import os.path

import pytest

from pre_commit.prefix import Prefix


def norm_slash(*args):
    return tuple(x.replace('/', os.sep) for x in args)


@pytest.mark.parametrize(
    ('prefix', 'path_end', 'expected_output'),
    (
        norm_slash('foo', '', 'foo'),
        norm_slash('foo', 'bar', 'foo/bar'),
        norm_slash('foo/bar', '../baz', 'foo/baz'),
        norm_slash('./', 'bar', 'bar'),
        norm_slash('./', '', '.'),
        norm_slash('/tmp/foo', '/tmp/bar', '/tmp/bar'),
    ),
)
def test_path(prefix, path_end, expected_output):
    instance = Prefix(prefix)
    ret = instance.path(path_end)
    assert ret == expected_output


def test_path_multiple_args():
    instance = Prefix('foo')
    ret = instance.path('bar', 'baz')
    assert ret == os.path.join('foo', 'bar', 'baz')


def test_exists(tmpdir):
    assert not Prefix(str(tmpdir)).exists('foo')
    tmpdir.ensure('foo')
    assert Prefix(str(tmpdir)).exists('foo')


def test_star(tmpdir):
    for f in ('a.txt', 'b.txt', 'c.py'):
        tmpdir.join(f).ensure()
    assert set(Prefix(str(tmpdir)).star('.txt')) == {'a.txt', 'b.txt'}