instagram.ts

import puppeteer, { Page } from "puppeteer";

const INSTAGRAM_HOST = "https://www.instagram.com/";

export default async function instagram(
  username: string,
  password: string,
  options?: { headless: boolean }
) {
  const [page, browser] = await initialize();
  await login(page);

  /**
   * Initialize the puppeteer browser instance and keep it running until we finish what needs to be done
   */
  async function initialize() {
    const browser = await puppeteer.launch({
      headless: false,
      defaultViewport: { width: 900, height: 900 },
    });

    const openedPages = await browser.pages();
    const page = openedPages[0];
    await page.goto(INSTAGRAM_HOST);
    await page.waitForNetworkIdle();

    return [page, browser] as const;
  }

  /**
   * Logs the user into Instagram so we can start interacting with the page.
   */
  async function login(page: Page) {
    await page.type("input[name=username]", username);
    await page.type("input[name=password]", password);

    await page.click("button[type=submit]");

    await page.waitForNetworkIdle();
    const handles = await page.$$("a");

    await handles[0].click();
    await page.waitForNetworkIdle();
    const buttons = await page.$$("button");

    for (const button of buttons) {
      const value = await page.evaluate((button) => button.textContent, button);
      if (value === "Not Now") {
        await button.click();
        break;
      }
    }
  }

  async function followTheUsersBack() {
    const page = await browser.newPage();
    await page.goto(INSTAGRAM_HOST + username + "/followers/");
    await page.waitForNetworkIdle();
    const buttons = await page.$$("button");
    for (const button of buttons) {
      const valueOfPreviousSibling = await page.evaluate(
        (button) => button?.previousSibling?.textContent || "",
        button
      );
      if (valueOfPreviousSibling === "·") await button.click();
    }

    // TODO: Probably there is scroll and pagination, need to check on that.
    page.close();
  }

  async function extractStories() {
    
  }

  async function close() {
    await browser.close();
  }

  return {
    close,
    followTheUsersBack,
  };
}