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

const MockClient = vi.fn(function (opts) {
  this.apiKey = opts?.apiKey;
});

// Mock the OpenAI SDK — Vitest hoists vi.mock automatically.
vi.mock("openai", () => ({ default: MockClient }));

const { createOpenAIClient } = await import("../../src/openai/client.js");

describe("createOpenAIClient", () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it("creates OpenAI client with supplied apiKey", () => {
    const config = { openaiApiKey: "sk-test-key" };
    const client = createOpenAIClient(config);

    expect(MockClient).toHaveBeenCalledTimes(1);
    expect(MockClient).toHaveBeenCalledWith({ apiKey: "sk-test-key" });
    expect(client.apiKey).toBe("sk-test-key");
  });

  it("throws when openaiApiKey is missing", () => {
    const config = {};

    expect(() => createOpenAIClient(config)).toThrow("Missing config.openaiApiKey.");
    expect(MockClient).not.toHaveBeenCalled();
  });

  it("throws when openaiApiKey is empty string", () => {
    const config = { openaiApiKey: "" };

    expect(() => createOpenAIClient(config)).toThrow("Missing config.openaiApiKey.");
    expect(MockClient).not.toHaveBeenCalled();
  });
});