from django.contrib.auth import get_user_model
from django.urls import reverse
from django.test import TestCase

from rest_framework import status
from rest_framework.test import APIClient

from core.models import Tag, Recipe
from recipe.serializers import TagSerializer


# endpoints
TAGS_URL = reverse('recipe:tag-list')


class PublicTagsApiTest(TestCase):
    def setUp(self):
        self.client = APIClient()

    def test_login_required(self):
        res = self.client.get(TAGS_URL)

        self.assertEqual(res.status_code, status.HTTP_401_UNAUTHORIZED)


class PrivateTagsApiTest(TestCase):
    def setUp(self):
        self.user = get_user_model().objects.create_user(
            'testuwu@gmail.com',
            'password123'
        )
        self.client = APIClient()
        self.client.force_authenticate(self.user)


    def test_retrieve_tags(self):
        Tag.objects.create(user=self.user, name='Meat')
        Tag.objects.create(user=self.user, name='Banana')

        res = self.client.get(TAGS_URL)

        tags = Tag.objects.all().order_by('-name')
        serializer = TagSerializer(tags, many=True)
        
        self.assertEqual(res.status_code, status.HTTP_200_OK)
        self.assertEqual(res.data, serializer.data)


    def test_tags_limited_to_user(self):
        # test that retrieved tags are from the request user
        user2 = get_user_model().objects.create_user(
            'user2@gmail.com',
            'verysafepassword'
        )

        Tag.objects.create(user=user2, name='Raspberry')
        tag = Tag.objects.create(user=self.user, name='Comfort Food')

        res = self.client.get(TAGS_URL)     

        self.assertEqual(res.status_code, status.HTTP_200_OK)
        self.assertEqual(len(res.data), 1)
        self.assertEqual(res.data[0]['name'], tag.name)


    def test_create_tag_successful(self):
        payload = { 'name': 'Simple' }
        self.client.post(TAGS_URL, payload)

        exists = Tag.objects.filter(
            user=self.user,
            name=payload['name']
        ).exists()

        self.assertTrue(exists)


    def test_create_tag_invalid(self):
        payload = { 'name': '' }
        res = self.client.post(TAGS_URL, payload)

        self.assertEqual(res.status_code, status.HTTP_400_BAD_REQUEST)

    
    def test_retrieve_tags_assigned_to_recipes(self):
        tag1 = Tag.objects.create(user=self.user, name='Breakfast')
        tag2 = Tag.objects.create(user=self.user, name='Dinner')
        recipe = Recipe.objects.create(
            title = 'Coriander eggs',
            time_minutes = 10,
            price = 5.00,
            user = self.user
        )
        recipe.tags.add(tag1)

        res = self.client.get(TAGS_URL, {'assigned_only': 1})

        serializer1 = TagSerializer(tag1)
        serializer2 = TagSerializer(tag2)

        self.assertIn(serializer1.data, res.data)
        self.assertNotIn(serializer2.data, res.data)


    def test_retrieve_tags_assigned_unique(self):
        tag = Tag.objects.create(user=self.user, name='Breakfast')
        recipe1 = Recipe.objects.create(
            title = 'Pancakes',
            time_minutes = 10,
            price = 3.00,
            user = self.user
        )
        recipe1.tags.add(tag)
        recipe2 = Recipe.objects.create(
            title = 'Tacos',
            time_minutes = 20,
            price = 2.00,
            user = self.user
        )
        recipe2.tags.add(tag)

        res = self.client.get(TAGS_URL, {'asigned_only': 1}) 

        self.assertEqual(len(res.data), 1)
