class Logger(object):
    """
    Debug Info.
    """
    LOG_LEVEL = 1 # 0 means all, 1 means all but DEBUG, 2 means all but INFO and DEBUG, 3 only FATAL

    @classmethod
    def Debug(cls, msg):
        """
        Prints an information message to the standard output.
        
        :param msg: str -- The message to be printed.
        
        """
        if cls.LOG_LEVEL <= 0:
            cls.__log("[DEBUG]", msg)


    @classmethod
    def Info(cls, msg):
        """
        Prints an information message to the standard output.
        
        :param msg: str -- The message to be printed.
        
        """
        if cls.LOG_LEVEL <= 1:
            cls.__log("[INFO]", msg)

    
    @classmethod
    def Warning(cls, msg):
        """
        Prints a warning message to the standard output.
        
        :param msg: str -- The message to be printed.
        
        """
        if cls.LOG_LEVEL <= 2:
            cls.__log("[WARNING]", msg)
        
    
    @classmethod
    def FatalError(cls, msg):
        """
        Prints an error message to the standard output.
        
        :param msg: str -- The message to be printed.
        :raises: Exception.
        
        """
        if cls.LOG_LEVEL <= 3:
            cls.__log("[FATAL]", msg)
            raise Exception(msg)

    @classmethod
    def __log(cls, typ, msg):
        print "%s: %s" % (typ, msg)
      
def trQ(tag, context="CURVEPLOT"):
  """ @return a QString read from the translation file """
  from pyqtside.QtGui import QApplication 
  return QApplication.translate(context, tag) 

def trU(tag, context="CURVEPLOT"):
  """ @return same as above, but returns a Python unicode string.  """
  qs = trQ(tag, context)
  return unicode(qs, 'utf-8')

def toUnicodeWithWarning(s, method_name):
  try: 
    s = unicode(s)
  except:
    Logger.Warning("%s - warning, passing non-unicode, non-ASCII string '%s'! Trying to convert myself to UTF-8 ..." % (method_name, s))
    s = unicode(s, 'utf-8')
  return s

def completeResPath(fileName):
  import os
  subPath = "@SALOME_CURVEPLOT_INSTALL_PYTHON@"
  rd = os.environ.get("CURVEPLOT_ROOT_DIR", None)
  if rd is None:
    raise Exception("CURVEPLOT_ROOT_DIR is not defined!")
  filePath = os.path.join(rd, subPath, fileName)
  return filePath