"""Browser <-> backend pair: real Chrome (CDP) against the real backend HTTP server.

Requires Node and a Chrome instance exposing the DevTools protocol on
127.0.0.1:9444 (see frontend/README.md). Skips otherwise.
"""

from __future__ import annotations

import os
import shutil
import socket
import subprocess
import sys
import time
import urllib.request
from pathlib import Path

import pytest

from tests.integration.conftest import REPO_ROOT

pytestmark = pytest.mark.integration

CHROME_PORT = int(os.getenv("CW_CHROME_CDP_PORT", "9444"))


def chrome_available() -> bool:
    try:
        with urllib.request.urlopen(f"http://127.0.0.1:{CHROME_PORT}/json/version", timeout=2) as r:
            return r.status == 200
    except Exception:
        return False


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


@pytest.mark.skipif(shutil.which("node") is None or not chrome_available(), reason="node and Chrome CDP on 9444 required")
def test_browser_against_real_backend(tmp_path: Path):
    port = free_port()
    control = tmp_path / "scenario"
    control.write_text("standard\n")
    env = {
        "PATH": os.environ["PATH"],
        "CW_PEER_CONTROL_FILE": str(control),
        "CW_ARTIFACT_DIR": str(tmp_path / "artifacts"),
        "CW_DEV_PORT": str(port),
        "PYTHONPATH": str(REPO_ROOT),
    }
    server = subprocess.Popen([sys.executable, str(REPO_ROOT / "tests/integration/dev_server.py")], env=env, cwd=REPO_ROOT)
    try:
        deadline = time.time() + 30
        while time.time() < deadline:
            try:
                with urllib.request.urlopen(f"http://127.0.0.1:{port}/", timeout=1) as r:
                    if r.status == 200:
                        break
            except Exception:
                time.sleep(0.2)
        else:
            raise AssertionError("dev server did not start")
        res = subprocess.run(
            ["node", str(REPO_ROOT / "tests/integration/browser_backend.mjs"), "--app", f"http://127.0.0.1:{port}", "--control", str(control), "--chrome", str(CHROME_PORT)],
            capture_output=True, text=True, timeout=300, cwd=REPO_ROOT,
        )
        print(res.stdout)
        print(res.stderr, file=sys.stderr)
        assert res.returncode == 0, res.stdout + res.stderr
    finally:
        server.terminate()
        try:
            server.wait(timeout=10)
        except subprocess.TimeoutExpired:
            server.kill()