import shutil
import tempfile
from unittest.mock import patch

from django.contrib.auth import get_user_model
from django.core.files.uploadedfile import SimpleUploadedFile
from django.test import TestCase, override_settings
from django.urls import reverse

from .models import ApiKey, Attachment, Collection, CollectionSection, Item, Tag, Team, TeamMembership, UserPreference
from .templatetags.markdown_extras import markdown, markdown_title
from .views import parse_due_command, parse_quick_content


class ItemMetadataTests(TestCase):
    def setUp(self):
        self.user = get_user_model().objects.create_user(username='tester', password='secret')

    def test_code_sections_are_ignored_when_extracting_tags(self):
        item = Item.objects.create(
            owner=self.user,
            content='Outside #real\n```python\n# fenced\n```\nInline `#inline` text',
        )
        item.sync_metadata()
        self.assertEqual(list(item.tags.values_list('name', flat=True)), ['real'])
        self.assertFalse(Tag.objects.filter(name__in=['fenced', 'inline']).exists())

    def test_unused_tags_are_removed_after_sync_and_delete(self):
        item = Item.objects.create(owner=self.user, content='#old')
        item.sync_metadata()
        item.content = '#new'
        item.save()
        item.sync_metadata()
        self.assertFalse(Tag.objects.filter(name='old').exists())
        self.assertTrue(Tag.objects.filter(name='new').exists())

        item.delete()
        self.assertFalse(Tag.objects.filter(name='new').exists())


class DefaultItemKindTests(TestCase):
    def setUp(self):
        self.user = get_user_model().objects.create_user(username='tester', password='secret')
        self.client.force_login(self.user)
        self.preferences = UserPreference.objects.create(user=self.user, default_item_kind=Item.Kind.TODO)

    def test_quick_create_uses_user_default(self):
        response = self.client.post(reverse('index'), {'content': 'Default task'})
        self.assertRedirects(response, reverse('index'))
        self.assertEqual(Item.objects.get().kind, Item.Kind.TODO)

    def test_explicit_command_overrides_default(self):
        kind, _, content, _ = parse_quick_content('/note Explicit note', Item.Kind.TODO)
        self.assertEqual(kind, Item.Kind.NOTE)
        self.assertEqual(content, 'Explicit note')

    def test_new_item_editor_uses_user_default(self):
        response = self.client.get(reverse('new_item'))
        self.assertEqual(response.context['requested_kind'], Item.Kind.TODO)


class DueDateCommandTests(TestCase):
    def setUp(self):
        self.user = get_user_model().objects.create_user(username='dates', password='secret')
        self.client.force_login(self.user)

    def test_datum_command_is_removed_and_parsed(self):
        cleaned, due_at, found = parse_due_command('/todo Call back /datum 20.10.26 14:30 #work')
        self.assertTrue(found)
        self.assertEqual(cleaned, '/todo Call back #work')
        self.assertEqual((due_at.year, due_at.month, due_at.day, due_at.hour, due_at.minute), (2026, 10, 20, 14, 30))

    def test_relative_command_sets_due_date_on_quick_create(self):
        response = self.client.post(reverse('index'), {'content': '/todo Call back /morgen'})
        self.assertRedirects(response, reverse('index'))
        item = Item.objects.get()
        self.assertNotIn('/morgen', item.content)
        self.assertIsNotNone(item.due_at)

    def test_due_commands_inside_code_are_ignored(self):
        raw = '/todo Example\n```\n/morgen\n/datum 20.10.26\n```'
        cleaned, due_at, found = parse_due_command(raw)
        self.assertFalse(found)
        self.assertIsNone(due_at)
        self.assertEqual(cleaned, raw)

    def test_type_and_date_commands_are_available_in_menu(self):
        response = self.client.get(reverse('index'))
        self.assertContains(response, "{token:'/note'")
        self.assertContains(response, "{token:'/datum'")
        self.assertContains(response, 'queryStart')
        self.assertContains(response, "group:'Typ'")


