from django.test import TestCase
from .models import Item, List
import lxml.html

class HomePageTest(TestCase):
    def test_uses_home_template(self):
        response = self.client.get('/')
        self.assertTemplateUsed(response, 'apps/dashboard/home.html')

    def test_renders_input_form(self):
        response = self.client.get('/')
        parsed = lxml.html.fromstring(response.content)
        [form] = parsed.cssselect('form[method=POST]')
        self.assertEqual(form.get('action'), '/apps/dashboard/newlist')
        inputs = form.cssselect('input')
        self.assertIn('item_text', [input.get('name') for input in inputs])

class ListAndItemModelsTest(TestCase):
    def test_saving_and_retrieving_items(self):
        mylist = List()
        mylist.save()

        first_item = Item()
        first_item.text = "The first (ever) list item"
        first_item.list = mylist
        first_item.save()

        second_item = Item()
        second_item.text = "A sequel somehow better than the first"
        second_item.list = mylist
        second_item.save()

        saved_list = List.objects.get()
        self.assertEqual(saved_list, mylist)

        saved_items = Item.objects.all()
        self.assertEqual(saved_items.count(), 2)

        first_saved_item = saved_items[0]
        second_saved_item = saved_items[1]
        self.assertEqual(first_saved_item.text, "The first (ever) list item")
        self.assertEqual(first_saved_item.list, mylist)
        self.assertEqual(second_saved_item.text, "A sequel somehow better than the first")
        self.assertEqual(second_saved_item.list, mylist)

class DashViewTest(TestCase):
    def test_uses_list_template(self):
        mylist = List.objects.create()
        response = self.client.get(f'/apps/dashboard/{mylist.id}/')
        self.assertTemplateUsed(response, 'apps/dashboard/list.html')

    def test_renders_input_form(self):
        mylist = List.objects.create()
        response = self.client.get(f'/apps/dashboard/{mylist.id}/')
        parsed = lxml.html.fromstring(response.content)
        [form] = parsed.cssselect('form[method=POST]')
        self.assertEqual(form.get('action'), f"/apps/dashboard/{mylist.id}/add-item")
        inputs = form.cssselect('input')
        self.assertIn('item_text', [input.get('name') for input in inputs])

    def test_displays_only_items_for_that_list(self):
        # Given/Arrange
        correct_list = List.objects.create()
        Item.objects.create(text='itemey 1', list=correct_list)
        Item.objects.create(text='itemey 2', list=correct_list)
        other_list = List.objects.create()
        Item.objects.create(text='other list item', list=other_list)
        # When/Act
        response = self.client.get(f'/apps/dashboard/{correct_list.id}/')
        # Then/Assert
        self.assertContains(response, 'itemey 1')
        self.assertContains(response, 'itemey 2')
        self.assertNotContains(response, 'other list item')

class NewListTest(TestCase):
    def test_can_save_a_POST_request(self):
        self. client.post('/apps/dashboard/newlist', data={'item_text': 'A new list item'})
        self.assertEqual(Item.objects.count(), 1)
        new_item = Item.objects.get()
        self.assertEqual(new_item.text, 'A new list item')

    def test_redirects_after_POST(self):
        response = self.client.post('/apps/dashboard/newlist', data={'item_text': 'A new list item'})
        new_list = List.objects.get()
        self.assertRedirects(response, f'/apps/dashboard/{new_list.id}/')

class NewItemTest(TestCase):
    def test_can_save_a_POST_request_to_an_existing_list(self):
        other_list = List.objects.create()
        correct_list = List.objects.create()

        self.client.post(
            f'/apps/dashboard/{correct_list.id}/add-item',
            data={'item_text': 'A new item for an existing list'},
        )

        self.assertEqual(Item.objects.count(), 1)
        new_item = Item.objects.get()
        self.assertEqual(new_item.text, 'A new item for an existing list')
        self.assertEqual(new_item.list, correct_list)

    def test_redirects_to_list_view(self):
        other_list = List.objects.create()
        correct_list = List.objects.create()

        response = self.client.post(
            f'/apps/dashboard/{correct_list.id}/add-item',
            data={'item_text': 'A new item for an existing list'},
        )

        self.assertRedirects(response, f'/apps/dashboard/{correct_list.id}/')