"""Tests für upload_folder() — Kopie per shutil.copyfile statt read_bytes()."""
from __future__ import annotations

from pathlib import Path
from unittest.mock import patch

from pdf_ocr_hotfolder.config import FolderUpload
from pdf_ocr_hotfolder.uploaders import upload_folder


def test_upload_folder_copies_file(tmp_path: Path) -> None:
    src = tmp_path / "out" / "OCR_scan.pdf"
    src.parent.mkdir()
    src.write_bytes(b"%PDF-1.4 inhalt\n")
    target = tmp_path / "ziel"

    assert upload_folder(src, FolderUpload(enabled=True, target=str(target)),
                         tmp_path / "out") is True
    assert (target / "OCR_scan.pdf").read_bytes() == b"%PDF-1.4 inhalt\n"
    # Quelle bleibt liegen (Kopie, kein Move)
    assert src.exists()


def test_upload_folder_uses_copyfile_not_read_bytes(tmp_path: Path) -> None:
    """Große PDFs dürfen nicht komplett in den Speicher gelesen werden."""
    src = tmp_path / "out" / "OCR_scan.pdf"
    src.parent.mkdir()
    src.write_bytes(b"%PDF-1.4\n")
    target = tmp_path / "ziel"

    with patch("pdf_ocr_hotfolder.uploaders.shutil.copyfile") as copyfile:
        upload_folder(src, FolderUpload(enabled=True, target=str(target)),
                      tmp_path / "out")
    copyfile.assert_called_once()


def test_upload_folder_skips_self_target(tmp_path: Path) -> None:
    """Ist das Ziel = outgoing, wird nicht auf sich selbst kopiert."""
    out = tmp_path / "out"
    out.mkdir()
    src = out / "OCR_scan.pdf"
    src.write_bytes(b"%PDF-1.4\n")

    with patch("pdf_ocr_hotfolder.uploaders.shutil.copyfile") as copyfile:
        assert upload_folder(src, FolderUpload(enabled=True, target=""), out) is True
    copyfile.assert_not_called()
    assert src.read_bytes() == b"%PDF-1.4\n"


def test_upload_folder_disabled_returns_true(tmp_path: Path) -> None:
    src = tmp_path / "OCR_scan.pdf"
    src.write_bytes(b"%PDF-1.4\n")
    assert upload_folder(src, FolderUpload(enabled=False), tmp_path) is True


def test_upload_folder_reports_failure(tmp_path: Path) -> None:
    """OSError beim Kopieren → False (wird vom Service als Fehler gezählt)."""
    src = tmp_path / "out" / "OCR_scan.pdf"
    src.parent.mkdir()
    src.write_bytes(b"%PDF-1.4\n")

    with patch("pdf_ocr_hotfolder.uploaders.shutil.copyfile",
               side_effect=OSError("disk full")):
        assert upload_folder(src, FolderUpload(enabled=True,
                                               target=str(tmp_path / "ziel")),
                             tmp_path / "out") is False