import puppeteer from "puppeteer-core";
import chromium from "chrome-aws-lambda";
import middleware from "./_common/middleware.js";

const screenshotHandler = async (targetUrl) => {
  if (!targetUrl) {
    throw new Error("URL is missing from queryStringParameters");
  }

  if (!targetUrl.startsWith("http://") && !targetUrl.startsWith("https://")) {
    targetUrl = "http://" + targetUrl;
  }

  try {
    new URL(targetUrl);
  } catch (error) {
    throw new Error("URL provided is invalid");
  }

  let browser = null;
  try {
    browser = await puppeteer.launch({
      args: [...chromium.args, "--no-sandbox"], // Add --no-sandbox flag
      defaultViewport: { width: 800, height: 600 },
      executablePath:
        process.env.CHROME_PATH || (await chromium.executablePath),
      headless: process.env.HEADLESS ? true : chromium.headless,
      ignoreHTTPSErrors: true,
      ignoreDefaultArgs: ["--disable-extensions"],
    });

    let page = await browser.newPage();

    await page.emulateMediaFeatures([
      { name: "prefers-color-scheme", value: "dark" },
    ]);
    page.setDefaultNavigationTimeout(8000);
    await page.goto(targetUrl, { waitUntil: "domcontentloaded" });

    await page.evaluate(() => {
      const selector = "body";
      return new Promise((resolve, reject) => {
        const element = document.querySelector(selector);
        if (!element) {
          reject(
            new Error(`Error: No element found with selector: ${selector}`)
          );
        }
        resolve();
      });
    });

    const screenshotBuffer = await page.screenshot();
    const base64Screenshot = screenshotBuffer.toString("base64");

    return { image: base64Screenshot };
  } finally {
    if (browser !== null) {
      await browser.close();
    }
  }
};

export const handler = middleware(screenshotHandler);
export default handler;