import os.path
import sys
from unittest import mock

import pytest

import pre_commit.constants as C
from pre_commit.languages import python
from pre_commit.prefix import Prefix


def test_norm_version_expanduser():
    home = os.path.expanduser('~')
    if os.name == 'nt':  # pragma: nt cover
        path = r'~\python343'
        expected_path = fr'{home}\python343'
    else:  # pragma: nt no cover
        path = '~/.pyenv/versions/3.4.3/bin/python'
        expected_path = f'{home}/.pyenv/versions/3.4.3/bin/python'
    result = python.norm_version(path)
    assert result == expected_path


@pytest.mark.parametrize('v', ('python3.6', 'python3', 'python'))
def test_sys_executable_matches(v):
    with mock.patch.object(sys, 'version_info', (3, 6, 7)):
        assert python._sys_executable_matches(v)


@pytest.mark.parametrize('v', ('notpython', 'python3.x'))
def test_sys_executable_matches_does_not_match(v):
    with mock.patch.object(sys, 'version_info', (3, 6, 7)):
        assert not python._sys_executable_matches(v)


@pytest.mark.parametrize(
    ('exe', 'realpath', 'expected'), (
        ('/usr/bin/python3', '/usr/bin/python3.7', 'python3'),
        ('/usr/bin/python', '/usr/bin/python3.7', 'python3.7'),
        ('/usr/bin/python', '/usr/bin/python', None),
        ('/usr/bin/python3.6m', '/usr/bin/python3.6m', 'python3.6m'),
        ('v/bin/python', 'v/bin/pypy', 'pypy'),
    ),
)
def test_find_by_sys_executable(exe, realpath, expected):
    with mock.patch.object(sys, 'executable', exe):
        with mock.patch.object(os.path, 'realpath', return_value=realpath):
            with mock.patch.object(python, 'find_executable', lambda x: x):
                assert python._find_by_sys_executable() == expected


def test_healthy_types_py_in_cwd(tmpdir):
    with tmpdir.as_cwd():
        prefix = tmpdir.join('prefix').ensure_dir()
        prefix.join('setup.py').write('import setuptools; setuptools.setup()')
        prefix = Prefix(str(prefix))
        python.install_environment(prefix, C.DEFAULT, ())

        # even if a `types.py` file exists, should still be healthy
        tmpdir.join('types.py').ensure()
        assert python.healthy(prefix, C.DEFAULT) is True


def test_healthy_python_goes_missing(tmpdir):
    with tmpdir.as_cwd():
        prefix = tmpdir.join('prefix').ensure_dir()
        prefix.join('setup.py').write('import setuptools; setuptools.setup()')
        prefix = Prefix(str(prefix))
        python.install_environment(prefix, C.DEFAULT, ())

        exe_name = 'python' if sys.platform != 'win32' else 'python.exe'
        py_exe = prefix.path(python.bin_dir('py_env-default'), exe_name)
        os.remove(py_exe)

        assert python.healthy(prefix, C.DEFAULT) is False