER) {
      try {
        settings.toFileName = await pickFileName(
          this.activeTitle,
          this.activeURI
        );
      } catch (e) {
        return false;
      }
    }

    await window._initialized;

    // This seems like it should be handled automatically but it isn't.
    PSSVC.maybeSaveLastUsedPrinterNameToPrefs(settings.printerName);

    try {
      // We'll provide our own progress indicator.
      let l10nId =
        settings.printerName == PrintUtils.SAVE_TO_PDF_PRINTER
          ? "printui-print-progress-indicator-saving"
          : "printui-print-progress-indicator";
      document.l10n.setAttributes(this.printProgressIndicator, l10nId);
      this.printProgressIndicator.hidden = false;
      let bc = this.printPreviewEl.currentBrowsingContext;
      await this._doPrint(bc, settings);
    } catch (e) {
      console.error(e);
    }

    if (settings.printerName == PrintUtils.SAVE_TO_PDF_PRINTER) {
      // Clear the file name from the preference value since it may potentially
      // contain sensitive information from the page title (Bug 1675965)
      let prefName =
        "print.printer_" +
        settings.printerName.replace(/ /g, "_") +
        ".print_to_filename";
      Services.prefs.clearUserPref(prefName);
    }

    window.close();
    return true;
  },

  /**
   * Prints the window. This method has been abstracted into a helper for
   * testing purposes.
   */
  _doPrint(aBrowsingContext, aSettings) {
    return aBrowsingContext.print(aSettings);
  },

  cancelPrint() {
    Services.telemetry.scalarAdd("printing.preview_cancelled_tm", 1);
    window.close();
  },

  async refreshSettings(printerName) {
    this.currentPrinterName = printerName;
    let currentPrinter;
    try {
      currentPrinter = await PrintSettingsViewProxy.resolvePropertiesForPrinter(
        printerName
      );
    } catch (e) {
      this.reportPrintingError("PRINTER_PROPERTIES");
      throw e;
    }
    if (this.currentPrinterName != printerName) {
      // Refresh settings could take a while, if the destination has changed
      // then we don't want to update the settings after all.
      return {};
    }

    this.settings = currentPrinter.settings;
    this.defaultSettings = currentPrinter.defaultSettings;

    this.settings.printSelectionOnly = this.printSelectionOnly;

    logger.debug("currentPrinter name: ", printerName);
    logger.debug("settings:", serializeSettings(this.settings));

    // Some settings are only used by the UI
    // assigning new values should update the underlying settings
    this.viewSettings = new Proxy(this.settings, PrintSettingsViewProxy);
    return this.getSettingsToUpdate();
  },

  getSettingsToUpdate() {
    // Get the previously-changed settings we want to try to use on this printer
    let settingsToUpdate = Object.assign({}, this._userChangedSettings);

    // Ensure the color option is correct, if either of the supportsX flags are
    // false then the user cannot change the value through the UI.
    if (!this.viewSettings.supportsColor) {
      settingsToUpdate.printInColor = false;
    } else if (!this.viewSettings.supportsMonochrome) {
      settingsToUpdate.printInColor = true;
    }

    if (settingsToUpdate.sourceVersion == "simplified") {
      if (this.viewSettings.printBackgrounds) {
        // Remember that this was true before so it gets restored if the
        // format is changed to something else.
        this._userChangedSettings.printBackgrounds = true;
      }
      // Backgrounds are removed in simplified mode and this setting changes
      // the output subtly to be less legible.
      settingsToUpdate.printBackgrounds = false;
    }

    if (
      settingsToUpdate.printInColor != this._userChangedSettings.printInColor
    ) {
      delete this._userChangedSettings.printInColor;
    }

    // See if the paperId needs to change.
    let paperId = settingsToUpdate.paperId || this.viewSettings.paperId;

    logger.debug("Using paperId: ", paperId);
    logger.debug(
      "Available paper sizes: ",
      PrintSettingsViewProxy.availablePaperSizes
    );
    let matchedPaper =
      paperId && PrintSettingsViewProxy.availablePaperSizes[paperId];
    if (!matchedPaper) {
      let paperWidth, paperHeight, paperSizeUnit;
      if (settingsToUpdate.paperId) {
        // The user changed paperId in this instance and session,
        // We should have details on the paper size from the previous printer
        paperId = settingsToUpdate.paperId;
        let cachedPaperWrapper = this.allPaperSizes[paperId];
        // for the purposes of finding a best-size match, we'll use mm
        paperWidth = cachedPaperWrapper.paper.width * MM_PER_POINT;
        paperHeight = cachedPaperWrapper.paper.height * MM_PER_POINT;
        paperSizeUnit = PrintEventHandler.settings.kPaperSizeMillimeters;
      } else {
        paperId = this.viewSettings.paperId;
        logger.debug(
          "No paperId or matchedPaper, get a new default from viewSettings:",
          paperId
        );
        paperWidth = this.viewSettings.paperWidth;
        paperHeight = this.viewSettings.paperHeight;
        paperSizeUnit = this.viewSettings.paperSizeUnit;
      }
      matchedPaper = PrintSettingsViewProxy.getBestPaperMatch(
        paperWidth,
        paperHeight,
        paperSizeUnit
      );
    }
    if (!matchedPaper) {
      // We didn't find a good match. Take the first paper size
      matchedPaper = Object.values(
        PrintSettingsViewProxy.availablePaperSizes
      )[0];
      delete this._userChangedSettings.paperId;
    }
    if (matchedPaper.id !== paperId) {
      // The exact paper id doesn't exist for this printer
      logger.log(
        `Requested paperId: "${paperId}" missing on this printer, using: ${matchedPaper.id} instead`
      );
      delete this._userChangedSettings.paperId;
    }
    // Always write paper details back to settings
    settingsToUpdate.paperId = matchedPaper.id;

    return settingsToUpdate;
  },

  _createDelayedSettingsChangeTask() {
    this._delayedSettingsChangeTask = createDeferredTask(async () => {
      if (Object.keys(this._delayedChanges).length) {
        let changes = this._delayedChanges;
        this._delayedChanges = {};
        await this.onUserSettingsChange(changes);
      }
    }, INPUT_DELAY_MS);
  },

  _createUpdatePrintPreviewTask(initialPreviewDone = null) {
    this._updatePrintPreviewTask = new DeferredTask(async () => {
      await initialPreviewDone;
      await this._updatePrintPreview();
      document.dispatchEvent(new CustomEvent("preview-updated"));
    }, 0);
  },

  _scheduleDelayedSettingsChange(changes) {
    Object.assign(this._delayedChanges, changes);
    this._delayedSettingsChangeTask.disarm();
    this._delayedSettingsChangeTask.arm();
  },

  handleSettingsChange(changedSettings = {}) {
    let delayedChanges = {};
    let instantChanges = {};
    for (let [setting, value] of Object.entries(changedSettings)) {
      switch (setting) {
        case "pageRanges":
        case "scaling":
          delayedChanges[setting] = value;
          break;
        case "customMargins":
          delete this._delayedChanges.margins;
          changedSettings.margins == "custom"
            ? (delayedChanges[setting] = value)
            : (instantChanges[setting] = value);
          break;
        default:
          instantChanges[setting] = value;
          break;
      }
    }
    if (Object.keys(delayedChanges).length) {
      this._scheduleDelayedSettingsChange(delayedChanges);
    }
    if (Object.keys(instantChanges).length) {
      this.onUserSettingsChange(instantChanges);
    }
  },

  async onUserSettingsChange(changedSettings = {}) {
    let previewableChange = false;
    for (let [setting, value] of Object.entries(changedSettings)) {
      Services.telemetry.keyedScalarAdd(
        "printing.settings_changed",
        setting,
        1
      );
      // Update the list of user-changed settings, which we attempt to maintain
      // across printer changes.
      this._userChangedSettings[setting] = value;
      if (!this._noPreviewUpdateSettings.has(setting)) {
        previewableChange = true;
      }
    }
    if (changedSettings.printerName) {
      logger.debug(
        "onUserSettingsChange, changing to printerName:",
        changedSettings.printerName
      );
      this.printForm.printerChanging = true;
      this.printForm.disable(el => el.id != "printer-picker");
      let { printerName } = changedSettings;
      // Treat a printerName change separately, because it involves a settings
      // object switch and we don't want to set the new name on the old settings.
      changedSettings = await this.refreshSettings(printerName);
      if (printerName != this.currentPrinterName) {
        // Don't continue this update if the printer changed again.
        return;
      }
      this.printForm.printerChanging = false;
      this.printForm.enable();
    } else {
      changedSettings = this.getSettingsToUpdate();
    }

    let shouldPreviewUpdate =
      (await this.updateSettings(
        changedSettings,
        !!changedSettings.printerName
      )) && previewableChange;

    if (shouldPreviewUpdate && !printPending) {
      // We do not need to arm the preview task if the user has already printed
      // and finalized any deferred tasks.
      this.updatePrintPreview();
    }
    document.dispatchEvent(
      new CustomEvent("print-settings", {
        detail: this.viewSettings,
      })
    );
  },

  async updateSettings(changedSettings = {}, printerChanged = false) {
    let updatePreviewWithoutFlag = false;
    let flags = 0;
    logger.debug("updateSettings ", changedSettings, printerChanged);

    if (printerChanged || changedSettings.paperId) {
      // The paper's margin properties are async,
      // so resolve those now before we update the settings
      try {
        let paperWrapper = await PrintSettingsViewProxy.fetchPaperMargins(
          changedSettings.paperId || this.viewSettings.paperId
        );