class SlashMenuContextTests(TestCase):
    def test_type_command_only_counts_at_start(self):
        leading_kind, _, leading_content, _ = parse_quick_content('/todo Leading')
        later_kind, _, later_content, _ = parse_quick_content('Text /todo later')
        self.assertEqual(leading_kind, Item.Kind.TODO)
        self.assertEqual(leading_content, 'Leading')
        self.assertEqual(later_kind, Item.Kind.NOTE)
        self.assertEqual(later_content, 'Text /todo later')

    def test_visibility_commands_inside_code_are_ignored(self):
        kind, visibility, content, _ = parse_quick_content('/note Example ` /public `\n```\n/private\n```')
        self.assertEqual(kind, Item.Kind.NOTE)
        self.assertEqual(visibility, Item.Visibility.PRIVATE)
        self.assertIn('/public', content)
        self.assertIn('/private', content)

    @patch('core.views.fetch_page_title', return_value='Example page')
    def test_url_on_first_line_becomes_link_with_title_and_extra_text(self, _fetch_title):
        kind, _, content, url = parse_quick_content('https://example.com/page\nEigener Text #tag')
        self.assertEqual(kind, Item.Kind.LINK)
        self.assertEqual(url, 'https://example.com/page')
        self.assertEqual(content, 'Example page\nEigener Text #tag')

    @patch('core.views.fetch_page_title', return_value='Example page')
    def test_explicit_link_command_uses_first_line_url_title(self, _fetch_title):
        kind, _, content, url = parse_quick_content('/link https://example.com/page\n#tag')
        self.assertEqual(kind, Item.Kind.LINK)
        self.assertEqual(url, 'https://example.com/page')
        self.assertEqual(content, 'Example page\n#tag')


class MarkdownHeadingTests(TestCase):
    def test_tag_at_line_start_is_not_a_heading(self):
        rendered = str(markdown('#project starts here'))
        self.assertIn('<p>#project starts here</p>', rendered)
        self.assertNotIn('<h1>', rendered)

    def test_heading_with_space_remains_a_heading(self):
        self.assertIn('<h1>Project</h1>', str(markdown('# Project')))
        self.assertIn('<h2>Section</h2>', str(markdown('## Section')))

    def test_hash_in_fenced_code_is_unchanged(self):
        rendered = str(markdown('```python\n# comment\n```'))
        self.assertIn('# comment', rendered)
        self.assertNotIn('\\# comment', rendered)
        self.assertNotIn('<h1>', rendered)

    def test_hash_in_inline_code_is_not_a_heading(self):
        rendered = str(markdown('```# Das ist Kommentar im Code```'))
        self.assertIn('<code># Das ist Kommentar im Code</code>', rendered)
        self.assertNotIn('<h1>', rendered)

    def test_underline_is_allowed(self):
        self.assertIn('<u>underlined</u>', str(markdown('<u>underlined</u>')))

    def test_markdown_title_strips_heading_marker(self):
        self.assertEqual(markdown_title('## Ziel von my2dos\n\nText'), 'Ziel von my2dos')


class FormattingToolbarTests(TestCase):
    def test_toolbar_and_shortcuts_are_available(self):
        user = get_user_model().objects.create_user(username='formatting', password='secret')
        self.client.force_login(user)
        response = self.client.get(reverse('index'))
        self.assertContains(response, 'class="format-toolbar')
        self.assertContains(response, "formatSelection('bold')")
        self.assertContains(response, "u:'underline'")


class NavigationAndLayoutTests(TestCase):
    def setUp(self):
        self.user = get_user_model().objects.create_user(username='navigation', password='secret')
        self.preferences = UserPreference.objects.create(user=self.user)
        self.client.force_login(self.user)

    def test_desktop_navigation_contains_overview_hidden_links_and_kanban(self):
        self.preferences.show_notes = False
        self.preferences.save(update_fields=['show_notes'])
        response = self.client.get(reverse('index'))
        self.assertContains(response, 'd-none d-md-flex')
        self.assertContains(response, f'{reverse("index")}?kind=note')
        self.assertContains(response, reverse('kanban_list'))

    def test_preference_selects_are_stacked(self):
        response = self.client.get(reverse('settings'))
        preferences = response.content.decode().split('id="preferences"', 1)[1].split('name="due_first"', 1)[0]
        self.assertEqual(preferences.count('<div class="col-12"><label class="form-label">'), 3)

