class Converter():
    def __init__(self, obj):
        self.obj = obj
        self.indentCount = 0
        self.currentVarNum = 0
        self.result = ''

    def indent(self, delta = 0):
        tabs = ''
        for i in range(self.indentCount + delta):
            tabs += '\t'
        return tabs

    def convert(self):
        for o in self.obj:
            self.convertObj(o)
        return self.result

    def convertObj(self, o, parent = None):
        if o['type'] == 'obj':
            if parent:
                parent['val'].append({
                    'key': o['key'],
                    'type': 'val',
                    'dataType': o['key'].upper()
                })
            self.currentVarNum = 0
            self.result += self.indent() +'message '+ o['key'] +' {\n'
            self.indentCount += 1
            for pair in o['val']:
                self.convertObj(pair, o)
            self.indentCount -= 1
            self.result += self.indent() + '}\n'
        elif o['type'] == 'val' and o['dataType'] != 'null':
            self.currentVarNum += 1
            self.result += self.indent() + 'required '+ o['dataType'] +' '+ o['key'] +' = '+ str(self.currentVarNum) +'\n'

    def error(message):
        raise Exception('[CONVERTER][ERROR] ' + message);