        // See if we also need to change the custom margin values

        let paperHeightInInches = paperWrapper.paper.height * INCHES_PER_POINT;
        let paperWidthInInches = paperWrapper.paper.width * INCHES_PER_POINT;
        let height =
          (changedSettings.orientation || this.viewSettings.orientation) == 0
            ? paperHeightInInches
            : paperWidthInInches;
        let width =
          (changedSettings.orientation || this.viewSettings.orientation) == 0
            ? paperWidthInInches
            : paperHeightInInches;

        function verticalMarginsInvalid(margins) {
          return (
            parseFloat(margins.marginTop) + parseFloat(margins.marginBottom) >
            height -
              paperWrapper.unwriteableMarginTop -
              paperWrapper.unwriteableMarginBottom
          );
        }

        function horizontalMarginsInvalid(margins) {
          return (
            parseFloat(margins.marginRight) + parseFloat(margins.marginLeft) >
            width -
              paperWrapper.unwriteableMarginRight -
              paperWrapper.unwriteableMarginLeft
          );
        }

        let unwriteableMarginsInvalid = false;
        if (
          verticalMarginsInvalid(this.viewSettings.customMargins) ||
          this.viewSettings.customMargins.marginTop < 0 ||
          this.viewSettings.customMargins.marginBottom < 0
        ) {
          let { marginTop, marginBottom } = this.viewSettings.defaultMargins;
          if (verticalMarginsInvalid(this.viewSettings.defaultMargins)) {
            let marginsNone = this.getMarginPresets("none");
            marginTop = marginsNone.marginTop;
            marginBottom = marginsNone.marginBottom;
            unwriteableMarginsInvalid = true;
          }
          changedSettings.marginTop = changedSettings.customMarginTop =
            marginTop;
          changedSettings.marginBottom = changedSettings.customMarginBottom =
            marginBottom;
          delete this._userChangedSettings.customMargins;
        }

        if (
          horizontalMarginsInvalid(this.viewSettings.customMargins) ||
          this.viewSettings.customMargins.marginLeft < 0 ||
          this.viewSettings.customMargins.marginRight < 0
        ) {
          let { marginLeft, marginRight } = this.viewSettings.defaultMargins;
          if (horizontalMarginsInvalid(this.viewSettings.defaultMargins)) {
            let marginsNone = this.getMarginPresets("none");
            marginLeft = marginsNone.marginLeft;
            marginRight = marginsNone.marginRight;
            unwriteableMarginsInvalid = true;
          }
          changedSettings.marginLeft = changedSettings.customMarginLeft =
            marginLeft;
          changedSettings.marginRight = changedSettings.customMarginRight =
            marginRight;
          delete this._userChangedSettings.customMargins;
        }

        if (unwriteableMarginsInvalid) {
          changedSettings.ignoreUnwriteableMargins = true;
        }
      } catch (e) {
        this.reportPrintingError("PAPER_MARGINS");
        throw e;
      }
    }

    for (let [setting, value] of Object.entries(changedSettings)) {
      // Always write paper changes back to settings as pref-derived values could be bad
      if (
        this.viewSettings[setting] != value ||
        (printerChanged && setting == "paperId")
      ) {
        if (setting == "pageRanges") {
          // The page range is kept as an array. If the user switches between all
          // and custom with no specified range input (which is represented as an
          // empty array), we do not want to send an update.
          if (!this.viewSettings[setting].length && !value.length) {
            continue;
          }
        }
        this.viewSettings[setting] = value;

        if (
          setting in this.settingFlags &&
          setting in this._userChangedSettings
        ) {
          flags |= this.settingFlags[setting];
        }
        updatePreviewWithoutFlag |=
          this._nonFlaggedUpdatePreviewSettings.has(setting);
      }
    }

    let shouldPreviewUpdate =
      flags || printerChanged || updatePreviewWithoutFlag;
    logger.debug(
      "updateSettings, calculated flags:",
      flags,
      "shouldPreviewUpdate:",
      shouldPreviewUpdate
    );
    if (flags) {
      this.saveSettingsToPrefs(flags);
    }
    return shouldPreviewUpdate;
  },

  saveSettingsToPrefs(flags) {
    PSSVC.maybeSavePrintSettingsToPrefs(this.settings, flags);
  },

  /**
   * Queue a task to update the print preview. It will start immediately or when
   * the in progress update completes.
   */
  async updatePrintPreview() {
    // Make sure the rendering state is set so we don't visibly update the
    // sheet count with incomplete data.
    this._updatePrintPreviewTask.arm();
  },

  /**
   * Creates a print preview or refreshes the preview with new settings when omitted.
   *
   * @return {Promise} Resolves when the preview has been updated.
   */
  async _updatePrintPreview() {
    let { settings } = this;

    const isFirstCall = !this.printInitiationTime;
    if (isFirstCall) {
      let params = new URLSearchParams(location.search);
      this.printInitiationTime = parseInt(
        params.get("printInitiationTime"),
        10
      );
      const elapsed = Date.now() - this.printInitiationTime;
      Services.telemetry
        .getHistogramById("PRINT_INIT_TO_PLATFORM_SENT_SETTINGS_MS")
        .add(elapsed);
    }

    let totalPageCount, sheetCount, isEmpty, orientation, pageWidth, pageHeight;
    try {
      // This resolves with a PrintPreviewSuccessInfo dictionary.
      let { sourceVersion } = this.viewSettings;
      let sourceURI = this.activeURI;
      this._lastPrintPreviewSettings = settings;
      ({
        totalPageCount,
        sheetCount,
        isEmpty,
        orientation,
        pageWidth,
        pageHeight,
      } = await this.printPreviewEl.printPreview(settings, {
        sourceVersion,
        sourceURI,
      }));
    } catch (e) {
      this.reportPrintingError("PRINT_PREVIEW");
      console.error(e);
      throw e;
    }

    // If there is a set orientation, update the settings to use it. In this
    // case, the document will already have used this orientation to create
    // the print preview.
    if (orientation != "unspecified") {
      const kIPrintSettings = Ci.nsIPrintSettings;
      settings.orientation =
        orientation == "landscape"
          ? kIPrintSettings.kLandscapeOrientation
          : kIPrintSettings.kPortraitOrientation;
      document.dispatchEvent(new CustomEvent("hide-orientation"));
    }

    // If the page size is set, check whether we should use it as our paper size.
    let isUsingPageRuleSizeAsPaperSize =
      settings.usePageRuleSizeAsPaperSize &&
      pageWidth !== null &&
      pageHeight !== null;
    if (isUsingPageRuleSizeAsPaperSize) {
      // We canonically represent paper sizes using the width/height of a portrait-oriented sheet,
      // with landscape-orientation applied as a supplemental rotation.
      // If the page-size is landscape oriented, we flip the pageWidth / pageHeight here
      // in order to pass a canonical representation into the paper-size settings.
      if (orientation == "landscape") {
        [pageHeight, pageWidth] = [pageWidth, pageHeight];
      }

      let matchedPaper = PrintSettingsViewProxy.getBestPaperMatch(
        pageWidth,
        pageHeight,
        settings.kPaperSizeInches
      );
      if (matchedPaper) {
        settings.paperId = matchedPaper.id;
      }

      settings.paperWidth = pageWidth;
      settings.paperHeight = pageHeight;
      settings.paperSizeUnit = settings.kPaperSizeInches;
      document.dispatchEvent(new CustomEvent("hide-paper-size"));
    }

    this.previewIsEmpty = isEmpty;
    // If the preview is empty, we know our range is greater than the number of pages.
    // We have to send a pageRange update to display a non-empty page.
    if (this.previewIsEmpty) {
      this.viewSettings.pageRanges = [];
      this.updatePrintPreview();
    }

    document.dispatchEvent(
      new CustomEvent("page-count", {
        detail: { sheetCount, totalPages: totalPageCount },
      })
    );

    if (isFirstCall) {
      const elapsed = Date.now() - this.printInitiationTime;
      Services.telemetry
        .getHistogramById("PRINT_INIT_TO_PREVIEW_DOC_SHOWN_MS")
        .add(elapsed);
    }
  },

  async getPrintDestinations() {
    const printerList = Cc["@mozilla.org/gfx/printerlist;1"].createInstance(
      Ci.nsIPrinterList
    );
    let printers;

    if (Cu.isInAutomation) {
      printers = window._mockPrinters || [];
    } else {
      try {
        printers = await printerList.printers;
      } catch (e) {
        this.reportPrintingError("PRINTER_LIST");
        throw e;
      }
    }

    let fallbackPaperList;
    try {
      fallbackPaperList = await printerList.fallbackPaperList;
    } catch (e) {
      this.reportPrintingError("FALLBACK_PAPER_LIST");
      throw e;
    }

    let lastUsedPrinterName;
    try {
      lastUsedPrinterName = PSSVC.lastUsedPrinterName;
    } catch (e) {
      this.reportPrintingError("LAST_USED_PRINTER");
      throw e;
    }
    const defaultPrinterName = printerList.systemDefaultPrinterName;
    const printersByName = {};

    let lastUsedPrinter;
    let defaultSystemPrinter;

    let saveToPdfPrinter = {
      nameId: "printui-destination-pdf-label",
      value: PrintUtils.SAVE_TO_PDF_PRINTER,
    };
    printersByName[PrintUtils.SAVE_TO_PDF_PRINTER] = {
      supportsColor: true,
      supportsMonochrome: false,
      name: PrintUtils.SAVE_TO_PDF_PRINTER,
    };

