import os
import platform
from pathlib import Path
from unittest.mock import MagicMock

import pytest

from dangerzone import errors
from dangerzone.document import ARCHIVE_SUBDIR, SAFE_EXTENSION, Document

from . import sample_pdf, unreadable_pdf


def test_input_sample_init(sample_pdf: str) -> None:
    Document(sample_pdf)


def test_input_sample_init_archive(sample_pdf: str) -> None:
    Document(sample_pdf, archive=True)


def test_input_sample_after(sample_pdf: str) -> None:
    d = Document()
    d.input_filename = sample_pdf


def test_input_file_none() -> None:
    """
    Attempts to read a document's filename when no doc has been set
    """
    d = Document()
    with pytest.raises(errors.NotSetInputFilenameException) as e:
        d.input_filename


def test_input_file_non_existing() -> None:
    with pytest.raises(errors.InputFileNotFoundException) as e:
        Document("non-existing-file.pdf")


# XXX: This is not easy to test on Windows, as the file owner can always read it.
# See also:
# https://stackoverflow.com/questions/72528318/what-file-permissions-make-a-file-unreadable-by-owner-in-windows
@pytest.mark.skipif(platform.system() == "Windows", reason="Unix-specific")
def test_input_file_unreadable(unreadable_pdf: str) -> None:
    with pytest.raises(errors.InputFileNotReadableException) as e:
        Document(unreadable_pdf)


@pytest.mark.skipif(platform.system() == "Windows", reason="Unix-specific")
def test_output_file_unwriteable_dir(sample_pdf: str, tmp_path: Path) -> None:
    # make parent dir unwriteable
    sample_pdf_safe = str(tmp_path / "document-safe.pdf")
    os.chmod(tmp_path, 0o400)
    with pytest.raises(errors.UnwriteableOutputDirException) as e:
        d = Document(sample_pdf, sample_pdf_safe)


def test_output(tmp_path: Path) -> None:
    pdf_file = str(tmp_path.joinpath("document.pdf"))
    d = Document()
    d.output_filename = pdf_file


def test_output_file_none() -> None:
    """
    Attempts to read a document's filename when no doc has been set
    """
    d = Document()
    with pytest.raises(errors.NotSetOutputFilenameException) as e:
        d.output_filename


def test_output_file_not_pdf(tmp_path: Path) -> None:
    docx_file = str(tmp_path / "document.docx")
    d = Document()

    with pytest.raises(errors.NonPDFOutputFileException) as e:
        d.output_filename = docx_file

    assert not os.path.exists(docx_file)


@pytest.mark.skipif(platform.system() == "Windows", reason="Unix-specific")
def test_archive_unwriteable_dir(tmp_path: Path) -> None:
    doc = tmp_path / "doc.pdf"
    Path.touch(doc)
    d = Document(str(doc))

    # make archive directory unreadable
    os.chmod(tmp_path, 0o400)

    with pytest.raises(errors.UnwriteableArchiveDirException) as e:
        d.validate_default_archive_dir()


def test_archive(mocker: MagicMock, tmp_path: Path) -> None:
    original_doc_path = str(tmp_path / "doc.pdf")
    archived_doc_path = str(tmp_path / ARCHIVE_SUBDIR / "doc.pdf")

    # Perform the archival operation two times: one with no archive dir, and one with an
    # archive dir.
    test_strings = ["original file 1", "original file 2"]
    for test_string in test_strings:
        # write some content for later verifying content integrity
        with open(original_doc_path, "w") as f:
            f.write(test_string)

        # archive the document
        d = Document(original_doc_path, archive=True)
        d.archive()

        # original document has been moved to unsafe/doc.pdf
        assert not os.path.exists(original_doc_path)
        assert os.path.exists(archived_doc_path)

        # make sure it is the proper file by comparing its content
        with open(archived_doc_path) as f:
            assert f.read() == test_string


def test_set_output_dir(sample_pdf: str, tmp_path: Path) -> None:
    d = Document(sample_pdf)
    d.set_output_dir(str(tmp_path))
    assert os.path.dirname(d.output_filename) == str(tmp_path)


def test_set_output_dir_non_existant(sample_pdf: str, tmp_path: Path) -> None:
    non_existant_path = str(tmp_path / "fake-dir")
    d = Document(sample_pdf)
    with pytest.raises(errors.NonExistantOutputDirException):
        d.set_output_dir(non_existant_path)


def test_set_output_dir_is_file(sample_pdf: str, tmp_path: Path) -> None:
    # create a file
    file_path = str(tmp_path / "file")
    with open(file_path, "w"):
        pass

    d = Document(sample_pdf)
    with pytest.raises(errors.OutputDirIsNotDirException):
        d.set_output_dir(file_path)


def test_default_output_filename(sample_pdf: str) -> None:
    d = Document(sample_pdf)
    assert d.output_filename.endswith(SAFE_EXTENSION)


def test_set_output_filename_suffix(sample_pdf: str) -> None:
    d = Document(sample_pdf)
    safe_extension = "-trusted.pdf"
    d.suffix = safe_extension
    assert d.output_filename.endswith(safe_extension)

    d.output_filename = "something_else.pdf"
    with pytest.raises(errors.SuffixNotApplicableException) as e:
        d.suffix = "-new-trusted.pdf"


def test_is_unconverted_by_default(sample_pdf: str) -> None:
    d = Document(sample_pdf)
    assert d.is_unconverted()


def test_mark_as_safe(sample_pdf: str) -> None:
    d = Document(sample_pdf)
    d.mark_as_safe()
    assert d.is_safe()
    assert not d.is_failed()
    assert not d.is_unconverted()


def test_mark_as_converting(sample_pdf: str) -> None:
    d = Document(sample_pdf)
    d.mark_as_converting()
    assert d.is_converting()


def test_mark_as_failed(sample_pdf: str) -> None:
    d = Document(sample_pdf)
    d.mark_as_failed()
    assert d.is_failed()
    assert not d.is_safe()
    assert not d.is_unconverted()