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/**
 * Adds a section to the Card Builder that displays a "REQUEST PERMISSION" button.
 * When it's clicked, the callback triggers file scope permission flow. This is used in
 * the add-on when the home-page displays basic data.
 */
function addRequestFileScopeButtonToBuilder(cardBuilder) {
    var buttonSection = CardService.newCardSection();
    // If the add-on does not have access permission, add a button that
    // allows the user to provide that permission on a per-file basis.
    var buttonAction = CardService.newAction()
      .setFunctionName("onRequestFileScopeButtonClickedInEditor");

    var button = CardService.newTextButton()
      .setText("Request permission")
      .setBackgroundColor("#4285f4")
      .setTextButtonStyle(CardService.TextButtonStyle.FILLED)
      .setOnClickAction(buttonAction);

    buttonSection.addWidget(button);
    cardBuilder.addSection(buttonSection);
}

/**
 * Callback function for a button action. Instructs Docs to display a
 * permissions dialog to the user, requesting `drive.file` scope for the 
 * current file on behalf of this add-on.
 *
 * @param {Object} e The parameters object that contains the document’s ID
 * @return {editorFileScopeActionResponse}
 */
function onRequestFileScopeButtonClickedInEditor(e) {
  return CardService.newEditorFileScopeActionResponseBuilder()
      .requestFileScopeForActiveDocument().build();

/**
 * Build a simple card that checks selected items' quota usage. Checking
 * quota usage requires user-permissions, so this add-on provides a button
 * to request `drive.file` scope for items the add-on doesn't yet have
 * permission to access.
 *
 * @param e The event object passed containing information about the
 *   current document.
 * @return {Card}
 */
function onDocsHomepage(e) {
  return createAddOnView(e);
}

function onFileScopeGranted(e) {
  return createAddOnView(e);
}

/**
 * For the current document, display either its quota information or
 * a button that allows the user to provide permission to access that
 * file to retrieve its quota details.
 *
 * @param e The event containing information about the current document
 * @return {Card}
 */
function createAddOnView(e) {
  var docsEventObject = e['docs'];
  var builder =  CardService.newCardBuilder();

  var cardSection = CardService.newCardSection();
  if (docsEventObject['addonHasFileScopePermission']) {
    cardSection.setHeader(docsEventObject['title']);
    // This add-on uses the recommended, limited-permission `drive.file`
    // scope to get granular per-file access permissions.
    // See: https://developers.google.com/drive/api/v2/about-auth
    // If the add-on has access permission, read and display its quota.
    cardSection.addWidget(
      CardService.newTextParagraph().setText(
          "This file takes up: " + getQuotaBytesUsed(docsEventObject['id'])));
  } else {
    // If the add-on does not have access permission, add a button that
    // allows the user to provide that permission on a per-file basis.
    cardSection.addWidget(
      CardService.newTextParagraph().setText(
          "The add-on needs permission to access this file's quota."));

    var buttonAction = CardService.newAction()
      .setFunctionName("onRequestFileScopeButtonClicked");

    var button = CardService.newTextButton()
      .setText("Request permission")
      .setOnClickAction(buttonAction);

    cardSection.addWidget(button);
  }
  return builder.addSection(cardSection).build();
}

/**
 * Callback function for a button action. Instructs Docs to display a
 * permissions dialog to the user, requesting `drive.file` scope for the
 * current file on behalf of this add-on.
 *
 * @param {Object} e The parameters object that contains the document’s ID
 * @return {editorFileScopeActionResponse}
 */
function onRequestFileScopeButtonClicked(e) {
  return CardService.newEditorFileScopeActionResponseBuilder()
      .requestFileScopeForActiveDocument().build();
}