from http import HTTPStatus

from django.contrib.auth import get_user_model
from django.test import Client, TestCase
from django.urls import reverse
from pytils.translit import slugify

from notes.models import Note
from notes.forms import WARNING


class LogicTest(TestCase):
    @classmethod
    def setUpTestData(cls):
        cls.User = get_user_model()

    def setUp(self):
        self.client = Client()
        self.author = self.User.objects.create_user(
            username='author',
            password='password'
        )
        self.author_client = Client()
        self.author_client.force_login(self.author)
        self.form_data = {
            'title': 'Test Note',
            'text': 'Test Text',
            'slug': 'test-note'
        }
        self.note = Note.objects.create(
            title='Existing Note',
            text='Existing Text',
            slug='existing-note',
            author=self.author
        )

        self.urls = {
            'login': reverse('users:login'),
            'signup': reverse('users:signup'),
            'logout': reverse('users:logout'),
            'home': reverse('notes:home'),
            'add': reverse('notes:add'),
            'edit': reverse('notes:edit', args=(self.note.slug,)),
            'detail': reverse('notes:detail', args=(self.note.slug,)),
            'delete': reverse('notes:delete', args=(self.note.slug,)),
            'notes_list': reverse('notes:list'),
            'success': reverse('notes:success'),
        }
        self.login_redirect_url = f'{self.urls["login"]}?next='

    def test_user_can_create_note(self):
        url = self.urls['add']
        initial_notes_count = Note.objects.count()
        response = self.author_client.post(url, data=self.form_data)
        self.assertRedirects(response, self.urls['success'])
        self.assertEqual(Note.objects.count(), initial_notes_count + 1)
        new_note = Note.objects.get(slug=self.form_data['slug'])
        self.assertEqual(new_note.title, self.form_data['title'])
        self.assertEqual(new_note.text, self.form_data['text'])
        self.assertEqual(new_note.slug, self.form_data['slug'])
        self.assertEqual(new_note.author, self.author)

    def test_anonymous_user_cant_create_note(self):
        url = self.urls['add']
        initial_notes_count = Note.objects.count()
        response = self.client.post(url, data=self.form_data)
        expected_url = self.login_redirect_url + url
        self.assertRedirects(response, expected_url)
        self.assertEqual(Note.objects.count(), initial_notes_count)

    def test_not_unique_slug(self):
        url = self.urls['add']
        self.form_data['slug'] = self.note.slug
        initial_notes_count = Note.objects.count()
        response = self.author_client.post(url, data=self.form_data)
        self.assertFormError(
            response,
            'form',
            'slug',
            errors=(self.note.slug + WARNING)
        )
        self.assertEqual(Note.objects.count(), initial_notes_count)

    def test_empty_slug(self):
        url = self.urls['add']
        self.form_data.pop('slug')
        initial_notes_count = Note.objects.count()
        response = self.author_client.post(url, data=self.form_data)
        self.assertRedirects(response, self.urls['success'])
        self.assertEqual(Note.objects.count(), initial_notes_count + 1)

        expected_slug = slugify(self.form_data['title'])
        new_note = Note.objects.get(slug=expected_slug)

        self.assertEqual(new_note.slug, expected_slug)
        self.assertEqual(Note.objects.filter(slug=expected_slug).count(), 1)

    def test_author_can_edit_note(self):
        url = self.urls['edit']
        response = self.author_client.post(url, self.form_data)
        self.assertRedirects(response, self.urls['success'])
        self.note.refresh_from_db()
        self.assertEqual(self.note.title, self.form_data['title'])
        self.assertEqual(self.note.text, self.form_data['text'])
        self.assertEqual(self.note.slug, self.form_data['slug'])
        self.assertEqual(self.note.author, self.author)

    def test_other_user_cant_edit_note(self):
        other_user = self.User.objects.create_user(
            username='other',
            password='password'
        )
        other_user_client = Client()
        other_user_client.force_login(other_user)
        url = reverse('notes:edit', args=(self.note.slug,))
        response = other_user_client.post(url, self.form_data)
        self.assertEqual(response.status_code, HTTPStatus.NOT_FOUND)
        note_from_db = Note.objects.get(id=self.note.id)
        self.assertEqual(self.note.title, note_from_db.title)
        self.assertEqual(self.note.text, note_from_db.text)
        self.assertEqual(self.note.slug, note_from_db.slug)

    def test_author_can_delete_note(self):
        url = self.urls['delete']
        initial_notes_count = Note.objects.count()
        response = self.author_client.post(url)
        self.assertRedirects(response, self.urls['success'])
        self.assertEqual(Note.objects.count(), initial_notes_count - 1)

    def test_other_user_cant_delete_note(self):
        other_user = self.User.objects.create_user(
            username='other',
            password='password'
        )
        other_user_client = Client()
        other_user_client.force_login(other_user)
        url = reverse('notes:delete', args=(self.note.slug,))
        initial_notes_count = Note.objects.count()
        response = other_user_client.post(url)
        self.assertEqual(response.status_code, HTTPStatus.NOT_FOUND)
        self.assertEqual(Note.objects.count(), initial_notes_count)