"""
Integration tests for notification system.

These tests verify the integration between notifications and other components
like signals, permissions, and actual notification delivery.
"""
from unittest.mock import Mock, patch, MagicMock, call
import pytest
from datetime import datetime


class TestNotificationSignalIntegration:
    """Test notification creation via signal handlers."""

    def test_create_notification_from_ticket_assignment(self):
        """Test creating notification when ticket is assigned."""
        # Simulate the pattern from tickets/signals.py

        # Arrange
        from smoothschedule.communication.notifications.models import Notification

        mock_recipient = Mock(id=1, email='assignee@example.com')
        mock_actor = Mock(id=2, email='assigner@example.com', full_name='Manager')
        mock_ticket = Mock(id=42, subject='Fix login bug')

        # Act
        with patch.object(Notification.objects, 'create') as mock_create:
            mock_notification = Mock(id=100)
            mock_create.return_value = mock_notification

            # This simulates what a signal handler would do
            notification = Notification.objects.create(
                recipient=mock_recipient,
                actor=mock_actor,
                verb='assigned you to',
                target=mock_ticket,
                data={
                    'ticket_id': mock_ticket.id,
                    'ticket_subject': mock_ticket.subject
                }
            )

        # Assert
        mock_create.assert_called_once()
        assert notification.id == 100

    def test_create_notification_from_event_status_change(self):
        """Test creating notification when event status changes."""
        # Simulate the pattern from schedule/signals.py

        # Arrange
        from smoothschedule.communication.notifications.models import Notification

        mock_customer = Mock(id=5, email='customer@example.com')
        mock_event = Mock(id=100, title='Plumbing Service', status='en_route')

        # Act
        with patch.object(Notification.objects, 'create') as mock_create:
            # System notification (no actor)
            Notification.objects.create(
                recipient=mock_customer,
                verb='is on the way',
                target=mock_event,
                data={
                    'old_status': 'scheduled',
                    'new_status': 'en_route',
                    'event_id': mock_event.id
                }
            )

        # Assert
        mock_create.assert_called_once()
        call_kwargs = mock_create.call_args[1]
        assert call_kwargs['recipient'] == mock_customer
        assert call_kwargs['verb'] == 'is on the way'
        assert call_kwargs['target'] == mock_event
        assert call_kwargs['data']['new_status'] == 'en_route'

    def test_skip_notification_creation_when_disabled(self):
        """Test that notifications can be conditionally skipped."""
        # This tests the skip_notifications pattern

        # Arrange
        skip_notifications = True

        # Act & Assert
        if skip_notifications:
            # Notification should not be created
            assert True  # Verify the skip logic works
        else:
            # Would create notification
            pass

    def test_create_notification_with_availability_check(self):
        """Test creating notification with availability check."""
        # This tests the pattern where we check if notifications are available

        # Arrange
        from smoothschedule.communication.notifications.models import Notification

        mock_recipient = Mock()

        # Act
        notifications_available = True

        if notifications_available:
            with patch.object(Notification.objects, 'create') as mock_create:
                Notification.objects.create(
                    recipient=mock_recipient,
                    verb='test notification'
                )

                # Assert
                mock_create.assert_called_once()


class TestNotificationPermissions:
    """Test permission checks for notifications."""

    def test_user_can_only_see_own_notifications(self):
        """Test that users can only access their own notifications."""
        from smoothschedule.communication.notifications.views import NotificationViewSet

        # Arrange
        user1 = Mock(id=1)
        user2 = Mock(id=2)

        request = Mock()
        request.user = user1

        viewset = NotificationViewSet()
        viewset.request = request

        # Act
        from smoothschedule.communication.notifications.models import Notification
        with patch.object(Notification.objects, 'filter') as mock_filter:
            mock_qs = Mock()
            mock_filter.return_value = mock_qs

            queryset = viewset.get_queryset()

            # Assert
            mock_filter.assert_called_once_with(recipient=user1)

    def test_authenticated_user_required(self):
        """Test that authentication is required."""
        from smoothschedule.communication.notifications.views import NotificationViewSet
        from rest_framework.permissions import IsAuthenticated

        # Assert
        assert IsAuthenticated in NotificationViewSet.permission_classes

    def test_user_cannot_create_notifications_for_others(self):
        """Test that users cannot manually create notifications via API."""
        from smoothschedule.communication.notifications.serializers import NotificationSerializer