    def test_composer_menu_is_before_toolbar_and_file_controls(self):
        response = self.client.get(reverse('index'))
        html = response.content.decode()
        menu_position = html.index('composer-slash-menu')
        toolbar_position = html.index('format-toolbar', menu_position)
        file_position = html.index('desktop-file', toolbar_position)
        self.assertLess(menu_position, toolbar_position)
        self.assertLess(toolbar_position, file_position)


class AttachmentEditTests(TestCase):
    def setUp(self):
        self.media_root = tempfile.mkdtemp()
        self.override = override_settings(MEDIA_ROOT=self.media_root)
        self.override.enable()
        self.user = get_user_model().objects.create_user(username='attachment-editor', password='secret')
        self.client.force_login(self.user)

    def tearDown(self):
        self.override.disable()
        shutil.rmtree(self.media_root, ignore_errors=True)

    def test_uploaded_file_is_visible_after_first_inline_edit_save(self):
        item = Item.objects.create(owner=self.user, content='Original')
        uploaded = SimpleUploadedFile('hello.txt', b'hello', content_type='text/plain')

        response = self.client.post(reverse('edit_item', args=[item.id]), {
            'content': 'Original', 'comment': '', 'visibility': Item.Visibility.PRIVATE, 'url': '', 'files': uploaded,
        }, HTTP_HX_REQUEST='true')

        self.assertEqual(response.status_code, 200)
        self.assertEqual(item.attachments.count(), 1)
        self.assertContains(response, 'hello.txt')

    def test_existing_attachments_are_shown_and_can_be_deleted_in_editor(self):
        item = Item.objects.create(owner=self.user, content='Original')
        attachment = Attachment.objects.create(item=item, file=SimpleUploadedFile('duplicate.txt', b'duplicate', content_type='text/plain'))

        response = self.client.get(reverse('item_editor', args=[item.id]))
        self.assertContains(response, 'duplicate.txt')
        self.assertContains(response, 'name="delete_attachments"')

        response = self.client.post(reverse('item_editor', args=[item.id]), {
            'content': 'Original', 'comment': '', 'visibility': Item.Visibility.PRIVATE, 'url': '', 'delete_attachments': [str(attachment.id)],
        })

        self.assertRedirects(response, item.get_absolute_url())
        self.assertFalse(item.attachments.exists())

    def test_detail_editor_uses_original_return_url_not_partial_endpoint(self):
        item = Item.objects.create(owner=self.user, content='Original')
        response = self.client.get(f'{item.get_absolute_url()}?next=/')

        self.assertContains(response, f'{reverse("item_editor", args=[item.id])}?next=/')
        self.assertNotContains(response, reverse('item_card', args=[item.id]))


class TeamItemEditTests(TestCase):
    def setUp(self):
        self.user = get_user_model().objects.create_user(username='team-editor', password='secret')
        self.team = Team.objects.create(name='Docs team', slug='docs', owner=self.user)
        TeamMembership.objects.create(team=self.team, user=self.user, role=TeamMembership.Role.OWNER)
        self.client.force_login(self.user)

    def test_editing_team_item_preserves_team_link(self):
        item = Item.objects.create(
            owner=self.user, team=self.team, kind=Item.Kind.TODO,
            content='Original #docs', visibility=Item.Visibility.TEAM,
        )
        item.sync_metadata()

        response = self.client.post(reverse('edit_item', args=[item.id]), {
            'content': 'Updated #docs', 'comment': '', 'visibility': Item.Visibility.TEAM, 'url': '',
        })

        self.assertEqual(response.status_code, 200)
        item.refresh_from_db()
        self.assertEqual(item.team, self.team)
        self.assertEqual(item.visibility, Item.Visibility.TEAM)

    def test_team_visibility_is_selected_in_edit_forms(self):
        item = Item.objects.create(
            owner=self.user, team=self.team, content='Original #docs', visibility=Item.Visibility.TEAM,
        )
        response = self.client.get(reverse('edit_item', args=[item.id]))
        self.assertContains(response, '<option value="team" selected>', html=False)
        response = self.client.get(reverse('item_editor', args=[item.id]))
        self.assertContains(response, '<option value="team" selected>', html=False)

