from os import name, stat
from django.test import TestCase
from django.contrib.auth import get_user_model
from django.urls import reverse
from rest_framework.test import APIClient
from rest_framework import status


# like a constant for the url we are going to test
CREATE_USER_URL = reverse('user:create')

TOKEN_URL = reverse('user:token')

ME_URL = reverse('user:me')

def create_user(**params):
    return get_user_model().objects.create_user(**params)


class PublicUserApiTests(TestCase):

    def setUp(self):
        self.client = APIClient()

    def test_create_valid_user_success(self):
        payload = {
            'email':'testlondon@gmail.com',
            'password':'testpass',
            'name':'Test'
        }
        res = self.client.post(CREATE_USER_URL, payload)

        self.assertEqual(res.status_code, status.HTTP_201_CREATED)
        user = get_user_model().objects.get(**res.data)
        self.assertTrue(user.check_password(payload['password']))
        self.assertNotIn('password', res.data)

    def test_user_exist(self):
        payload = {
            'email':'testlondon@gmail.com',
            'password':'testpass',
            'name':'Test'
        }
        create_user(**payload)

        res = self.client.post(CREATE_USER_URL, payload)
        self.assertEqual(res.status_code, status.HTTP_400_BAD_REQUEST)

    def test_password_too_short(self):
        # password more than 5 chars
        # its not the same user since the database gets deleted every time we run the unit test
        payload = {
            'email':'testlondon@gmail.com',
            'password':'tes',
            'name':'Test'
        }
        res = self.client.post(CREATE_USER_URL, payload)
        self.assertEqual(res.status_code, status.HTTP_400_BAD_REQUEST)
        user_exists = get_user_model().objects.filter(
            email = payload['email']
        ).exists()
        self.assertFalse(user_exists)

    def test_create_token_for_user(self):
        # create that a token is created for a user
        payload = {
            'email':'testlondon@gmail.com',
            'password':'testpass',
            'name':'Test'
        }
        create_user(**payload)
        res = self.client.post(TOKEN_URL, payload)
        self.assertIn('token', res.data)
        self.assertEqual(res.status_code, status.HTTP_200_OK)

    def test_create_token_invalid_credentials(self):
        # token is not created if invalid credentials are given
        create_user(email ='testlondon@gmail.com', password = 'testpa121212', name='Test')
        payload = {
            'email':'testlondon@gmail.com',
            'password':'testpass',
            'name':'Test'
        }
        res = self.client.post(TOKEN_URL, payload)
        self.assertNotIn('token', res.data)
        self.assertEqual(res.status_code, status.HTTP_400_BAD_REQUEST)

    def test_create_token_no_user(self):
        payload = {
            'email':'testlondon@gmail.com',
            'password':'testpass',
            'name':'Test'
        }
        res = self.client.post(TOKEN_URL, payload)
        self.assertNotIn('token', res.data)
        self.assertEqual(res.status_code, status.HTTP_400_BAD_REQUEST)

    def test_create_token_missing_field(self):
        """
        test that email and password are required
        """
        res = self.client.post(TOKEN_URL, {'email':'one','password': ''})
        self.assertNotIn('token', res.data)
        self.assertEqual(res.status_code, status.HTTP_400_BAD_REQUEST)

    def test_retrieve_user_unauthorized(self):
        # authentication is required for users to access the url
        res = self.client.get(ME_URL)
        self.assertEqual(res.status_code, status.HTTP_401_UNAUTHORIZED)


class PrivateUserApiTests(TestCase):
    """Test API requests that require authentication"""

    def setUp(self):
        self.user = create_user(
            email='test@londonappdev.com',
            password='testpass',
            name='fname',
        )
        self.client = APIClient()
        self.client.force_authenticate(user=self.user)

    def test_retrieve_profile_success(self):
        """Test retrieving profile for logged in user"""
        res = self.client.get(ME_URL)

        self.assertEqual(res.status_code, status.HTTP_200_OK)
        self.assertEqual(res.data, {
            'name': self.user.name,
            'email': self.user.email,
        })

    def test_post_me_not_allowed(self):
        """Test that POST is not allowed on the me URL"""
        res = self.client.post(ME_URL, {})

        self.assertEqual(res.status_code, status.HTTP_405_METHOD_NOT_ALLOWED)

    def test_update_user_profile(self):
        """Test updating the user profile for authenticated user"""
        payload = {'name': 'new name', 'password': 'newpassword123'}

        res = self.client.patch(ME_URL, payload)

        self.user.refresh_from_db()
        self.assertEqual(self.user.name, payload['name'])
        self.assertTrue(self.user.check_password(payload['password']))
        self.assertEqual(res.status_code, status.HTTP_200_OK)