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// To learn how to use this script, refer to the documentation:
// https://developers.google.com/apps-script/samples/automations/course-feedback-response

/*
Copyright 2022 Google LLC

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

/**
 * Creates custom menu for user to run scripts.
 */
function onOpen() {
  let ui = SpreadsheetApp.getUi();
  ui.createMenu('Form Reply Tool')
      .addItem('Enable auto draft replies', 'installTrigger')
      .addToUi();
}

/**
 * Installs a trigger on the Spreadsheet for when a Form response is submitted.
 */
function installTrigger() {
  ScriptApp.newTrigger('onFormSubmit')
      .forSpreadsheet(SpreadsheetApp.getActive())
      .onFormSubmit()
      .create();
}

/**
 * Creates a draft email for every response on a form
 *
 * @param {Object} event - Form submit event
 */
function onFormSubmit(e) {
  let responses = e.namedValues;

  // parse form response data
  let timestamp = responses.Timestamp[0];
  let email = responses['Email address'][0].trim();

  // create email body
  let emailBody = createEmailBody(responses);

  // create draft email
  createDraft(timestamp, email, emailBody);
}

/**
 * Creates email body and includes feedback from Google Form.
 *
 * @param {string} responses - The form response data
 * @return {string} - The email body as an HTML string
 */
function createEmailBody(responses) {
  // parse form response data
  let name = responses.Name[0].trim();
  let industry = responses['What industry do you work in?'][0];
  let source = responses['How did you find out about this course?'][0];
  let rating = responses['On a scale of 1 - 5 how would you rate this course?'][0];
  let productFeedback = responses['What could be different to make it a 5 rating?'][0];
  let otherFeedback = responses['Any other feedback?'][0];

  // create email body
  let htmlBody = 'Hi ' + name + ',<br><br>' +
    'Thanks for responding to our course feedback questionnaire.<br><br>' +
      'It\'s really useful to us to help improve this course.<br><br>' +
        'Have a great day!<br><br>' +
          'Thanks,<br>' +
            'Course Team<br><br>' +
              '****************************************************************<br><br>' +
                '<i>Your feedback:<br><br>' +
                  'What industry do you work in?<br><br>' +
                    industry + '<br><br>' +
                      'How did you find out about this course?<br><br>' +
                        source + '<br><br>' +
                          'On a scale of 1 - 5 how would you rate this course?<br><br>' +
                            rating + '<br><br>' +
                              'What could be different to make it a 5 rating?<br><br>' +
                                productFeedback + '<br><br>' +
                                  'Any other feedback?<br><br>' +
                                    otherFeedback + '<br><br></i>';

  return htmlBody;
}

/**
 * Create a draft email with the feedback
 *
 * @param {string} timestamp Timestamp for the form response
 * @param {string} email Email address from the form response
 * @param {string} emailBody The email body as an HTML string
 */
function createDraft(timestamp, email, emailBody) {
  console.log('draft email create process started');

  // create subject line
  let subjectLine = 'Thanks for your course feedback! ' + timestamp;

  // create draft email
  GmailApp.createDraft(
      email,
      subjectLine,
      '',
      {
        htmlBody: emailBody,
      }
  );
}