    def test_team_item_can_be_made_public_even_with_team_tag(self):
        item = Item.objects.create(
            owner=self.user, team=self.team, content='Original #docs', visibility=Item.Visibility.TEAM,
        )
        item.sync_metadata()

        response = self.client.post(reverse('item_editor', args=[item.id]), {
            'content': 'Updated #docs', 'comment': '', 'visibility': Item.Visibility.PUBLIC, 'url': '',
        })

        self.assertRedirects(response, item.get_absolute_url())
        item.refresh_from_db()
        self.assertEqual(item.visibility, Item.Visibility.PUBLIC)
        self.assertIsNone(item.team)


class CollectionTests(TestCase):
    def setUp(self):
        self.user = get_user_model().objects.create_user(username='collector', password='secret')
        self.client.force_login(self.user)

    def test_create_collection_and_add_compatible_note(self):
        response = self.client.post(reverse('collection_create'), {
            'title': 'Documentation', 'description': 'Guide', 'visibility': Item.Visibility.PRIVATE, 'mode': Collection.Mode.MANUAL,
        })
        collection = Collection.objects.get()
        self.assertRedirects(response, collection.get_absolute_url())
        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='Introduction')
        manage_url = reverse('collection_manage', args=[collection.id])
        response = self.client.post(manage_url, {'action': 'add', 'item_id': note.id})
        self.assertRedirects(response, manage_url)
        self.assertTrue(CollectionSection.objects.filter(collection=collection, item=note).exists())

    def test_public_note_can_be_added_to_private_collection_without_conversion(self):
        collection = Collection.objects.create(owner=self.user, title='Private guide', visibility=Item.Visibility.PRIVATE)
        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='Already public', visibility=Item.Visibility.PUBLIC)
        manage_url = reverse('collection_manage', args=[collection.id])
        response = self.client.post(manage_url, {'action': 'add', 'item_id': note.id})
        self.assertRedirects(response, manage_url)
        self.assertTrue(collection.sections.filter(item=note).exists())
        note.refresh_from_db()
        self.assertEqual(note.visibility, Item.Visibility.PUBLIC)

    def test_public_collection_asks_before_copying_private_note(self):
        collection = Collection.objects.create(owner=self.user, title='Public guide', visibility=Item.Visibility.PUBLIC)
        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='Private section')
        manage_url = reverse('collection_manage', args=[collection.id])
        response = self.client.post(manage_url, {'action': 'add', 'item_id': note.id})
        self.assertContains(response, 'name="mode" value="copy"')

        response = self.client.post(manage_url, {
            'action': 'confirm_add', 'item_id': note.id, 'mode': 'copy',
        })
        self.assertRedirects(response, manage_url)
        copied = collection.sections.get().item
        self.assertNotEqual(copied.id, note.id)
        self.assertEqual(copied.visibility, Item.Visibility.PUBLIC)
        note.refresh_from_db()
        self.assertEqual(note.visibility, Item.Visibility.PRIVATE)

    def test_note_used_by_collection_cannot_be_deleted(self):
        collection = Collection.objects.create(owner=self.user, title='Protected')
        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='Do not delete')
        CollectionSection.objects.create(collection=collection, item=note, position=0)
        response = self.client.post(reverse('delete_item', args=[note.id]))
        self.assertEqual(response.status_code, 409)
        self.assertTrue(Item.objects.filter(pk=note.id).exists())

    def test_team_selection_creates_team_collection(self):
        team = Team.objects.create(name='Docs team', slug='docs', owner=self.user)
        TeamMembership.objects.create(team=team, user=self.user, role=TeamMembership.Role.OWNER)
        response = self.client.post(reverse('collection_create'), {
            'title': 'Team guide', 'visibility': Item.Visibility.PRIVATE,
            'mode': Collection.Mode.MANUAL, 'team': team.id,
        })
        collection = Collection.objects.get()
        self.assertRedirects(response, collection.get_absolute_url())
        self.assertEqual(collection.team, team)
        self.assertEqual(collection.visibility, Item.Visibility.TEAM)

