Summarizer API は、Bright Sites と Terra が魅力的な記事の要約を作成できるようにします。

// Check if the device supports built-in AI
// Trigger the model download if not yet available, on capable devices
export const deviceCheck = async () => {
  const availability = await Summarizer.availability();
  if (!availability || availability === 'unavailable') {
    return {
      summarizationAvailable: false,
      message:
        "AI summarization tools are not supported on this device" +
        "or the appropriate permissions are not set.",
    }
  }
  if (availability === 'downloadable') {
    const shouldDownload = window.confirm(
      `This page contains an AI summary, using an AI model provided by your
      browser. Downloading the model, which could be multiple gigabytes in size,
      is required to view the summary. Would you like to download the model?`);

    if (!shouldDownload) {
      return {
        summarizationAvailable: false,
        message: "User declined installation.",
      }
    }

    // Trigger an installation
    Summarizer.create();
    return {
      summarizationAvailable: false,
      message: "Installing in the background. This may take a few minutes...",
    }
  }

  if (availability === 'available') {
    return {
      summarizationAvailable: true,
      message: "Ready for use.",
    }
  }
}

/**
* Define the summarizer.
**/
export const aiSummarize = async (textToSummarize, options) => {
  const availableSummarizationTools = getAvailableAiSummarizationTools()

  if (availableSummarizationTools.has('builtInAi') && options?.builtInAI) {
    // Generate the built-in AI summarizer and abort signal
    const summarizer = await createBuiltInAISummarizer(options.builtInAi.options)
    return await summarizer.summarize(textToSummarize, {
      signal: options.builtInAi.signal,
    })
  }
  throw new Error(
    'AI summarization tools are not supported on this device or browser.',
  )
}

/**
* Log preferences in IndexDB for personalization
**/
abortController.current = new AbortController()
const preferencesDB = new PreferencesDB()
const summarization = await aiSummarize(articleContent, {
 clientSideAI: {
   options: await preferencesDB.getCreatesummarizerPreferences(),
   signal: abortController.current.signal,
 },
})

async function summarizerByBuiltInAI(text) {
  if (!(Summarizer)) {
    //Alert users in Portuguese that "Summarizer API is not available"
    cms_alert(ALERT_TYPE_ERROR, "Summarizer API não está disponível.")
    return null
  }

  try {
    const availability = await Summarizer.availability();
    if (availability !== 'available') {
      cms_alert(ALERT_TYPE_ERROR, "Summarizer API não está disponível.")
      return null 
    }

    const summaryContext = "Avoid jargon, use correct grammar, focus on clarity," +
    "and ensure the user can grasp the articles purpose," +
    "without needing to open the original content.";

    const options = {
      sharedContext: summaryContext,
      type: 'teaser',
      format: 'plain-text',
      length: 'long',
    }

    if (availability === 'available') {
      const summarizer = await Summarizer.create(options);
      return await summarizer.summarize(text, {
        context: summaryContext
      })
    }
    // return the download of the Summarizer Model
    if(availability === 'downloadable'){
      return await Summarizer.create();
    }
  } catch (error) {
    //EN: "Error using the Summarizer API"
    cms_alert(ALERT_TYPE_ERROR, "Erro ao usar o Summarizer API.");
    console.error("Erro ao usar o Summarizer API:", error);
    return null
  }
}

async function translateTextByBuiltInAI(text, sourceLanguage, targetLanguage) {
  if (!('translation' in self && 'createTranslator' in self.translation)) {
    return null
  }

  try {
    const translator = await Translator.create({
      sourceLanguage,
      targetLanguage,
    })
    return await translator.translate(text)
  } catch (error) {
    throw error
  }
}
const text = `Title: ${contentTitle};\n\n Sub-title: ${contentSubtitle};\n\n Article content: ${plainText}.`;

const canTranslate = await Translator.availability({
  sourceLanguage: 'pt',
  targetLanguage: 'en',
})

if (canTranslate !== 'available') {
  if (canTranslate === 'downloadable') {
    try {
      await Translator.create({
        sourceLanguage: 'pt',
        targetLanguage: 'en',
      })
      //EN: "Language download completed successfully."
      cms_alert(ALERT_TYPE_OK, "Download do idioma concluído com sucesso.");
    } catch (downloadError) {
      //EN: "Error downloading the language required for translation."
      cms_alert(ALERT_TYPE_ERROR, "Erro ao realizar download do idioma necessário para tradução.");
      return
    }
  } else {
    //EN: "Translation is not available or not ready."
    cms_alert(ALERT_TYPE_ERROR, "A tradução não está disponível ou não está pronta.");
    return
  }
}

const translatedText = await translateTextByBuiltInAI(text, 'pt', 'en') 
const summarizedText = await summarizerByBuiltInAI(translatedText) 
const translatedBackText = await translateTextByBuiltInAI(summarizedText, 'en', 'pt')