from io import BytesIO
from unittest.mock import MagicMock, patch

from pytest import fixture, mark, raises

from model_manager.activities.minio import MinIO


@patch('model_manager.activities.minio.boto3.client')
def test___init__(mock_boto3_client):
    """Test MinIO initialization with correct configuration."""
    mock_client = MagicMock()
    mock_boto3_client.return_value = mock_client

    logger = MagicMock()
    notification_handler = MagicMock()

    minio = MinIO(
        endpoint_url='http://localhost:9000',
        access_key='minioadmin',
        secret_key='minioadmin',
        region='us-east-1',
        use_ssl=False,
        max_retry_attempts=3,
        retry_mode='adaptive',
        connect_timeout=10,
        read_timeout=60,
        logger=logger,
        notification_handler=notification_handler,
    )

    assert minio.endpoint_url == 'http://localhost:9000'
    assert minio.access_key == 'minioadmin'
    assert minio.secret_key == 'minioadmin'
    assert minio.region == 'us-east-1'
    assert minio.use_ssl is False
    assert minio.max_retry_attempts == 3
    assert minio.retry_mode == 'adaptive'
    assert minio.connect_timeout == 10
    assert minio.read_timeout == 60

    # Verify boto3 client was created with correct parameters
    mock_boto3_client.assert_called_once()
    call_kwargs = mock_boto3_client.call_args[1]
    assert call_kwargs['endpoint_url'] == 'http://localhost:9000'
    assert call_kwargs['aws_access_key_id'] == 'minioadmin'
    assert call_kwargs['aws_secret_access_key'] == 'minioadmin'
    assert call_kwargs['use_ssl'] is False


@patch('model_manager.activities.minio.boto3.client')
def test___init___failure(mock_boto3_client):
    """Test MinIO initialization failure handling."""
    mock_boto3_client.side_effect = Exception('Connection failed')

    logger = MagicMock()
    notification_handler = MagicMock()

    with raises(ConnectionError, match='Failed to initialize MinIO client'):
        MinIO(
            endpoint_url='http://localhost:9000',
            access_key='minioadmin',
            secret_key='minioadmin',
            region='us-east-1',
            use_ssl=False,
            max_retry_attempts=3,
            retry_mode='adaptive',
            connect_timeout=10,
            read_timeout=60,
            logger=logger,
            notification_handler=notification_handler,
        )


@fixture
@patch('model_manager.activities.minio.boto3.client')
def minio(mock_boto3_client):
    """Fixture to create a MinIO instance for testing."""
    mock_client = MagicMock()
    mock_boto3_client.return_value = mock_client

    logger = MagicMock()
    notification_handler = MagicMock()

    minio_instance = MinIO(
        endpoint_url='http://localhost:9000',
        access_key='minioadmin',
        secret_key='minioadmin',
        region='us-east-1',
        use_ssl=False,
        max_retry_attempts=3,
        retry_mode='adaptive',
        connect_timeout=10,
        read_timeout=60,
        logger=logger,
        notification_handler=notification_handler,
    )

    minio_instance.send_notification = MagicMock()
    minio_instance.minio_client = mock_client

    return minio_instance


metadata = {
    'metadata': {
        'workflow_name': 'test_workflow',
        'model_name': 'test_model',
        'model_id': 'test_model_id',
    }
}


@mark.asyncio
async def test_fetch_file_from_minio_success(minio):
    """Test successful file fetch from MinIO."""
    # Arrange
    test_content = b'test file content'
    mock_response = {'Body': MagicMock()}
    mock_response['Body'].__enter__ = MagicMock(
        return_value=MagicMock(read=MagicMock(return_value=test_content))
    )
    mock_response['Body'].__exit__ = MagicMock(return_value=None)

    minio.minio_client.get_object.return_value = mock_response

    input_data = {
        'metadata': metadata['metadata'],
        'bucket_name': 'test-bucket',
        'file_name': 'test-file.txt',
    }

    # Act
    result = await minio.fetch_file_from_minio(input_data)

    # Assert
    assert isinstance(result, BytesIO)
    result.seek(0)
    assert result.read() == test_content

    minio.minio_client.get_object.assert_called_once_with(Bucket='test-bucket', Key='test-file.txt')


@mark.asyncio
async def test_fetch_file_from_minio_file_not_found(minio):
    """Test file fetch when file doesn't exist."""
    # Arrange
    minio.minio_client.get_object.side_effect = Exception(
        'NoSuchKey: The specified key does not exist'
    )

    input_data = {
        'metadata': metadata['metadata'],
        'bucket_name': 'test-bucket',
        'file_name': 'nonexistent.txt',
    }

    # Act & Assert
    with raises(OSError, match='Error fetching file from MinIO'):
        await minio.fetch_file_from_minio(input_data)

