import { HTTPError } from "ky";
import { callApi } from "./callApi";

function makeHttpError(status: number, body: object) {
  const response = new Response(JSON.stringify(body), {
    status,
    headers: { "Content-Type": "application/json" },
  });
  return new HTTPError(response, new Request("http://test.com"), {});
}

describe("callApi", () => {
  describe("happy path", () => {
    it("returns [data, null] when the fn resolves", async () => {
      const [data, error] = await callApi(() => Promise.resolve({ id: 1 }));

      expect(data).toEqual({ id: 1 });
      expect(error).toBeNull();
    });
  });

  describe("error cases", () => {
    it("returns [null, ApiError] on HTTPError", async () => {
      const [data, error] = await callApi(() =>
        Promise.reject(makeHttpError(401, { message: "Unauthorized" })),
      );

      expect(data).toBeNull();
      expect(error).toEqual({ status: 401, message: "Unauthorized" });
    });

    it("re-throws non-HTTP errors", async () => {
      const unexpected = new TypeError("Network failure");

      await expect(
        callApi(() => Promise.reject(unexpected)),
      ).rejects.toThrow("Network failure");
    });
  });
});