"""
Creates an interpreter object and returns it
"""
from typing import Callable
from . import InterpretableModel, Interpreter


class InterpretationType:
    GuidedBackprop = 'GuidedBackprop'
    GuidedGradCam = 'GuidedGradCam'
    GradCam = 'GradCam'
    RelCam = 'RelCam'
    DeepLift = 'DeepLift'
    Attention = 'Attention'
    AttentionSmooth = 'AttentionSmooth'
    AttentionSum = 'AttentionSum'
    ImagenetAttention = 'ImagenetAttention'
    GT = 'GT'


InterpreterMaker = Callable[[InterpretableModel], Interpreter]


def create_interpreter(interpretation_method: str, model: InterpretableModel) -> Interpreter:
    """
    Creates an interpreter object and returns it
    :param interpretation_method: The method name
    :param model: The model to be interpreted
    :return: an interpreter object that can run the model and interpret its output
    """

    if interpretation_method == InterpretationType.GuidedBackprop:
        from .guided_backprop import GuidedBackprop as interpreter_maker

    elif interpretation_method == InterpretationType.GuidedGradCam:
        from .guided_gradcam import GuidedGradCam as interpreter_maker

    elif interpretation_method == InterpretationType.GradCam:
        from .gradcam import GradCam as interpreter_maker

    elif interpretation_method == InterpretationType.RelCam:
        from .relcam import RelCamInterpreter as interpreter_maker

    elif interpretation_method == InterpretationType.DeepLift:
        from .deep_lift import DeepLift as interpreter_maker

    elif interpretation_method == InterpretationType.Attention:
        from .attention_interpreter import AttentionInterpreter as interpreter_maker

    elif interpretation_method == InterpretationType.AttentionSmooth:
        from .attention_interpreter_smooth_integrator import AttentionInterpreterSmoothIntegrator as interpreter_maker

    elif interpretation_method == InterpretationType.AttentionSum:
        from .attention_sum_interpreter import AttentionSumInterpreter as interpreter_maker

    elif interpretation_method == InterpretationType.ImagenetAttention:
        from .imagenet_attention_interpreter import ImagenetPredictionInterpreter as interpreter_maker

    else:
        raise Exception('Unknown interpretation method ', interpretation_method)

    return interpreter_maker(model)