'''
Created on 21.11.2013

@author: rauchp
'''
class Config():
    _instance = None

    _confDic = {
               'mySQL_server': 'localhost',
               'mySQL_port': '3306',
               'mySQL_user': 'smoke',
               'mySQL_pass': 'KiWujcafAlor',
               'mySQL_database': 'smoke_test',
               'mySQL_table': 'battery',
               'flask_server': '0.0.0.0',
               'flask_port': '5000',
               'flask_debug': False,
               'config_debug' : False,
               'config_read' : False
               }

    def __new__(cls, *args, **kwargs):
        # http://stackoverflow.com/questions/42558/python-and-the-singleton-pattern
        if not cls._instance:
            cls._instance = super(Config, cls).__new__(
                                cls, *args, **kwargs)
        return cls._instance

    def readConf(self):
        if self._confDic['config_read']:
            return self._confDic

        try:
            confFile = open("config\ems.conf", "r")
            error = False
        except IOError:
            error = True

        if error:
            self._confDic.update({'error' : 'config/ems.conf not found'})
            return self._confDic

        for line in confFile:
            line = line.strip()
            if len(line) > 0 and not line[0] == "#":
                ident = line.split("=")
                for i in range(len(ident)):
                    ident[i] = ident[i].strip()
                val = ident[1].split("#")               #cut off comments
                val[0] = val[0].strip()
                val[0] = True if val[0] == 'True' else val[0]
                val[0] = False if val[0] == 'False' else val[0]
                self._confDic[ident[0]] = val[0]
        confFile.close()
        self._confDic['config_read'] = True
        if self._confDic['config_debug']:
            print ('config:\t', self._confDic)
        return self._confDic