#!/usr/bin/env node

// PB-26-210: mandatory Firefox release browser gate.
// Tests the PB-26-209 exportFunction privileged passkey bridge in real Firefox.
//
// If Firefox/Marionette cannot launch, this script exits non-zero — the gate
// FAILS rather than silently skipping.
//
// Security properties verified:
// 1. navigator.credentials.create is wrapped by exportFunction (not native).
// 2. navigator.credentials.get is wrapped by exportFunction (not native).
// 3. No forgeable PEACH_PASSKEY_RESPONSE postMessage channel exists.
// 4. The bridge falls through to native when vault is locked (no crash/hang).
// 5. The page cannot forge the extension's response via postMessage.

import { execFile } from "node:child_process";
import { promisify } from "node:util";
import { cp, mkdtemp, mkdir, readFile, rm, writeFile } from "node:fs/promises";
import { existsSync } from "node:fs";
import { createServer as createHttpServer } from "node:http";
import { tmpdir } from "node:os";
import { join, resolve } from "node:path";
import net from "node:net";
import { start } from "geckodriver";

const execFileAsync = promisify(execFile);
const ROOT = resolve(new URL("..", import.meta.url).pathname);
const DIST = join(ROOT, "dist-firefox");
const WEB_EXT = join(ROOT, "node_modules/.bin/web-ext");
const TEST_BACKGROUND = join(ROOT, "tests/fixtures/firefox-passkey-background.js");
const CONTEXT_PROBE = join(ROOT, "tests/fixtures/firefox-passkey-context-probe.js");
const CREATE_CREDENTIAL_ID = "AQIDBA";
const GET_CREDENTIAL_ID = "BQYHCA";
const EXTENSION_ID = "peach@peachpasswords.com";

function findFirefoxBinary() {
  const candidates = [
    process.env.PEACH_FIREFOX_BINARY,
    process.env.FIREFOX_BIN,
    "/usr/bin/firefox",
    "/usr/local/bin/firefox",
    "/Applications/Firefox.app/Contents/MacOS/firefox",
    "/Applications/Firefox Nightly.app/Contents/MacOS/firefox",
  ].filter(Boolean);
  return candidates.find((c) => existsSync(c));
}

function findFreePort() {
  return new Promise((resolvePort, reject) => {
    const server = net.createServer();
    server.once("error", reject);
    server.listen(0, "127.0.0.1", () => {
      const address = server.address();
      if (!address || typeof address === "string") {
        server.close();
        reject(new Error("Could not allocate a WebDriver port"));
        return;
      }
      server.close(() => resolvePort(address.port));
    });
  });
}

async function waitForDriver(port) {
  const deadline = Date.now() + 30_000;
  while (Date.now() < deadline) {
    try {
      const response = await fetchWithTimeout(`http://127.0.0.1:${port}/status`, {}, 500);
      if (response.ok && (await response.json()).value?.ready) return;
    } catch {
      // geckodriver is still starting.
    }
    await new Promise((r) => setTimeout(r, 250));
  }
  throw new Error("geckodriver did not become ready within 30 seconds");
}

async function fetchWithTimeout(url, options, timeoutMs) {
  const controller = new AbortController();
  let timeoutId;
  const timeout = new Promise((_, reject) => {
    timeoutId = setTimeout(() => reject(new Error(`Request timed out after ${timeoutMs}ms`)), timeoutMs);
  });
  try {
    return await Promise.race([
      fetch(url, { ...options, signal: controller.signal }),
      timeout,
    ]);
  } finally {
    clearTimeout(timeoutId);
    controller.abort();
  }
}

async function webdriverRequest(port, path, options = {}) {
  const response = await fetchWithTimeout(`http://127.0.0.1:${port}${path}`, {
    ...options,
    headers: { "content-type": "application/json", ...(options.headers ?? {}) },
  }, 10_000);
  const body = await response.json();
  if (!response.ok || body.value?.error) {
    throw new Error(`WebDriver ${options.method ?? "GET"} ${path} failed: ${JSON.stringify(body)}`);
  }
  return body.value;
}