        # The serializer should have all notification creation fields as read-only
        serializer = NotificationSerializer()

        # Assert - these fields should be read-only
        read_only_fields = NotificationSerializer.Meta.read_only_fields
        assert 'verb' in read_only_fields
        assert 'actor_type' in read_only_fields
        assert 'target_type' in read_only_fields

    def test_user_can_mark_own_notification_as_read(self):
        """Test that users can mark their own notifications as read."""
        from smoothschedule.communication.notifications.views import NotificationViewSet
        from rest_framework.test import APIRequestFactory

        # Arrange
        factory = APIRequestFactory()
        request = factory.post('/api/notifications/1/mark_read/')

        mock_user = Mock(id=1)
        request.user = mock_user

        mock_notification = Mock(id=1, recipient=mock_user, read=False)
        mock_notification.save = Mock()

        viewset = NotificationViewSet()
        viewset.request = request

        # Act
        with patch.object(viewset, 'get_object', return_value=mock_notification):
            response = viewset.mark_read(request, pk=1)

        # Assert
        assert mock_notification.read is True
        assert response.status_code == 200


class TestNotificationWorkflow:
    """Test complete notification workflows."""

    def test_complete_ticket_assignment_workflow(self):
        """Test complete workflow from ticket assignment to notification delivery."""
        from smoothschedule.communication.notifications.models import Notification

        # Arrange
        assignee = Mock(id=1, email='john@example.com', full_name='John Doe')
        assigner = Mock(id=2, email='manager@example.com', full_name='Manager')
        ticket = Mock(id=42, subject='Urgent: Fix bug')

        # Act - Step 1: Create notification
        with patch.object(Notification.objects, 'create') as mock_create:
            mock_notification = Mock(
                id=100,
                recipient=assignee,
                actor=assigner,
                verb='assigned you to',
                target=ticket,
                read=False
            )
            mock_create.return_value = mock_notification

            notification = Notification.objects.create(
                recipient=assignee,
                actor=assigner,
                verb='assigned you to',
                target=ticket,
                data={'ticket_id': 42, 'ticket_subject': 'Urgent: Fix bug'}
            )

        # Step 2: User retrieves notifications
        with patch.object(Notification.objects, 'filter') as mock_filter:
            mock_qs = Mock()
            mock_qs.count.return_value = 1
            mock_filter.return_value = mock_qs

            unread_count = Notification.objects.filter(
                recipient=assignee,
                read=False
            ).count()

        # Step 3: User marks as read
        notification.read = True
        notification.save = Mock()
        notification.save()

        # Assert
        assert notification.recipient == assignee
        assert notification.actor == assigner
        assert unread_count == 1
        assert notification.read is True
        notification.save.assert_called_once()

    def test_event_status_change_notification_workflow(self):
        """Test workflow for event status change notifications."""
        from smoothschedule.communication.notifications.models import Notification

        # Arrange
        customer = Mock(id=5, email='customer@example.com')
        event = Mock(id=100, title='Service Appointment')

        # Act - Simulate status changes: scheduled -> en_route -> in_progress
        statuses = [
            ('scheduled', 'en_route', 'is on the way'),
            ('en_route', 'in_progress', 'has arrived'),
        ]

        created_notifications = []

        for old_status, new_status, verb in statuses:
            with patch.object(Notification.objects, 'create') as mock_create:
                mock_notif = Mock(
                    recipient=customer,
                    verb=verb,
                    target=event,
                    data={'old_status': old_status, 'new_status': new_status}
                )
                mock_create.return_value = mock_notif

                notification = Notification.objects.create(
                    recipient=customer,
                    verb=verb,
                    target=event,
                    data={'old_status': old_status, 'new_status': new_status}
                )
                created_notifications.append(notification)

        # Assert
        assert len(created_notifications) == 2
        assert created_notifications[0].verb == 'is on the way'
        assert created_notifications[1].verb == 'has arrived'

    def test_bulk_notification_creation_for_team(self):
        """Test creating notifications for multiple team members."""
        from smoothschedule.communication.notifications.models import Notification

        # Arrange
        team_members = [
            Mock(id=1, email='alice@example.com'),
            Mock(id=2, email='bob@example.com'),
            Mock(id=3, email='charlie@example.com'),
        ]
        project = Mock(id=10, title='New Project')
        creator = Mock(id=99, full_name='Project Manager')

