import {
  isCoarsePointer,
  isKnownSlowScene,
  isKnownSoftwareWebGL,
  isMobileViewport,
  isSaveData,
  isSoftwareRenderer,
  isSoftwareWebGL,
  isWebKit,
  MOBILE_QUERY,
  rememberSlowScene,
  rememberSoftwareWebGL,
  sceneTier,
} from "./device";

const originalMatchMedia = window.matchMedia;

function mockMedia(active: string[]) {
  window.matchMedia = jest.fn().mockImplementation((query: string) => ({
    matches: active.includes(query),
    media: query,
    addEventListener() {},
    removeEventListener() {},
  }));
}

function mockNavigator(values: Record<string, unknown>) {
  for (const [key, value] of Object.entries(values))
    Object.defineProperty(navigator, key, { configurable: true, value });
}

beforeEach(() => {
  mockMedia([]);
  mockNavigator({
    hardwareConcurrency: 8,
    deviceMemory: undefined,
    connection: undefined,
  });
});

afterEach(() => {
  window.matchMedia = originalMatchMedia;
});

const TOUCH = "(pointer: coarse)";

describe("device hints", () => {
  it("treats a capable desktop as full power", () => {
    expect(sceneTier()).toBe("full");
    expect(isCoarsePointer()).toBe(false);
    expect(isSaveData()).toBe(false);
    expect(isMobileViewport()).toBe(false);
  });

  it("reads the phone breakpoint from the shared query", () => {
    mockMedia([MOBILE_QUERY]);
    expect(isMobileViewport()).toBe(true);
    expect(MOBILE_QUERY).toBe("(max-width: 767px)");
  });

  it.each([
    ["reduced motion", () => mockMedia(["(prefers-reduced-motion: reduce)"])],
    ["the data saver", () => mockNavigator({ connection: { saveData: true } })],
    ["four cores", () => mockNavigator({ hardwareConcurrency: 4 })],
    ["two cores", () => mockNavigator({ hardwareConcurrency: 2 })],
    ["4 GB of memory", () => mockNavigator({ deviceMemory: 4 })],
    ["2 GB of memory", () => mockNavigator({ deviceMemory: 2 })],
  ])("shows only the poster with %s", (_label, arrange) => {
    arrange();
    expect(sceneTier()).toBe("static");
  });

  it("does not penalize a browser that hides the hardware hints", () => {
    mockNavigator({ hardwareConcurrency: undefined, deviceMemory: undefined });
    expect(sceneTier()).toBe("full");
  });

  it("keeps 8 GB and 6 cores on the full path", () => {
    mockNavigator({ hardwareConcurrency: 6, deviceMemory: 8 });
    expect(sceneTier()).toBe("full");
  });
});

describe("sceneTier(): one case per row of the decision table", () => {
  it("row 1: no navigator (server) -> static", () => {
    const original = Object.getOwnPropertyDescriptor(globalThis, "navigator");
    Object.defineProperty(globalThis, "navigator", {
      configurable: true,
      value: undefined,
    });
    try {
      expect(sceneTier()).toBe("static");
    } finally {
      if (original) Object.defineProperty(globalThis, "navigator", original);
      else Reflect.deleteProperty(globalThis, "navigator");
    }
  });

  it.each([
    ["reduced motion", [TOUCH, "(prefers-reduced-motion: reduce)"], {}],
    ["the data saver", [TOUCH], { connection: { saveData: true } }],
  ])("row 2: a capable phone with %s -> static", (_label, media, hints) => {
    mockMedia(media);
    mockNavigator({ hardwareConcurrency: 8, deviceMemory: 8, ...hints });
    expect(sceneTier()).toBe("static");
  });

  it("row 3: 4 cores with plenty of memory -> static even with a mouse", () => {
    mockNavigator({ hardwareConcurrency: 4, deviceMemory: 8 });
    expect(sceneTier()).toBe("static");
  });