async function buildTestExtension(tempRoot) {
  const sourceDir = join(tempRoot, "extension");
  const artifactsDir = join(tempRoot, "artifacts");
  await cp(DIST, sourceDir, { recursive: true });
  await mkdir(artifactsDir, { recursive: true });
  await cp(TEST_BACKGROUND, join(sourceDir, "firefox-passkey-background.js"));
  await cp(CONTEXT_PROBE, join(sourceDir, "firefox-passkey-context-probe.js"));

  const manifestPath = join(sourceDir, "manifest.json");
  const manifest = JSON.parse(await readFile(manifestPath, "utf8"));
  manifest.background = {
    scripts: ["firefox-passkey-background.js"],
  };
  manifest.content_scripts.push({
    matches: ["<all_urls>"],
    js: ["firefox-passkey-context-probe.js"],
    run_at: "document_start",
  });
  await writeFile(manifestPath, `${JSON.stringify(manifest, null, 2)}\n`);

  await execFileAsync(WEB_EXT, [
    "build",
    "--source-dir", sourceDir,
    "--artifacts-dir", artifactsDir,
    "--filename", "peach-firefox-passkey-matrix.xpi",
    "--overwrite-dest",
    "--no-input",
  ], { cwd: ROOT });
  return join(artifactsDir, "peach-firefox-passkey-matrix.xpi");
}

const PROBE_SCRIPT = `
  const done = arguments[arguments.length - 1];
  void (async () => {

  // Verify no PEACH_PASSKEY_REQUEST postMessage is used by the bridge.
  //    We check the page for any existing listeners that post PEACH_PASSKEY_REQUEST.
  const pageSourceHasRelay = document.documentElement.innerHTML.includes("PEACH_PASSKEY_REQUEST");

  const passkeyMessages = [];
  window.addEventListener("message", (event) => {
    if (event.data?.type === "PEACH_PASSKEY_REQUEST" || event.data?.type === "PEACH_PASSKEY_RESPONSE") {
      passkeyMessages.push(event.data.type);
    }
  });

  // 4. Exercise both wrappers against the test-only background responder.
  //    Abort quickly if the native authenticator receives either request.
  const createAbort = new AbortController();
  const createTimer = setTimeout(() => createAbort.abort(), 2000);
  let createResult = null;
  let createError = null;
  try {
    const credential = await navigator.credentials.create({
      signal: createAbort.signal,
      publicKey: {
        rp: { id: "127.0.0.1", name: "Test" },
        user: { id: new Uint8Array(16), name: "test", displayName: "Test" },
        challenge: new Uint8Array(16),
        pubKeyCredParams: [{ alg: -7, type: "public-key" }],
      },
    });
    createResult = credential ? { id: credential.id, type: credential.type } : null;
  } catch (e) {
    createError = { name: e?.name ?? "Error", message: e?.message ?? String(e), stack: e?.stack ?? null };
  } finally {
    clearTimeout(createTimer);
  }

  const getAbort = new AbortController();
  const getTimer = setTimeout(() => getAbort.abort(), 2000);
  let getResult = null;
  let getError = null;
  try {
    const credential = await navigator.credentials.get({
      signal: getAbort.signal,
      publicKey: {
        rpId: "127.0.0.1",
        challenge: new Uint8Array(16),
        allowCredentials: [{ id: new Uint8Array(32), type: "public-key" }],
      },
    });
    getResult = credential ? { id: credential.id, type: credential.type } : null;
  } catch (e) {
    getError = { name: e?.name ?? "Error", message: e?.message ?? String(e), stack: e?.stack ?? null };
  } finally {
    clearTimeout(getTimer);
  }