        # Act
        with patch.object(Notification.objects, 'bulk_create') as mock_bulk:
            # Create mock notification objects instead of real instances
            notifications = [
                Mock(
                    spec=Notification,
                    recipient=member,
                    actor=creator,
                    verb='added you to project',
                    target=project
                )
                for member in team_members
            ]

            Notification.objects.bulk_create(notifications)

        # Assert
        mock_bulk.assert_called_once()
        created = mock_bulk.call_args[0][0]
        assert len(created) == 3
        assert all(notif.verb == 'added you to project' for notif in created)


class TestNotificationCleanup:
    """Test notification cleanup and maintenance operations."""

    def test_clear_read_notifications(self):
        """Test clearing read notifications."""
        from smoothschedule.communication.notifications.models import Notification

        # Arrange
        mock_user = Mock(id=1)

        # Act
        with patch.object(Notification.objects, 'filter') as mock_filter:
            mock_qs = Mock()
            mock_qs.delete.return_value = (10, {'notifications.Notification': 10})
            mock_filter.return_value = mock_qs

            deleted, _ = Notification.objects.filter(
                recipient=mock_user,
                read=True
            ).delete()

        # Assert
        assert deleted == 10
        mock_filter.assert_called_once_with(recipient=mock_user, read=True)

    def test_archive_old_notifications(self):
        """Test archiving old notifications."""
        from smoothschedule.communication.notifications.models import Notification
        from datetime import datetime, timedelta

        # Arrange
        cutoff_date = datetime.now() - timedelta(days=90)

        # Act
        with patch.object(Notification.objects, 'filter') as mock_filter:
            mock_qs = Mock()
            mock_qs.delete.return_value = (50, {'notifications.Notification': 50})
            mock_filter.return_value = mock_qs

            deleted, _ = Notification.objects.filter(
                timestamp__lt=cutoff_date
            ).delete()

        # Assert
        assert deleted == 50


class TestNotificationErrorHandling:
    """Test error handling in notification system."""

    def test_handle_missing_recipient_gracefully(self):
        """Test handling when recipient is missing."""
        # This tests defensive programming

        # Arrange
        recipient = None
        verb = 'test notification'

        # Act & Assert
        if not recipient:
            # Should skip notification creation
            assert True  # Verify the check works
        else:
            # Would create notification
            pass

    def test_handle_notification_creation_failure(self):
        """Test handling when notification creation fails."""
        from smoothschedule.communication.notifications.models import Notification

        # Arrange
        mock_recipient = Mock()

        # Act
        with patch.object(Notification.objects, 'create', side_effect=Exception('DB Error')):
            try:
                Notification.objects.create(
                    recipient=mock_recipient,
                    verb='test'
                )
                created = True
            except Exception:
                created = False

        # Assert
        assert created is False

    def test_handle_deleted_target_object(self):
        """Test notification when target object has been deleted."""
        from smoothschedule.communication.notifications.serializers import NotificationSerializer

        # Arrange
        mock_notification = Mock()
        mock_notification.target = None
        mock_notification.target_content_type = None

        serializer = NotificationSerializer()

        # Act
        target_display = serializer.get_target_display(mock_notification)
        target_url = serializer.get_target_url(mock_notification)

        # Assert
        assert target_display is None
        assert target_url is None


class TestNotificationBatching:
    """Test notification batching and bulk operations."""

    def test_batch_mark_as_read(self):
        """Test marking multiple notifications as read in batch."""
        from smoothschedule.communication.notifications.models import Notification

        # Arrange
        notification_ids = [1, 2, 3, 4, 5]

        # Act
        with patch.object(Notification.objects, 'filter') as mock_filter:
            mock_qs = Mock()
            mock_qs.update.return_value = 5
            mock_filter.return_value = mock_qs

            updated = Notification.objects.filter(
                id__in=notification_ids
            ).update(read=True)

        # Assert
        assert updated == 5

    def test_batch_delete_notifications(self):
        """Test deleting multiple notifications in batch."""
        from smoothschedule.communication.notifications.models import Notification

        # Arrange
        notification_ids = [10, 11, 12]

        # Act
        with patch.object(Notification.objects, 'filter') as mock_filter:
            mock_qs = Mock()
            mock_qs.delete.return_value = (3, {'notifications.Notification': 3})
            mock_filter.return_value = mock_qs

            deleted, _ = Notification.objects.filter(
                id__in=notification_ids
            ).delete()

        # Assert
        assert deleted == 3