  it.each([
    ["8 cores and 4 GB", { hardwareConcurrency: 8, deviceMemory: 4 }, "lite"],
    ["8 cores and 2 GB", { hardwareConcurrency: 8, deviceMemory: 2 }, "static"],
    ["5 cores", { hardwareConcurrency: 5 }, "static"],
    ["6 cores and 4 GB", { hardwareConcurrency: 6, deviceMemory: 4 }, "lite"],
    [
      "no hints reported",
      { hardwareConcurrency: undefined, deviceMemory: undefined },
      "lite",
    ],
  ])("row 4: touch with %s -> %s", (_label, hints, tier) => {
    mockMedia([TOUCH]);
    mockNavigator(hints);
    expect(sceneTier()).toBe(tier);
  });

  it.each([
    ["8 cores and 4 GB", { hardwareConcurrency: 8, deviceMemory: 4 }, "static"],
    ["8 cores and 8 GB", { hardwareConcurrency: 8, deviceMemory: 8 }, "full"],
    ["5 cores and no memory hint", { hardwareConcurrency: 5 }, "full"],
  ])("row 5: mouse with %s -> %s", (_label, hints, tier) => {
    mockNavigator(hints);
    expect(sceneTier()).toBe(tier);
  });
});

describe("software WebGL", () => {
  it.each([
    "ANGLE (Google, Vulkan 1.3.0 (SwiftShader Device (Subzero) (0x0000C0DE)), SwiftShader driver)",
    "llvmpipe (LLVM 15.0.7, 256 bits)",
    "ANGLE (Microsoft, Microsoft Basic Render Driver (0x0000008C) Direct3D11 vs_5_0 ps_5_0, D3D11)",
    "SWIFTSHADER",
  ])("recognizes the software renderer %s", (name) => {
    expect(isSoftwareRenderer(name)).toBe(true);
  });

  it.each([
    "ANGLE (NVIDIA, NVIDIA GeForce RTX 3060 (0x00002504) Direct3D11 vs_5_0 ps_5_0, D3D11)",
    "ANGLE (Apple, ANGLE Metal Renderer: Apple M2, Unspecified Version)",
    "Mesa Intel(R) UHD Graphics 620 (KBL GT2)",
    "",
  ])("does not mistake the GPU %s for software", (name) => {
    expect(isSoftwareRenderer(name)).toBe(false);
  });

  /** Um contexto WebGL de mentira: a extensão de depuração e o nome do renderizador. */
  function context(renderer: unknown, hasExtension = true) {
    return {
      getExtension: jest.fn((name: string) =>
        hasExtension && name === "WEBGL_debug_renderer_info"
          ? { UNMASKED_RENDERER_WEBGL: 37446 }
          : null,
      ),
      getParameter: jest.fn((parameter: number) =>
        parameter === 37446 ? renderer : null,
      ),
    } as unknown as WebGL2RenderingContext;
  }

  it("reads the unmasked renderer through WEBGL_debug_renderer_info", () => {
    expect(isSoftwareWebGL(context("llvmpipe (LLVM 15.0.7, 256 bits)"))).toBe(
      true,
    );
    expect(isSoftwareWebGL(context("ANGLE (NVIDIA GeForce RTX 3060)"))).toBe(
      false,
    );
  });

  it("does not count against a browser that hides the extension or returns no name", () => {
    expect(isSoftwareWebGL(context("llvmpipe", false))).toBe(false);
    expect(isSoftwareWebGL(context(null))).toBe(false);
  });
});

describe("the software WebGL verdict kept for the session", () => {
  beforeEach(() => sessionStorage.clear());
  afterEach(() => {
    jest.restoreAllMocks();
    sessionStorage.clear();
  });

  it("is unknown until someone remembers it, then known for the rest of the session", () => {
    expect(isKnownSoftwareWebGL()).toBe(false);

    rememberSoftwareWebGL();

