# Gemini API: Asynchronous JavaScript requests

const module = await import("https://esm.sh/@google/[email protected]");
const GoogleGenAI = module.GoogleGenAI;
const ai = new GoogleGenAI({ apiKey: process.env.GEMINI_API_KEY });

const MODEL_ID = "gemini-2.5-flash" // ["gemini-2.5-flash-lite", "gemini-2.5-flash", "gemini-2.5-pro"]

const prompt = "Describe this image in just 3 words.";

const imgFilenames = ["firefighter.jpg", "elephants.jpeg", "jetpack.jpg"];
const imgDir = "https://storage.googleapis.com/generativeai-downloads/images/";

const imageList = []
for (const imgFilename of imgFilenames) {
  const imageBlob = await fetch(imgDir + imgFilename).then(res => res.blob());
  const imageBase64 = await new Promise((resolve) => {
    const reader = new FileReader();
    reader.onloadend = () => resolve(reader.result.split(',')[1]);
    reader.readAsDataURL(imageBlob);
  });

  imageList.push({ inlineData: { data: imageBase64, mimeType: "image/jpeg" } });
}

async function describeLocalImages() {
  for (const image of imageList) {
    const response = await ai.models.generateContent({
      model: MODEL_ID,
      contents: [prompt, image],
    });
    console.log(response.text);
  }
}

async function downloadImage(imgUrl) {
  const imageBlob = await fetch(imgUrl).then(res => res.blob());
  const imageBase64 = await new Promise((resolve) => {
    const reader = new FileReader();
    reader.onloadend = () => resolve(reader.result.split(',')[1]);
    reader.readAsDataURL(imageBlob);
  });

  return { inlineData: { data: imageBase64, mimeType: "image/jpeg" } };
}

async function processImage(imgPromise) {
  const response = await ai.models.generateContent({
    model: MODEL_ID,
    contents: [prompt, await imgPromise],
  });
  return response.text;
}

const responsePromises = [];

for (const imgFilename of imgFilenames) {
  const imgPromise = downloadImage(imgDir + imgFilename);
  const textPromise = processImage(imgPromise);
  responsePromises.push(textPromise);
}

console.log(`Download and content generation queued for ${responsePromises.length} images.`);

for await (const response of responsePromises) {
  console.log(response);
}