"""Tests für `--check-config`.

Die Exit-Codes werden vom Updater ausgewertet und müssen verlässlich sein:
0 = sauber, 1 = nur Warnungen, 2 = Fehler.
"""
from __future__ import annotations

import sys
from pathlib import Path
from unittest.mock import patch

import pytest

from pdf_ocr_hotfolder.__main__ import CHECK_ERROR, CHECK_OK, CHECK_WARN, main


def _cfg_file(tmp_path: Path, tmp_config, extra: str = "") -> Path:
    cfg_file = tmp_path / "cfg.toml"
    cfg_file.write_text(f"""
[paths]
incoming = "{tmp_config.paths.incoming}"
outgoing = "{tmp_config.paths.outgoing}"
working  = "{tmp_config.paths.working}"
error    = "{tmp_config.paths.error}"
""" + extra)
    return cfg_file


def _check(monkeypatch, cfg_file: Path, binaries_present: bool = True) -> int:
    monkeypatch.setattr(sys, "argv",
                        ["pdf-ocr-hotfolder", "--config", str(cfg_file),
                         "--check-config"])
    which = "/usr/bin/fake" if binaries_present else None
    with patch("pdf_ocr_hotfolder.service.shutil.which", return_value=which):
        return main()


# ---------------- Exit 0 ----------------

def test_clean_config_returns_0(tmp_path, tmp_config, monkeypatch, capsys) -> None:
    rc = _check(monkeypatch, _cfg_file(tmp_path, tmp_config))
    assert rc == CHECK_OK
    out = capsys.readouterr().out
    assert "Config sauber" in out


def test_check_does_not_process_files(tmp_path, tmp_config, monkeypatch) -> None:
    """Der Check darf nichts verarbeiten und nichts verschieben."""
    pdf = tmp_config.paths.incoming / "scan.pdf"
    pdf.write_bytes(b"%PDF-1.4\n")

    assert _check(monkeypatch, _cfg_file(tmp_path, tmp_config)) == CHECK_OK
    assert pdf.exists()
    assert list(tmp_config.paths.outgoing.iterdir()) == []


# ---------------- Exit 1 (nur Warnungen) ----------------

def test_legacy_timeout_returns_1(tmp_path, tmp_config, monkeypatch, capsys) -> None:
    rc = _check(monkeypatch, _cfg_file(tmp_path, tmp_config,
                                       "\n[ocr]\ntimeout = 1800\n"))
    assert rc == CHECK_WARN
    out = capsys.readouterr().out
    assert "WARNUNG" in out
    assert "PRO SEITE" in out


def test_unknown_key_returns_1(tmp_path, tmp_config, monkeypatch, capsys) -> None:
    rc = _check(monkeypatch, _cfg_file(tmp_path, tmp_config,
                                       '\n[ocr]\nlangauges = "deu"\n'))
    assert rc == CHECK_WARN
    assert "[ocr].langauges" in capsys.readouterr().out


def test_pdfa_level_with_healthy_ghostscript_returns_1(
        tmp_path, tmp_config, monkeypatch, capsys) -> None:
    """Gesundes Ghostscript: nur Hinweis (Exit 1), kein Abbruch."""
    monkeypatch.setattr(sys, "argv",
                        ["pdf-ocr-hotfolder", "--config",
                         str(_cfg_file(tmp_path, tmp_config,
                                       '\n[ocr]\npdfa_level = "2"\n')),
                         "--check-config"])
    with patch("pdf_ocr_hotfolder.service.shutil.which", return_value="/usr/bin/fake"), \
         patch("pdf_ocr_hotfolder.service.detect_ghostscript_version",
               return_value="10.02.1"):
        rc = main()
    assert rc == CHECK_WARN
    assert "Ghostscript" in capsys.readouterr().out


# ---------------- Exit 2 (Fehler) ----------------

def test_missing_config_file_returns_2(tmp_path, monkeypatch, capsys) -> None:
    monkeypatch.setattr(sys, "argv",
                        ["pdf-ocr-hotfolder", "--config",
                         str(tmp_path / "gibtsnicht.toml"), "--check-config"])
    assert main() == CHECK_ERROR
    assert "nicht gefunden" in capsys.readouterr().err


def test_broken_paths_section_returns_2(tmp_path, monkeypatch, capsys) -> None:
    cfg_file = tmp_path / "cfg.toml"
    cfg_file.write_text('[ocr]\nlanguages = "deu"\n')
    assert _check(monkeypatch, cfg_file) == CHECK_ERROR
    assert "[paths]" in capsys.readouterr().err


def test_invalid_toml_returns_2(tmp_path, monkeypatch, capsys) -> None:
    """Kaputtes TOML: saubere Meldung statt Traceback."""
    cfg_file = tmp_path / "cfg.toml"
    cfg_file.write_text("[paths\nincoming = ")
    assert _check(monkeypatch, cfg_file) == CHECK_ERROR
    assert "TOML" in capsys.readouterr().err


def test_missing_binaries_return_2(tmp_path, tmp_config, monkeypatch, capsys) -> None:
    rc = _check(monkeypatch, _cfg_file(tmp_path, tmp_config),
                binaries_present=False)
    assert rc == CHECK_ERROR
    err = capsys.readouterr().err
    assert "tesseract" in err


def test_invalid_name_mode_returns_2(tmp_path, tmp_config, monkeypatch, capsys) -> None:
    rc = _check(monkeypatch, _cfg_file(tmp_path, tmp_config,
                                       '\n[output]\nname_mode = "praefix"\n'))
    assert rc == CHECK_ERROR
    assert "name_mode" in capsys.readouterr().err


def test_archive_without_dir_returns_2(tmp_path, tmp_config, monkeypatch, capsys) -> None:
    rc = _check(monkeypatch, _cfg_file(tmp_path, tmp_config,
                                       '\n[output]\noriginal_on_success = "archive"\n'))
    assert rc == CHECK_ERROR
    assert "archive_dir" in capsys.readouterr().err


def test_error_beats_warning(tmp_path, tmp_config, monkeypatch) -> None:
    """Fehler + Warnung → Exit 2, nicht 1."""
    rc = _check(monkeypatch,
                _cfg_file(tmp_path, tmp_config,
                          '\n[ocr]\ntimeout = 1800\n\n[output]\nname_mode = "x"\n'))
    assert rc == CHECK_ERROR


# ---------------- Zusammenspiel mit anderen Optionen ----------------

def test_check_config_wins_over_once(tmp_path, tmp_config, monkeypatch) -> None:
    """--check-config hat Vorrang: es wird nichts verarbeitet."""
    pdf = tmp_config.paths.incoming / "scan.pdf"
    pdf.write_bytes(b"%PDF-1.4\n")
    monkeypatch.setattr(sys, "argv",
                        ["pdf-ocr-hotfolder", "--config",
                         str(_cfg_file(tmp_path, tmp_config)),
                         "--once", "--check-config"])
    with patch("pdf_ocr_hotfolder.service.shutil.which", return_value="/usr/bin/fake"):
        assert main() == CHECK_OK
    assert pdf.exists()


@pytest.mark.parametrize("code,expected", [(CHECK_OK, 0), (CHECK_WARN, 1),
                                           (CHECK_ERROR, 2)])
def test_exit_code_constants(code: int, expected: int) -> None:
    """Die Konstanten sind Teil der Schnittstelle zum Updater."""
    assert code == expected