/**
 * KHAELOR
 * File: tests/tui/pty-echo.test.ts
 * Description: PTY integration test — typed characters must echo in the live region before Enter is ever pressed.
 *
 * Author: Simon-Pierre Boucher
 * Contact: contact@spboucher.ai
 */

import { execFile } from "node:child_process";
import { existsSync } from "node:fs";
import { promisify } from "node:util";
import { describe, expect, it } from "vitest";

const run = promisify(execFile);

const EXPECT_BIN = ["/usr/bin/expect", "/bin/expect", "/usr/local/bin/expect"].find((p) =>
  existsSync(p),
);

describe.skipIf(EXPECT_BIN === undefined)("live keystroke echo under a real PTY", () => {
  it(
    "shows typed text in the composer before Enter (regression: invisible typing)",
    async () => {
      const { stdout } = await run(EXPECT_BIN as string, ["tests/tui/fixtures/pty-echo.exp"], {
        cwd: process.cwd(),
        timeout: 60_000,
        env: { ...process.env, TERM: "xterm-256color" },
      });
      expect(stdout).toContain("STARTUP_OK");
      expect(stdout).toContain("BOX_VISIBLE");
      expect(stdout).toContain("ECHO_VISIBLE");
      // Real latency from send to on-screen echo (PTY round trip included).
      const ms = /ECHO_VISIBLE (\d+)ms/.exec(stdout);
      expect(ms).not.toBeNull();
      expect(Number((ms as RegExpExecArray)[1])).toBeLessThan(1000);
    },
    60_000,
  );
});