import { describe, it, expect } from "vitest";
import { errorAfterLoad, loadErrorMessage } from "./detailLoadError";

/**
 * TRACES: UR-062 | DR-297 | UT-267
 *
 * Resuming the app after a few minutes in the background replaced a series page
 * that was on screen with "Failed to load item". The resume reload is a refresh
 * of content the cache had already answered, yet any throw in it blanked the
 * page — and no later successful reload of the same item ever cleared it.
 */
describe("errorAfterLoad", () => {
  it("clears the error when a load succeeds", () => {
    expect(errorAfterLoad({ ok: true }, { refreshing: true })).toBeNull();
    expect(errorAfterLoad({ ok: true }, { refreshing: false })).toBeNull();
  });

  it("keeps a page on screen when a refresh of it fails", () => {
    expect(errorAfterLoad({ ok: false, error: "boom" }, { refreshing: true })).toBeNull();
  });

  it("reports a failure to open an item that is not on screen yet", () => {
    expect(errorAfterLoad({ ok: false, error: new Error("Offline") }, { refreshing: false })).toBe(
      "Offline",
    );
  });
});

describe("loadErrorMessage", () => {
  it("shows the text of a backend error, which arrives as a plain string", () => {
    expect(loadErrorMessage("Repository not found")).toBe("Repository not found");
  });

  it("shows an Error's message", () => {
    expect(loadErrorMessage(new TypeError("x is undefined"))).toBe("x is undefined");
  });

  it("falls back to a generic message for anything else", () => {
    expect(loadErrorMessage(undefined)).toBe("Failed to load item");
    expect(loadErrorMessage({})).toBe("Failed to load item");
    expect(loadErrorMessage("")).toBe("Failed to load item");
  });
});