require("dotenv").config();

const path = require("node:path");
const fs = require("node:fs/promises");
const { chromium } = require("playwright");

const DEFAULT_URL = "https://bikegear.in/acerbis";
const TEST_URL = process.argv[2] || process.env.BIKEGEAR_PROXY_TEST_URL || DEFAULT_URL;
const WARM_URL = process.env.BIKEGEAR_PROXY_TEST_WARM_URL || DEFAULT_URL;
const PROFILE_PATH = path.resolve("data/sources/bikegear/.browser-profile-test");

const STEALTH_SCRIPT = `
  (() => {
    Object.defineProperty(navigator, 'webdriver', { get: () => false });
    const fakePlugin = (name, file, mimes) => {
      const p = Object.create(Plugin.prototype);
      Object.defineProperty(p, 'name', { get: () => name });
      Object.defineProperty(p, 'filename', { get: () => file });
      Object.defineProperty(p, 'length', { get: () => mimes.length });
      return p;
    };
    Object.defineProperty(navigator, 'plugins', {
      get: () => [
        fakePlugin('Chrome PDF Plugin', 'internal-pdf-viewer', ['application/x-google-chrome-pdf']),
        fakePlugin('Chrome PDF Viewer', 'mhjfbmdgcfjbbpaeojofohoefgiehjai', ['application/pdf']),
        fakePlugin('Native Client', 'internal-nacl-plugin', ['application/x-nacl']),
      ],
    });
    if (!window.chrome) window.chrome = { runtime: {}, loadTimes: () => {}, csi: () => {}, app: {} };
    Object.defineProperty(navigator, 'languages', { get: () => ['en-US', 'en'] });
  })();
`;

function getProxyUrl() {
  if (process.env.BIKEGEAR_PROXY_URL) {
    return process.env.BIKEGEAR_PROXY_URL;
  }

  const host = process.env.BIKEGEAR_PROXY_HOST;
  const port = process.env.BIKEGEAR_PROXY_PORT;
  if (!host || !port) {
    return null;
  }

  const protocol = String(process.env.BIKEGEAR_PROXY_PROTOCOL || "http").replace(/:$/, "");
  const username = buildWebshareUsername(process.env.BIKEGEAR_PROXY_USERNAME || "");
  const password = process.env.BIKEGEAR_PROXY_PASSWORD || "";
  const auth = username
    ? `${encodeURIComponent(username)}:${encodeURIComponent(password)}@`
    : "";

  return `${protocol}://${auth}${host}:${port}`;
}

function buildWebshareUsername(baseUsername) {
  const username = String(baseUsername || "").trim();
  if (!username) return "";

  const country = String(process.env.BIKEGEAR_PROXY_COUNTRY || "").trim().toLowerCase();
  const sessionId = String(process.env.BIKEGEAR_PROXY_SESSION_ID || "").trim();
  if (!country && !sessionId) return username;

  const countryPart = country && !new RegExp(`-${country}(?:-|$)`, "i").test(username)
    ? `-${country}`
    : "";
  const sessionPart = sessionId && !new RegExp(`-${sessionId}$`).test(username)
    ? `-${sessionId}`
    : "";

  return `${username}${countryPart}${sessionPart}`;
}

function maskProxyUrl(proxyUrl) {
  if (!proxyUrl) return "none";
  try {
    const u = new URL(proxyUrl);
    return `${u.protocol}//${u.username ? "<redacted>@" : ""}${u.host}`;
  } catch {
    return "<invalid proxy url>";
  }
}

function buildProxyOptions(proxyUrl) {
  if (!proxyUrl) return {};
  const u = new URL(proxyUrl);
  return {
    proxy: {
      server: `${u.protocol}//${u.host}`,
      ...(u.username
        ? {
          username: decodeURIComponent(u.username),
          password: decodeURIComponent(u.password),
        }
        : {}),
    },
  };
}

async function main() {
  const proxyUrl = getProxyUrl();
  await fs.mkdir(PROFILE_PATH, { recursive: true });

  console.log(`[BIKEGEAR-PROXY-TEST] url=${TEST_URL}`);
  console.log(`[BIKEGEAR-PROXY-TEST] warmUrl=${TEST_URL === WARM_URL ? "-" : WARM_URL}`);
  console.log(`[BIKEGEAR-PROXY-TEST] proxy=${maskProxyUrl(proxyUrl)}`);

  const context = await chromium.launchPersistentContext(PROFILE_PATH, {
    headless: true,
    args: [
      "--no-sandbox",
      "--disable-setuid-sandbox",
      "--disable-blink-features=AutomationControlled",
    ],
    userAgent: "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36",
    locale: "en-US",
    viewport: { width: 1280, height: 800 },
    extraHTTPHeaders: { "Accept-Language": "en-US,en;q=0.9" },
    ...buildProxyOptions(proxyUrl),
  });

  try {
    await context.addInitScript(STEALTH_SCRIPT);
    const page = await context.newPage();

    if (TEST_URL !== WARM_URL) {
      const warmResponse = await page.goto(WARM_URL, { waitUntil: "domcontentloaded", timeout: 45000 });
      await page.waitForTimeout(8000);
      console.log(`[BIKEGEAR-PROXY-TEST] warmStatus=${warmResponse?.status() || 0}`);
    }

    let response;
    if (TEST_URL !== WARM_URL && !TEST_URL.includes("?page=")) {
      response = await clickLinkForUrl(page, TEST_URL);
    }
    if (!response) {
      response = await page.goto(TEST_URL, {
        waitUntil: "domcontentloaded",
        timeout: 45000,
        ...(TEST_URL !== WARM_URL ? { referer: WARM_URL } : {}),
      });
    }
    await page.waitForTimeout(8000);

    const status = response?.status() || 0;
    const title = await page.title().catch(() => "");
    const html = await page.content();
    const productLinks = (html.match(/class="product-img/g) || []).length;
    const hasChallengeTitle = /just a moment|attention required|access denied/i.test(title);
    const hasChallengeMarkup = /cf-error|cf-browser-verification/i.test(html);
    const hasCloudflare = hasChallengeTitle || hasChallengeMarkup;

    console.log(`[BIKEGEAR-PROXY-TEST] status=${status}`);
    console.log(`[BIKEGEAR-PROXY-TEST] title=${title || "-"}`);
    console.log(`[BIKEGEAR-PROXY-TEST] productLinks=${productLinks}`);
    console.log(`[BIKEGEAR-PROXY-TEST] cloudflarePage=${hasCloudflare}`);

    if (status === 200 && productLinks > 0 && !hasChallengeTitle) {
      console.log("[BIKEGEAR-PROXY-TEST] PASS browser can read BikeGear listing through this proxy.");
      return;
    }

    process.exitCode = 1;
    console.error("[BIKEGEAR-PROXY-TEST] FAIL proxy/browser did not reach a usable BikeGear listing.");
  } finally {
    await context.close().catch(() => {});
  }
}

async function clickLinkForUrl(page, url) {
  const navigationPromise = page.waitForNavigation({ waitUntil: "domcontentloaded", timeout: 45000 })
    .catch(() => null);
  const clicked = await page.evaluate((targetUrl) => {
    const links = Array.from(document.querySelectorAll("a[href]"));
    const link = links.find((a) => a.href === targetUrl);
    if (!link) return false;
    link.click();
    return true;
  }, url).catch(() => false);

  if (!clicked) return null;
  await page.waitForURL(url, { timeout: 45000 }).catch(() => {});
  return navigationPromise;
}

main().catch((error) => {
  process.exitCode = 1;
  console.error(`[BIKEGEAR-PROXY-TEST] ERROR ${error.message}`);
});