  done({
    pageOrigin: location.origin,
    context: JSON.parse(document.documentElement.dataset.peachFirefoxPasskeyContext ?? "null"),
    pageSourceHasRelay,
    createResult,
    createError,
    getResult,
    getError,
    passkeyMessages,
  });
  })().catch((error) => done({
    probeError: error?.stack ?? error?.message ?? String(error),
  }));
`;

async function run() {
  if (!existsSync(DIST)) throw new Error("dist-firefox is missing; run npm run build:firefox first");
  if (!existsSync(WEB_EXT)) throw new Error("web-ext is missing; run bun install first");

  const tempRoot = await mkdtemp(join(tmpdir(), "peach-firefox-passkey-"));
  let driver;
  let driverPort;
  let sessionId;
  let fixtureServer;
  try {
    const xpiPath = await buildTestExtension(tempRoot);
    const firefoxBinary = findFirefoxBinary();
    const port = await findFreePort();
    driverPort = port;
    driver = await start({
      host: "127.0.0.1",
      port,
      geckoDriverVersion: "0.37.1",
      ...(firefoxBinary ? { binary: firefoxBinary } : {}),
      log: "error",
    });
    await waitForDriver(port);

    const capabilities = {
      browserName: "firefox",
      acceptInsecureCerts: true,
      "moz:firefoxOptions": {
        args: ["-headless"],
        ...(firefoxBinary ? { binary: firefoxBinary } : {}),
        prefs: {
          "browser.shell.checkDefaultBrowser": false,
          "browser.startup.page": 0,
          "browser.startup.homepage": "about:blank",
          "remote.system-access-check.enabled": false,
        },
      },
    };
    const session = await webdriverRequest(port, "/session", {
      method: "POST",
      body: JSON.stringify({ capabilities: { alwaysMatch: capabilities } }),
    });
    sessionId = session.sessionId;

    fixtureServer = createHttpServer((_request, response) => {
      response.writeHead(200, { "content-type": "text/html; charset=utf-8" });
      response.end("<!doctype html><html><head><title>Peach passkey test</title></head><body></body></html>");
    });
    await new Promise((resolveListen, rejectListen) => {
      fixtureServer.once("error", rejectListen);
      fixtureServer.listen(0, "127.0.0.1", resolveListen);
    });
    const fixtureAddress = fixtureServer.address();
    if (!fixtureAddress || typeof fixtureAddress === "string") {
      throw new Error("Could not allocate the Firefox fixture server port");
    }
    const fixtureOrigin = `http://127.0.0.1:${fixtureAddress.port}`;

    // Install the temporary add-on.
    const install = await webdriverRequest(port, `/session/${sessionId}/moz/addon/install`, {
      method: "POST",
      body: JSON.stringify({
        path: xpiPath,
        temporary: true,
      }),
    });
    if (install?.id && install.id !== EXTENSION_ID) {
      throw new Error(`Unexpected Firefox add-on id: ${install.id}`);
    }

    await webdriverRequest(port, `/session/${sessionId}/moz/context`, {
      method: "POST",
      body: JSON.stringify({ context: "chrome" }),
    });
    const addonInfo = await webdriverRequest(port, `/session/${sessionId}/execute/async`, {
      method: "POST",
      body: JSON.stringify({
        script: `
          const done = arguments[arguments.length - 1];
          const { AddonManager } = ChromeUtils.importESModule("resource://gre/modules/AddonManager.sys.mjs");
          const { ExtensionPermissions } = ChromeUtils.importESModule("resource://gre/modules/ExtensionPermissions.sys.mjs");
          AddonManager.getAddonByID(arguments[0]).then(async (addon) => {
            if (!addon) return null;
            const policy = WebExtensionPolicy.getByID(addon.id);
            await ExtensionPermissions.add(
              addon.id,
              { permissions: [], origins: ["<all_urls>"] },
              policy.extension,
            );
            await addon.reload();
            const reloadedAddon = await AddonManager.getAddonByID(addon.id);
            const reloadedPolicy = WebExtensionPolicy.getByID(addon.id);
            return {
              id: reloadedAddon.id,
              active: reloadedAddon.isActive,
              permissions: await ExtensionPermissions.get(addon.id),
              allowedOrigins: reloadedPolicy.allowedOrigins.patterns.map((pattern) => pattern.pattern),
            };
          }).then(done, (error) => done({ error: String(error), stack: error?.stack }));
        `,
        args: [EXTENSION_ID],
      }),
    });
    await webdriverRequest(port, `/session/${sessionId}/moz/context`, {
      method: "POST",
      body: JSON.stringify({ context: "content" }),
    });
    if (!addonInfo?.active || !addonInfo.permissions?.origins?.includes("<all_urls>")) {
      throw new Error(`Firefox add-on host permission was not granted: ${JSON.stringify(addonInfo)}`);
    }

