from __future__ import unicode_literals

import os.path
import stat

import pytest

from pre_commit.util import CalledProcessError
from pre_commit.util import clean_path_on_failure
from pre_commit.util import cmd_output
from pre_commit.util import parse_version
from pre_commit.util import rmtree
from pre_commit.util import tmpdir


def test_CalledProcessError_str():
    error = CalledProcessError(
        1, [str('git'), str('status')], 0, (str('stdout'), str('stderr')),
    )
    assert str(error) == (
        "Command: ['git', 'status']\n"
        'Return code: 1\n'
        'Expected return code: 0\n'
        'Output: \n'
        '    stdout\n'
        'Errors: \n'
        '    stderr\n'
    )


def test_CalledProcessError_str_nooutput():
    error = CalledProcessError(
        1, [str('git'), str('status')], 0, (str(''), str('')),
    )
    assert str(error) == (
        "Command: ['git', 'status']\n"
        'Return code: 1\n'
        'Expected return code: 0\n'
        'Output: (none)\n'
        'Errors: (none)\n'
    )


def test_clean_on_failure_noop(in_tmpdir):
    with clean_path_on_failure('foo'):
        pass


def test_clean_path_on_failure_does_nothing_when_not_raising(in_tmpdir):
    with clean_path_on_failure('foo'):
        os.mkdir('foo')
    assert os.path.exists('foo')


def test_clean_path_on_failure_cleans_for_normal_exception(in_tmpdir):
    class MyException(Exception):
        pass

    with pytest.raises(MyException):
        with clean_path_on_failure('foo'):
            os.mkdir('foo')
            raise MyException

    assert not os.path.exists('foo')


def test_clean_path_on_failure_cleans_for_system_exit(in_tmpdir):
    class MySystemExit(SystemExit):
        pass

    with pytest.raises(MySystemExit):
        with clean_path_on_failure('foo'):
            os.mkdir('foo')
            raise MySystemExit

    assert not os.path.exists('foo')


def test_tmpdir():
    with tmpdir() as tempdir:
        assert os.path.exists(tempdir)
    assert not os.path.exists(tempdir)


def test_cmd_output_exe_not_found():
    ret, out, _ = cmd_output('i-dont-exist', retcode=None)
    assert ret == 1
    assert out == 'Executable `i-dont-exist` not found'


def test_parse_version():
    assert parse_version('0.0') == parse_version('0.0')
    assert parse_version('0.1') > parse_version('0.0')
    assert parse_version('2.1') >= parse_version('2')


def test_rmtree_read_only_directories(tmpdir):
    """Simulates the go module tree.  See #1042"""
    tmpdir.join('x/y/z').ensure_dir().join('a').ensure()
    mode = os.stat(str(tmpdir.join('x'))).st_mode
    mode_no_w = mode & ~(stat.S_IWUSR | stat.S_IWGRP | stat.S_IWOTH)
    tmpdir.join('x/y/z').chmod(mode_no_w)
    tmpdir.join('x/y/z').chmod(mode_no_w)
    tmpdir.join('x/y/z').chmod(mode_no_w)
    rmtree(str(tmpdir.join('x')))