from unittest.mock import MagicMock, patch, call
import pytest
from sientia_do.notifications.handlers import CoreNotificationHandler as NotificationHandler
from scouter.activities.faker import Faker


@pytest.fixture
def mock_kafka_producer():
    with patch('scouter.activities.faker.KafkaProducer') as mock:
        producer = MagicMock()
        mock.return_value = producer
        yield producer


@pytest.fixture
def mock_datetime():
    with patch('scouter.activities.faker.datetime') as mock_dt:
        mock_dt.now.return_value.strftime.return_value = '2025-05-14 14:54:24'
        yield mock_dt


@pytest.fixture
def faker_instance(mock_kafka_producer):
    logger = MagicMock()
    notification_handler = MagicMock(spec=NotificationHandler)
    return Faker(
        bootstrap_servers='localhost:9092',
        logger=logger,
        notification_handler=notification_handler
    )


@pytest.mark.asyncio
async def test_faker_init(faker_instance, mock_kafka_producer):
    """Test Faker initialization with correct parameters"""
    assert faker_instance.producer is not None
    assert len(faker_instance.tags) == 6

metadata = {
    'metadata': {
        'model_id': 'test_model_id',
        'model_name': 'test_model',
        'schedule_name': 'test_schedule',
        'workflow_name': 'scouter'
    }
}


@pytest.mark.asyncio
async def test_generate_and_send_data_default_count(faker_instance,
                                                    mock_kafka_producer, mock_datetime):
    """Test generating data with default message count"""
    # Mock random.choice to control the output
    with patch('random.choice') as mock_choice, \
            patch('random.uniform', return_value=42.5), \
            patch('random.randint', return_value=3), \
            patch('random.random', return_value=0.5):

        # Setup mock for tag and name selection
        mock_choice.side_effect = [
            'ns=1;i=1001',
            'ns=1;i=1002',
            'ns=1;i=1003'
        ]

        # Call the method
        await faker_instance.generate_and_send_data({'topic': 'test_topic', **metadata})

        # Verify the producer was called 3 times (default count)
        assert mock_kafka_producer.send.call_count == 3
        mock_kafka_producer.flush.assert_called_once()

        # Verify the message format
        expected_data = [{
            'tag': 'ns=1;i=1001',
            'name': 'Temperature Sensor',
            'timestamp': '2025-05-14 14:54:24',
            'value': 42.5
        }, {
            'tag': 'ns=1;i=1002',
            'name': 'Vibration Meter',
            'timestamp': '2025-05-14 14:54:24',
            'value': 42.5
        }, {
            'tag': 'ns=1;i=1003',
            'name': 'Pressure Gauge',
            'timestamp': '2025-05-14 14:54:24',
            'value': 42.5
        }]
        mock_kafka_producer.send.assert_has_calls([
            call('test_topic', value=expected_data[0]),
            call('test_topic', value=expected_data[1]),
            call('test_topic', value=expected_data[2])
        ])


@pytest.mark.asyncio
async def test_generate_and_send_data_custom_count(faker_instance, mock_kafka_producer):
    """Test generating data with custom message count"""
    # Call the method with custom count
    await faker_instance.generate_and_send_data({
        'topic': 'test_topic',
        'num_messages': 2,
        **metadata
    })

    # Verify the producer was called 2 times
    assert mock_kafka_producer.send.call_count == 2
    mock_kafka_producer.flush.assert_called_once()


@pytest.mark.asyncio
async def test_generate_and_send_data_no_topic(faker_instance):
    """Test that ValueError is raised when no topic is provided"""
    with pytest.raises(ValueError, match="Topic must be specified in input_data"):
        await faker_instance.generate_and_send_data({**metadata})


@pytest.mark.asyncio
@patch('scouter.activities.faker.random.random', return_value=0.5)
async def test_generate_and_send_data_random_values(_random, faker_instance, mock_kafka_producer):
    """Test that random values are within expected ranges"""
    # Call the method
    await faker_instance.generate_and_send_data({'topic': 'test_topic', **metadata})

    # Get the call arguments
    call_args = mock_kafka_producer.send.call_args[1]['value']

    # Verify the data structure
    assert 'tag' in call_args
    assert call_args['tag'] in faker_instance.tags
    assert 'value' in call_args
    assert 0 <= call_args['value'] <= 100


@pytest.mark.asyncio
@patch('scouter.activities.faker.random.random', return_value=0.05)
async def test_generate_and_send_data_generate_null_values(
        _random_mock,
        faker_instance,
        mock_kafka_producer):
    # Call the method
    await faker_instance.generate_and_send_data({'topic': 'test_topic',
                                                 'num_messages': 1,
                                                 **metadata})

    # Get the call arguments
    call_args = mock_kafka_producer.send.call_args[1]['value']

    assert call_args['value'] is None
    assert call_args['tag'] in faker_instance.tags
    assert 'name' in call_args
    assert 'timestamp' in call_args