import { afterEach, describe, expect, it, vi } from "vitest";
import { HarnessApi } from "../src/api/harness-api.js";

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

describe("HarnessApi request headers", () => {
  it("does not claim an empty POST contains JSON", async () => {
    const fetchMock = vi.fn().mockResolvedValue(new Response(JSON.stringify({
      sessionId: "ses_1",
      requestId: "req_1",
    }), { status: 201, headers: { "Content-Type": "application/json" } }));
    vi.stubGlobal("fetch", fetchMock);

    await new HarnessApi().createSession();

    const request = fetchMock.mock.calls[0]?.[1] as RequestInit;
    expect(new Headers(request.headers).has("Content-Type")).toBe(false);
    expect(request.body).toBeUndefined();
  });

  it("sets JSON content type when a structured body is present", async () => {
    const fetchMock = vi.fn().mockResolvedValue(new Response(JSON.stringify({
      runId: "run_1",
      requestId: "req_1",
    }), { status: 202, headers: { "Content-Type": "application/json" } }));
    vi.stubGlobal("fetch", fetchMock);

    await new HarnessApi().sendMessage("ses_1", { text: "hello", attachmentIds: [] });

    const request = fetchMock.mock.calls[0]?.[1] as RequestInit;
    expect(new Headers(request.headers).get("Content-Type")).toBe("application/json");
    expect(request.body).toBe(JSON.stringify({ text: "hello", attachmentIds: [] }));
  });
});