    def test_other_users_public_notes_are_not_offered_for_embedding(self):
        other = get_user_model().objects.create_user(username='other')
        public_note = Item.objects.create(owner=other, kind=Item.Kind.NOTE, content='External', visibility=Item.Visibility.PUBLIC)
        collection = Collection.objects.create(owner=self.user, title='Own collection')
        response = self.client.get(reverse('collection_manage', args=[collection.id]))
        self.assertNotContains(response, f'name="item_id" value="{public_note.id}"')

    def test_collection_form_separates_teams_and_content_tags(self):
        team = Team.objects.create(name='Docs team', slug='docs', owner=self.user)
        TeamMembership.objects.create(team=team, user=self.user, role=TeamMembership.Role.OWNER)
        Tag.objects.create(name='docs')
        note = Item.objects.create(owner=self.user, content='#ordinary')
        note.sync_metadata()
        response = self.client.get(reverse('collection_create'))
        form = response.context['form']
        self.assertEqual(list(form.fields['team'].queryset), [team])
        self.assertEqual(list(form.fields['filter_tags'].queryset.values_list('name', flat=True)), ['ordinary'])

    def test_tutorial_is_listed_but_chapter_is_hidden_from_collection_overview(self):
        tutorial = Collection.objects.create(owner=self.user, title='my2dos Tutorial', mode=Collection.Mode.TUTORIAL)
        chapter = Collection.objects.create(owner=self.user, title='my2dos Typen', mode=Collection.Mode.CHAPTER)

        response = self.client.get(reverse('collection_list'))

        self.assertContains(response, tutorial.title)
        self.assertNotIn(chapter, [entry['collection'] for entry in response.context['entries']])

    def test_collection_list_can_filter_collection_types(self):
        Collection.objects.create(owner=self.user, title='Manual', mode=Collection.Mode.MANUAL)
        Collection.objects.create(owner=self.user, title='Tutorial', mode=Collection.Mode.TUTORIAL)
        Collection.objects.create(owner=self.user, title='Tagged', mode=Collection.Mode.TAGS)
        Collection.objects.create(owner=self.user, title='Chapter', mode=Collection.Mode.CHAPTER)

        response = self.client.get(f'{reverse("collection_list")}?mode=chapter')

        self.assertEqual([entry['collection'].title for entry in response.context['entries']], ['Chapter'])

    def test_orphan_chapters_are_shown_as_warning(self):
        Collection.objects.create(owner=self.user, title='Lonely chapter', mode=Collection.Mode.CHAPTER)

        response = self.client.get(reverse('collection_list'))

        self.assertContains(response, 'Verwaiste Kapitel')
        self.assertContains(response, 'Lonely chapter')

    def test_tutorial_can_include_chapter_collection(self):
        tutorial = Collection.objects.create(owner=self.user, title='my2dos Tutorial', mode=Collection.Mode.TUTORIAL)
        chapter = Collection.objects.create(owner=self.user, title='my2dos Typen', mode=Collection.Mode.CHAPTER)
        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='## Todos')
        CollectionSection.objects.create(collection=chapter, item=note, position=0)
        manage_url = reverse('collection_manage', args=[tutorial.id])

        response = self.client.post(manage_url, {'action': 'add_collection', 'collection_id': chapter.id})

        self.assertRedirects(response, manage_url)
        self.assertTrue(tutorial.sections.filter(sub_collection=chapter).exists())
        response = self.client.get(tutorial.get_absolute_url())
        self.assertContains(response, '<h2>my2dos Typen</h2>', html=True)
        self.assertContains(response, '<h3>Todos</h3>', html=True)

    def test_collection_overview_is_available_on_mobile(self):
        response = self.client.get(reverse('collection_list'))

        self.assertNotContains(response, 'Collections are currently available on desktop only.')
        self.assertContains(response, 'Sammlungen')

    def test_collection_manage_links_to_note_editor_with_return_target(self):
        collection = Collection.objects.create(owner=self.user, title='Reading view')
        manage_url = reverse('collection_manage', args=[collection.id])

