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function createMixersAdCustomizerSource() {
  // This example snippet creates an ad customizer source named "Mixers", modeled after
  // the example data shown at https://support.google.com/google-ads/answer/6072565.
  const sourceName = 'Mixers';

  // Ad Customizer attributes can be added one at a time with `addAttribute` or all at
  // once with `addAttributes`.
  const mixersSourceOperation = AdsApp.newAdCustomizerSourceBuilder()
        .withName(sourceName)
        .addAttribute('Model', 'text')
        .addAttributes({
          'Capacity': 'number',
          'Type': 'text',
          'Start_price': 'price',
          'Sale_ends': 'date',
        })
        .build();

  return mixersSourceOperation;
}

function getAdCustomizerSourceByName(sourceName) {
  let sourceCount = 0;
  let foundSource = null;

  for (const source of AdsApp.adCustomizerSources()) {
    if (source.getName() === sourceName) {
      foundSource = source;
      sourceCount += 1;
    }
  }

  if (foundSource === null) {
    throw new Error(`No Ad Customizer Source found with name "${sourceName}"`);
  }

  if (sourceCount > 1) {
    console.warn(`Found ${sourceCount} Ad Customizer Sources with name "${sourceName}", returning just one of them`);
  }

  console.log(`Source "${foundSource.getName()}" has attributes ${foundSource.getAttributes()}`);
  return foundSource;
}

function getAdCustomizerItems(sourceName) {
  let sourceCount = 0;
  let foundSource = null;

  for (const source of AdsApp.adCustomizerSources()) {
    if (source.getName() === sourceName) {
      foundSource = source;
      sourceCount += 1;
    }
  }

  if (foundSource === null) {
    throw new Error(`No Ad Customizer Source found with name "${sourceName}"`);
  }

  if (sourceCount > 1) {
    console.warn(`Found ${sourceCount} Ad Customizer Sources with name "${sourceName}", using just one of them`);
  }

  const itemIterator = foundSource.items().get();
  console.log(`Source "${foundSource.getName()}" has ${itemIterator.totalNumEntities()} items`);
  return itemIterator;
}

function createMixersAdCustomizerItem() {
  // This example snippet creates an ad customizer item in the source named "Mixers",
  // modeled after the example data shown at
  // https://support.google.com/google-ads/answer/6072565.
  const sourceName = 'Mixers';

  let sourceCount = 0;
  let mixersSource = null;

  for (const source of AdsApp.adCustomizerSources()) {
    if (source.getName() === sourceName) {
      mixersSource = source;
      sourceCount += 1;
    }
  }

  if (mixersSource === null) {
    throw new Error(`No Ad Customizer Source found with name "${sourceName}"`);
  }

  if (sourceCount > 1) {
    console.warn(`Found ${sourceCount} Ad Customizer Sources with name "${sourceName}", using just one of them`);
  }

  // Item values can be specified one at a time with `withAttributeValue` or all at once
  // with `withAttributeValues`.
  const mixersItemOperation = mixersSource.adCustomizerItemBuilder()
        .withAttributeValue('Model', 'ProWhip 300')
        .withAttributeValues({
          'Capacity': 5,
          'Type': 'tilt-head',
          'Start_price': '$199',
          'Sale_ends': '20150515 200000',
        })
        .withTargetKeyword('prowhip 300')
        .build();

  return mixersItemOperation;
}

function createCustomizedMixersExpandedTextAd() {
  // This example snippet creates an ad in the ad group named "Kitchen Store" that
  // shows details based on the data in the ad customizer named "Mixers".  This
  // example is modeled after https://support.google.com/google-ads/answer/6072565.
  const adGroupName = 'Kitchen Store';
  const adGroupIterator = AdsApp.adGroups()
        .withCondition(`ad_group.name = "${adGroupName}"`)
        .get();

  if (!adGroupIterator.hasNext()) {
    throw new Error(`No Ad Group found with name "${adGroupName}"`);
  }

  if (adGroupIterator.totalNumEntities() > 1) {
    console.warn(`Found ${adGroupIterator.totalNumEntities()} Ad Groups with name "${adGroupName}", using just one of them`);
  }

  const adGroup = adGroupIterator.next();
  const mixersAdOperation = adGroup.newAd().expandedTextAdBuilder()
        .withHeadlinePart1('{=Mixers.model}')
        .withHeadlinePart2('Stand Mixer')
        .withDescription1('{=Mixers.Capacity} quart {=Mixers.Type} stand mixer.')
        .withDescription2('{=Mixers.Start_price} - sale ends in {=COUNTDOWN(Mixers.Sale_ends)}.')
        .withFinalUrl('http://www.example.com')
        .build();

  return mixersAdOperation;
}