import { test, expect } from "vitest";
import { spawn } from "node:child_process";
import path from "node:path";
import { buildApp } from "../src/app.js";
import { loadConfig } from "../src/config.js";

const FAKE = path.resolve("../harness/tests/fake_pi/fake_pi_rpc.mjs");
const SCRIPT = path.resolve("../harness/tests/fake_pi/scripts/f1_disambiguation.json");

test("loop F1: crea sessione → SSE riceve il widget → risponde → 204", async () => {
  const app = buildApp(loadConfig({ THT_HARNESS_DIR: "../harness" }), {
    thtRunner: {
      sessionNew: async () => ({ id: "s1" }),
      sessionShow: async (_id: string) => ({ id: "s1", provider: undefined, model: undefined, thinking: undefined }),
      sessionList: async () => [],
    } as any,
    spawnFn: () => spawn("node", [FAKE, SCRIPT]) as any,
  });
  await app.listen({ port: 0, host: "127.0.0.1" });
  const base = `http://127.0.0.1:${(app.server.address() as any).port}`;

  // 1. Create session — spawns fake-pi, sends prompt, fake-pi emits widget
  await fetch(`${base}/sessions`, {
    method: "POST",
    headers: { "content-type": "application/json" },
    body: JSON.stringify({ workspace: "w", question: "q" }),
  });

  // 2. Small delay to let fake-pi process the prompt and fill pendingWidget
  await new Promise((r) => setTimeout(r, 50));

  // 3. SSE: read the first event (pendingWidget re-emit via subscribe)
  const es = await fetch(`${base}/sessions/s1/events`);
  const reader = es.body!.getReader();
  const chunk = await reader.read();
  const text = new TextDecoder().decode(chunk.value);
  expect(text).toContain("ui_request");
  await reader.cancel();

  // 4. POST response — widget id is "u1" from f1_disambiguation.json
  const resp = await fetch(`${base}/sessions/s1/response`, {
    method: "POST",
    headers: { "content-type": "application/json" },
    body: JSON.stringify({ ui_response: { id: "u1", choices: ["a"] } }),
  });
  expect(resp.status).toBe(204);

  await app.close();
}, 10000);