import { Browser, BrowserContext, Page, chromium } from "playwright";

let browser: Browser | null = null;
let context: BrowserContext | null = null;
let page: Page | null = null;

function getLaunchArgs(): string[] {
  return [
    "--no-sandbox",
    "--disable-setuid-sandbox",
    "--disable-dev-shm-usage",
    "--disable-gpu",
    "--disable-software-rasterizer",
    "--no-first-run",
    "--no-default-browser-check",
    "--disable-extensions",
    "--disable-sync",
    "--mute-audio",
    "--window-size=1280,720",
  ];
}

function ensureNodeRuntimeEnv() {
  process.env.HOME = process.env.HOME || "/home/node";
  process.env.XDG_CACHE_HOME =
    process.env.XDG_CACHE_HOME || "/home/node/.cache";
  process.env.XDG_CONFIG_HOME =
    process.env.XDG_CONFIG_HOME || "/home/node/.config";
  process.env.XDG_RUNTIME_DIR =
    process.env.XDG_RUNTIME_DIR || "/tmp/runtime-node";
  process.env.DBUS_SESSION_BUS_ADDRESS =
    process.env.DBUS_SESSION_BUS_ADDRESS || "disabled";
  process.env.PLAYWRIGHT_BROWSERS_PATH =
    process.env.PLAYWRIGHT_BROWSERS_PATH || "/home/node/.cache/ms-playwright";
}

export async function initBrowser(): Promise<void> {
  await closeBrowser();
  ensureNodeRuntimeEnv();

  console.log(`[Browser] UID       : ${process.getuid?.() ?? "unknown"}`);
  console.log(`[Browser] HOME      : ${process.env.HOME}`);
  console.log(`[Browser] PW path   : ${process.env.PLAYWRIGHT_BROWSERS_PATH}`);

  browser = await chromium.launch({
    headless: true,
    args: getLaunchArgs(),
    env: {
      ...process.env,
      HOME: process.env.HOME,
      XDG_CACHE_HOME: process.env.XDG_CACHE_HOME,
      XDG_CONFIG_HOME: process.env.XDG_CONFIG_HOME,
      XDG_RUNTIME_DIR: process.env.XDG_RUNTIME_DIR,
      DBUS_SESSION_BUS_ADDRESS: process.env.DBUS_SESSION_BUS_ADDRESS,
      PLAYWRIGHT_BROWSERS_PATH: process.env.PLAYWRIGHT_BROWSERS_PATH,
    },
  });

  context = await browser.newContext({
    viewport: { width: 1280, height: 720 },
    locale: "en-US",
    ignoreHTTPSErrors: true,
    userAgent:
      "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
  });

  context.setDefaultTimeout(10_000);
  context.setDefaultNavigationTimeout(15_000);

  page = await context.newPage();

  await page.route("**/*.{woff,woff2,ttf,otf,eot}", (route) => route.abort());

  await page.route(
    "**/{analytics,gtag,ga.js,fbq,hotjar,clarity,segment,mixpanel}*",
    (route) => route.abort()
  );

  await page.setExtraHTTPHeaders({
    "Accept-Language": "en-US,en;q=0.9",
  });

  await page.goto("about:blank", { timeout: 5_000 });

  console.log("[Browser] Ready on about:blank");
}

export async function navigateTo(url: string): Promise<void> {
  if (!page) {
    throw new Error("No active browser page");
  }

  console.log(`[Browser] Navigating to ${url}`);

  try {
    const response = await page.goto(url, {
      waitUntil: "commit",
      timeout: 15_000,
    });

    console.log("[Browser] commit ok:", response?.status() ?? "no-response");

    await page
      .waitForLoadState("domcontentloaded", { timeout: 8_000 })
      .catch(() => {});
    await page.waitForTimeout(1200);

    return;
  } catch (err) {
    console.warn("[Browser] commit failed, retrying with domcontentloaded", err);
  }

  try {
    await page.goto(url, {
      waitUntil: "domcontentloaded",
      timeout: 15_000,
    });

    console.log("[Browser] Navigation OK (domcontentloaded)");
    await page.waitForTimeout(1200);
    return;
  } catch (err) {
    console.warn("[Browser] domcontentloaded failed, waiting for body", err);
  }

  try {
    await page.waitForSelector("body", {
      timeout: 8_000,
    });

    console.log("[Browser] Body detected");
    await page.waitForTimeout(800);
    return;
  } catch {
    throw new Error(`Navigation failed for ${url}`);
  }
}

export function getPage(): Page | null {
  return page;
}

export function isBrowserAlive(): boolean {
  return !!browser && browser.isConnected() && !!context && !!page && !page.isClosed();
}

export async function closeBrowser(): Promise<void> {
  try {
    if (page && !page.isClosed()) {
      await page.close().catch(() => {});
    }
    page = null;

    if (context) {
      await context.close().catch(() => {});
    }
    context = null;

    if (browser && browser.isConnected()) {
      await browser.close().catch(() => {});
    }
    browser = null;
  } catch (e) {
    console.warn("[Browser] Close warning:", e);
    page = null;
    context = null;
    browser = null;
  } finally {
    console.log("[Browser] Session closed cleanly.");
  }
}