import { test, expect } from "vitest";
import { spawn } from "node:child_process";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { PiProcessManager } from "../src/pi/pi-process-manager.js";
import { loadConfig } from "../src/config.js";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const FAKE = path.resolve(__dirname, "../../harness/tests/fake_pi/fake_pi_rpc.mjs");
const SCRIPT = path.resolve(__dirname, "../../harness/tests/fake_pi/scripts/f1_disambiguation.json");

test("spawnFor avvia un runtime e il bridge emette il widget F1", async () => {
  const cfg = loadConfig({ THT_HARNESS_DIR: "../harness" });
  const mgr = new PiProcessManager(cfg, { spawnFn: () => spawn("node", [FAKE, SCRIPT]) as any });
  const rt = await mgr.spawnFor("2026-06-27-100000-x", {});
  const widget = await new Promise<any>((res) => rt.bridge.onClientEvent((e) => e.type === "ui_request" && res(e)));
  expect(widget.ui_request.widget).toBe("select");
  mgr.teardown("2026-06-27-100000-x");
  expect(mgr.count()).toBe(0);
});

test("l'exit del child rimuove il runtime dalla mappa (exit handler)", async () => {
  const cfg = loadConfig({ THT_HARNESS_DIR: "../harness" });
  const mgr = new PiProcessManager(cfg, { spawnFn: () => spawn("node", [FAKE, SCRIPT]) as any });
  const rt = await mgr.spawnFor("exit-test", {});
  expect(mgr.count()).toBe(1);
  // Cause the child to exit on its own and await the 'exit' event (no teardown call).
  const exited = new Promise<void>((res) => rt.child.on("exit", () => res()));
  rt.child.kill();
  await exited;
  // Let the manager's registered exit handler run.
  await new Promise((res) => setImmediate(res));
  expect(mgr.count()).toBe(0);
  expect(mgr.get("exit-test")).toBeUndefined();
});

test("oltre maxPiProcesses solleva errore", async () => {
  const cfg = { ...loadConfig({}), maxPiProcesses: 1 };
  const mgr = new PiProcessManager(cfg, { spawnFn: () => spawn("node", [FAKE, SCRIPT]) as any });
  await mgr.spawnFor("a", {});
  await expect(mgr.spawnFor("b", {})).rejects.toThrow(/max/i);
  mgr.teardown("a");
});