import os
os.environ['DJANGO_SETTINGS_MODULE'] = 'gravezoneapp.gravezoneapp.settings'

import json
from gravezoneapp.main.models import PayPalPayment



def required(field, value):
    s_boolean_true = ['true', '1']

    if field == '' or not field:
        result = False
    else:
        result = True

    parsed_value = value in s_boolean_true

    if parsed_value == result:
        return True
    else:
        return False


def length_min(field, value):
    if len(field) <= int(value):
        return False
    else:
        return True


class TornadoRequestWrapper():

    validators = {
        'required': required,
        'length_min': length_min
    }

    def __init__(self, model):
        self.model = model

    def validate(self, request):

        try:
            post_data = json.loads(request)
        except Exception as e:
            print e
            print "====="
            return False
        else:
            if 'meta_model' in self.model:
                self.meta_model = self.model['meta_model']

            for field in self.model["fields"]:
                try:
                    self.__dict__[field['name']] = post_data[field['name']]
                except KeyError as e:
                    print e, " field is required"
                    return
                else:
                    if 'validators' in field:
                        for validation, value in field['validators'].iteritems():
                            if not self.validators[validation](post_data[field['name']], value):
                                print "Validation error:", field['name'], validation
                                return False
            return True

    def api_list(self):
        if self.meta_model:
            res = []
            objects = self.meta_model.objects.all()
            for object in objects:
                res.append(object.to_json())

            return res

        else:
            return {}




model = {
    "meta_model": PayPalPayment,
    "fields":
    [
        {"name": "username", "validators": {"length_min": "4"}},
        {"name": "password", "validators": {"required": "true"}},
        {"name": "email"}
    ]
}


query = '{"username": "redrush", "password": "345345345", "email": "redrush85@ukr.net"}'
query1 = '{"username": "redrush", "password": "", "email": "redrush85@ukr.net"}'
query2 = '{"username": "red", "password": "tes_pwd", "email": "redrush85@ukr.net"}'
query3 = 'dfdfgdfgdfgd'


wrapper = TornadoRequestWrapper(model)



if wrapper.validate(query):
    print "Request is valid"
    print wrapper.username, wrapper.password, wrapper.email
    print wrapper.api_list()