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import sys
import logging as log
import os

from .Common import *

logLevelMap = { "trace" : log.DEBUG,
                "debug" : log.DEBUG,
                "info" : log.INFO,
                "warning" : log.WARNING,
                "error" : log.ERROR,
}

class ExitOnExceptionHandler(log.StreamHandler):
    def emit(self, record):
        super().emit(record)
        if record.levelno == log.CRITICAL:
            sys.exit(-1)

def DefaultLogTimestamp():
    log_format = os.environ.get('ROLL_LOG_TIMESTAMP')
    if log_format is not None and log_format != "":
        log_format = int(log_format)
        if log_format >= 0 and log_format <= 2:
            return log_format
        else:
            log.warn("Invalid value " + str(log_format) + " of environment variable ROLL_LOG_LEVEL")

    return 0

def DefaultLogLevel():

    log_level = os.environ.get('ROLL_LOG_LEVEL')
    if log_level is not None and log_level != "":
        if log_level in logLevelMap.keys():
            return log_level
        else:
            log.warn("Invalid value " + log_level + " of environment variable ROLL_LOG_LEVEL")

    if IsOsMac():
        return "debug"
    else:
        return "info"

def LogTimestampHelp():
    return "0: no timestamp, 1: [09:31AM], 2: [Sep 14 09:32:02]"

def LogLevelHelp():
    return "Log level: debug, info, warning, error"

def InitLog(log_level, log_timestamp):

    log.addLevelName(log.DEBUG,     "DEBU")
    log.addLevelName(log.INFO,      "INFO")
    log.addLevelName(log.WARNING,   "WARN")
    log.addLevelName(log.ERROR,     "ERRO")
    log.addLevelName(log.FATAL,     "FATA")

    # log.basicConfig(level=log.INFO, format='%(levelname).4s %(message)s')
    if log_timestamp == 0:
        log.basicConfig(handlers=[ExitOnExceptionHandler()], level=logLevelMap[log_level], format='%(levelname)s %(message)s', datefmt='%I:%M%p')
    elif log_timestamp == 1:
        log.basicConfig(handlers=[ExitOnExceptionHandler()], level=logLevelMap[log_level], format='%(levelname)s[%(asctime)s] %(message)s', datefmt='%I:%M%p')
    else:
        log.basicConfig(handlers=[ExitOnExceptionHandler()], level=logLevelMap[log_level], format='%(levelname)s[%(asctime)s] %(message)s', datefmt='%b %d %H:%M:%S')