import { afterEach, describe, expect, it, vi } from "vitest";
import { perspectiveCorrectPixels } from "../../src/scan/render";
import { defaultAdjustments } from "../../src/scan/types";

class TestImageData {
  data: Uint8ClampedArray;
  width: number;
  height: number;
  constructor(width: number, height: number) {
    this.width = width;
    this.height = height;
    this.data = new Uint8ClampedArray(width * height * 4);
  }
}

describe("scan render core", () => {
  afterEach(() => vi.unstubAllGlobals());

  it("maps an identity quad without changing corner colours", () => {
    vi.stubGlobal("ImageData", TestImageData);
    const source = new TestImageData(2, 2) as unknown as ImageData;
    source.data.set([
      255, 0, 0, 255, 0, 255, 0, 255, 0, 0, 255, 255, 255, 255, 255, 255,
    ]);
    const result = perspectiveCorrectPixels(source, 2, 2, defaultAdjustments());
    expect([...result.data]).toEqual([...source.data]);
  });
});