import {
  isCoarsePointer,
  isLowPowerDevice,
  isMobileViewport,
  isSaveData,
  isSoftwareRenderer,
  isSoftwareWebGL,
  MOBILE_QUERY,
} 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;
});

describe("device hints", () => {
  it("treats a capable desktop as full power", () => {
    expect(isLowPowerDevice()).toBe(false);
    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([
    ["a touch pointer", () => mockMedia(["(pointer: coarse)"])],
    ["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 })],
  ])("is low power with %s", (_label, arrange) => {
    arrange();
    expect(isLowPowerDevice()).toBe(true);
  });

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

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

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);
  });
});