from flask import json

from accounting import Amount, Transaction, Posting, Account

class AccountingEncoder(json.JSONEncoder):

    def default(self, o):

        elif isinstance(o, Amount):

            return dict(

                __type__=o.__class__.__name__,

                amount=o.amount,

                symbol=o.symbol

            )

        return json.JSONEncoder.default(self, o)

class AccountingDecoder(json.JSONDecoder):

    def __init__(self):

        json.JSONDecoder.__init__(self, object_hook=self.dict_to_object)

        types = {c.__name__ : c for c in [Amount, Transaction, Posting,

                                          Account]}

        _type = d.pop('__type__')

        return types[_type](**d)