import os.path
import pathlib



from boltons import fileutils
from boltons.fileutils import FilePerms, iter_find_files
from boltons.strutils import removeprefix


BOLTONS_PATH = os.path.dirname(os.path.abspath(fileutils.__file__))


def test_fileperms():
    up = FilePerms()
    up.other = ''
    up.user = 'xrw'
    up.group = 'rrrwx'
    try:
        up.other = 'nope'
    except ValueError:
        # correctly raised ValueError on invalid chars
        pass

    assert repr(up) == "FilePerms(user='rwx', group='rwx', other='')"
    assert up.user == 'rwx'
    assert oct(int(up)) == '0o770'

    assert int(FilePerms()) == 0


def test_atomicsaver_pathlike(tmp_path):
    dest = tmp_path / 'output.bin'
    with fileutils.AtomicSaver(dest) as f:
        f.write(b'pathlike works')
    assert dest.read_bytes() == b'pathlike works'


def test_iter_find_files_pathlike():
    boltons_path = pathlib.Path(BOLTONS_PATH)
    results = list(iter_find_files(boltons_path, patterns=['*.py']))
    basenames = [os.path.basename(p) for p in results]
    assert 'fileutils.py' in basenames


def test_iter_find_files():
    def _to_baseless_list(paths):
        return [removeprefix(p, BOLTONS_PATH).lstrip(os.path.sep) for p in paths]

    assert 'fileutils.py' in _to_baseless_list(iter_find_files(BOLTONS_PATH, patterns=['*.py']))

    boltons_parent = os.path.dirname(BOLTONS_PATH)
    assert 'fileutils.py' in _to_baseless_list(iter_find_files(boltons_parent, patterns=['*.py']))
    assert 'fileutils.py' not in _to_baseless_list(iter_find_files(boltons_parent, patterns=['*.py'], max_depth=0))


def test_rotate_file_no_rotation(tmp_path):
    file_path = tmp_path / 'test_file.txt'
    fileutils.rotate_file(file_path)
    assert not file_path.exists()


def test_rotate_file_one_rotation(tmp_path):
    file_path = tmp_path / 'test_file.txt'
    file_path.write_text('test content')
    assert file_path.exists()

    fileutils.rotate_file(file_path)
    assert not file_path.exists()
    assert (tmp_path / 'test_file.1.txt').exists()


def test_rotate_file_full_rotation(tmp_path):
    file_path = tmp_path / 'test_file.txt'
    file_path.write_text('test content 0')
    for i in range(1, 5):
        cur_path = tmp_path / f'test_file.{i}.txt'
        cur_path.write_text(f'test content {i}')
        assert cur_path.exists()

    fileutils.rotate_file(file_path, keep=5)
    assert not file_path.exists()

    for i in range(1, 5):
        cur_path = tmp_path / f'test_file.{i}.txt'
        assert cur_path.read_text() == f'test content {i-1}'

    assert not (tmp_path / 'test_file.5.txt').exists()

def test_rotate_file_full_rotation_no_ext(tmp_path):
    file_path = tmp_path / 'test_file'
    file_path.write_text('test content 0')
    for i in range(1, 5):
        cur_path = tmp_path / f'test_file.{i}'
        cur_path.write_text(f'test content {i}')
        assert cur_path.exists()

    fileutils.rotate_file(file_path, keep=5)
    assert not file_path.exists()

    for i in range(1, 5):
        cur_path = tmp_path / f'test_file.{i}'
        assert cur_path.read_text() == f'test content {i-1}'

    assert not (tmp_path / 'test_file.5').exists()