/**
 * The P1/A1 camera in the real web console, in a real Chrome, for
 * scripts/e2e-camera-snapshot.sh (BROWSER=1). Signs in the same way as
 * e2e-camera-browser.ts. Reads pixel statistics and keeps no screenshot: the
 * frame is the inside of someone's workshop.
 *
 * Results are `ok<TAB>label` / `FAILED<TAB>label`.
 * Environment: APP_URL, SUPABASE_E2E_EMAIL, SUPABASE_E2E_PASSWORD, CHROME_BIN.
 */
import puppeteer from "puppeteer-core";

const appUrl = process.env.APP_URL!;
const email = process.env.SUPABASE_E2E_EMAIL!;
const password = process.env.SUPABASE_E2E_PASSWORD!;
const chromeBin = process.env.CHROME_BIN ?? "/usr/bin/google-chrome";

let failed = false;
const say = (good: boolean, label: string, detail = "") => {
  if (!good) failed = true;
  console.log(`${good ? "ok" : "FAILED"}\t${label}${detail ? ` (${detail})` : ""}`);
};

const browser = await puppeteer.launch({
  executablePath: chromeBin,
  headless: true,
  args: ["--no-sandbox", "--disable-dev-shm-usage"],
});

try {
  const page = await browser.newPage();
  const pageErrors: string[] = [];
  page.on("pageerror", (err) => pageErrors.push(String((err as Error).message ?? err).slice(0, 160)));

  await page.goto(`${appUrl}/login`, { waitUntil: "domcontentloaded", timeout: 120_000 });
  await page.waitForFunction(
    () => typeof (window as any).useNuxtApp === "function" && Boolean((window as any).useNuxtApp().$supabase),
    { timeout: 120_000 },
  );
  const signInError = await page.evaluate(
    async (e: string, p: string) => {
      const { client } = (window as any).useNuxtApp().$supabase;
      const { error } = await client.auth.signInWithPassword({ email: e, password: p });
      return error ? String(error.message) : null;
    },
    email,
    password,
  );
  say(signInError === null, "the app's own Supabase client signs the user in", signInError ?? "");
  if (signInError) process.exit(1);

  await page.goto(`${appUrl}/`, { waitUntil: "domcontentloaded", timeout: 60_000 });
  const stayed = await page.waitForSelector(".fleet", { timeout: 60_000 }).then(() => true).catch(() => false);
  say(stayed && !page.url().includes("/login"), "the fleet page loads and does not bounce back to /login");

  const live = await page
    .waitForFunction(() => document.querySelector(".app-shell__status.is-online") !== null, { timeout: 30_000 })
    .then(() => true)
    .catch(() => false);
  say(live, "the header reports Live");

  const shown = await page
    .waitForFunction(() => document.querySelector(".snapshot-view__status.is-connected") !== null, { timeout: 60_000 })
    .then(() => true)
    .catch(() => false);
  const status = await page.evaluate(
    () => document.querySelector(".snapshot-view__status")?.textContent?.trim() ?? "no snapshot view rendered",
  );
  say(shown, "the snapshot view reports connected", `status: ${status}`);
  say(
    (await page.$(".webrtc-view")) === null,
    "no WebRTC player is rendered for a snapshot camera",
  );

  if (shown) {
    // Two different frames, a few seconds apart: the picture is refreshing.
    const result = await page.evaluate(async () => {
      const img = document.querySelector<HTMLImageElement>(".snapshot-view img")!;
      const first = img.src;
      const t0 = Date.now();
      while (img.src === first && Date.now() - t0 < 15_000) await new Promise((r) => setTimeout(r, 250));
      const refreshed = img.src !== first;
      const canvas = document.createElement("canvas");
      canvas.width = 64;
      canvas.height = 36;
      const ctx = canvas.getContext("2d")!;
      ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
      const px = ctx.getImageData(0, 0, canvas.width, canvas.height).data;
      let sum = 0;
      let sumSq = 0;
      const n = px.length / 4;
      for (let i = 0; i < px.length; i += 4) {
        const y = 0.299 * px[i] + 0.587 * px[i + 1] + 0.114 * px[i + 2];
        sum += y;
        sumSq += y * y;
      }
      const mean = sum / n;
      return {
        refreshed,
        width: img.naturalWidth,
        height: img.naturalHeight,
        mean,
        stdev: Math.sqrt(Math.max(0, sumSq / n - mean * mean)),
      };
    });
    say(result.width > 0, "Chrome decoded the JPEG", `${result.width}x${result.height}`);
    say(result.refreshed, "the picture refreshes by itself");
    say(result.stdev > 2, "the frame has picture content, not black or one flat colour",
      `mean luma ${result.mean.toFixed(0)}, stdev ${result.stdev.toFixed(1)}`);
  }

  say(pageErrors.length === 0, "the page raised no uncaught errors", pageErrors.slice(0, 2).join(" | "));
} finally {
  await browser.close();
}

process.exit(failed ? 1 : 0);