        response = self.client.get(manage_url)

        self.assertContains(response, f'{reverse("new_item")}?kind=note&collection={collection.id}&next={manage_url}')

    def test_create_note_for_collection_in_editor_adds_it_and_returns(self):
        collection = Collection.objects.create(owner=self.user, title='Reading view')
        manage_url = reverse('collection_manage', args=[collection.id])

        response = self.client.post(f'{reverse("new_item")}?kind=note&collection={collection.id}&next={manage_url}', {
            'collection': collection.id, 'next': manage_url, 'content': '## Fresh note #new',
        })

        note = Item.objects.get(content='## Fresh note #new')
        self.assertRedirects(response, manage_url)
        self.assertTrue(collection.sections.filter(item=note).exists())
        self.assertEqual(note.visibility, collection.visibility)
        self.assertEqual(list(note.tags.values_list('name', flat=True)), ['new'])

    def test_create_chapter_from_tutorial_manage_adds_and_opens_it(self):
        tutorial = Collection.objects.create(owner=self.user, title='my2dos Tutorial', mode=Collection.Mode.TUTORIAL)

        response = self.client.post(reverse('collection_manage', args=[tutorial.id]), {'action': 'create_chapter', 'title': 'Tags'})

        chapter = Collection.objects.get(title='Tags')
        self.assertEqual(chapter.mode, Collection.Mode.CHAPTER)
        self.assertTrue(tutorial.sections.filter(sub_collection=chapter).exists())
        self.assertRedirects(response, reverse('collection_manage', args=[chapter.id]))

    def test_collection_sections_can_be_reordered_by_position(self):
        collection = Collection.objects.create(owner=self.user, title='Reading view')
        first = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='First')
        second = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='Second')
        first_section = CollectionSection.objects.create(collection=collection, item=first, position=0)
        second_section = CollectionSection.objects.create(collection=collection, item=second, position=1)

        response = self.client.post(reverse('collection_manage', args=[collection.id]), {
            'action': 'move_to', 'section_id': second_section.id, 'position': 0,
        })

        self.assertRedirects(response, reverse('collection_manage', args=[collection.id]))
        self.assertEqual(list(collection.sections.order_by('position').values_list('id', flat=True)), [second_section.id, first_section.id])

    def test_collection_detail_is_available_on_mobile(self):
        collection = Collection.objects.create(owner=self.user, title='Mobile reading')
        response = self.client.get(collection.get_absolute_url())

        self.assertNotContains(response, 'Collections are currently available on desktop only.')
        self.assertContains(response, 'collection-document')

    def test_tag_collection_is_dynamic_and_sorted_by_creation(self):
        first = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='First #guide #basics')
        first.sync_metadata()
        Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='Ignored #guide').sync_metadata()
        second = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='Second #guide #basics')
        second.sync_metadata()
        collection = Collection.objects.create(owner=self.user, title='Automatic', mode=Collection.Mode.TAGS)
        collection.filter_tags.set(Tag.objects.filter(name__in=['guide', 'basics']))

        response = self.client.get(collection.get_absolute_url())
        html = response.content.decode()
        self.assertContains(response, 'Tag-Sammlung')
        self.assertLess(html.index('First'), html.index('Second'))
        self.assertNotContains(response, 'First #guide')
        self.assertNotContains(response, 'Second #guide')
        self.assertNotContains(response, 'Ignored')
        self.assertContains(response, reverse('collection_edit', args=[collection.id]))
        self.assertNotContains(response, reverse('collection_manage', args=[collection.id]))

        manage_response = self.client.get(reverse('collection_manage', args=[collection.id]))
        self.assertRedirects(manage_response, reverse('collection_edit', args=[collection.id]))

    def test_collection_opens_as_continuous_reading_view(self):
        collection = Collection.objects.create(owner=self.user, title='Reading view')
        first = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='First paragraph')
        second = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='Second paragraph')
        CollectionSection.objects.create(collection=collection, item=first, title='First', position=0)
        CollectionSection.objects.create(collection=collection, item=second, position=1)
        response = self.client.get(collection.get_absolute_url())
        self.assertContains(response, 'collection-flow')
        self.assertContains(response, reverse('collection_manage', args=[collection.id]))
        self.assertNotContains(response, 'Add existing note')
        self.assertNotContains(response, 'section_id')