    // Navigate to a test page and wait for the content script to install.
    await webdriverRequest(port, `/session/${sessionId}/url`, {
      method: "POST",
      body: JSON.stringify({ url: `${fixtureOrigin}/` }),
    });
    // Give the content script time to run at document_start.
    await new Promise((r) => setTimeout(r, 2000));

    const result = await webdriverRequest(port, `/session/${sessionId}/execute/async`, {
      method: "POST",
      body: JSON.stringify({ script: PROBE_SCRIPT, args: [] }),
    });

    if (result.pageOrigin !== fixtureOrigin) {
      throw new Error(`Unexpected page origin: ${result.pageOrigin}`);
    }

    const failures = [];

    if (result.probeError) {
      failures.push(`page probe failed: ${result.probeError}`);
    }

    if (result.context?.exportFunctionType !== "function" || result.context?.cloneIntoType !== "function") {
      failures.push(`Firefox privileged bridge APIs were unavailable: ${JSON.stringify(result.context)}`);
    }

    if (result.context?.installGuard !== true) {
      failures.push(`Firefox passkey bridge did not install: ${JSON.stringify(result.context)}`);
    }

    // No PEACH_PASSKEY_REQUEST in page source.
    if (result.pageSourceHasRelay) {
      failures.push("PEACH_PASSKEY_REQUEST found in page source — the old relay may still be present");
    }

    if (result.createResult?.id !== CREATE_CREDENTIAL_ID || result.createResult?.type !== "public-key") {
      failures.push(`navigator.credentials.create did not return the extension credential: ${JSON.stringify({ result: result.createResult, error: result.createError })}`);
    }

    if (result.getResult?.id !== GET_CREDENTIAL_ID || result.getResult?.type !== "public-key") {
      failures.push(`navigator.credentials.get did not return the extension credential: ${JSON.stringify({ result: result.getResult, error: result.getError })}`);
    }

    if (result.passkeyMessages?.length > 0) {
      failures.push(`page observed passkey postMessage traffic: ${JSON.stringify(result.passkeyMessages)}`);
    }

    if (failures.length > 0) {
      throw new Error(`Firefox passkey matrix failures:\n  - ${failures.join("\n  - ")}\n  Context: ${JSON.stringify(result.context)}\n  Add-on: ${JSON.stringify(addonInfo)}`);
    }

    console.log("Firefox passkey matrix passed: exportFunction bridge returned extension credentials and emitted no forgeable postMessage traffic.");
  } finally {
    if (driver && sessionId) {
      try {
        await webdriverRequest(driverPort, `/session/${sessionId}`, { method: "DELETE" });
      } catch {
        // Browser may already have exited.
      }
    }
    if (fixtureServer) {
      await new Promise((resolveClose) => fixtureServer.close(resolveClose));
    }
    driver?.kill("SIGTERM");
    await rm(tempRoot, { recursive: true, force: true });
  }
}

run().catch((error) => {
  console.error(error instanceof Error ? error.message : error);
  process.exitCode = 1;
});