    if (lastUsedPrinterName == PrintUtils.SAVE_TO_PDF_PRINTER) {
      lastUsedPrinter = saveToPdfPrinter;
    }

    let destinations = [
      saveToPdfPrinter,
      ...printers.map(printer => {
        printer.QueryInterface(Ci.nsIPrinter);
        const { name } = printer;
        printersByName[printer.name] = { printer };
        const destination = { name, value: name };

        if (name == lastUsedPrinterName) {
          lastUsedPrinter = destination;
        }
        if (name == defaultPrinterName) {
          defaultSystemPrinter = destination;
        }

        return destination;
      }),
    ];

    let selectedPrinter =
      lastUsedPrinter || defaultSystemPrinter || saveToPdfPrinter;

    return {
      destinations,
      fallbackPaperList,
      selectedPrinter,
      printersByName,
      defaultSystemPrinter,
    };
  },

  getMarginPresets(marginSize, paperWrapper) {
    switch (marginSize) {
      case "minimum": {
        let marginSource = paperWrapper || this.defaultSettings;
        return {
          marginTop: marginSource.unwriteableMarginTop,
          marginRight: marginSource.unwriteableMarginRight,
          marginBottom: marginSource.unwriteableMarginBottom,
          marginLeft: marginSource.unwriteableMarginLeft,
        };
      }
      case "none":
        return {
          marginTop: 0,
          marginLeft: 0,
          marginBottom: 0,
          marginRight: 0,
        };
      case "custom":
        return {
          marginTop:
            PrintSettingsViewProxy._lastCustomMarginValues.marginTop ??
            this.settings.marginTop,
          marginBottom:
            PrintSettingsViewProxy._lastCustomMarginValues.marginBottom ??
            this.settings.marginBottom,
          marginLeft:
            PrintSettingsViewProxy._lastCustomMarginValues.marginLeft ??
            this.settings.marginLeft,
          marginRight:
            PrintSettingsViewProxy._lastCustomMarginValues.marginRight ??
            this.settings.marginRight,
        };
      default: {
        let minimum = this.getMarginPresets("minimum", paperWrapper);
        return {
          marginTop: !isNaN(minimum.marginTop)
            ? Math.max(minimum.marginTop, this.defaultSettings.marginTop)
            : this.defaultSettings.marginTop,
          marginRight: !isNaN(minimum.marginRight)
            ? Math.max(minimum.marginRight, this.defaultSettings.marginRight)
            : this.defaultSettings.marginRight,
          marginBottom: !isNaN(minimum.marginBottom)
            ? Math.max(minimum.marginBottom, this.defaultSettings.marginBottom)
            : this.defaultSettings.marginBottom,
          marginLeft: !isNaN(minimum.marginLeft)
            ? Math.max(minimum.marginLeft, this.defaultSettings.marginLeft)
            : this.defaultSettings.marginLeft,
        };
      }
    }
  },

  reportPrintingError(aMessage) {
    logger.debug("reportPrintingError:", aMessage);
    Services.telemetry.keyedScalarAdd("printing.error", aMessage, 1);
  },

  /**
   * Shows the system dialog. This method has been abstracted into a helper for
   * testing purposes. The showPrintDialog() call blocks until the dialog is
   * closed, so we mark it as async to allow us to reject from the test.
   */
  async _showPrintDialog(aWindow, aHaveSelection, aSettings) {
    return PrintUtils.handleSystemPrintDialog(
      aWindow,
      aHaveSelection,
      aSettings
    );
  },
};

var PrintSettingsViewProxy = {
  get defaultHeadersAndFooterValues() {
    const defaultBranch = Services.prefs.getDefaultBranch("");
    let settingValues = {};
    for (let [name, pref] of Object.entries(this.headerFooterSettingsPrefs)) {
      settingValues[name] = defaultBranch.getStringPref(pref);
    }
    // We only need to retrieve these defaults once and they will not change
    Object.defineProperty(this, "defaultHeadersAndFooterValues", {
      value: settingValues,
    });
    return settingValues;
  },

  headerFooterSettingsPrefs: {
    footerStrCenter: "print.print_footercenter",
    footerStrLeft: "print.print_footerleft",
    footerStrRight: "print.print_footerright",
    headerStrCenter: "print.print_headercenter",
    headerStrLeft: "print.print_headerleft",
    headerStrRight: "print.print_headerright",
  },

  // Custom margins are not saved by a pref, so we need to keep track of them
  // in order to save the value.
  _lastCustomMarginValues: {
    marginTop: null,
    marginBottom: null,
    marginLeft: null,
    marginRight: null,
  },

  // This list was taken from nsDeviceContextSpecWin.cpp which records telemetry on print target type
  knownSaveToFilePrinters: new Set([
    "Microsoft Print to PDF",
    "Adobe PDF",
    "Bullzip PDF Printer",
    "CutePDF Writer",
    "doPDF",
    "Foxit Reader PDF Printer",
    "Nitro PDF Creator",
    "novaPDF",
    "PDF-XChange",
    "PDF24 PDF",
    "PDFCreator",
    "PrimoPDF",
    "Soda PDF",
    "Solid PDF Creator",
    "Universal Document Converter",
    "Microsoft XPS Document Writer",
  ]),

  getBestPaperMatch(paperWidth, paperHeight, paperSizeUnit) {
    let paperSizes = Object.values(this.availablePaperSizes);
    if (!(paperWidth && paperHeight)) {
      return null;
    }
    // first try to match on the paper dimensions using the current units
    let unitsPerPoint;
    let altUnitsPerPoint;
    if (paperSizeUnit == PrintEventHandler.settings.kPaperSizeMillimeters) {
      unitsPerPoint = MM_PER_POINT;
      altUnitsPerPoint = INCHES_PER_POINT;
    } else {
      unitsPerPoint = INCHES_PER_POINT;
      altUnitsPerPoint = MM_PER_POINT;
    }
    // equality to 1pt.
    const equal = (a, b) => Math.abs(a - b) < 1;
    const findMatch = (widthPts, heightPts) =>
      paperSizes.find(paperWrapper => {
        // the dimensions on the nsIPaper object are in points
        let result =
          equal(widthPts, paperWrapper.paper.width) &&
          equal(heightPts, paperWrapper.paper.height);
        return result;
      });
    // Look for a paper with matching dimensions, using the current printer's
    // paper size unit, then the alternate unit
    let matchedPaper =
      findMatch(paperWidth / unitsPerPoint, paperHeight / unitsPerPoint) ||
      findMatch(paperWidth / altUnitsPerPoint, paperHeight / altUnitsPerPoint);

    if (matchedPaper) {
      return matchedPaper;
    }
    return null;
  },

  async fetchPaperMargins(paperId) {
    // resolve any async and computed properties we need on the paper
    let paperWrapper = this.availablePaperSizes[paperId];
    if (!paperWrapper) {
      throw new Error("Can't fetchPaperMargins: " + paperId);
    }
    if (paperWrapper._resolved) {
      // We've already resolved and calculated these values
      return paperWrapper;
    }
    let margins;
    try {
      margins = await paperWrapper.paper.unwriteableMargin;
    } catch (e) {
      this.reportPrintingError("UNWRITEABLE_MARGIN");
      throw e;
    }
    margins.QueryInterface(Ci.nsIPaperMargin);

    // margin dimensions are given on the paper in points, setting values need to be in inches
    paperWrapper.unwriteableMarginTop = margins.top * INCHES_PER_POINT;
    paperWrapper.unwriteableMarginRight = margins.right * INCHES_PER_POINT;
    paperWrapper.unwriteableMarginBottom = margins.bottom * INCHES_PER_POINT;
    paperWrapper.unwriteableMarginLeft = margins.left * INCHES_PER_POINT;
    // No need to re-resolve static properties
    paperWrapper._resolved = true;
    return paperWrapper;
  },

  async resolvePropertiesForPrinter(printerName) {
    // resolve any async properties we need on the printer
    let printerInfo = this.availablePrinters[printerName];
    if (printerInfo._resolved) {
      // Store a convenience reference
      this.availablePaperSizes = printerInfo.availablePaperSizes;
      return printerInfo;
    }