    expect(isKnownSoftwareWebGL()).toBe(true);
    // fica no sessionStorage: some com a aba, e não vale para outra aparelhagem
    expect(sessionStorage.getItem("webgl-software")).toBe("1");
  });

  it("ignores any other value in the key (only the verdict this module writes counts)", () => {
    sessionStorage.setItem("webgl-software", "0");

    expect(isKnownSoftwareWebGL()).toBe(false);
  });

  it("counts a blocked sessionStorage as unknown, and remembering then does not throw", () => {
    jest.spyOn(Storage.prototype, "getItem").mockImplementation(() => {
      throw new DOMException("blocked", "SecurityError");
    });
    jest.spyOn(Storage.prototype, "setItem").mockImplementation(() => {
      throw new DOMException("blocked", "SecurityError");
    });

    expect(isKnownSoftwareWebGL()).toBe(false);
    expect(() => rememberSoftwareWebGL()).not.toThrow();
  });
});

describe("the slow scene verdict kept for the session", () => {
  beforeEach(() => sessionStorage.clear());
  afterEach(() => {
    jest.restoreAllMocks();
    sessionStorage.clear();
  });

  it("is unknown until someone remembers it, then known for the rest of the session", () => {
    expect(isKnownSlowScene()).toBe(false);

    rememberSlowScene();

    expect(isKnownSlowScene()).toBe(true);
    expect(sessionStorage.getItem("scene-slow")).toBe("1");
  });

  it("ignores any other value in the key (only the verdict this module writes counts)", () => {
    sessionStorage.setItem("scene-slow", "0");

    expect(isKnownSlowScene()).toBe(false);
  });

  it("counts a blocked sessionStorage as unknown, and remembering then does not throw", () => {
    jest.spyOn(Storage.prototype, "getItem").mockImplementation(() => {
      throw new DOMException("blocked", "SecurityError");
    });
    jest.spyOn(Storage.prototype, "setItem").mockImplementation(() => {
      throw new DOMException("blocked", "SecurityError");
    });

    expect(isKnownSlowScene()).toBe(false);
    expect(() => rememberSlowScene()).not.toThrow();
  });
});

describe("isWebKit (the only engine that needs the showcase video to play once)", () => {
  const iphone =
    "Mozilla/5.0 (iPhone; CPU iPhone OS 17_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Mobile/15E148 Safari/604.1";
  const iphoneChrome =
    "Mozilla/5.0 (iPhone; CPU iPhone OS 17_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/126.0 Mobile/15E148 Safari/604.1";
  const macSafari =
    "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15";
  const chrome =
    "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36";
  const edge = `${chrome} Edg/126.0.0.0`;
  const androidChrome =
    "Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Mobile Safari/537.36";
  const firefox =
    "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:127.0) Gecko/20100101 Firefox/127.0";

  afterEach(() => {
    mockNavigator({ platform: "", maxTouchPoints: 0 });
    Reflect.deleteProperty(navigator, "userAgent");
  });

  it.each([
    ["Safari on the iPhone", iphone],
    [
      "Chrome on the iPhone (iOS runs WebKit under every browser)",
      iphoneChrome,
    ],
    ["Safari on the Mac", macSafari],
  ])("is true for %s", (_name, userAgent) => {
    mockNavigator({ userAgent });

    expect(isWebKit()).toBe(true);
  });

  it.each([
    ["Chrome", chrome],
    ["Edge", edge],
    ["Chrome on Android", androidChrome],
    ["Firefox", firefox],
  ])("is false for %s", (_name, userAgent) => {
    mockNavigator({ userAgent });

    expect(isWebKit()).toBe(false);
  });

  it("is true for an iPad that presents itself as a Mac (a Mac with a touch screen)", () => {
    mockNavigator({
      userAgent:
        "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) Gecko/20100101",
      platform: "MacIntel",
      maxTouchPoints: 5,
    });

    expect(isWebKit()).toBe(true);
    mockNavigator({ maxTouchPoints: 0 });
    expect(isWebKit()).toBe(false);
  });
});