"""Tests für verständliche Fehlermeldungen beim Laden der Config."""
from __future__ import annotations

import sys
from pathlib import Path

import pytest

from pdf_ocr_hotfolder.config import ConfigError, load_config

_FULL_PATHS = """
[paths]
incoming = "/tmp/in"
outgoing = "/tmp/out"
working  = "/tmp/work"
error    = "/tmp/err"
"""


def _write(tmp_path: Path, content: str) -> Path:
    cfg = tmp_path / "config.toml"
    cfg.write_text(content)
    return cfg


def test_missing_paths_section(tmp_path: Path) -> None:
    """Fehlt [paths] komplett → ConfigError statt KeyError."""
    cfg = _write(tmp_path, '[ocr]\nlanguages = "deu"\n')
    with pytest.raises(ConfigError) as exc:
        load_config(cfg)
    msg = str(exc.value)
    assert "[paths]" in msg
    assert str(cfg) in msg


def test_empty_config_file(tmp_path: Path) -> None:
    cfg = _write(tmp_path, "")
    with pytest.raises(ConfigError, match=r"\[paths\]"):
        load_config(cfg)


@pytest.mark.parametrize("missing", ["incoming", "outgoing", "working", "error"])
def test_missing_single_path_key(tmp_path: Path, missing: str) -> None:
    """Fehlt ein einzelner Key, wird genau dieser genannt."""
    lines = [line for line in _FULL_PATHS.strip().splitlines()
             if not line.startswith(missing)]
    cfg = _write(tmp_path, "\n".join(lines) + "\n")
    with pytest.raises(ConfigError) as exc:
        load_config(cfg)
    msg = str(exc.value)
    assert missing in msg
    assert str(cfg) in msg


def test_empty_path_value_is_rejected(tmp_path: Path) -> None:
    """Ein leerer Pfad ist genauso falsch wie ein fehlender."""
    cfg = _write(tmp_path, _FULL_PATHS.replace('working  = "/tmp/work"',
                                               'working  = ""'))
    with pytest.raises(ConfigError, match="working"):
        load_config(cfg)


def test_complete_paths_section_loads(tmp_path: Path) -> None:
    cfg = _write(tmp_path, _FULL_PATHS)
    loaded = load_config(cfg)
    assert loaded.paths.incoming == Path("/tmp/in")
    assert loaded.paths.error == Path("/tmp/err")


def test_main_returns_2_on_broken_config(tmp_path: Path, monkeypatch, capsys) -> None:
    """CLI bricht sauber mit Exit-Code 2 ab — ohne Traceback."""
    cfg = _write(tmp_path, '[ocr]\nlanguages = "deu"\n')
    monkeypatch.setattr(sys, "argv",
                        ["pdf-ocr-hotfolder", "--config", str(cfg), "--once"])
    from pdf_ocr_hotfolder.__main__ import main
    assert main() == 2
    err = capsys.readouterr().err
    assert "FEHLER" in err
    assert "[paths]" in err