    def test_collection_reading_view_hides_note_tags(self):
        collection = Collection.objects.create(owner=self.user, title='Reading view')
        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='## Section #tutorial\nText #my2dos and `#code`')
        CollectionSection.objects.create(collection=collection, item=note, position=0)
        response = self.client.get(collection.get_absolute_url())
        self.assertContains(response, '<h2>Section</h2>', html=True)
        self.assertContains(response, '<code>#code</code>', html=True)
        self.assertNotContains(response, '#tutorial')
        self.assertNotContains(response, '#my2dos')

    def test_collection_manage_links_note_editor_back_to_collection(self):
        collection = Collection.objects.create(owner=self.user, title='Reading view')
        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='## Section')
        CollectionSection.objects.create(collection=collection, item=note, position=0)
        manage_url = reverse('collection_manage', args=[collection.id])
        response = self.client.get(manage_url)
        self.assertContains(response, 'id="collection-manage"')
        self.assertContains(response, 'hx-boost="true"')
        self.assertContains(response, 'hx-swap="outerHTML show:none"')
        self.assertContains(response, f'{reverse("item_editor", args=[note.id])}?next={manage_url}')
        self.assertContains(response, 'href="#section-1">Section')

    def test_collection_manage_preserves_search_when_adding_note(self):
        collection = Collection.objects.create(owner=self.user, title='Reading view')
        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='Findable note')
        manage_url = reverse('collection_manage', args=[collection.id])

        response = self.client.post(f'{manage_url}?q=Findable', {'action': 'add', 'item_id': note.id})

        self.assertRedirects(response, f'{manage_url}?q=Findable')

    def test_collection_manage_marks_already_added_notes(self):
        collection = Collection.objects.create(owner=self.user, title='Reading view')
        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='Findable note')
        CollectionSection.objects.create(collection=collection, item=note, position=0)

        response = self.client.get(f'{reverse("collection_manage", args=[collection.id])}?q=Findable')

        self.assertContains(response, 'Bereits in dieser Sammlung')
        self.assertContains(response, '1× verwendet')
        self.assertContains(response, 'disabled')

    def test_collection_can_include_collection(self):
        parent = Collection.objects.create(owner=self.user, title='Parent')
        child = Collection.objects.create(owner=self.user, title='Child')
        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='## Child note #internal')
        CollectionSection.objects.create(collection=child, item=note, position=0)
        manage_url = reverse('collection_manage', args=[parent.id])

        response = self.client.post(manage_url, {'action': 'add_collection', 'collection_id': child.id})

        self.assertRedirects(response, manage_url)
        self.assertTrue(parent.sections.filter(sub_collection=child).exists())
        response = self.client.get(parent.get_absolute_url())
        self.assertContains(response, '<h2>Child</h2>', html=True)
        self.assertContains(response, '<h3>Child note</h3>', html=True)
        self.assertNotContains(response, '#internal')

    def test_collection_loop_is_rejected(self):
        parent = Collection.objects.create(owner=self.user, title='Parent')
        child = Collection.objects.create(owner=self.user, title='Child')
        CollectionSection.objects.create(collection=parent, sub_collection=child, position=0)
        manage_url = reverse('collection_manage', args=[child.id])

        response = self.client.post(manage_url, {'action': 'add_collection', 'collection_id': parent.id}, follow=True)

        self.assertContains(response, 'collection loop')
        self.assertFalse(child.sections.filter(sub_collection=parent).exists())

    def test_public_collection_cannot_include_private_collection(self):
        parent = Collection.objects.create(owner=self.user, title='Parent', visibility=Item.Visibility.PUBLIC)
        child = Collection.objects.create(owner=self.user, title='Child', visibility=Item.Visibility.PRIVATE)
        manage_url = reverse('collection_manage', args=[parent.id])

        response = self.client.post(manage_url, {'action': 'add_collection', 'collection_id': child.id}, follow=True)

        self.assertContains(response, 'incompatible visibility')
        self.assertFalse(parent.sections.filter(sub_collection=child).exists())

