#!/usr/bin/env python

"""features.py:  Feature extraction."""

# import tensorflow.contrib.slim as slim
import logging

import numpy as np
import scipy.misc
import tensorflow as tf

from ..utils import TFModel


class Features(TFModel):
    def __init__(self, config):
        TFModel.__init__(self, config)

        try:
            # (1) Find feature tensor
            feature_tensor = self.tf_graph.get_tensor_by_name(config["features-tensor"])
            # self.tf_feature_out = slim.flatten(feature_tensor)
            self.tf_feature_out = tf.keras.layers.Flatten()(feature_tensor)

            # (2) Find input tensor
            self.tf_input = self.tf_graph.get_tensor_by_name(config["input-tensor"])

            self.input_shape = self.tf_input.shape[1:]
            logging.debug("Input shape: %s" % self.input_shape)

        except:
            self._report_error("Could not access tensors by name")

    def extract_features(self, image):
        resized_image = scipy.misc.imresize(image, self.input_shape)
        features = self.tf_session.run(self.tf_feature_out,
                                       feed_dict={self.tf_input: np.expand_dims(resized_image, axis=0)})

        return features