import os
import shutil
import random

def select_random_file(directory):
    files = os.listdir(directory)
    if not files:
        raise FileNotFoundError("Каталог пустой")

    random_file = random.choice(files)
    return os.path.join(directory, random_file)

def copy_file_to_destination(source_file, destination_folder, new_filename="data.txt"):
    destination_path = os.path.join(destination_folder, new_filename)
    shutil.copy(source_file, destination_path)

def main():
    input_directory = "/var/data"
    output_directory = "/var/result"

    try:
        # Выбор случайного файла
        random_file_path = select_random_file(input_directory)

        # Копирование файла в целевой каталог
        copy_file_to_destination(random_file_path, output_directory)

        print(f"Копирован файл: {random_file_path} в {os.path.join(output_directory, 'data.txt')}")
    except FileNotFoundError as e:
        print(e)

if __name__ == "__main__":
    main()