import { beforeEach, describe, expect, it, vi } from "vitest";

import { Result } from "@/utils";

const getHistoryMock = vi.hoisted(() => vi.fn());

vi.mock("@/data/repositories/chat_repository", () => ({
  getChatRepository: () => ({ getHistory: getHistoryMock }),
}));

import { fetchSplashLatestMessagePreview } from "../splash_latest_message";

describe("fetchSplashLatestMessagePreview", () => {
  beforeEach(() => {
    getHistoryMock.mockReset();
  });

  it("uses the last message returned by history", async () => {
    getHistoryMock.mockResolvedValue(
      Result.ok({
        messages: [
          { type: "text", content: "Older message" },
          { type: "text", content: "Latest message" },
        ],
      }),
    );

    const result = await fetchSplashLatestMessagePreview();

    expect(getHistoryMock).toHaveBeenCalledWith(1, 0);
    expect(Result.isOk(result) && result.data).toBe("Latest message");
  });

  it("returns null when history is empty", async () => {
    getHistoryMock.mockResolvedValue(Result.ok({ messages: [] }));

    const result = await fetchSplashLatestMessagePreview();

    expect(Result.isOk(result) && result.data).toBeNull();
  });
});