from __future__ import annotations

from pathlib import Path
from types import SimpleNamespace

import pytest

from deerflow.utils import file_conversion


@pytest.fixture(autouse=True)
def local_parser(monkeypatch):
    # Parser-selection unit tests inject readers locally. Production always
    # sends this same top-level parser entry point to spawned worker processes.
    monkeypatch.setattr(
        file_conversion,
        "_run_conversion_in_process",
        lambda path, converter: file_conversion._convert_document_worker(str(path), converter),
    )


def test_legacy_word_is_normalized_before_markitdown(monkeypatch, tmp_path: Path) -> None:
    source = tmp_path / "legacy.doc"
    source.write_bytes(b"legacy")

    monkeypatch.setattr(file_conversion.shutil, "which", lambda _name: "/usr/bin/soffice")
    monkeypatch.setattr(
        file_conversion,
        "_convert_with_markitdown",
        lambda path: f"converted:{path.suffix}",
    )

    def fake_run(command, **_kwargs):
        output_dir = Path(command[command.index("--outdir") + 1])
        (output_dir / "legacy.docx").write_bytes(b"normalized")
        return SimpleNamespace(returncode=0, stderr="")

    monkeypatch.setattr(file_conversion.subprocess, "run", fake_run)

    assert file_conversion._do_convert(source, "auto") == "converted:.docx"


def test_modern_office_file_does_not_start_libreoffice(monkeypatch, tmp_path: Path) -> None:
    source = tmp_path / "modern.pptx"
    source.write_bytes(b"modern")
    monkeypatch.setattr(
        file_conversion,
        "_convert_with_markitdown",
        lambda path: f"direct:{path.suffix}",
    )
    monkeypatch.setattr(
        file_conversion.subprocess,
        "run",
        lambda *_args, **_kwargs: (_ for _ in ()).throw(AssertionError("unexpected LibreOffice call")),
    )

    assert file_conversion._do_convert(source, "auto") == "direct:.pptx"


def test_legacy_office_falls_back_when_libreoffice_is_missing(monkeypatch, tmp_path: Path) -> None:
    source = tmp_path / "legacy.xls"
    source.write_bytes(b"legacy")
    monkeypatch.setattr(file_conversion.shutil, "which", lambda _name: None)
    monkeypatch.setattr(
        file_conversion,
        "_convert_with_markitdown",
        lambda path: f"fallback:{path.suffix}",
    )

    assert file_conversion._do_convert(source, "auto") == "fallback:.xls"