from django.test import TestCase
from django.contrib.auth import get_user_model
from rest_framework.test import APIClient
from rest_framework import status
from django.conf import settings
from django.db import IntegrityError
import uuid


User = get_user_model()


class UserModelTests(TestCase):
    def setUp(self):
        self.user_data = {
            'email_address': 'Test@Example.com',
            'first_name': 'Test',
            'last_name': 'User',
            'date_of_birth': '1990-01-01',
        }

    def test_create_user_and_properties(self):
        user = User.objects.create_user(password='pass1234', **self.user_data)
        self.assertIsNotNone(user.pk)
        # email should be normalized by the manager (domain lowercased)
        self.assertEqual(user.email_address.lower(), 'test@example.com')
        # full_name property
        self.assertEqual(user.full_name, 'Test User')

    def test_create_superuser(self):
        su = User.objects.create_superuser(password='adminpass', **self.user_data)
        self.assertTrue(su.is_staff)
        self.assertTrue(su.pk)


class UserAPITests(TestCase):
    def setUp(self):
        self.client = APIClient()
        self.user = User.objects.create_user(
            password='pass1234',
            email_address='apiuser@example.com',
            first_name='API',
            last_name='User',
            date_of_birth='1995-05-05',
        )

    def test_list_users(self):
        url = '/api/users/'
        resp = self.client.get(url)
        self.assertEqual(resp.status_code, status.HTTP_200_OK)
        emails = [u.get('email_address') for u in resp.json()]
        self.assertIn(self.user.email_address, emails)

    def test_api_response_contains_expected_fields(self):
        url = '/api/users/'
        resp = self.client.get(url)
        self.assertEqual(resp.status_code, status.HTTP_200_OK)
        data = resp.json()
        self.assertTrue(len(data) >= 1)
        sample = data[0]
        expected_keys = {'id', 'uuid', 'email_address', 'first_name', 'last_name', 'bio', 'timezone', 'avatar_url'}
        self.assertTrue(expected_keys.issubset(set(sample.keys())))


class UserModelExtraTests(TestCase):
    def test_password_hashed_and_check(self):
        user = User.objects.create_user(email_address='hashme@example.com', password='secret123')
        self.assertNotEqual(user.password, 'secret123')
        self.assertTrue(user.check_password('secret123'))

    def test_uuid_and_id_auto_populated(self):
        u1 = User.objects.create_user(email_address='one@example.com', password='p')
        u2 = User.objects.create_user(email_address='two@example.com', password='p')
        self.assertIsNotNone(u1.uuid)
        self.assertIsInstance(u1.uuid, uuid.UUID)
        self.assertNotEqual(u1.uuid, u2.uuid)
        self.assertIsNotNone(u1.id)
        self.assertIsNotNone(u2.id)

    def test_default_fields(self):
        u = User.objects.create_user(email_address='defaults@example.com', password='p')
        self.assertEqual(u.bio, "")
        self.assertEqual(u.timezone, settings.TIME_ZONE)
        self.assertEqual(u.avatar_url, "")

    def test_unique_email_constraint(self):
        User.objects.create_user(email_address='dup@example.com', password='p')
        with self.assertRaises(IntegrityError):
            User.objects.create_user(email_address='dup@example.com', password='p')

    def test_create_user_without_email_raises(self):
        with self.assertRaises(ValueError):
            User.objects.create_user(email_address='', password='p')

    def test_date_of_birth_optional(self):
        u = User.objects.create_user(email_address='nodob@example.com', password='p')
        self.assertIsNone(u.date_of_birth)

    def test_str_and_full_name(self):
        u = User.objects.create_user(email_address='name@example.com', password='p', first_name='A', last_name='B')
        self.assertEqual(u.full_name, 'A B')
        self.assertEqual(str(u), 'A B')

    def test_create_superuser_defaults(self):
        su = User.objects.create_superuser(email_address='admin@example.com', password='admin')
        self.assertTrue(su.is_staff)
        self.assertTrue(su.is_active)