"""
Unit tests for notification helper functions and utilities.
"""
from unittest.mock import Mock, patch, MagicMock
import pytest


class TestNotificationCreationHelper:
    """Unit tests for notification creation helper (used in signals)."""

    def test_create_notification_helper_basic(self):
        """Test basic notification creation through helper."""
        # This tests the pattern used in signals.py
        from smoothschedule.communication.notifications.models import Notification

        # Arrange
        mock_recipient = Mock()
        mock_recipient.id = 1
        mock_actor = Mock()
        mock_actor.id = 2
        mock_target = Mock()
        mock_target.id = 3

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

            notification = Notification.objects.create(
                recipient=mock_recipient,
                actor=mock_actor,
                verb='assigned you to',
                target=mock_target,
                data={'extra': 'info'}
            )

        # Assert
        mock_create.assert_called_once_with(
            recipient=mock_recipient,
            actor=mock_actor,
            verb='assigned you to',
            target=mock_target,
            data={'extra': 'info'}
        )
        assert notification.id == 100

    def test_create_notification_without_actor(self):
        """Test creating system notification without actor."""
        from smoothschedule.communication.notifications.models import Notification

        # Arrange
        mock_recipient = Mock()

        # Act
        with patch.object(Notification.objects, 'create') as mock_create:
            mock_create.return_value = Mock(id=101, actor=None)

            notification = Notification.objects.create(
                recipient=mock_recipient,
                verb='your appointment is starting soon',
                data={'appointment_id': 42}
            )

        # Assert
        mock_create.assert_called_once_with(
            recipient=mock_recipient,
            verb='your appointment is starting soon',
            data={'appointment_id': 42}
        )
        assert notification.id == 101
        assert notification.actor is None

    def test_create_notification_with_action_object(self):
        """Test creating notification with action object (e.g., comment)."""
        from smoothschedule.communication.notifications.models import Notification

        # Arrange
        mock_recipient = Mock()
        mock_actor = Mock()
        mock_comment = Mock()  # The action object
        mock_ticket = Mock()   # The target

        # Act
        with patch.object(Notification.objects, 'create') as mock_create:
            Notification.objects.create(
                recipient=mock_recipient,
                actor=mock_actor,
                verb='commented on',
                action_object=mock_comment,
                target=mock_ticket
            )

        # Assert
        mock_create.assert_called_once()
        call_kwargs = mock_create.call_args[1]
        assert call_kwargs['recipient'] == mock_recipient
        assert call_kwargs['actor'] == mock_actor
        assert call_kwargs['verb'] == 'commented on'
        assert call_kwargs['action_object'] == mock_comment
        assert call_kwargs['target'] == mock_ticket

    def test_bulk_create_notifications(self):
        """Test creating multiple notifications at once."""
        from smoothschedule.communication.notifications.models import Notification

        # Arrange
        recipients = [Mock(id=i) for i in range(1, 4)]
        mock_actor = Mock()

        # Act
        with patch.object(Notification.objects, 'bulk_create') as mock_bulk:
            # Create mock notification objects instead of real instances
            notifications = [
                Mock(
                    spec=Notification,
                    recipient=recipient,
                    actor=mock_actor,
                    verb='invited you to event'
                )
                for recipient in recipients
            ]
            Notification.objects.bulk_create(notifications)

        # Assert
        mock_bulk.assert_called_once()
        created_notifications = mock_bulk.call_args[0][0]
        assert len(created_notifications) == 3


class TestNotificationAvailabilityCheck:
    """Test the notification availability checking pattern from signals."""

    def test_notifications_available_when_installed(self):
        """Test checking if notifications app is available."""
        # This tests the pattern from tickets/signals.py

        # Arrange & Act
        with patch('smoothschedule.communication.notifications.models.Notification') as MockNotification:
            mock_objects = Mock()
            mock_objects.exists.return_value = True
            MockNotification.objects = mock_objects

            # Simulate the check
            try:
                from smoothschedule.communication.notifications.models import Notification
                Notification.objects.exists()
                available = True
            except Exception:
                available = False

        # Assert
        assert available is True

    def test_notifications_unavailable_on_import_error(self):
        """Test handling when notifications app is not available."""