    def test_private_collection_can_include_public_collection(self):
        parent = Collection.objects.create(owner=self.user, title='Parent', visibility=Item.Visibility.PRIVATE)
        child = Collection.objects.create(owner=self.user, title='Child', visibility=Item.Visibility.PUBLIC)
        manage_url = reverse('collection_manage', args=[parent.id])

        response = self.client.post(manage_url, {'action': 'add_collection', 'collection_id': child.id})

        self.assertRedirects(response, manage_url)
        self.assertTrue(parent.sections.filter(sub_collection=child).exists())

    def test_public_collection_is_visible_without_login(self):
        collection = Collection.objects.create(owner=self.user, title='Public', visibility=Item.Visibility.PUBLIC)
        self.client.logout()
        response = self.client.get(collection.get_absolute_url())
        self.assertEqual(response.status_code, 200)
        self.assertNotContains(response, reverse('collection_manage', args=[collection.id]))

    def test_collection_tag_is_not_removed_as_unused(self):
        tag = Tag.objects.create(name='documentation')
        collection = Collection.objects.create(owner=self.user, title='Tagged', mode=Collection.Mode.TAGS)
        collection.filter_tags.add(tag)
        note = Item.objects.create(owner=self.user, content='#temporary')
        note.sync_metadata()
        note.content = ''
        note.save()
        note.sync_metadata()
        self.assertTrue(Tag.objects.filter(pk=tag.pk).exists())

    def test_api_cannot_make_collection_note_incompatible(self):
        collection = Collection.objects.create(owner=self.user, title='Public', visibility=Item.Visibility.PUBLIC)
        note = Item.objects.create(owner=self.user, kind=Item.Kind.NOTE, content='Published', visibility=Item.Visibility.PUBLIC)
        CollectionSection.objects.create(collection=collection, item=note, position=0)
        response = self.client.patch(
            reverse('api_item_detail', args=[note.id]),
            data='{"visibility":"private"}', content_type='application/json',
        )
        self.assertEqual(response.status_code, 409)
        note.refresh_from_db()
        self.assertEqual(note.visibility, Item.Visibility.PUBLIC)


class ApiItemFilterTests(TestCase):
    def setUp(self):
        self.user = get_user_model().objects.create_user(username='api-filter', password='secret')
        self.help_tag = Tag.objects.create(name='help')
        self.api_key = ApiKey.objects.create(owner=self.user, name='Help CLI')
        self.api_key.tags.add(self.help_tag)

    def create_item(self, content):
        item = Item.objects.create(owner=self.user, content=content)
        item.sync_metadata()
        return item

    def test_api_key_scope_and_request_tags_are_combined(self):
        matching = self.create_item('Keyboard shortcuts #help #tasten')
        self.create_item('Git help #help #git')
        self.create_item('Private keyboard note #tasten')

        response = self.client.get(
            reverse('api_items'), {'tag': 'tasten', 'tag_mode': 'all'},
            HTTP_X_API_KEY=self.api_key.token,
        )

        self.assertEqual(response.status_code, 200)
        ids = [item['id'] for item in response.json()['items']]
        self.assertEqual(ids, [matching.id])

    def test_api_items_supports_limit_and_search(self):
        self.create_item('First #help #shell')
        second = self.create_item('Second #help #shell keyboard')

        response = self.client.get(
            reverse('api_items'), {'tag': 'shell', 'q': 'keyboard', 'limit': '1'},
            HTTP_X_API_KEY=self.api_key.token,
        )

        self.assertEqual(response.status_code, 200)
        items = response.json()['items']
        self.assertEqual(len(items), 1)
        self.assertEqual(items[0]['id'], second.id)


class CopyButtonTests(TestCase):
    def test_item_has_copy_button_with_original_text(self):
        user = get_user_model().objects.create_user(username='tester', password='secret')
        item = Item.objects.create(owner=user, content='Text to copy')
        self.client.force_login(user)
        response = self.client.get(reverse('item_detail', args=[item.pk]))
        self.assertContains(response, 'class="copy-item')
        self.assertContains(response, 'Text to copy')