"""#64: импорт модулей не должен давать side effects в процессе."""

import os
import subprocess
import sys
from pathlib import Path

REPO_ROOT = Path(__file__).resolve().parent.parent


def _run_in_subprocess(code: str, cwd: Path) -> str:
    """Выполняет code в чистом интерпретаторе с доступом к пакету."""
    env = {**os.environ, "PYTHONPATH": str(REPO_ROOT)}
    result = subprocess.run(
        [sys.executable, "-c", code],
        cwd=cwd,
        env=env,
        capture_output=True,
        text=True,
        check=True,
    )
    return result.stdout.strip()


def test_config_import_does_not_mutate_os_environ(tmp_path):
    """import redmine_reporter.config не подгружает .env из текущей директории."""
    (tmp_path / ".env").write_text("RR_IMPORT_PROBE=1\n")

    output = _run_in_subprocess(
        "import os\n"
        "import redmine_reporter.config\n"
        "print('RR_IMPORT_PROBE' in os.environ)\n",
        cwd=tmp_path,
    )

    assert output == "False"


def test_mailer_import_does_not_mutate_global_charset_registry(tmp_path):
    """import redmine_reporter.mailer не меняет email.charset для всего процесса."""
    output = _run_in_subprocess(
        "from email.charset import BASE64, Charset\n"
        "before = Charset('utf-8').body_encoding\n"
        "import redmine_reporter.mailer\n"
        "after = Charset('utf-8').body_encoding\n"
        "print(before == BASE64, after == BASE64)\n",
        cwd=tmp_path,
    )

    assert output == "True True"