    // Await the async printer data.
    if (printerInfo.printer) {
      let basePrinterInfo;
      try {
        [
          printerInfo.supportsDuplex,
          printerInfo.supportsColor,
          printerInfo.supportsMonochrome,
          basePrinterInfo,
        ] = await Promise.all([
          printerInfo.printer.supportsDuplex,
          printerInfo.printer.supportsColor,
          printerInfo.printer.supportsMonochrome,
          printerInfo.printer.printerInfo,
        ]);
      } catch (e) {
        this.reportPrintingError("PRINTER_SETTINGS");
        throw e;
      }
      basePrinterInfo.QueryInterface(Ci.nsIPrinterInfo);
      basePrinterInfo.defaultSettings.QueryInterface(Ci.nsIPrintSettings);

      printerInfo.paperList = basePrinterInfo.paperList;
      printerInfo.defaultSettings = basePrinterInfo.defaultSettings;
    } else if (printerName == PrintUtils.SAVE_TO_PDF_PRINTER) {
      // The Mozilla PDF pseudo-printer has no actual nsIPrinter implementation
      printerInfo.defaultSettings = PSSVC.createNewPrintSettings();
      printerInfo.defaultSettings.printerName = printerName;
      printerInfo.defaultSettings.toFileName = "";
      printerInfo.defaultSettings.outputFormat =
        Ci.nsIPrintSettings.kOutputFormatPDF;
      printerInfo.defaultSettings.outputDestination =
        Ci.nsIPrintSettings.kOutputDestinationFile;
      printerInfo.defaultSettings.usePageRuleSizeAsPaperSize =
        Services.prefs.getBoolPref(
          "print.save_as_pdf.use_page_rule_size_as_paper_size.enabled",
          false
        );
      printerInfo.paperList = this.fallbackPaperList;
    }
    printerInfo.settings = printerInfo.defaultSettings.clone();
    // Apply any previously persisted user values
    // Don't apply kInitSavePrintToFile though, that should only be true for
    // the PDF printer.
    printerInfo.settings.outputDestination =
      printerName == PrintUtils.SAVE_TO_PDF_PRINTER
        ? Ci.nsIPrintSettings.kOutputDestinationFile
        : Ci.nsIPrintSettings.kOutputDestinationPrinter;
    let flags =
      printerInfo.settings.kInitSaveAll ^
      printerInfo.settings.kInitSavePrintToFile;
    PSSVC.initPrintSettingsFromPrefs(printerInfo.settings, true, flags);
    // We set `isInitializedFromPrinter` to make sure that that's set on the
    // SAVE_TO_PDF_PRINTER settings.  The naming is poor, but that tells the
    // platform code that the settings object is complete.
    printerInfo.settings.isInitializedFromPrinter = true;

    printerInfo.settings.toFileName = "";

    // prepare the available paper sizes for this printer
    if (!printerInfo.paperList?.length) {
      logger.warn(
        "Printer has empty paperList: ",
        printerInfo.printer.id,
        "using fallbackPaperList"
      );
      printerInfo.paperList = this.fallbackPaperList;
    }
    // don't trust the settings to provide valid paperSizeUnit values
    let sizeUnit =
      printerInfo.settings.paperSizeUnit ==
      printerInfo.settings.kPaperSizeMillimeters
        ? printerInfo.settings.kPaperSizeMillimeters
        : printerInfo.settings.kPaperSizeInches;
    let papersById = (printerInfo.availablePaperSizes = {});
    // Store a convenience reference
    this.availablePaperSizes = papersById;

    for (let paper of printerInfo.paperList) {
      paper.QueryInterface(Ci.nsIPaper);
      // Bug 1662239: I'm seeing multiple duplicate entries for each paper size
      // so ensure we have one entry per name
      if (!papersById[paper.id]) {
        papersById[paper.id] = {
          paper,
          id: paper.id,
          name: paper.name,
          // XXXsfoster: Eventually we want to get the unit from the nsIPaper object
          sizeUnit,
        };
      }
    }
    // Update our cache of all the paper sizes by name
    Object.assign(PrintEventHandler.allPaperSizes, papersById);

    // The printer properties don't change, mark this as resolved for next time
    printerInfo._resolved = true;
    logger.debug("Resolved printerInfo:", printerInfo);
    return printerInfo;
  },

  get(target, name) {
    switch (name) {
      case "currentPaper": {
        let paperId = this.get(target, "paperId");
        return paperId && this.availablePaperSizes[paperId];
      }

      case "marginPresets":
        let paperWrapper = this.get(target, "currentPaper");
        return {
          none: PrintEventHandler.getMarginPresets("none", paperWrapper),
          minimum: PrintEventHandler.getMarginPresets("minimum", paperWrapper),
          default: PrintEventHandler.getMarginPresets("default", paperWrapper),
          custom: PrintEventHandler.getMarginPresets("custom", paperWrapper),
        };

      case "marginOptions": {
        let allMarginPresets = this.get(target, "marginPresets");
        let uniqueMargins = new Set();
        let marginsEnabled = {};
        for (let name of ["none", "default", "minimum", "custom"]) {
          let { marginTop, marginLeft, marginBottom, marginRight } =
            allMarginPresets[name];
          let key = [marginTop, marginLeft, marginBottom, marginRight].join(
            ","
          );
          // Custom margins are initialized to default margins
          marginsEnabled[name] = !uniqueMargins.has(key) || name == "custom";
          uniqueMargins.add(key);
        }
        return marginsEnabled;
      }

      case "margins":
        let marginSettings = {
          marginTop: target.marginTop,
          marginLeft: target.marginLeft,
          marginBottom: target.marginBottom,
          marginRight: target.marginRight,
        };
        // see if they match the none, minimum, or default margin values
        let allMarginPresets = this.get(target, "marginPresets");
        const marginsMatch = function (lhs, rhs) {
          return Object.keys(marginSettings).every(
            name => lhs[name].toFixed(2) == rhs[name].toFixed(2)
          );
        };
        const potentialPresets = (function () {
          let presets = [];
          const minimumIsNone = marginsMatch(
            allMarginPresets.none,
            allMarginPresets.minimum
          );
          // We only attempt to match the serialized values against the "none"
          // preset if the unwriteable margins are being ignored or are zero.
          if (target.ignoreUnwriteableMargins || minimumIsNone) {
            presets.push("none");
          }
          if (!minimumIsNone) {
            presets.push("minimum");
          }
          presets.push("default");
          return presets;
        })();
        for (let presetName of potentialPresets) {
          let marginPresets = allMarginPresets[presetName];
          if (marginsMatch(marginSettings, marginPresets)) {
            return presetName;
          }
        }

        // Fall back to custom for other values
        return "custom";

      case "defaultMargins":
        return PrintEventHandler.getMarginPresets(
          "default",
          this.get(target, "currentPaper")
        );

      case "customMargins":
        return PrintEventHandler.getMarginPresets(
          "custom",
          this.get(target, "currentPaper")
        );

      case "paperSizes":
        return Object.values(this.availablePaperSizes)
          .sort((a, b) => a.name.localeCompare(b.name))
          .map(paper => {
            return {
              name: paper.name,
              value: paper.id,
            };
          });

      case "supportsDuplex":
        return this.availablePrinters[target.printerName].supportsDuplex;

      case "printDuplex":
        switch (target.duplex) {
          case Ci.nsIPrintSettings.kDuplexNone:
            break;
          case Ci.nsIPrintSettings.kDuplexFlipOnLongEdge:
            return "long-edge";
          case Ci.nsIPrintSettings.kDuplexFlipOnShortEdge:
            return "short-edge";
          default:
            logger.warn("Unexpected duplex value: ", target.duplex);
        }
        return "off";
      case "printBackgrounds":
        return target.printBGImages || target.printBGColors;

      case "printFootersHeaders":
        // if any of the footer and headers settings have a non-empty string value
        // we consider that "enabled"
        return Object.keys(this.headerFooterSettingsPrefs).some(
          name => !!target[name]
        );

      case "supportsColor":
        return this.availablePrinters[target.printerName].supportsColor;

      case "willSaveToFile":
        return (
          target.outputFormat == Ci.nsIPrintSettings.kOutputFormatPDF ||
          this.knownSaveToFilePrinters.has(target.printerName)
        );
      case "supportsMonochrome":
        return this.availablePrinters[target.printerName].supportsMonochrome;
      case "defaultSystemPrinter":
        return (
          this.defaultSystemPrinter?.value ||
          Object.getOwnPropertyNames(this.availablePrinters).find(
            name => name != PrintUtils.SAVE_TO_PDF_PRINTER
          )
        );

      case "numCopies":
        return this.get(target, "willSaveToFile") ? 1 : target.numCopies;
      case "sourceVersion":
        return this._sourceVersion;
    }
    return target[name];
  },

  set(target, name, value) {
    switch (name) {
      case "margins":
        if (!["default", "minimum", "none", "custom"].includes(value)) {
          logger.warn("Unexpected margin preset name: ", value);
          value = "default";
        }
        let paperWrapper = this.get(target, "currentPaper");
        let marginPresets = PrintEventHandler.getMarginPresets(
          value,
          paperWrapper
        );
        for (let [settingName, presetValue] of Object.entries(marginPresets)) {
          target[settingName] = presetValue;
        }
        target.honorPageRuleMargins = value == "default";
        target.ignoreUnwriteableMargins = value == "none";
        break;

      case "paperId": {
        let paperId = value;
        let paperWrapper = this.availablePaperSizes[paperId];
        // Dimensions on the paper object are in pts.
        // We convert to the printer's specified unit when updating settings
        let unitsPerPoint =
          paperWrapper.sizeUnit == target.kPaperSizeMillimeters
            ? MM_PER_POINT
            : INCHES_PER_POINT;
        // paperWidth and paperHeight are calculated values that we always treat as suspect and
        // re-calculate whenever the paperId changes
        target.paperSizeUnit = paperWrapper.sizeUnit;
        target.paperWidth = paperWrapper.paper.width * unitsPerPoint;
        target.paperHeight = paperWrapper.paper.height * unitsPerPoint;
        // Unwriteable margins were pre-calculated from their async values when the paper size
        // was selected. They are always in inches
        target.unwriteableMarginTop = paperWrapper.unwriteableMarginTop;
        target.unwriteableMarginRight = paperWrapper.unwriteableMarginRight;
        target.unwriteableMarginBottom = paperWrapper.unwriteableMarginBottom;
        target.unwriteableMarginLeft = paperWrapper.unwriteableMarginLeft;
        target.paperId = paperWrapper.paper.id;
        // pull new margin values for the new paper size
        this.set(target, "margins", this.get(target, "margins"));
        break;
      }

      case "printerName":
        // Can't set printerName, settings objects belong to a specific printer.
        break;

