import { describe, it, expect } from "vitest";
import { shotThumbnail, isGeneratedThumbnail } from "./shot-thumbnail";

/**
 * The whole point of the second column is that promotion can never destroy the
 * reference frame that came with the brief. These cases are that guarantee.
 */
describe("shotThumbnail", () => {
  it("prefers the reference frame over a render-derived one", () => {
    expect(
      shotThumbnail({ thumbnailUrl: "/api/files/image/ref.jpg", generatedThumbnailUrl: "/api/files/image/gen.jpg" })
    ).toBe("/api/files/image/ref.jpg");
  });

  it("falls back to the render frame when the show supplied no still", () => {
    expect(shotThumbnail({ thumbnailUrl: null, generatedThumbnailUrl: "/api/files/image/gen.jpg" })).toBe(
      "/api/files/image/gen.jpg"
    );
  });

  it("returns null when the shot has neither", () => {
    expect(shotThumbnail({ thumbnailUrl: null, generatedThumbnailUrl: null })).toBeNull();
    expect(shotThumbnail(null)).toBeNull();
    expect(shotThumbnail({})).toBeNull();
  });

  it("treats an empty string as no thumbnail", () => {
    // updateShot accepts "" from a cleared form field, which must not win over
    // a generated frame or render as a broken <img src="">.
    expect(shotThumbnail({ thumbnailUrl: "", generatedThumbnailUrl: "/api/files/image/gen.jpg" })).toBe(
      "/api/files/image/gen.jpg"
    );
  });

  it("reports whether what is displayed came from a render", () => {
    expect(isGeneratedThumbnail({ thumbnailUrl: null, generatedThumbnailUrl: "/g.jpg" })).toBe(true);
    expect(isGeneratedThumbnail({ thumbnailUrl: "/r.jpg", generatedThumbnailUrl: "/g.jpg" })).toBe(false);
    expect(isGeneratedThumbnail({ thumbnailUrl: null, generatedThumbnailUrl: null })).toBe(false);
  });
});