# log-console-file.py.

import logging
import sys
#from pathlib import Path


log_file = './log.file'
format = '%(filename)s:%(lineno)d  %(name)s:%(levelname)7s - %(message)s'

# Equivalent of '%(module)s)' format string.
#logger_name = Path( Path( __file__ ).name ).stem
#
logger_name = '/Effect of logger level/'
log = logging.getLogger( logger_name )


def show_log_file():
   print( f'\n# Contents of {log_file} ...' )
   with open( log_file, 'r', encoding = 'utf-8', errors = 'strict' ) as fh:
      for line in fh:
         print( line, end = '' )
   return


def set_handler( console_level, file_level ):
   # Default is "sys.stderr".
   stream_handler = logging.StreamHandler( sys.stdout )
   print( f'# Setting stream_handler level to {console_level}' )
   stream_handler.setLevel( console_level )

   file_handler = logging.FileHandler( log_file, mode = 'w' )
   print( f'# Setting file_handler level to {file_level}' )
   file_handler.setLevel( file_level )

   for handler in [ stream_handler, file_handler ]:
      handler.setFormatter( logging.Formatter( format ) )
      log.addHandler( handler )
   return


def remove_handler():
   if log.hasHandlers:
      log.handlers = list()
   return


for level in [ logging.DEBUG, logging.INFO, logging.WARNING, logging.ERROR ]:
   set_handler( logging.DEBUG, logging.INFO )

   print( f'# With log level {level} ...' )
   log.setLevel( level )

   log.debug( 'Debug until cannot debug no more' )
   log.info( 'Here, have some info' )
   log.warning( 'Oh Nose!' )
   log.error( 'BREAK GLASS!' )

   show_log_file()

   print( '- -' * 10 )
   remove_handler()