"""The Postfix integration profile against a real Postfix (MAS-WP-0004 T02).

Runs only where Docker is available; builds experiments/postfix-probe.
"""

import importlib.util
import shutil
import subprocess
from pathlib import Path

import pytest

ROOT = Path(__file__).resolve().parents[1]
PROBE_DIR = ROOT / "experiments/postfix-probe"


def _docker_ok():
    if not shutil.which("docker"):
        return False
    return subprocess.run(["docker", "info"], capture_output=True).returncode == 0


pytestmark = pytest.mark.skipif(not _docker_ok(), reason="Docker not available")


@pytest.fixture(scope="module")
def probe_results():
    build = subprocess.run(["docker", "build", "-q", "-t", "mas-postfix-probe", str(PROBE_DIR)],
                           capture_output=True, text=True)
    if build.returncode != 0:
        pytest.skip(f"cannot build probe image: {build.stderr[-300:]}")
    spec = importlib.util.spec_from_file_location("postfix_probe", PROBE_DIR / "probe.py")
    probe = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(probe)
    results, _ = probe.run("mas-profile", 2625, corpus=True)
    return probe, results


def test_never_rewritten(probe_results):
    # Delivered as sent up to RFC 5321 quoting, or refused at SMTP; never altered.
    _, results = probe_results
    for r in results:
        if "relay_refused" in r or r["smtp"] != "accepted":
            continue
        assert r["equivalent"], r
        if not r["unchanged"] and r["arrived_as"].startswith('"'):
            assert r["mas_valid"] is False, r  # quoting added only to non-MAS forms


def test_p2_forms_delivered(probe_results):
    _, results = probe_results
    p2 = [r for r in results if "!" in r["sent"].split("@")[0] and "relay_refused" not in r]
    assert p2
    for r in p2:
        assert r["smtp"] == "accepted" and r["unchanged"], r


def test_not_an_open_relay(probe_results):
    probe, results = probe_results
    relay = [r for r in results if "relay_refused" in r]
    assert [r["sent"] for r in relay] == probe.RELAY_NEGATIVES
    assert all(r["relay_refused"] for r in relay), relay