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# Reference: https://github.com/comfyanonymous/ComfyUI


import os
import time

supported_pt_extensions = {".ckpt", ".pt", ".bin", ".pth", ".safetensors"}

folder_names_and_paths = {}

# Will be assigned by modules.paths
base_path = None
models_dir = None

filename_list_cache = {}


def add_model_folder_path(folder_name, full_folder_path):
    global folder_names_and_paths
    if folder_name in folder_names_and_paths:
        folder_names_and_paths[folder_name][0].append(full_folder_path)
    else:
        folder_names_and_paths[folder_name] = ([full_folder_path], set())


def get_folder_paths(folder_name):
    return folder_names_and_paths[folder_name][0][:]


def recursive_search(directory, excluded_dir_names=None):
    if not os.path.isdir(directory):
        return [], {}

    if excluded_dir_names is None:
        excluded_dir_names = []

    result = []
    dirs = {}

    # Attempt to add the initial directory to dirs with error handling
    try:
        dirs[directory] = os.path.getmtime(directory)
    except FileNotFoundError:
        print(f"Warning: Unable to access {directory}. Skipping this path.")

    for dirpath, subdirs, filenames in os.walk(directory, followlinks=True, topdown=True):
        subdirs[:] = [d for d in subdirs if d not in excluded_dir_names]
        for file_name in filenames:
            relative_path = os.path.relpath(os.path.join(dirpath, file_name), directory)
            result.append(relative_path)

        for d in subdirs:
            path = os.path.join(dirpath, d)
            try:
                dirs[path] = os.path.getmtime(path)
            except FileNotFoundError:
                print(f"Warning: Unable to access {path}. Skipping this path.")
                continue
    return result, dirs


def filter_files_extensions(files, extensions):
    return sorted(list(filter(lambda a: os.path.splitext(a)[-1].lower() in extensions or len(extensions) == 0, files)))


def get_full_path(folder_name, filename):
    global folder_names_and_paths
    if folder_name not in folder_names_and_paths:
        return None
    folders = folder_names_and_paths[folder_name]
    filename = os.path.relpath(os.path.join("/", filename), "/")
    for x in folders[0]:
        full_path = os.path.join(x, filename)
        if os.path.isfile(full_path):
            return full_path

    return None


def get_filename_list_(folder_name):
    global folder_names_and_paths
    output_list = set()
    folders = folder_names_and_paths[folder_name]
    output_folders = {}
    for x in folders[0]:
        files, folders_all = recursive_search(x, excluded_dir_names=[".git"])
        output_list.update(filter_files_extensions(files, folders[1]))
        output_folders = {**output_folders, **folders_all}

    return (sorted(list(output_list)), output_folders, time.perf_counter())


def cached_filename_list_(folder_name):
    global filename_list_cache
    global folder_names_and_paths
    if folder_name not in filename_list_cache:
        return None
    out = filename_list_cache[folder_name]

    for x in out[1]:
        time_modified = out[1][x]
        folder = x
        if os.path.getmtime(folder) != time_modified:
            return None

    folders = folder_names_and_paths[folder_name]
    for x in folders[0]:
        if os.path.isdir(x):
            if x not in out[1]:
                return None

    return out


def get_filename_list(folder_name):
    out = cached_filename_list_(folder_name)
    if out is None:
        out = get_filename_list_(folder_name)
        global filename_list_cache
        filename_list_cache[folder_name] = out
    return list(out[0])