import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { __resetLocalStorage } from "../__mocks__/@vicinae/api";
import { forgetVisionSupport, visionSupport } from "../lib/vision";

/**
 * The capability check decides whether a snip feature is offered at all, so the
 * cases that matter are the ones where the answer is not a clean yes or no: a
 * dead network must not be mistaken for "this model cannot see".
 */

const fetchMock = vi.fn();

function showResponse(capabilities: string[]): Response {
  return new Response(JSON.stringify({ capabilities }), {
    status: 200,
    headers: { "Content-Type": "application/json" },
  });
}

beforeEach(() => {
  __resetLocalStorage();
  fetchMock.mockReset();
  vi.stubGlobal("fetch", fetchMock);
});

afterEach(() => {
  vi.unstubAllGlobals();
});

const base = { host: "https://ollama.com", apiKey: "k", model: "gemma4" };

describe("visionSupport", () => {
  it("reports yes when Ollama lists the vision capability", async () => {
    fetchMock.mockResolvedValueOnce(showResponse(["completion", "vision"]));
    await expect(visionSupport(base)).resolves.toBe("yes");
  });

  it("reports no for a text-only model", async () => {
    fetchMock.mockResolvedValueOnce(showResponse(["completion", "tools"]));
    await expect(visionSupport(base)).resolves.toBe("no");
  });

  it("asks /api/show for the model", async () => {
    fetchMock.mockResolvedValueOnce(showResponse(["vision"]));
    await visionSupport(base);

    const [url, init] = fetchMock.mock.calls[0];
    expect(url).toBe("https://ollama.com/api/show");
    expect(JSON.parse(init.body)).toEqual({ model: "gemma4" });
  });

  it("serves a repeat question from the cache", async () => {
    fetchMock.mockResolvedValueOnce(showResponse(["vision"]));
    await visionSupport(base);
    await expect(visionSupport(base)).resolves.toBe("yes");

    expect(fetchMock).toHaveBeenCalledTimes(1);
  });

  it("caches a negative too, so a text model is not re-checked on every mount", async () => {
    fetchMock.mockResolvedValueOnce(showResponse(["tools"]));
    await visionSupport(base);
    await expect(visionSupport(base)).resolves.toBe("no");

    expect(fetchMock).toHaveBeenCalledTimes(1);
  });

  it("keys the cache per model, so switching model re-checks", async () => {
    fetchMock.mockResolvedValueOnce(showResponse(["vision"]));
    await visionSupport(base);

    fetchMock.mockResolvedValueOnce(showResponse(["tools"]));
    await expect(visionSupport({ ...base, model: "gpt-oss:120b" })).resolves.toBe("no");

    expect(fetchMock).toHaveBeenCalledTimes(2);
  });

  it("re-checks when explicitly asked to, even with a cache entry", async () => {
    fetchMock.mockResolvedValueOnce(showResponse(["tools"]));
    await visionSupport(base);

    fetchMock.mockResolvedValueOnce(showResponse(["vision"]));
    await expect(visionSupport({ ...base, refresh: true })).resolves.toBe("yes");
  });

  it("reports unknown rather than no when the request fails", async () => {
    // A dead network is not evidence that a model cannot see, and treating it as
    // such would hide the feature for a reason the user cannot see.
    fetchMock.mockRejectedValueOnce(new Error("offline"));
    await expect(visionSupport(base)).resolves.toBe("unknown");
  });

  it("does not cache a failure", async () => {
    fetchMock.mockRejectedValueOnce(new Error("offline"));
    await visionSupport(base);

    fetchMock.mockResolvedValueOnce(showResponse(["vision"]));
    await expect(visionSupport(base)).resolves.toBe("yes");

    expect(fetchMock).toHaveBeenCalledTimes(2);
  });

  it("reports a rejected key as unknown rather than crashing", async () => {
    fetchMock.mockResolvedValueOnce(new Response("unauthorized", { status: 401 }));
    await expect(visionSupport(base)).resolves.toBe("unknown");
  });
});

describe("forgetVisionSupport", () => {
  it("drops every cached answer, so a re-pulled model is not pinned to no", async () => {
    fetchMock.mockResolvedValueOnce(showResponse(["vision"]));
    await visionSupport(base);

    await forgetVisionSupport();

    fetchMock.mockResolvedValueOnce(showResponse(["vision"]));
    await visionSupport(base);

    expect(fetchMock).toHaveBeenCalledTimes(2);
  });
});