      case "printBackgrounds":
        target.printBGImages = value;
        target.printBGColors = value;
        break;

      case "printDuplex": {
        let duplex = (function () {
          switch (value) {
            case "off":
              break;
            case "long-edge":
              return Ci.nsIPrintSettings.kDuplexFlipOnLongEdge;
            case "short-edge":
              return Ci.nsIPrintSettings.kDuplexFlipOnShortEdge;
            default:
              logger.warn("Unexpected duplex name: ", value);
          }
          return Ci.nsIPrintSettings.kDuplexNone;
        })();

        target.duplex = duplex;
        break;
      }

      case "printFootersHeaders":
        // To disable header & footers, set them all to empty.
        // To enable, restore default values for each of the header & footer settings.
        for (let [settingName, defaultValue] of Object.entries(
          this.defaultHeadersAndFooterValues
        )) {
          target[settingName] = value ? defaultValue : "";
        }
        break;

      case "customMargins":
        if (value != null) {
          for (let [settingName, newVal] of Object.entries(value)) {
            target[settingName] = newVal;
            this._lastCustomMarginValues[settingName] = newVal;
          }
        }
        break;

      case "customMarginTop":
      case "customMarginBottom":
      case "customMarginLeft":
      case "customMarginRight":
        let customMarginName = "margin" + name.substring(12);
        this.set(
          target,
          "customMargins",
          Object.assign({}, this.get(target, "customMargins"), {
            [customMarginName]: value,
          })
        );
        break;

      case "sourceVersion":
        this._sourceVersion = value;
        this.set(target, "printSelectionOnly", value == "selection");
        if (value == "simplified") {
          this.set(target, "printBackgrounds", false);
        }
        break;

      default:
        target[name] = value;
    }
  },
};

/*
 * Custom elements ----------------------------------------------------
 */

function PrintUIControlMixin(superClass) {
  return class PrintUIControl extends superClass {
    connectedCallback() {
      this.setAttribute("autocomplete", "off");
      this.initialize();
      this.render();
    }

    initialize() {
      if (this._initialized) {
        return;
      }
      this._initialized = true;
      if (this.templateId) {
        let template = this.ownerDocument.getElementById(this.templateId);
        let templateContent = template.content;
        this.appendChild(templateContent.cloneNode(true));
      }

      document.addEventListener("print-settings", ({ detail: settings }) => {
        this.update(settings);
      });

      this.addEventListener("input", this);
    }

    render() {}

    update(settings) {}

    dispatchSettingsChange(changedSettings) {
      this.dispatchEvent(
        new CustomEvent("update-print-settings", {
          bubbles: true,
          detail: changedSettings,
        })
      );
    }

    cancelSettingsChange(changedSettings) {
      this.dispatchEvent(
        new CustomEvent("cancel-print-settings", {
          bubbles: true,
          detail: changedSettings,
        })
      );
    }

    handleEvent(event) {}
  };
}

class PrintUIForm extends PrintUIControlMixin(HTMLFormElement) {
  initialize() {
    super.initialize();

    this.addEventListener("submit", this);
    this.addEventListener("click", this);
    this.addEventListener("revalidate", this);

    this._printerDestination = this.querySelector("#destination");
    this.printButton = this.querySelector("#print-button");
  }

  removeNonPdfSettings() {
    let selectors = ["#backgrounds", "#source-version-selection"];
    for (let selector of selectors) {
      this.querySelector(selector).remove();
    }
    let moreSettings = this.querySelector("#more-settings-options");
    if (moreSettings.children.length <= 1) {
      moreSettings.remove();
    }
  }

  requestPrint() {
    this.requestSubmit(this.printButton);
  }

  update(settings) {
    // If there are no default system printers available and we are not on mac,
    // we should hide the system dialog because it won't be populated with
    // the correct settings. Mac and Gtk support save to pdf functionality
    // in the native dialog, so it can be shown regardless.
    this.querySelector("#system-print").hidden =
      AppConstants.platform === "win" && !settings.defaultSystemPrinter;

    this.querySelector("#two-sided-printing").hidden = !settings.supportsDuplex;
  }

  enable() {
    let isValid = this.checkValidity();
    document.body.toggleAttribute("invalid", !isValid);
    if (isValid) {
      for (let element of this.elements) {
        if (!element.hasAttribute("disallowed")) {
          element.disabled = false;
        }
      }
      // aria-describedby will usually cause the first value to be reported.
      // Unfortunately, screen readers don't pick up description changes from
      // dialogs, so we must use a live region. To avoid double reporting of
      // the first value, we don't set aria-live initially. We only set it for
      // subsequent updates.
      // aria-live is set on the parent because sheetCount itself might be
      // hidden and then shown, and updates are only reported for live
      // regions that were already visible.
      document
        .querySelector("#sheet-count")
        .parentNode.setAttribute("aria-live", "polite");
    } else {
      // Find the invalid element
      let invalidElement;
      for (let element of this.elements) {
        if (!element.checkValidity()) {
          invalidElement = element;
          break;
        }
      }
      let section = invalidElement.closest(".section-block");
      document.body.toggleAttribute("invalid", !isValid);
      // We're hiding the sheet count and aria-describedby includes the
      // content of hidden elements, so remove aria-describedby.
      document.body.removeAttribute("aria-describedby");
      for (let element of this.elements) {
        // If we're valid, enable all inputs.
        // Otherwise, disable the valid inputs other than the cancel button and the elements
        // in the invalid section.
        element.disabled =
          element.hasAttribute("disallowed") ||
          (!isValid &&
            element.validity.valid &&
            element.name != "cancel" &&
            element.closest(".section-block") != this._printerDestination &&
            element.closest(".section-block") != section);
      }
    }
  }

  disable(filterFn) {
    for (let element of this.elements) {
      if (filterFn && !filterFn(element)) {
        continue;
      }
      element.disabled = element.name != "cancel";
    }
  }

  handleEvent(e) {
    if (e.target.id == "open-dialog-link") {
      this.dispatchEvent(new Event("open-system-dialog", { bubbles: true }));
      return;
    }

    if (e.type == "submit") {
      e.preventDefault();
      if (e.submitter.name == "print" && this.checkValidity()) {
        this.dispatchEvent(new Event("print", { bubbles: true }));
      }
    } else if (
      (e.type == "input" || e.type == "revalidate") &&
      !this.printerChanging
    ) {
      this.enable();
    }
  }
}
customElements.define("print-form", PrintUIForm, { extends: "form" });

class PrintSettingSelect extends PrintUIControlMixin(HTMLSelectElement) {
  initialize() {
    super.initialize();
    this.addEventListener("keypress", this);
  }

  connectedCallback() {
    this.settingName = this.dataset.settingName;
    super.connectedCallback();
  }

  setOptions(optionValues = []) {
    this.textContent = "";
    for (let optionData of optionValues) {
      let opt = new Option(
        optionData.name,
        "value" in optionData ? optionData.value : optionData.name
      );
      if (optionData.nameId) {
        document.l10n.setAttributes(opt, optionData.nameId);
      }
      // option selectedness is set via update() and assignment to this.value
      this.options.add(opt);
    }
  }

  update(settings) {
    if (this.settingName) {
      this.value = settings[this.settingName];
    }
  }

  handleEvent(e) {
    if (e.type == "input" && this.settingName) {
      this.dispatchSettingsChange({
        [this.settingName]: e.target.value,
      });
    } else if (e.type == "keypress") {
      if (
        e.key == "Enter" &&
        (!e.metaKey || AppConstants.platform == "macosx")
      ) {
        this.form.requestPrint();
      }
    }
  }
}
customElements.define("setting-select", PrintSettingSelect, {
  extends: "select",
});

class PrintSettingNumber extends PrintUIControlMixin(HTMLInputElement) {
  initialize() {
    super.initialize();
    this.addEventListener("beforeinput", e => this.preventWhitespaceEntry(e));
    this.addEventListener("paste", e => this.pasteWithoutWhitespace(e));
  }

  connectedCallback() {
    this.type = "number";
    this.settingName = this.dataset.settingName;
    super.connectedCallback();
  }

  update(settings) {
    if (this.settingName) {
      this.value = settings[this.settingName];
    }
  }

  preventWhitespaceEntry(e) {
    if (e.data && !e.data.trim().length) {
      e.preventDefault();
    }
  }

  pasteWithoutWhitespace(e) {
    // Prevent original value from being pasted
    e.preventDefault();

