# -*- coding: utf-8 -*-
#
# diffoscope: in-depth comparison of files, archives, and directories
#
# Copyright © 2015 Jérémy Bobbio <lunar@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 shutil
import pytest

from diffoscope.config import Config
from diffoscope.comparators.gzip import GzipFile
from diffoscope.comparators.binary import FilesystemFile
from diffoscope.comparators.missing_file import MissingFile
from diffoscope.comparators.utils.specialize import specialize, is_direct_instance

from ..utils.data import load_fixture, get_data


gzip1 = load_fixture('test1.gz')
gzip2 = load_fixture('test2.gz')
gzip3 = load_fixture('debian-bug-876316-control.tar.gz')


def test_identification(gzip1):
    assert is_direct_instance(gzip1, GzipFile)


def test_fallback_recognizes(gzip3):
    # the below always-True assertion is just to document the fact that we
    # should identify it correctly regardless of any bugs in file(1)
    assert ("gzip" not in gzip3.magic_file_type or
            "gzip" in gzip3.magic_file_type)
    assert is_direct_instance(gzip3, GzipFile)


def test_no_differences(gzip1):
    difference = gzip1.compare(gzip1)
    assert difference is None


@pytest.fixture
def differences(gzip1, gzip2):
    return gzip1.compare(gzip2).details


def test_metadata(differences):
    assert differences[0].source1.startswith('filetype')
    assert differences[0].source2.startswith('filetype')
    expected_diff = get_data('gzip_metadata_expected_diff')
    assert differences[0].unified_diff == expected_diff


def test_content_source(differences):
    assert differences[1].source1 == 'test1'
    assert differences[1].source2 == 'test2'


def test_content_source_without_extension(tmpdir, gzip1, gzip2):
    path1 = str(tmpdir.join('test1'))
    path2 = str(tmpdir.join('test2'))
    shutil.copy(gzip1.path, path1)
    shutil.copy(gzip2.path, path2)
    gzip1 = specialize(FilesystemFile(path1))
    gzip2 = specialize(FilesystemFile(path2))
    difference = gzip1.compare(gzip2).details
    assert difference[1].source1 == 'test1-content'
    assert difference[1].source2 == 'test2-content'


def test_content_diff(differences):
    expected_diff = get_data('text_ascii_expected_diff')
    assert differences[1].unified_diff == expected_diff


def test_compare_non_existing(monkeypatch, gzip1):
    monkeypatch.setattr(Config(), 'new_file', True)
    difference = gzip1.compare(MissingFile('/nonexisting', gzip1))
    assert difference.source2 == '/nonexisting'
    assert difference.details[-1].source2 == '/dev/null'
