/**
 * browser.test.ts — locks down feature-detected browser identification.
 *
 * Why this matters for passkeys: detectBrowser() routes the entire passkey
 * code path. "chrome" picks chrome.webAuthenticationProxy. "firefox" picks
 * the content-script proxy. Both decisions must work for every Chromium
 * derivative (Brave, Edge, Vivaldi, Opera, Arc) and every Firefox derivative
 * (LibreWolf, Floorp, Waterfox) because their UAs differ but their feature
 * surfaces match the upstream browser.
 */

import { afterEach, describe, expect, it, vi } from "vitest";

import { detectBrowser, firefoxVersion } from "./browser";

type ChromeShape = Partial<{
  webAuthenticationProxy: object | undefined;
  runtime: { getURL?: (path: string) => string };
}>;

function installChrome(shape: ChromeShape | undefined) {
  if (shape === undefined) {
    (globalThis as { chrome?: unknown }).chrome = undefined;
    return;
  }
  (globalThis as { chrome?: unknown }).chrome = shape;
}

function installUserAgent(ua: string) {
  vi.stubGlobal("navigator", { userAgent: ua });
}

describe("detectBrowser", () => {
  afterEach(() => {
    vi.unstubAllGlobals();
    (globalThis as { chrome?: unknown }).chrome = undefined;
  });

  it("returns 'chrome' when chrome.webAuthenticationProxy is present", () => {
    installChrome({ webAuthenticationProxy: {}, runtime: { getURL: () => "chrome-extension://abc/" } });
    expect(detectBrowser()).toBe("chrome");
  });

  it("treats Brave (Chromium derivative) as 'chrome' — UA-independent", () => {
    installChrome({ webAuthenticationProxy: {}, runtime: { getURL: () => "chrome-extension://abc/" } });
    installUserAgent("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Brave/1.62 Chrome/122.0.0.0 Safari/537.36");
    expect(detectBrowser()).toBe("chrome");
  });

  it("treats Edge (Chromium derivative) as 'chrome'", () => {
    installChrome({ webAuthenticationProxy: {}, runtime: { getURL: () => "chrome-extension://abc/" } });
    installUserAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 Edg/122.0.0.0");
    expect(detectBrowser()).toBe("chrome");
  });

  it("treats Vivaldi (Chromium derivative) as 'chrome'", () => {
    installChrome({ webAuthenticationProxy: {}, runtime: { getURL: () => "chrome-extension://abc/" } });
    installUserAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 Vivaldi/6.5.3206.55");
    expect(detectBrowser()).toBe("chrome");
  });

  it("treats Opera (Chromium derivative) as 'chrome'", () => {
    installChrome({ webAuthenticationProxy: {}, runtime: { getURL: () => "chrome-extension://abc/" } });
    installUserAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 OPR/108.0.0.0");
    expect(detectBrowser()).toBe("chrome");
  });

  it("treats Arc (Chromium derivative) as 'chrome'", () => {
    installChrome({ webAuthenticationProxy: {}, runtime: { getURL: () => "chrome-extension://abc/" } });
    installUserAgent("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 Arc/1.30");
    expect(detectBrowser()).toBe("chrome");
  });

  it("returns 'firefox' when the extension URL scheme is moz-extension://", () => {
    installChrome({ runtime: { getURL: () => "moz-extension://abc/" } });
    expect(detectBrowser()).toBe("firefox");
  });

  it("treats LibreWolf (Firefox fork) as 'firefox' — UA-independent", () => {
    installChrome({ runtime: { getURL: () => "moz-extension://abc/" } });
    // LibreWolf preserves Firefox/N in its UA for site compatibility.
    installUserAgent("Mozilla/5.0 (X11; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0 LibreWolf/124.0");
    expect(detectBrowser()).toBe("firefox");
  });

  it("treats Floorp (Firefox fork) as 'firefox'", () => {
    installChrome({ runtime: { getURL: () => "moz-extension://abc/" } });
    installUserAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:124.0) Gecko/20100101 Firefox/124.0 Floorp/11.18");
    expect(detectBrowser()).toBe("firefox");
  });

  it("returns 'unknown' when neither webAuthenticationProxy nor moz-extension is present", () => {
    installChrome({ runtime: { getURL: () => "safari-web-extension://abc/" } });
    expect(detectBrowser()).toBe("unknown");
  });

  it("returns 'unknown' when chrome global is missing entirely (Safari, in-page contexts)", () => {
    installChrome(undefined);
    expect(detectBrowser()).toBe("unknown");
  });

  it("does not throw if runtime.getURL is missing or throws", () => {
    installChrome({ runtime: {} });
    expect(detectBrowser()).toBe("unknown");

    installChrome({
      runtime: {
        getURL: () => {
          throw new Error("not available");
        },
      },
    });
    expect(detectBrowser()).toBe("unknown");
  });
});

describe("firefoxVersion", () => {
  afterEach(() => {
    vi.unstubAllGlobals();
    (globalThis as { chrome?: unknown }).chrome = undefined;
  });

  it("returns NaN when detectBrowser is not firefox", () => {
    installChrome({ webAuthenticationProxy: {}, runtime: { getURL: () => "chrome-extension://abc/" } });
    installUserAgent("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36");
    expect(firefoxVersion()).toBeNaN();
  });

  it("parses Firefox/N from a stock Firefox UA", () => {
    installChrome({ runtime: { getURL: () => "moz-extension://abc/" } });
    installUserAgent("Mozilla/5.0 (X11; Linux x86_64; rv:150.0) Gecko/20100101 Firefox/150.0");
    expect(firefoxVersion()).toBe(150);
  });

  it("parses Firefox/N from a LibreWolf UA (preserves Firefox token)", () => {
    installChrome({ runtime: { getURL: () => "moz-extension://abc/" } });
    installUserAgent("Mozilla/5.0 (X11; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0 LibreWolf/124.0");
    expect(firefoxVersion()).toBe(124);
  });

  it("parses Firefox/N from a Floorp UA", () => {
    installChrome({ runtime: { getURL: () => "moz-extension://abc/" } });
    installUserAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:124.0) Gecko/20100101 Firefox/124.0 Floorp/11.18");
    expect(firefoxVersion()).toBe(124);
  });

  it("returns NaN when Firefox/N cannot be parsed from a UA-spoofed Firefox", () => {
    installChrome({ runtime: { getURL: () => "moz-extension://abc/" } });
    installUserAgent("Mozilla/5.0 (X11; Linux x86_64; rv:124.0) Gecko/20100101 CustomBrowser/1.0");
    expect(firefoxVersion()).toBeNaN();
  });
});