    // Manually update input's value with sanitized clipboard data
    let paste = (e.clipboardData || window.clipboardData)
      .getData("text")
      .trim();
    this.value = paste;
  }

  handleEvent(e) {
    switch (e.type) {
      case "input":
        if (this.settingName && this.checkValidity()) {
          this.dispatchSettingsChange({
            [this.settingName]: this.value,
          });
        }
        break;
    }
  }
}
customElements.define("setting-number", PrintSettingNumber, {
  extends: "input",
});

class PrintSettingCheckbox extends PrintUIControlMixin(HTMLInputElement) {
  connectedCallback() {
    this.type = "checkbox";
    this.settingName = this.dataset.settingName;
    super.connectedCallback();
  }

  update(settings) {
    this.checked = settings[this.settingName];
  }

  handleEvent(e) {
    this.dispatchSettingsChange({
      [this.settingName]: this.checked,
    });
  }
}
customElements.define("setting-checkbox", PrintSettingCheckbox, {
  extends: "input",
});

class PrintSettingRadio extends PrintUIControlMixin(HTMLInputElement) {
  connectedCallback() {
    this.type = "radio";
    this.settingName = this.dataset.settingName;
    super.connectedCallback();
  }

  update(settings) {
    this.checked = settings[this.settingName] == this.value;
  }

  handleEvent(e) {
    this.dispatchSettingsChange({
      [this.settingName]: this.value,
    });
  }
}
customElements.define("setting-radio", PrintSettingRadio, {
  extends: "input",
});

class DestinationPicker extends PrintSettingSelect {
  initialize() {
    super.initialize();
    document.addEventListener("available-destinations", this);
  }

  update(settings) {
    super.update(settings);
    let isPdf = settings.outputFormat == Ci.nsIPrintSettings.kOutputFormatPDF;
    this.setAttribute("output", isPdf ? "pdf" : "paper");
  }

  handleEvent(e) {
    super.handleEvent(e);

    if (e.type == "available-destinations") {
      this.setOptions(e.detail);
    }
  }
}
customElements.define("destination-picker", DestinationPicker, {
  extends: "select",
});

class ColorModePicker extends PrintSettingSelect {
  update(settings) {
    this.value = settings[this.settingName] ? "color" : "bw";
    let canSwitch = settings.supportsColor && settings.supportsMonochrome;
    if (this.disablePicker != canSwitch) {
      this.toggleAttribute("disallowed", !canSwitch);
      this.disabled = !canSwitch;
    }
    this.disablePicker = canSwitch;
  }

  handleEvent(e) {
    if (e.type == "input") {
      // turn our string value into the expected boolean
      this.dispatchSettingsChange({
        [this.settingName]: this.value == "color",
      });
    }
  }
}
customElements.define("color-mode-select", ColorModePicker, {
  extends: "select",
});

class PaperSizePicker extends PrintSettingSelect {
  initialize() {
    super.initialize();
    this._printerName = null;
    this._section = this.closest(".section-block");
    document.addEventListener("hide-paper-size", this);
  }

  update(settings) {
    if (settings.printerName !== this._printerName) {
      this._printerName = settings.printerName;
      this.setOptions(settings.paperSizes);
    }
    this.value = settings.paperId;

    // Unhide the paper-size picker, if we've stopped using the page size as paper-size.
    if (this._section.hidden && !settings.usePageRuleSizeAsPaperSize) {
      this._section.hidden = false;
    }
  }

  handleEvent(e) {
    super.handleEvent(e);
    const { type } = e;
    if (type == "hide-paper-size") {
      this._section.hidden = true;
    }
  }
}
customElements.define("paper-size-select", PaperSizePicker, {
  extends: "select",
});

class OrientationInput extends PrintUIControlMixin(HTMLElement) {
  initialize() {
    super.initialize();
    document.addEventListener("hide-orientation", this);
  }

  get templateId() {
    return "orientation-template";
  }

  update(settings) {
    for (let input of this.querySelectorAll("input")) {
      input.checked = settings.orientation == input.value;
    }
  }

  handleEvent(e) {
    if (e.type == "hide-orientation") {
      document.getElementById("orientation").hidden = true;
      return;
    }
    this.dispatchSettingsChange({
      orientation: e.target.value,
    });
  }
}
customElements.define("orientation-input", OrientationInput);

class CopiesInput extends PrintUIControlMixin(HTMLElement) {
  get templateId() {
    return "copy-template";
  }

  initialize() {
    super.initialize();
    this._copiesSection = this.closest(".section-block");
    this._copiesInput = this.querySelector("#copies-count");
    this._copiesError = this.querySelector("#error-invalid-copies");
  }

  update(settings) {
    this._copiesSection.hidden = settings.willSaveToFile;
    this._copiesError.hidden = true;
  }

  handleEvent(e) {
    this._copiesError.hidden = this._copiesInput.checkValidity();
  }
}
customElements.define("copy-count-input", CopiesInput);

class ScaleInput extends PrintUIControlMixin(HTMLElement) {
  get templateId() {
    return "scale-template";
  }

  initialize() {
    super.initialize();

    this._percentScale = this.querySelector("#percent-scale");
    this._shrinkToFitChoice = this.querySelector("#fit-choice");
    this._scaleChoice = this.querySelector("#percent-scale-choice");
    this._scaleError = this.querySelector("#error-invalid-scale");
  }

  updateScale() {
    this.dispatchSettingsChange({
      scaling: Number(this._percentScale.value / 100),
    });
  }

  update(settings) {
    let { scaling, shrinkToFit, printerName } = settings;
    this._shrinkToFitChoice.checked = shrinkToFit;
    this._scaleChoice.checked = !shrinkToFit;
    if (this.disableScale != shrinkToFit) {
      this._percentScale.disabled = shrinkToFit;
      this._percentScale.toggleAttribute("disallowed", shrinkToFit);
    }
    this.disableScale = shrinkToFit;
    if (!this.printerName) {
      this.printerName = printerName;
    }

    // If the user had an invalid input and switches back to "fit to page",
    // we repopulate the scale field with the stored, valid scaling value.
    let isValid = this._percentScale.checkValidity();
    if (
      !this._percentScale.value ||
      (this._shrinkToFitChoice.checked && !isValid) ||
      (this.printerName != printerName && !isValid)
    ) {
      // Only allow whole numbers. 0.14 * 100 would have decimal places, etc.
      this._percentScale.value = parseInt(scaling * 100, 10);
      this.printerName = printerName;
      if (!isValid) {
        this.dispatchEvent(new Event("revalidate", { bubbles: true }));
        this._scaleError.hidden = true;
      }
    }
  }

  handleEvent(e) {
    if (e.target == this._shrinkToFitChoice || e.target == this._scaleChoice) {
      if (!this._percentScale.checkValidity()) {
        this._percentScale.value = 100;
      }
      let scale =
        e.target == this._shrinkToFitChoice
          ? 1
          : Number(this._percentScale.value / 100);
      this.dispatchSettingsChange({
        shrinkToFit: this._shrinkToFitChoice.checked,
        scaling: scale,
      });
      this._scaleError.hidden = true;
    } else if (e.type == "input") {
      if (this._percentScale.checkValidity()) {
        this.updateScale();
      }
    }

    window.clearTimeout(this.showErrorTimeoutId);
    if (this._percentScale.validity.valid) {
      this._scaleError.hidden = true;
    } else {
      this.cancelSettingsChange({ scaling: true });
      this.showErrorTimeoutId = window.setTimeout(() => {
        this._scaleError.hidden = false;
      }, INPUT_DELAY_MS);
    }
  }
}
customElements.define("scale-input", ScaleInput);

class PageRangeInput extends PrintUIControlMixin(HTMLElement) {
  initialize() {
    super.initialize();

    this._rangeInput = this.querySelector("#custom-range");
    this._rangeInput.title = "";
    this._rangePicker = this.querySelector("#range-picker");
    this._rangePickerEvenOption = this._rangePicker.namedItem("even");
    this._rangeError = this.querySelector("#error-invalid-range");
    this._startRangeOverflowError = this.querySelector(
      "#error-invalid-start-range-overflow"
    );

    this._pagesSet = new Set();

    this.addEventListener("keypress", this);
    this.addEventListener("paste", this);
    document.addEventListener("page-count", this);
  }

  get templateId() {
    return "page-range-template";
  }

  updatePageRange() {
    let isCustom = this._rangePicker.value == "custom";
    let isCurrent = this._rangePicker.value == "current";

    if (!isCurrent) {
      this._currentPage = null;
    }

    if (isCustom) {
      this.validateRangeInput();
    } else if (isCurrent) {
      this._currentPage = this._rangeInput.value =
        this._currentPage || this.getCurrentVisiblePageNumber();
      this.validateRangeInput();
    } else {
      this._pagesSet.clear();

      if (this._rangePicker.value == "odd") {
        for (let i = 1; i <= this._numPages; i += 2) {
          this._pagesSet.add(i);
        }
      } else if (this._rangePicker.value == "even") {
        for (let i = 2; i <= this._numPages; i += 2) {
          this._pagesSet.add(i);
        }
      }

      if (!this._rangeInput.checkValidity()) {
        this._rangeInput.setCustomValidity("");
        this._rangeInput.value = "";
      }
    }

    this.dispatchEvent(new Event("revalidate", { bubbles: true }));

    document.l10n.setAttributes(
      this._rangeError,
      "printui-error-invalid-range",
      {
        numPages: this._numPages,
      }
    );

    // If it's valid, update the page range and hide the error messages.
    // Otherwise, set the appropriate error message
    if (this._rangeInput.validity.valid || !isCustom) {
      window.clearTimeout(this.showErrorTimeoutId);
      this._startRangeOverflowError.hidden = this._rangeError.hidden = true;
    } else {
      this._rangeInput.focus();
    }
  }

  dispatchPageRange(shouldCancel = true) {
    window.clearTimeout(this.showErrorTimeoutId);
    if (
      this._rangeInput.validity.valid ||
      this._rangePicker.value != "custom"
    ) {
      this.dispatchSettingsChange({
        pageRanges: this.formatPageRange(),
      });
    } else {
      if (shouldCancel) {
        this.cancelSettingsChange({ pageRanges: true });
      }
      this.showErrorTimeoutId = window.setTimeout(() => {
        this._rangeError.hidden =
          this._rangeInput.validationMessage != "invalid";
        this._startRangeOverflowError.hidden =
          this._rangeInput.validationMessage != "startRangeOverflow";
      }, INPUT_DELAY_MS);
    }
  }

