import os
from datetime import datetime


class Singleton:
    _instance = None

    def __init__(self):
        if not Singleton._instance:
            print("__init__ method called..")
        else:
            print("Instance already created:", self.getInstance())

    @classmethod
    def getInstance(cls):
        if not cls._instance:
            cls._instance = Singleton()
        return cls._instance


class TextFileWriter:
    def __init__(self, filepath):
        self.filepath = filepath
        if not os.path.exists(filepath):
            os.makedirs(filepath)

    def write_to_file(self, data):
        date_str = datetime.now().strftime('%Y-%m-%d')
        filename = f"{self.filepath}/{date_str}.txt"
        with open(filename, 'a') as file:  # 'a' 模式可以在文件存在的情况下继续写入内容
            file.write(data + '\n')