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

import { GLTF_APPEARANCE_PNG } from "../test-fixtures/gltf-appearance-fixtures";
import { decodeToolcraftModelAppearanceDataUri } from "./model-appearance-data-uri";

function dataUri(bytes: Uint8Array): string {
  let binary = "";
  for (const byte of bytes) binary += String.fromCharCode(byte);
  return `data:image/png;base64,${btoa(binary)}`;
}

describe("model appearance data URI", () => {
  it("decodes canonical base64 without browser image APIs", () => {
    expect(
      decodeToolcraftModelAppearanceDataUri(
        dataUri(GLTF_APPEARANCE_PNG),
        GLTF_APPEARANCE_PNG.byteLength,
      ),
    ).toEqual({
      bytes: GLTF_APPEARANCE_PNG,
      kind: "decoded",
      mimeType: "image/png",
    });
  });

  it("distinguishes invalid, oversized, and non-data sources", () => {
    expect(decodeToolcraftModelAppearanceDataUri("mesh.png", 1)).toEqual({
      kind: "not-data",
    });
    expect(
      decodeToolcraftModelAppearanceDataUri("data:image/png;base64,AA=A", 10),
    ).toEqual({ kind: "invalid" });
    expect(
      decodeToolcraftModelAppearanceDataUri("data:image/png;base64,AB==", 10),
    ).toEqual({ kind: "invalid" });
    expect(
      decodeToolcraftModelAppearanceDataUri(dataUri(GLTF_APPEARANCE_PNG), 1),
    ).toEqual({
      byteLength: GLTF_APPEARANCE_PNG.byteLength,
      kind: "too-large",
    });
  });
});