#
# diffoscope: in-depth comparison of files, archives, and directories
#
# Copyright © 2015 Jérémy Bobbio <lunar@debian.org>
# Copyright © 2015-2017, 2019-2020 Chris Lamb <lamby@debian.org>
#
# diffoscope is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# diffoscope is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with diffoscope.  If not, see <https://www.gnu.org/licenses/>.

import pytest
import subprocess

from diffoscope.config import Config
from diffoscope.comparators.missing_file import MissingFile
from diffoscope.comparators.iso9660 import Iso9660File

from ..utils.data import load_fixture, get_data
from ..utils.tools import skip_unless_tools_exist

iso1 = load_fixture("test1.iso")
iso2 = load_fixture("test2.iso")


def is_cdrtools():
    return b"Schilling" in subprocess.check_output(["isoinfo", "--version"])


def test_identification(iso1):
    assert isinstance(iso1, Iso9660File)


def test_no_differences(iso1):
    difference = iso1.compare(iso1)
    assert difference is None


@pytest.fixture
def differences(iso1, iso2):
    return iso1.compare(iso2).details


@skip_unless_tools_exist("isoinfo")
def test_iso9660_content(differences):
    if is_cdrtools():
        expected_diff = get_data("iso9660_content_expected_diff_cdrtools")
    else:
        expected_diff = get_data("iso9660_content_expected_diff")
    assert differences[0].unified_diff == expected_diff


@skip_unless_tools_exist("isoinfo")
def test_iso9660_rockridge(differences):
    if is_cdrtools():
        expected_diff = get_data("iso9660_rockridge_expected_diff_cdrtools")
    else:
        expected_diff = get_data("iso9660_rockridge_expected_diff")
    assert differences[1].unified_diff == expected_diff


@skip_unless_tools_exist("isoinfo")
def test_symlink(differences):
    assert differences[4].comment == "symlink"
    expected_diff = get_data("symlink_expected_diff")
    assert differences[4].unified_diff == expected_diff


@skip_unless_tools_exist("isoinfo")
def test_compressed_files(differences):
    assert differences[3].source1 == "text"
    assert differences[3].source2 == "text"
    expected_diff = get_data("text_ascii_expected_diff")
    assert differences[3].unified_diff == expected_diff


@skip_unless_tools_exist("isoinfo")
def test_compare_non_existing(monkeypatch, iso1):
    monkeypatch.setattr(Config(), "new_file", True)
    difference = iso1.compare(MissingFile("/nonexisting", iso1))
    assert difference.source2 == "/nonexisting"
    assert difference.details[-1].source2 == "/dev/null"