    # Verify notification was sent
    minio.send_notification.assert_called_once()
    call_kwargs = minio.send_notification.call_args[1]
    assert call_kwargs['notification_id'] == 'FETCH_FILE_FROM_MINIO_ERROR'
    assert call_kwargs['block'] == 'fetch_file_from_minio'


@mark.asyncio
async def test_fetch_file_from_minio_network_error(minio):
    """Test file fetch with network error."""
    # Arrange
    minio.minio_client.get_object.side_effect = Exception('Network timeout')

    input_data = {
        'metadata': metadata['metadata'],
        'bucket_name': 'test-bucket',
        'file_name': 'test-file.txt',
    }

    # Act & Assert
    with raises(OSError, match='Error fetching file from MinIO'):
        await minio.fetch_file_from_minio(input_data)

    minio.send_notification.assert_called_once()


@mark.asyncio
async def test_delete_file_from_minio_success(minio):
    """Test successful file deletion from MinIO."""
    # Arrange
    minio.minio_client.delete_object.return_value = None

    input_data = {
        'metadata': metadata['metadata'],
        'bucket_name': 'test-bucket',
        'file_name': 'test-file.txt',
    }

    # Act
    result = await minio.delete_file_from_minio(input_data)

    # Assert
    assert result is None

    minio.minio_client.delete_object.assert_called_once_with(
        Bucket='test-bucket', Key='test-file.txt'
    )


@mark.asyncio
async def test_delete_file_from_minio_idempotent(minio):
    """Test that delete is idempotent (no error if file doesn't exist)."""
    # Arrange
    # MinIO delete_object is idempotent - no error if file doesn't exist
    minio.minio_client.delete_object.return_value = None

    input_data = {
        'metadata': metadata['metadata'],
        'bucket_name': 'test-bucket',
        'file_name': 'nonexistent.txt',
    }

    # Act
    result = await minio.delete_file_from_minio(input_data)

    # Assert
    assert result is None
    minio.minio_client.delete_object.assert_called_once()


@mark.asyncio
async def test_delete_file_from_minio_access_denied(minio):
    """Test file deletion with access denied error."""
    # Arrange
    minio.minio_client.delete_object.side_effect = Exception('AccessDenied: Access Denied')

    input_data = {
        'metadata': metadata['metadata'],
        'bucket_name': 'test-bucket',
        'file_name': 'test-file.txt',
    }

    # Act & Assert
    with raises(OSError, match='Error deleting file from MinIO'):
        await minio.delete_file_from_minio(input_data)

    # Verify notification was sent
    minio.send_notification.assert_called_once()
    call_kwargs = minio.send_notification.call_args[1]
    assert call_kwargs['notification_id'] == 'DELETE_FILE_FROM_MINIO_ERROR'
    assert call_kwargs['block'] == 'delete_file_from_minio'


@mark.asyncio
async def test_delete_file_from_minio_network_error(minio):
    """Test file deletion with network error."""
    # Arrange
    minio.minio_client.delete_object.side_effect = Exception('Connection timeout')

    input_data = {
        'metadata': metadata['metadata'],
        'bucket_name': 'test-bucket',
        'file_name': 'test-file.txt',
    }

    # Act & Assert
    with raises(OSError, match='Error deleting file from MinIO'):
        await minio.delete_file_from_minio(input_data)

    minio.send_notification.assert_called_once()


@mark.asyncio
async def test_fetch_file_from_minio_large_file(minio):
    """Test fetching a large file from MinIO."""
    # Arrange
    # Simulate a 10MB file
    large_content = b'x' * (10 * 1024 * 1024)
    mock_response = {'Body': MagicMock()}
    mock_response['Body'].__enter__ = MagicMock(
        return_value=MagicMock(read=MagicMock(return_value=large_content))
    )
    mock_response['Body'].__exit__ = MagicMock(return_value=None)

    minio.minio_client.get_object.return_value = mock_response

    input_data = {
        'metadata': metadata['metadata'],
        'bucket_name': 'test-bucket',
        'file_name': 'large-file.bin',
    }

    # Act
    result = await minio.fetch_file_from_minio(input_data)

    # Assert
    assert isinstance(result, BytesIO)
    result.seek(0)
    assert len(result.read()) == 10 * 1024 * 1024


@mark.asyncio
async def test_fetch_file_from_minio_empty_file(minio):
    """Test fetching an empty file from MinIO."""
    # Arrange
    empty_content = b''
    mock_response = {'Body': MagicMock()}
    mock_response['Body'].__enter__ = MagicMock(
        return_value=MagicMock(read=MagicMock(return_value=empty_content))
    )
    mock_response['Body'].__exit__ = MagicMock(return_value=None)

    minio.minio_client.get_object.return_value = mock_response

    input_data = {
        'metadata': metadata['metadata'],
        'bucket_name': 'test-bucket',
        'file_name': 'empty-file.txt',
    }

    # Act
    result = await minio.fetch_file_from_minio(input_data)

    # Assert
    assert isinstance(result, BytesIO)
    result.seek(0)
    assert result.read() == b''