from django.contrib.auth.models import User
from ecommerce.models import Item, Order
from rest_framework.authtoken.models import Token
from rest_framework.test import APIClient
from rest_framework.test import APITestCase
from rest_framework import status


class EcommerceTestCase(APITestCase):
    """
    Conjunto de pruebas para Items y Orders
    """
    def setUp(self):

        Item.objects.create(title= "Demo item 1",description= "Descripción de prueba para item demo 1",price= 500,stock= 20)
        Item.objects.create(title= "Demo item 2",description= "Descripción de prueba para item demo 2",price= 700,stock= 15)
        Item.objects.create(title= "Demo item 3",description= "Descripción de prueba para item demo 3",price= 300,stock= 18)
        Item.objects.create(title= "Demo item 4",description= "Descripción de prueba para item demo 4",price= 400,stock= 14)
        Item.objects.create(title= "Demo item 5",description= "Descripción de prueba para item demo 5",price= 500,stock= 30)
        self.items = Item.objects.all()
        self.user = User.objects.create_user(
            username='testuser1',
            password='esta_es_una_prueba',
            email='testuser1@test.com'
        )
        Order.objects.create(item = Item.objects.first(), user = User.objects.first(), quantity=1)
        Order.objects.create(item = Item.objects.first(), user = User.objects.first(), quantity=2)

        #The app uses token authentication
        self.token = Token.objects.get(user = self.user)
        self.client = APIClient()

        #We pass the token in all calls to the API
        self.client.credentials(HTTP_AUTHORIZATION='Token ' + self.token.key)


    def test_get_all_items(self):
        '''
        test ItemsViewSet método list
        '''
        self.assertEqual(self.items.count(), 5)
        response = self.client.get('/item/')
        self.assertEqual(response.status_code, status.HTTP_200_OK)

    def test_get_one_item(self):
        '''
        test ItemsViewSet método retrieve
        '''
        for item in self.items:
            response = self.client.get(f'/item/{item.id}/')
            self.assertEqual(response.status_code, status.HTTP_200_OK)

    def test_order_is_more_than_stock(self):
        '''
        test Item.check_stock cuando order.quantity > item.stock
        '''
        for i in self.items:
            current_stock = i.stock
            self.assertEqual(i.check_stock(current_stock + 1), False)

    def test_order_equals_stock(self):
        '''
        test Item.check_stock cuando order.quantity == item.stock
        '''
        for i in self.items:
            current_stock = i.stock
            self.assertEqual(i.check_stock(current_stock), True)

    def test_order_is_less_than_stock(self):
        '''
        test Item.check_stock cuando order.quantity < item.stock
        '''
        for i in self.items:
            current_stock = i.stock
            self.assertTrue(i.check_stock(current_stock - 1), True)

    def test_create_order_with_more_than_stock(self):
        '''
        test OrdersViewSet método create cuando order.quantity > item.stock
        '''
        for i in self.items:
            stock = i.stock
            data = {"item": str(i.id), "quantity": str(stock+1)}
            response = self.client.post(f'/order/', data)
            self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)

    def test_create_order_with_less_than_stock(self):
        '''
        test OrdersViewSet método create cuando order.quantity < item.stock
        '''
        for i in self.items:
            data = {"item": str(i.id), "quantity": 1}
            response = self.client.post(f'/order/',data)
            self.assertEqual(response.status_code, status.HTTP_200_OK)

    def test_create_order_with_equal_stock(self):
        '''
        test OrdersViewSet método create cuando order.quantity == item.stock
        '''
        for i in self.items:
            stock = i.stock
            data = {"item": str(i.id), "quantity": str(stock)}
            response = self.client.post(f'/order/',data)
            self.assertEqual(response.status_code, status.HTTP_200_OK)

    def test_get_all_orders(self):
        '''
        test OrdersViewSet método list
        '''
        self.assertEqual(Order.objects.count(), 2)
        response = self.client.get('/order/')
        self.assertEqual(response.status_code, status.HTTP_200_OK)

    def test_get_one_order(self):
        '''
        test OrdersViewSet método retrieve
        '''
        orders = Order.objects.filter(user = self.user)
        for o in orders:
            response = self.client.get(f'/order/{o.id}/')
            self.assertEqual(response.status_code, status.HTTP_200_OK)