import logging
import sys


def __singletion(cls):
    """
    單例模式的裝飾器函式
    :param cls: 實體類
    :return: 返回實體類物件
    """
    instances = {}
    def getInstance(*args, **kwargs):
        if cls not in instances:
            instances[cls] = cls(*args, **kwargs)
        return instances[cls]
    return getInstance


@__singletion
class C_Logger(object):
    def __init__(self, appName, logFileName, out=0):
        """
        獲取日誌處理物件
        :param appName: 應用程式名
        :param logFileName: 日誌檔名
        :param out: 設定輸出端：0：預設控制檯，1：輸入檔案，其他：控制檯和檔案都輸出
        :return: 返回日誌物件
        """
        self.appName = appName
        self.logFileName = logFileName
        self.out = out

    def getLogger(self):
        # 獲取logging例項
        logger = logging.getLogger(self.appName)
        # 指定輸出的格式
        formatter = logging.Formatter('%(name)s  %(asctime)s  %(levelname)-8s:%(message)s')

        # 檔案日誌
        file_handler = logging.FileHandler(self.logFileName, encoding='utf-8')
        file_handler.setFormatter(formatter)

        # 控制檯日誌
        console_handler = logging.StreamHandler(sys.stdout)
        console_handler.setFormatter(formatter)

        # # 指定日誌的最低輸出級別
        logger.setLevel(logging.INFO)  # 20

        # 為logger新增具體的日誌處理器輸出端
        if self.out == 1:
            logger.addHandler(file_handler)
        elif self.out == 0:
            logger.addHandler(console_handler)
        else:
            logger.addHandler(file_handler)
            logger.addHandler(console_handler)
        return logger