        # Act
        with patch('builtins.__import__', side_effect=ImportError('Module not found')):
            try:
                from smoothschedule.communication.notifications.models import Notification
                available = True
            except ImportError:
                available = False

        # Assert
        assert available is False


class TestNotificationDataStructures:
    """Test common notification data patterns."""

    def test_event_status_notification_data(self):
        """Test data structure for event status change notifications."""
        # Arrange
        data = {
            'old_status': 'scheduled',
            'new_status': 'en_route',
            'event_id': 42,
            'changed_by': 'John Doe'
        }

        # Assert
        assert 'old_status' in data
        assert 'new_status' in data
        assert 'event_id' in data
        assert data['old_status'] == 'scheduled'
        assert data['new_status'] == 'en_route'

    def test_ticket_assignment_notification_data(self):
        """Test data structure for ticket assignment notifications."""
        # Arrange
        data = {
            'ticket_id': 123,
            'ticket_subject': 'Fix login bug',
            'assigned_by': 'Manager',
            'priority': 'high'
        }

        # Assert
        assert 'ticket_id' in data
        assert 'ticket_subject' in data
        assert data['priority'] == 'high'

    def test_comment_notification_data(self):
        """Test data structure for comment notifications."""
        # Arrange
        data = {
            'comment_id': 456,
            'comment_preview': 'This looks good...',
            'parent_type': 'ticket',
            'parent_id': 789
        }

        # Assert
        assert 'comment_id' in data
        assert 'parent_type' in data
        assert len(data['comment_preview']) > 0


class TestNotificationQueryPatterns:
    """Test common notification query patterns."""

    def test_filter_unread_notifications(self):
        """Test filtering for unread 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_filter.return_value = mock_qs

            result = Notification.objects.filter(recipient=mock_user, read=False)

        # Assert
        mock_filter.assert_called_once_with(recipient=mock_user, read=False)

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

        # Arrange
        mock_ids = [1, 2, 3]

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

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

        # Assert
        assert updated == 3
        mock_qs.update.assert_called_once_with(read=True)

    def test_get_recent_notifications_limited(self):
        """Test getting recent notifications with limit."""
        from smoothschedule.communication.notifications.models import Notification

        # Arrange
        mock_user = Mock(id=1)
        limit = 20

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

            result = Notification.objects.filter(
                recipient=mock_user
            )[:limit]

        # Assert
        mock_filter.assert_called_once_with(recipient=mock_user)

    def test_delete_old_read_notifications(self):
        """Test deleting old read notifications."""
        from smoothschedule.communication.notifications.models import Notification
        from datetime import datetime, timedelta

        # Arrange
        cutoff_date = datetime.now() - timedelta(days=30)

        # 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(
                read=True,
                timestamp__lt=cutoff_date
            ).delete()

        # Assert
        assert deleted == 10
        mock_qs.delete.assert_called_once()


class TestNotificationGrouping:
    """Test notification grouping and aggregation patterns."""

    def test_count_notifications_by_type(self):
        """Test counting notifications grouped by target type."""
        from django.db.models import Count

        # This would test aggregation queries
        # For unit tests, we just verify the pattern

        # Arrange
        expected_pattern = {
            'ticket': 5,
            'event': 3,
            'appointment': 2
        }

        # Assert
        assert 'ticket' in expected_pattern
        assert expected_pattern['ticket'] == 5

    def test_group_notifications_by_date(self):
        """Test grouping notifications by date."""
        from datetime import date

        # Arrange
        notifications_by_date = {
            date(2024, 1, 15): 10,
            date(2024, 1, 16): 5,
            date(2024, 1, 17): 8
        }

        # Assert
        assert len(notifications_by_date) == 3
        assert notifications_by_date[date(2024, 1, 15)] == 10
