import {
  chapterAnchors,
  chapterFraction,
  chapterIndexAt,
  desktopFractionAt,
  getProjectVideo,
  getShowcaseAssets,
  mobileFractionAt,
  SHOWCASE,
  type ShowcaseConfig,
} from "./project-showcase";

/**
 * Testes de caminhos-base de lib/project-showcase.ts (complemento de project-showcase.test.ts):
 * getProjectVideo (id da vitrine x id fora dela x chaves herdadas de Object, nos dois aparelhos) e os trechos
 * de chapterAnchors/interpolate/chapterFraction que o arquivo principal não exercita.
 */

function config(
  chapters: ShowcaseConfig["chapters"],
  durations = { desktop: 10, mobile: 20 },
): ShowcaseConfig {
  return { id: "fixture", accent: "#fff", durations, weight: 1, chapters };
}

describe("getProjectVideo", () => {
  it.each(SHOWCASE.map(({ id }) => id))(
    "path: showcase project %s -> assets for the requested device",
    (id) => {
      expect(getProjectVideo(id, "desktop")).toEqual(
        getShowcaseAssets(id, "desktop"),
      );
      expect(getProjectVideo(id, "mobile")).toEqual(
        getShowcaseAssets(id, "mobile"),
      );
      expect(getProjectVideo(id)).toEqual(getShowcaseAssets(id, "desktop"));
    },
  );

  it.each([
    "",
    "nao-existe",
    "constructor",
    "__proto__",
    "toString",
    "SEV-MODAINTIMA",
  ])(
    "path: id %j is not a showcase project -> undefined for both devices",
    (id) => {
      expect(getProjectVideo(id)).toBeUndefined();
      expect(getProjectVideo(id, "mobile")).toBeUndefined();
    },
  );

  it("path: the two devices differ in size and in poster, not in the project folder", () => {
    const desktop = getProjectVideo("nutriscan", "desktop");
    const mobile = getProjectVideo("nutriscan", "mobile");

    expect(desktop).toMatchObject({ width: 1440, height: 900 });
    expect(mobile).toMatchObject({ width: 390, height: 844 });
    expect(desktop?.poster).toBe("/videos/nutriscan/desktop.webp");
    expect(mobile?.poster).toBe("/videos/nutriscan/mobile.webp");
  });
});

describe("chapterAnchors", () => {
  it("path: chapters that advance on both videos -> one anchor each between [0,0] and [1,1]", () => {
    const anchors = chapterAnchors(
      config([
        { label: "A", desktop: 2, mobile: 4 },
        { label: "B", desktop: 5, mobile: 10 },
      ]),
    );

    expect(anchors).toEqual([
      [0, 0],
      [0.2, 0.2],
      [0.5, 0.5],
      [1, 1],
    ]);
  });

  it("path: a chapter at second 0 on both videos -> no duplicate of the origin", () => {
    const anchors = chapterAnchors(
      config([
        { label: "Abertura", desktop: 0, mobile: 0 },
        { label: "B", desktop: 5, mobile: 10 },
      ]),
    );

    expect(anchors).toEqual([
      [0, 0],
      [0.5, 0.5],
      [1, 1],
    ]);
  });

  it("path: a chapter that does not advance on the desktop video -> skipped", () => {
    const anchors = chapterAnchors(
      config([
        { label: "A", desktop: 4, mobile: 4 },
        { label: "B", desktop: 4, mobile: 12 },
      ]),
    );

    expect(anchors).toEqual([
      [0, 0],
      [0.4, 0.2],
      [1, 1],
    ]);
  });

  it("path: a chapter that does not advance on the mobile video -> skipped", () => {
    const anchors = chapterAnchors(
      config([
        { label: "A", desktop: 4, mobile: 10 },
        { label: "B", desktop: 8, mobile: 10 },
      ]),
    );

    expect(anchors).toEqual([
      [0, 0],
      [0.4, 0.5],
      [1, 1],
    ]);
  });
});

describe("mobileFractionAt / desktopFractionAt (interpolation)", () => {
  const sample = config([
    { label: "A", desktop: 2, mobile: 10 },
    { label: "B", desktop: 8, mobile: 15 },
  ]);

  it.each([
    [-1, 0],
    [0, 0],
    [0.2, 0.5],
    [0.5, 0.5 + (0.3 / 0.6) * 0.25],
    [0.8, 0.75],
    [1, 1],
    [2, 1],
  ])(
    "path: desktop fraction %f -> mobile fraction %f",
    (fraction, expected) => {
      expect(mobileFractionAt(sample, fraction)).toBeCloseTo(expected, 9);
    },
  );

  it("path: desktopFractionAt is the inverse on the anchors", () => {
    expect(desktopFractionAt(sample, 0.5)).toBeCloseTo(0.2, 9);
    expect(desktopFractionAt(sample, 0.75)).toBeCloseTo(0.8, 9);
    expect(desktopFractionAt(sample, 0)).toBe(0);
    expect(desktopFractionAt(sample, 1)).toBe(1);
  });

  it("path: a chapter right at the end makes a zero-length span -> no division by zero", () => {
    const flat = config([{ label: "Fim", desktop: 10, mobile: 20 }]);

    expect(mobileFractionAt(flat, 1)).toBe(1);
    expect(Number.isFinite(mobileFractionAt(flat, 0.999))).toBe(true);
    expect(Number.isFinite(desktopFractionAt(flat, 1))).toBe(true);
  });
});

describe("chapterIndexAt / chapterFraction", () => {
  const sample = config([
    { label: "A", desktop: 0, mobile: 0 },
    { label: "B", desktop: 4, mobile: 8 },
    { label: "C", desktop: 8, mobile: 16 },
  ]);

  it.each([
    [-5, 0],
    [0, 0],
    [0.399, 0],
    [0.4, 1],
    [0.7999, 1],
    [0.8, 2],
    [1, 2],
    [9, 2],
  ])("path: fraction %f -> chapter %i", (fraction, expected) => {
    expect(chapterIndexAt(sample, fraction)).toBe(expected);
  });

  it("path: chapter index in range -> start fraction on each video", () => {
    expect(chapterFraction(sample, 1, "desktop")).toBeCloseTo(0.4, 9);
    expect(chapterFraction(sample, 1, "mobile")).toBeCloseTo(0.4, 9);
    expect(chapterFraction(sample, 2, "desktop")).toBeCloseTo(0.8, 9);
  });

  it.each([-1, 3, 99])(
    "path: chapter index %i does not exist -> 0",
    (index) => {
      expect(chapterFraction(sample, index, "desktop")).toBe(0);
      expect(chapterFraction(sample, index, "mobile")).toBe(0);
    },
  );
});