#!/usr/bin/env python3

"""LOGGER

"""


# Standard library imports
import logging
# https://docs.python.org/3/library/logging.handlers.html#module-logging.handlers
from logging.handlers import SMTPHandler, TimedRotatingFileHandler
import sys

# Third party imports
# None

# Local application imports
# None


logger = None


def get_console_handler():
    # Console should print ALL messages (starting from lower level DEBUG)
    c_handler = logging.StreamHandler(sys.stdout)
    c_handler.setLevel(logging.DEBUG)
    c_format = logging.Formatter('%(name)s - %(levelname)s - %(message)s')
    c_handler.setFormatter(c_format)
    return c_handler

def get_file_handler():
    # Log File should contain ONLY messages starting from level WARNING (ERROR ?)
    #f_handler = logging.FileHandler('file.log')
    f_handler = TimedRotatingFileHandler("file.log", when='midnight')
    f_handler.setLevel(logging.WARNING)
    # Create formatter and add it to handler
    #f_format = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    f_format = logging.Formatter('%(asctime)s - %(levelname)s - %(filename)s : %(lineno)s - %(message)s')
    f_handler.setFormatter(f_format)    
    return f_handler


def get_db_handler():
    # DB should contain ONLY messages starting from level ERROR
    # TODO:
    pass

def get_email_handler():
    # Email should be sent ONLY for messages starting from level CRITICAL
    # http://sametmax.com/envoi-dun-email-par-logging-en-cas-de-plantage-dun-script-python-ou-comment-faire-bouffer-uxe9-a-smtphandler/
    # TODO: a ameliorer avec article ci-dessus pour UNICODE
    m_handler = SMTPHandler(
        # Host et port
        ('SMTP.GMAIL.COM', 587),
        # From
        "MOI@GMAIL.COM",
        # To (liste)
        ["QUELQU.UN@QUELQUE.PART"],
        # Sujet du message
        "Erreur critique dans module MMM",
        # pour l'authentification
        credentials = ("MONEMAIL@GMAIL.COM", "MONSUPERPASSWORD"),
        secure = ()
    )
    m_handler.setLevel(logging.WARNING)
    m_format = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    m_handler.setFormatter(m_format)
    return m_handler


def get_logger(logger_name):
    global logger

    # Basic configuration
    '''
    #logging.basicConfig(level=logging.DEBUG)
    logging.basicConfig(level=logging.DEBUG, filename='client.log', filemode='a', format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    logging.debug("Client instanciated")
    '''

    # Advanced configuration
    # https://docs.python.org/3/library/logging.html#logging.getLogger
    #logger = logging.getLogger(__name__)
    logger = logging.getLogger(logger_name)

    # If not set, default level is NOTSET (all messages are logged)
    # The defined levels, in order of increasing severity : DEBUG, INFO, WARNING, ERROR, CRITICAL    
    logger.setLevel(logging.DEBUG) # better to have too much log than not enough

    # Create and add handlers to the logger
    logger.addHandler(get_console_handler())
    logger.addHandler(get_file_handler())
    # TODO:
    ##logger.addHandler(db_handler)
    ##logger.addHandler(m_handler)

    # with this pattern, it's rarely necessary to propagate the error up to parent
    ##logger.propagate = False
    return logger



# Shortcuts for logger:
#def log_d(msg:str): logger.debug(msg)
def log_d(msg:str, *args, **kwargs): logger.debug(msg, *args, **kwargs)
def log_i(msg:str, *args, **kwargs): logger.info(msg, *args, **kwargs)
def log_w(msg:str, *args, **kwargs): logger.warning(msg, *args, **kwargs)
def log_e(msg:str, *args, **kwargs): logger.error(msg, *args, **kwargs)
def log_c(msg:str, *args, **kwargs): logger.critical(msg, *args, **kwargs)




if __name__ == "__main__":
    my_logger = get_logger("my_module_name")
    my_logger.debug("a debug message")