import { describe, expect, it } from "vitest";
import { createHunterSave } from "./data";
import { resolveSaveContinuation, saveVersionsMatch } from "./saveContinuation";

function save(updatedAt: string) {
  return createHunterSave(1, updatedAt, "Test Hunter");
}

describe("save continuation", () => {
  it("creates only when neither copy exists", () => {
    expect(resolveSaveContinuation({ local: null, online: null })).toBe("create");
  });

  it("uses whichever single copy exists", () => {
    const local = save("2026-07-13T12:00:00.000Z");
    const online = save("2026-07-13T13:00:00.000Z");
    expect(resolveSaveContinuation({ local, online: null })).toBe("local");
    expect(resolveSaveContinuation({ local: null, online })).toBe("online");
  });

  it("asks only when online copy is newer", () => {
    const local = save("2026-07-13T12:00:00.000Z");
    expect(resolveSaveContinuation({ local, online: save("2026-07-13T13:00:00.000Z") })).toBe("choose");
    expect(resolveSaveContinuation({ local, online: save("2026-07-13T11:00:00.000Z") })).toBe("local");
    expect(resolveSaveContinuation({ local, online: save(local.updatedAt) })).toBe("local");
  });

  it("matches downloaded copies by slot and timestamp", () => {
    const local = save("2026-07-13T12:00:00.000Z");
    expect(saveVersionsMatch(local, save(local.updatedAt))).toBe(true);
    expect(saveVersionsMatch(local, save("2026-07-13T13:00:00.000Z"))).toBe(false);
    expect(saveVersionsMatch(local, null)).toBe(false);
  });
});