"""Helpers for filesystem-dependent tests.
"""
import os
import socket
import subprocess
import sys
from functools import partial
from itertools import chain

from .path import Path


def make_socket_file(path):
    # Socket paths are limited to 108 characters (sometimes less) so we
    # chdir before creating it and use a relative path name.
    cwd = os.getcwd()
    os.chdir(os.path.dirname(path))
    try:
        sock = socket.socket(socket.AF_UNIX)
        sock.bind(os.path.basename(path))
    finally:
        os.chdir(cwd)


def make_unreadable_file(path):
    Path(path).touch()
    os.chmod(path, 0o000)
    if sys.platform == "win32":
        # Once we drop PY2 we can use `os.getlogin()` instead.
        username = os.environ["USERNAME"]
        # Remove "Read Data/List Directory" permission for current user, but
        # leave everything else.
        args = ["icacls", path, "/deny", username + ":(RD)"]
        subprocess.check_call(args)


def get_filelist(base):
    def join(dirpath, dirnames, filenames):
        relative_dirpath = os.path.relpath(dirpath, base)
        join_dirpath = partial(os.path.join, relative_dirpath)
        return chain(
            (join_dirpath(p) for p in dirnames),
            (join_dirpath(p) for p in filenames),
        )

    return set(chain.from_iterable(
        join(*dirinfo) for dirinfo in os.walk(base)
    ))