"""Pytest configuration and fixtures.

Every test runs with a scrubbed environment, an empty working directory (so a
developer's own ``.env`` is never read) and state paths inside ``tmp_path``.
Nothing may write to ``/var/log``, ``/var/lib`` or the real home directory.
"""

from __future__ import annotations

from collections.abc import Generator
from pathlib import Path

import pytest

from aegis_gitea_mcp.audit import reset_audit_logger
from aegis_gitea_mcp.config import Settings, reset_settings
from aegis_gitea_mcp.rate_limit import reset_rate_limiter
from aegis_gitea_mcp.request_context import clear_gitea_auth_context


def _reset_singletons() -> None:
    """Reset every module-level singleton."""
    reset_settings()
    reset_audit_logger()
    reset_rate_limiter()
    clear_gitea_auth_context()


@pytest.fixture(autouse=True)
def reset_globals(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Generator[None, None, None]:
    """Isolate each test: clean env, tmp cwd, tmp state paths, fresh singletons."""
    for field_name in Settings.model_fields:
        monkeypatch.delenv(field_name.upper(), raising=False)
    monkeypatch.chdir(tmp_path)

    data_dir = tmp_path / "data"
    monkeypatch.setenv("DATA_DIR", str(data_dir))
    monkeypatch.setenv("AUDIT_LOG_PATH", str(data_dir / "audit.log"))

    _reset_singletons()
    yield
    _reset_singletons()


@pytest.fixture
def mock_env(monkeypatch: pytest.MonkeyPatch) -> None:
    """Minimal valid environment: a Gitea URL and a token."""
    monkeypatch.setenv("GITEA_URL", "https://gitea.example.com")
    monkeypatch.setenv("GITEA_TOKEN", "test-token-12345")