import { afterAll, afterEach, expect, spyOn, test } from "bun:test";
import { CalendarCache } from "./CalendarCache";
const fetchSpy = spyOn(globalThis, "fetch");
afterEach(() => fetchSpy.mockReset());
afterAll(() => fetchSpy.mockRestore());
const range = { from: "2026-07-01", to: "2026-09-30" };
test("calendar cache shares in-flight reads, retains wider history and invalidates changed versions", async () => {
  fetchSpy.mockImplementation(Object.assign(async () => Response.json({ from: range.from, to: range.to, days: [{ date: "2026-07-01" }, { date: "2026-09-01" }] }), { preconnect: fetch.preconnect }));
  const cache = new CalendarCache();
  await Promise.all([cache.load("habit", "v1", range), cache.load("habit", "v1", range)]);
  expect(fetchSpy).toHaveBeenCalledTimes(1);
  expect(String(fetchSpy.mock.calls[0]![0])).toContain("compact=true");
  const subset = await cache.load("habit", "v1", { from: "2026-09-01", to: range.to });
  expect(subset.days).toHaveLength(1);
  expect(fetchSpy).toHaveBeenCalledTimes(1);
  await cache.load("habit", "v2", range);
  expect(fetchSpy).toHaveBeenCalledTimes(2);
  await new CalendarCache().load("habit", "v2", range);
  expect(fetchSpy).toHaveBeenCalledTimes(3);
});
test("a failed history request can be retried without retaining a rejected cache entry", async () => {
  fetchSpy.mockRejectedValueOnce(new Error("offline")).mockResolvedValue(Response.json({ ...range, days: [] }));
  const cache = new CalendarCache();
  await expect(cache.load("habit", "v1", range)).rejects.toThrow("offline");
  await expect(cache.load("habit", "v1", range)).resolves.toMatchObject({ days: [] });
  expect(fetchSpy).toHaveBeenCalledTimes(2);
});