"""Tests for the minimal .env loader (stdlib, no python-dotenv)."""
from __future__ import annotations

from pathlib import Path

import pytest

from atm.config import _find_env_file, _load_env_file


def test_no_file_returns_none(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.chdir(tmp_path)
    assert _find_env_file() is None


def test_finds_env_in_root(tmp_path: Path) -> None:
    (tmp_path / "pyproject.toml").write_text("", encoding="utf-8")
    (tmp_path / ".env").write_text("X=1\n", encoding="utf-8")
    sub = tmp_path / "sub" / "deeper"
    sub.mkdir(parents=True)
    found = _find_env_file(sub)
    assert found == (tmp_path / ".env").resolve()


def test_pyproject_sentinel_stops_walk(tmp_path: Path) -> None:
    (tmp_path / "pyproject.toml").write_text("", encoding="utf-8")
    sub = tmp_path / "sub"
    sub.mkdir()
    assert _find_env_file(sub) is None


def test_parses_simple_kv(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    for k in ("A", "B", "C"):
        monkeypatch.delenv(k, raising=False)
    env = tmp_path / ".env"
    env.write_text(
        "# comment\n"
        "\n"
        "A=1\n"
        "B=hello world\n"
        "   # indented comment\n"
        "C=with=equals=in=value\n",
        encoding="utf-8",
    )
    loaded, overridden = _load_env_file(env)
    assert loaded == 3
    assert overridden == 0
    import os
    assert os.environ["A"] == "1"
    assert os.environ["B"] == "hello world"
    assert os.environ["C"] == "with=equals=in=value"


def test_parses_quoted_values(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    for k in ("SQ", "DQ"):
        monkeypatch.delenv(k, raising=False)
    env = tmp_path / ".env"
    env.write_text("SQ='abc'\nDQ=\"def\"\n", encoding="utf-8")
    _load_env_file(env)
    import os
    assert os.environ["SQ"] == "abc"
    assert os.environ["DQ"] == "def"


def test_handles_crlf_and_whitespace(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    for k in ("K1", "K2"):
        monkeypatch.delenv(k, raising=False)
    env = tmp_path / ".env"
    env.write_bytes(b"K1=v1\r\n  K2 = v2  \r\n")
    _load_env_file(env)
    import os
    assert os.environ["K1"] == "v1"
    assert os.environ["K2"] == "v2"


def test_shell_env_wins(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setenv("SHELLWINS", "from_shell")
    env = tmp_path / ".env"
    env.write_text("SHELLWINS=from_file\nOTHER=x\n", encoding="utf-8")
    monkeypatch.delenv("OTHER", raising=False)
    loaded, overridden = _load_env_file(env)
    import os
    assert os.environ["SHELLWINS"] == "from_shell"
    assert os.environ["OTHER"] == "x"
    assert loaded == 1
    assert overridden == 1


def test_malformed_line_raises_with_lineno(tmp_path: Path) -> None:
    env = tmp_path / ".env"
    env.write_text("A=1\nOOPSNOEQUALS\n", encoding="utf-8")
    with pytest.raises(ValueError, match=":2:"):
        _load_env_file(env)


def test_missing_path_is_noop() -> None:
    assert _load_env_file(None) == (0, 0)
    assert _load_env_file(Path("/nonexistent/does-not-exist-xyz")) == (0, 0)