  // The platform expects pageRanges to be an array of
  // ranges represented by ints.
  // Ex: Printing pages 1-3 would return [1,3]
  // Ex: Printing page 1 would return [1,1]
  // Ex: Printing pages 1-2,4 would return [1,2,4,4]
  formatPageRange() {
    if (
      this._pagesSet.size == 0 ||
      (this._rangePicker.value == "custom" && this._rangeInput.value == "") ||
      this._rangePicker.value == "all"
    ) {
      // Show all pages.
      return [];
    }
    let pages = Array.from(this._pagesSet).sort((a, b) => a - b);

    let formattedRanges = [];
    let startRange = pages[0];
    let endRange = pages[0];
    formattedRanges.push(startRange);

    for (let i = 1; i < pages.length; i++) {
      let currentPage = pages[i - 1];
      let nextPage = pages[i];
      if (nextPage > currentPage + 1) {
        formattedRanges.push(endRange);
        startRange = endRange = nextPage;
        formattedRanges.push(startRange);
      } else {
        endRange = nextPage;
      }
    }
    formattedRanges.push(endRange);

    return formattedRanges;
  }

  update(settings) {
    let { pageRanges, printerName } = settings;

    this.toggleAttribute("all-pages", !pageRanges.length);
    if (!this.printerName) {
      this.printerName = printerName;
    }

    let isValid = this._rangeInput.checkValidity();

    if (this.printerName != printerName && !isValid) {
      this.printerName = printerName;
      this._rangeInput.value = "";
      this.updatePageRange();
      this.dispatchPageRange();
    }
  }

  handleKeypress(e) {
    let char = String.fromCharCode(e.charCode);
    let acceptedChar = char.match(/^[0-9,-]$/);
    if (!acceptedChar && !char.match("\x00") && !e.ctrlKey && !e.metaKey) {
      e.preventDefault();
    }
  }

  handlePaste(e) {
    let paste = (e.clipboardData || window.clipboardData)
      .getData("text")
      .trim();
    if (!paste.match(/^[0-9,-]*$/)) {
      e.preventDefault();
    }
  }

  // This method has been abstracted into a helper for testing purposes
  _validateRangeInput(value, numPages) {
    this._pagesSet.clear();
    var ranges = value.split(",");

    for (let range of ranges) {
      let rangeParts = range.split("-");
      if (rangeParts.length > 2) {
        this._rangeInput.setCustomValidity("invalid");
        this._rangeInput.title = "";
        this._pagesSet.clear();
        return;
      }
      let startRange = parseInt(rangeParts[0], 10);
      let endRange = parseInt(
        rangeParts.length == 2 ? rangeParts[1] : rangeParts[0],
        10
      );

      if (isNaN(startRange) && isNaN(endRange)) {
        continue;
      }

      // If the startRange was not specified, then we infer this
      // to be 1.
      if (isNaN(startRange) && rangeParts[0] == "") {
        startRange = 1;
      }
      // If the end range was not specified, then we infer this
      // to be the total number of pages.
      if (isNaN(endRange) && rangeParts[1] == "") {
        endRange = numPages;
      }

      // Check the range for errors
      if (endRange < startRange) {
        this._rangeInput.setCustomValidity("startRangeOverflow");
        this._pagesSet.clear();
        return;
      } else if (
        startRange > numPages ||
        endRange > numPages ||
        startRange == 0
      ) {
        this._rangeInput.setCustomValidity("invalid");
        this._rangeInput.title = "";
        this._pagesSet.clear();
        return;
      }

      for (let i = startRange; i <= endRange; i++) {
        this._pagesSet.add(i);
      }
    }

    this._rangeInput.setCustomValidity("");
  }

  validateRangeInput() {
    let value = ["custom", "current"].includes(this._rangePicker.value)
      ? this._rangeInput.value
      : "";
    this._validateRangeInput(value, this._numPages);
  }

  getCurrentVisiblePageNumber() {
    let pageNum = parseInt(
      PrintEventHandler.printPreviewEl.lastPreviewBrowser.getAttribute(
        "current-page"
      )
    );
    return isNaN(pageNum) ? 1 : pageNum;
  }

  handleEvent(e) {
    if (e.type == "keypress") {
      if (e.target == this._rangeInput) {
        this.handleKeypress(e);
      }
      return;
    }

    if (e.type === "paste" && e.target == this._rangeInput) {
      this.handlePaste(e);
      return;
    }

    if (e.type == "page-count") {
      let { totalPages } = e.detail;
      // This means we have already handled the page count event
      // and do not need to dispatch another event.
      if (this._numPages == totalPages) {
        return;
      }

      this._numPages = totalPages;
      this._rangeInput.disabled = false;
      this._rangePickerEvenOption.disabled = this._numPages < 2;

      let prevPages = Array.from(this._pagesSet);
      this.updatePageRange();
      if (
        prevPages.length != this._pagesSet.size ||
        !prevPages.every(page => this._pagesSet.has(page))
      ) {
        // If the calculated set of pages has changed then we need to dispatch
        // a new pageRanges setting :(
        // Ideally this would be resolved in the settings code since it should
        // only happen for the "N-" case where pages N through the end of the
        // document are in the range.
        this.dispatchPageRange(false);
      }

      return;
    }

    if (e.target == this._rangePicker) {
      this._rangeInput.hidden = e.target.value != "custom";
      this.updatePageRange();
      this.dispatchPageRange();
      if (!this._rangeInput.hidden) {
        this._rangeInput.select();
      }
    } else if (e.target == this._rangeInput) {
      this._rangeInput.focus();
      if (this._numPages) {
        this.updatePageRange();
        this.dispatchPageRange();
      }
    }
  }
}
customElements.define("page-range-input", PageRangeInput);

class MarginsPicker extends PrintUIControlMixin(HTMLElement) {
  initialize() {
    super.initialize();

    this._marginPicker = this.querySelector("#margins-picker");
    this._customTopMargin = this.querySelector("#custom-margin-top");
    this._customBottomMargin = this.querySelector("#custom-margin-bottom");
    this._customLeftMargin = this.querySelector("#custom-margin-left");
    this._customRightMargin = this.querySelector("#custom-margin-right");
    this._marginError = this.querySelector("#error-invalid-margin");
    this._sizeUnit = null;
    this._toInchesMultiplier = 1;
  }

  get templateId() {
    return "margins-template";
  }

  updateCustomMargins() {
    let newMargins = {
      marginTop: this.toInchValue(this._customTopMargin.value),
      marginBottom: this.toInchValue(this._customBottomMargin.value),
      marginLeft: this.toInchValue(this._customLeftMargin.value),
      marginRight: this.toInchValue(this._customRightMargin.value),
    };

    this.dispatchSettingsChange({
      margins: "custom",
      customMargins: newMargins,
    });
    this._marginError.hidden = true;
  }

  updateMaxValues() {
    let maxWidth = this.toCurrentUnitValue(this._maxWidth);
    let maxHeight = this.toCurrentUnitValue(this._maxHeight);
    this._customTopMargin.max = this.formatMaxAttr(
      maxHeight - this._customBottomMargin.value
    );
    this._customBottomMargin.max = this.formatMaxAttr(
      maxHeight - this._customTopMargin.value
    );
    this._customLeftMargin.max = this.formatMaxAttr(
      maxWidth - this._customRightMargin.value
    );
    this._customRightMargin.max = this.formatMaxAttr(
      maxWidth - this._customLeftMargin.value
    );
  }

  truncateTwoDecimals(val) {
    if (val.split(".")[1].length > 2) {
      let dotIndex = val.indexOf(".");
      return val.slice(0, dotIndex + 3);
    }
    return val;
  }

  formatMaxAttr(val) {
    const strVal = val.toString();
    if (strVal.includes(".")) {
      return this.truncateTwoDecimals(strVal);
    }
    return val;
  }

  formatMargin(target) {
    if (target.value.includes(".")) {
      target.value = this.truncateTwoDecimals(target.value);
    }
  }

  toCurrentUnitValue(val) {
    if (typeof val == "string") {
      val = parseFloat(val);
    }
    return val / this._toInchesMultiplier;
  }

  toInchValue(val) {
    if (typeof val == "string") {
      val = parseFloat(val);
    }
    return val * this._toInchesMultiplier;
  }

  setAllMarginValues(settings) {
    this._customTopMargin.value = this.toCurrentUnitValue(
      settings.customMargins.marginTop
    ).toFixed(2);
    this._customBottomMargin.value = this.toCurrentUnitValue(
      settings.customMargins.marginBottom
    ).toFixed(2);
    this._customLeftMargin.value = this.toCurrentUnitValue(
      settings.customMargins.marginLeft
    ).toFixed(2);
    this._customRightMargin.value = this.toCurrentUnitValue(
      settings.customMargins.marginRight
    ).toFixed(2);
  }

  update(settings) {
    // Re-evaluate which margin options should be enabled whenever the printer or paper changes
    this._toInchesMultiplier =
      settings.paperSizeUnit == settings.kPaperSizeMillimeters
        ? INCHES_PER_MM
        : 1;
    if (
      settings.paperId !== this._paperId ||
      settings.printerName !== this._printerName ||
      settings.orientation !== this._orientation
    ) {
      let enabledMargins = settings.marginOptions;
      for (let option of this._marginPicker.options) {
        option.hidden = !enabledMargins[option.value];
      }
      this._paperId = settings.paperId;
      this._printerName = settings.printerName;
      this._orientation = settings.orientation;

