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"""Integration: orchestrator + real ``smg launch`` + fake_engine."""

from __future__ import annotations

import contextlib
import os
import signal
import socket
import subprocess
import sys
import time

import pytest

pytest.importorskip("smg")
pytest.importorskip("smg_grpc_proto")
import aiohttp  # noqa: E402,F401


def _free_port() -> int:
    with socket.socket() as s:
        s.bind(("127.0.0.1", 0))
        return s.getsockname()[1]


def _wait_http_200(url: str, deadline: float) -> bool:
    import urllib.error
    import urllib.request

    while time.monotonic() < deadline:
        try:
            with urllib.request.urlopen(url, timeout=2) as resp:
                if resp.status == 200:
                    return True
        except (urllib.error.URLError, ConnectionError, TimeoutError):
            pass
        time.sleep(0.5)
    return False


def test_orchestrator_runs_against_fake_engine():
    user_port = _free_port()

    env = os.environ.copy()
    env["TS_SERVE_ENGINE_MODULE"] = "test.cli._fixtures.fake_engine"
    repo_root = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", ".."))
    env["PYTHONPATH"] = repo_root + os.pathsep + env.get("PYTHONPATH", "")

    proc = subprocess.Popen(
        [
            sys.executable,
            "-m",
            "tokenspeed.cli",
            "serve",
            "--model",
            "/fake",
            "--host",
            "127.0.0.1",
            "--port",
            str(user_port),
            "--engine-startup-timeout",
            "30",
            "--gateway-startup-timeout",
            "30",
            "--drain-timeout",
            "5",
            # The fake engine serves a placeholder model id (/fake) with no real
            # tokenizer and no GetTokenizer RPC. Newer smg gates gateway
            # readiness on tokenizer registration, so skip autoload here — this
            # test exercises orchestration/teardown, not tokenizer loading.
            "--disable-tokenizer-autoload",
        ],
        env=env,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
    )

    try:
        ok = _wait_http_200(
            f"http://127.0.0.1:{user_port}/readiness", time.monotonic() + 60
        )
        if not ok:
            stdout, stderr = proc.communicate(timeout=5)
            pytest.fail(
                f"gateway never became healthy.\nstdout:\n{stdout.decode()}\n"
                f"stderr:\n{stderr.decode()}"
            )

        proc.send_signal(signal.SIGTERM)
        try:
            rc = proc.wait(timeout=30)
        except subprocess.TimeoutExpired:
            stdout, stderr = proc.communicate(timeout=5)
            pytest.fail(
                f"orchestrator did not exit 30s after SIGTERM.\n"
                f"stdout:\n{stdout.decode()}\n"
                f"stderr:\n{stderr.decode()}"
            )
        assert rc == 0, f"non-zero rc={rc}"
    finally:
        if proc.returncode is None:
            proc.kill()
            with contextlib.suppress(Exception):
                proc.wait(timeout=5)