from django.test import TestCase
from django.contrib.admin.sites import AdminSite

import eav
import sys
from eav.admin import *
from .models import Patient, M2MModel, ExampleModel
from eav.models import Attribute
from eav.forms import BaseDynamicEntityForm
from django.contrib import admin
from django.core.handlers.base import BaseHandler
from django.test.client import RequestFactory
from django.forms import ModelForm


class MockRequest(RequestFactory):
    def request(self, **request):
        "Construct a generic request object."
        request = RequestFactory.request(self, **request)
        handler = BaseHandler()
        handler.load_middleware()
        # BaseHandler_request_middleware is not set in Django2.0
        # and removed in Django2.1
        if sys.version_info[0] < 2:
            for middleware_method in handler._request_middleware:
                if middleware_method(request):
                    raise Exception("Couldn't create request mock object - "
                                    "request middleware returned a response")
        return request


class MockSuperUser:
    def __init__(self):
        self.is_active = True
        self.is_staff = True

    def has_perm(self, perm):
        return True


request = MockRequest().request()
request.user = MockSuperUser()


class PatientForm(ModelForm):
    class Meta:
        model = Patient
        fields = '__all__'


class M2MModelForm(ModelForm):
    class Meta:
        model = M2MModel
        fields = '__all__'


class Forms(TestCase):
    def setUp(self):
        eav.register(Patient)
        Attribute.objects.create(name='weight', datatype=Attribute.TYPE_FLOAT)
        Attribute.objects.create(name='color', datatype=Attribute.TYPE_TEXT)

        self.female = EnumValue.objects.create(value='Female')
        self.male = EnumValue.objects.create(value='Male')
        gender_group = EnumGroup.objects.create(name='Gender')
        gender_group.values.add(self.female, self.male)

        Attribute.objects.create(
            name='gender',
            datatype=Attribute.TYPE_ENUM,
            enum_group=gender_group
        )

        self.instance = Patient.objects.create(name='Jim Morrison')
        self.site = AdminSite()

    def test_fields(self):
        admin = BaseEntityAdmin(Patient, self.site)
        admin.form = BaseDynamicEntityForm
        view = admin.change_view(request, str(self.instance.pk))

        own_fields = 2
        adminform = view.context_data['adminform']

        self.assertEqual(
            len(adminform.form.fields), Attribute.objects.count() + own_fields
        )

    def test_valid_submit(self):
        self.instance.eav.color = 'Blue'
        form = PatientForm(self.instance.__dict__, instance=self.instance)
        jim = form.save()

        self.assertEqual(jim.eav.color, 'Blue')

    def test_invalid_submit(self):
        form = PatientForm(dict(color='Blue'), instance=self.instance)
        with self.assertRaises(ValueError):
            jim = form.save()

    def test_valid_enums(self):
        self.instance.eav.gender = self.female
        form = PatientForm(self.instance.__dict__, instance=self.instance)
        rose = form.save()

        self.assertEqual(rose.eav.gender, self.female)

    def test_m2m(self):
        m2mmodel = M2MModel.objects.create(name='name')
        model = ExampleModel.objects.create(name='name')
        form = M2MModelForm(dict(name='Lorem', models=[model.pk]), instance=m2mmodel)
        form.save()
        self.assertEqual(len(m2mmodel.models.all()), 1)