import os
import re

from modules import shared
from modules.paths_internal import script_path, cwd


def natural_sort_key(s, regex=re.compile('([0-9]+)')):
    return [int(text) if text.isdigit() else text.lower() for text in regex.split(s)]


def listfiles(dirname):
    filenames = [os.path.join(dirname, x) for x in sorted(os.listdir(dirname), key=natural_sort_key) if not x.startswith(".")]
    return [file for file in filenames if os.path.isfile(file)]


def html_path(filename):
    return os.path.join(script_path, "html", filename)


def html(filename):
    path = html_path(filename)

    try:
        with open(path, encoding="utf8") as file:
            return file.read()
    except OSError:
        return ""


def walk_files(path, allowed_extensions=None):
    if not os.path.exists(path):
        return

    if allowed_extensions is not None:
        allowed_extensions = set(allowed_extensions)

    items = list(os.walk(path, followlinks=True))
    items = sorted(items, key=lambda x: natural_sort_key(x[0]))

    for root, _, files in items:
        for filename in sorted(files, key=natural_sort_key):
            if allowed_extensions is not None:
                _, ext = os.path.splitext(filename)
                if ext not in allowed_extensions:
                    continue

            if not shared.opts.list_hidden_files and ("/." in root or "\\." in root):
                continue

            yield os.path.join(root, filename)


def ldm_print(*args, **kwargs):
    if shared.opts.hide_ldm_prints:
        return

    print(*args, **kwargs)


def truncate_path(target_path, base_path=cwd):
    abs_target, abs_base = os.path.abspath(target_path), os.path.abspath(base_path)
    try:
        if os.path.commonpath([abs_target, abs_base]) == abs_base:
            return os.path.relpath(abs_target, abs_base)
    except ValueError:
        pass
    return abs_target