      // Paper dimensions are in the paperSizeUnit. As the margin values are in inches
      // we'll normalize to that when storing max dimensions
      let height =
        this._orientation == 0 ? settings.paperHeight : settings.paperWidth;
      let width =
        this._orientation == 0 ? settings.paperWidth : settings.paperHeight;
      let heightInches =
        Math.round(this._toInchesMultiplier * height * 100) / 100;
      let widthInches =
        Math.round(this._toInchesMultiplier * width * 100) / 100;

      this._maxHeight =
        heightInches -
        settings.unwriteableMarginTop -
        settings.unwriteableMarginBottom;
      this._maxWidth =
        widthInches -
        settings.unwriteableMarginLeft -
        settings.unwriteableMarginRight;

      // The values in custom fields should be initialized to custom margin values
      // and must be overriden if they are no longer valid.
      this.setAllMarginValues(settings);
      this.updateMaxValues();
      this.dispatchEvent(new Event("revalidate", { bubbles: true }));
      this._marginError.hidden = true;
    }

    if (settings.paperSizeUnit !== this._sizeUnit) {
      this._sizeUnit = settings.paperSizeUnit;
      let unitStr =
        this._sizeUnit == settings.kPaperSizeMillimeters ? "mm" : "inches";
      for (let elem of this.querySelectorAll("[data-unit-prefix-l10n-id]")) {
        let l10nId = elem.getAttribute("data-unit-prefix-l10n-id") + unitStr;
        document.l10n.setAttributes(elem, l10nId);
      }
    }

    // We need to ensure we don't override the value if the value should be custom.
    if (this._marginPicker.value != "custom") {
      // Reset the custom margin values if they are not valid and revalidate the form
      if (
        !this._customTopMargin.checkValidity() ||
        !this._customBottomMargin.checkValidity() ||
        !this._customLeftMargin.checkValidity() ||
        !this._customRightMargin.checkValidity()
      ) {
        window.clearTimeout(this.showErrorTimeoutId);
        this.setAllMarginValues(settings);
        this.updateMaxValues();
        this.dispatchEvent(new Event("revalidate", { bubbles: true }));
        this._marginError.hidden = true;
      }
      if (settings.margins == "custom") {
        // Ensure that we display the custom margin boxes
        this.querySelector(".margin-group").hidden = false;
      }
      this._marginPicker.value = settings.margins;
    }
  }

  handleEvent(e) {
    if (e.target == this._marginPicker) {
      let customMargin = e.target.value == "custom";
      this.querySelector(".margin-group").hidden = !customMargin;
      if (customMargin) {
        // Update the custom margin values to ensure consistency
        this.updateCustomMargins();
        return;
      }

      this.dispatchSettingsChange({
        margins: e.target.value,
        customMargins: null,
      });
    }

    if (
      e.target == this._customTopMargin ||
      e.target == this._customBottomMargin ||
      e.target == this._customLeftMargin ||
      e.target == this._customRightMargin
    ) {
      if (e.target.checkValidity()) {
        this.updateMaxValues();
      }
      if (
        this._customTopMargin.validity.valid &&
        this._customBottomMargin.validity.valid &&
        this._customLeftMargin.validity.valid &&
        this._customRightMargin.validity.valid
      ) {
        this.formatMargin(e.target);
        this.updateCustomMargins();
      } else if (e.target.validity.stepMismatch) {
        // If this is the third digit after the decimal point, we should
        // truncate the string.
        this.formatMargin(e.target);
      }
    }

    window.clearTimeout(this.showErrorTimeoutId);
    if (
      this._customTopMargin.validity.valid &&
      this._customBottomMargin.validity.valid &&
      this._customLeftMargin.validity.valid &&
      this._customRightMargin.validity.valid
    ) {
      this._marginError.hidden = true;
    } else {
      this.cancelSettingsChange({ customMargins: true, margins: true });
      this.showErrorTimeoutId = window.setTimeout(() => {
        this._marginError.hidden = false;
      }, INPUT_DELAY_MS);
    }
  }
}
customElements.define("margins-select", MarginsPicker);

class TwistySummary extends PrintUIControlMixin(HTMLElement) {
  get isOpen() {
    return this.closest("details")?.hasAttribute("open");
  }

  get templateId() {
    return "twisty-summary-template";
  }

  initialize() {
    if (this._initialized) {
      return;
    }
    super.initialize();
    this.label = this.querySelector(".label");

    this.addEventListener("click", this);
    let shouldOpen = Services.prefs.getBoolPref(
      "print.more-settings.open",
      false
    );
    this.closest("details").open = shouldOpen;
    this.updateSummary(shouldOpen);
  }

  handleEvent(e) {
    let willOpen = !this.isOpen;
    Services.prefs.setBoolPref("print.more-settings.open", willOpen);
    this.updateSummary(willOpen);
  }

  updateSummary(open) {
    document.l10n.setAttributes(
      this.label,
      open
        ? this.getAttribute("data-open-l10n-id")
        : this.getAttribute("data-closed-l10n-id")
    );
  }
}
customElements.define("twisty-summary", TwistySummary);

class PageCount extends PrintUIControlMixin(HTMLElement) {
  initialize() {
    super.initialize();
    document.addEventListener("page-count", this);
  }

  update(settings) {
    this.numCopies = settings.numCopies;
    this.duplex = settings.duplex;
    this.outputDestination = settings.outputDestination;
    this.render();
  }

  render() {
    if (!this.numCopies || !this.sheetCount) {
      return;
    }

    let sheetCount = this.sheetCount;

    // When printing to a printer (not to a file) update
    // the sheet count to account for duplex printing.
    if (
      this.outputDestination == Ci.nsIPrintSettings.kOutputDestinationPrinter &&
      this.duplex != Ci.nsIPrintSettings.kDuplexNone
    ) {
      sheetCount = Math.ceil(sheetCount / 2);
    }

    sheetCount *= this.numCopies;

    document.l10n.setAttributes(this, "printui-sheets-count", {
      sheetCount,
    });

    // The loading attribute must be removed on first render
    if (this.hasAttribute("loading")) {
      this.removeAttribute("loading");
    }

    if (this.id) {
      // We're showing the sheet count, so let it describe the dialog.
      document.body.setAttribute("aria-describedby", this.id);
    }
  }

  handleEvent(e) {
    this.sheetCount = e.detail.sheetCount;
    this.render();
  }
}
customElements.define("page-count", PageCount);

class PrintBackgrounds extends PrintSettingCheckbox {
  update(settings) {
    super.update(settings);
    let isSimplified = settings.sourceVersion == "simplified";
    this.disabled = isSimplified;
    this.toggleAttribute("disallowed", isSimplified);
    this.checked = !isSimplified && settings.printBackgrounds;
  }
}
customElements.define("print-backgrounds", PrintBackgrounds, {
  extends: "input",
});

class PrintButton extends PrintUIControlMixin(HTMLButtonElement) {
  update(settings) {
    let l10nId =
      settings.printerName == PrintUtils.SAVE_TO_PDF_PRINTER
        ? "printui-primary-button-save"
        : "printui-primary-button";
    document.l10n.setAttributes(this, l10nId);
  }
}
customElements.define("print-button", PrintButton, { extends: "button" });

class CancelButton extends HTMLButtonElement {
  constructor() {
    super();
    this.addEventListener("click", () => {
      this.dispatchEvent(new Event("cancel-print", { bubbles: true }));
    });
  }
}
customElements.define("cancel-button", CancelButton, { extends: "button" });

async function pickFileName(contentTitle, currentURI) {
  let picker = Cc["@mozilla.org/filepicker;1"].createInstance(Ci.nsIFilePicker);
  let [title] = await document.l10n.formatMessages([
    { id: "printui-save-to-pdf-title" },
  ]);
  title = title.value;

  let filename;
  if (contentTitle != "") {
    filename = contentTitle;
  } else {
    let url = new URL(currentURI);
    let path = decodeURIComponent(url.pathname);
    path = path.replace(/\/$/, "");
    filename = path.split("/").pop();
    if (filename == "") {
      filename = url.hostname;
    }
  }
  if (!filename.endsWith(".pdf")) {
    // macOS and linux don't set the extension based on the default extension.
    // Windows won't add the extension a second time, fortunately.
    // If it already ends with .pdf though, adding it again isn't needed.
    filename += ".pdf";
  }
  filename = DownloadPaths.sanitize(filename);

  picker.init(
    window.docShell.chromeEventHandler.ownerGlobal,
    title,
    Ci.nsIFilePicker.modeSave
  );
  picker.appendFilter("PDF", "*.pdf");
  picker.defaultExtension = "pdf";
  picker.defaultString = filename;

  let retval = await new Promise(resolve => picker.open(resolve));

  if (retval == 1) {
    throw new Error({ reason: "cancelled" });
  } else {
    // OK clicked (retval == 0) or replace confirmed (retval == 2)

    // Workaround: When trying to replace an existing file that is open in another application (i.e. a locked file),
    // the print progress listener is never called. This workaround ensures that a correct status is always returned.
    try {
      let fstream = Cc[
        "@mozilla.org/network/file-output-stream;1"
      ].createInstance(Ci.nsIFileOutputStream);
      fstream.init(picker.file, 0x2a, 0o666, 0); // ioflags = write|create|truncate, file permissions = rw-rw-rw-
      fstream.close();

      // Remove the file to reduce the likelihood of the user opening an empty or damaged fle when the
      // preview is loading
      await IOUtils.remove(picker.file.path);
    } catch (e) {
      throw new Error({ reason: retval == 0 ? "not_saved" : "not_replaced" });
    }
  }

  return picker.file.path;
}