# This class makes the training of the model possible

import argparse
import glob
import logging
import random
import cv2
import cv2.face
import numpy as np
import sys

from email_service import sendMail

logfile = 'logs/process_model.log'

# Creates and configures the logger
logging.basicConfig(level=logging.NOTSET, format='%(asctime)s %(levelname)-8s %(message)s',
                    datefmt='%m-%d %H:%M',
                    filename=logfile)

# Argument parser allows to specify program parameters
parser = argparse.ArgumentParser(description='Process Model Application')
parser.add_argument('-0', action='append_const', dest='emotions', const='neutral', help='neutral')
parser.add_argument('-1', action='append_const', dest='emotions', const='happy', help='happy')
parser.add_argument('-2', action='append_const', dest='emotions', const='sadness', help='sadness')
parser.add_argument('-3', action='append_const', dest='emotions', const='surprise', help='surprise')
parser.add_argument('-4', action='append_const', dest='emotions', const='fear', help='fear')
parser.add_argument('-5', action='append_const', dest='emotions', const='disgust', help='disgust')
parser.add_argument('-6', action='append_const', dest='emotions', const='anger', help='anger')
parser.add_argument('-d', '--dataset', action='store', dest='dataset', default='resources/img_data/dataset/',
                    help='path to dataset')
parser.add_argument('-i' '--iterations', action='store', dest='iterations', type=int, default=30,
                    help='number of iterations')
parser.add_argument('-p', '--properties', nargs='+', dest='properties', help='pre-processing steps for logging')
parser.add_argument('-t', '--test', action='store_true', dest='test', help='prevent writing new model to classifier')
parser.add_argument('-c', '--csv', action='store_true', dest='csv', help='activate csv output')
parser.add_argument('-x', '--email', action='store_true', dest='email', help='activate email notifications')
arguments = parser.parse_args()
logging.debug(arguments)

if not arguments.emotions:
    print('No emotions declared')
    sys.exit()

logging.info('Fisherface training started')

if arguments.email:
    sendMail('Fisherface training started')

def _get_faces_from_emotion(emotion):
    """
    Get all the files to an emotion from the dataset, mix them, and split them into a training and test set.
     : param emotion: The emotion
     : return: training, prediction
    """
    files = glob.glob(arguments.dataset + '{}/*'.format(emotion))
    random.shuffle(files)

    # Mix the dataset in training and comparison images in the ratio 80 to 20
    training = files[:int(len(files) * 0.8)]
    prediction = files[-int(len(files) * 0.2):]

    return training, prediction


def image_preprocessing(image):
    """
    Preprocessing of the files
     : param item: picture
    """
    img = cv2.imread(image)  # open image
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)  # convert to grayscale
    clahe = cv2.createCLAHE(2.0, (8, 8))
    norm = clahe.apply(gray)
    return norm


def make_sets():
    """
    Creates the training set
    :return: The created training data
    """
    training_data = []
    training_labels = []
    prediction_data = []
    prediction_labels = []
    for emotion in arguments.emotions:
        training, prediction = _get_faces_from_emotion(emotion)
        # Append data to training and prediction list, and generate labels 0-7
        for item in training:
            img = image_preprocessing(item)
            # append image array to training data list
            training_data.append(img)
            training_labels.append(arguments.emotions.index(emotion))

        # repeat above process for prediction set
        for item in prediction:
            img = image_preprocessing(item)
            prediction_data.append(img)
            prediction_labels.append(arguments.emotions.index(emotion))

    return training_data, training_labels, prediction_data, prediction_labels


def run_recognizer():
    """
    Performs the actual training with Fisherfaces and Logged the results
    :return: The correctly recognized faces in percent
    """
    training_data, training_labels, prediction_data, prediction_labels = make_sets()

    logging.debug('Training...')
    fishface.train(training_data, np.asarray(training_labels))

    cnt = 0
    correct = 0
    incorrect = 0
    logging.debug('Prediction...')
    for image in prediction_data:
        pred, conf = fishface.predict(image)
        if pred == prediction_labels[cnt]:
            correct += 1
            cnt += 1
        else:
            incorrect += 1
            cnt += 1
    return (100 * correct) / (correct + incorrect)


# Emotions list
fishface = cv2.face.FisherFaceRecognizer_create()
metascore = []

# Argument parser
for i in range(1, arguments.iterations + 1):
    correct = run_recognizer()
    logging.info("{} : {}%".format(i, int(correct)))
    metascore.append(correct)

    if arguments.email and i % (int(arguments.iterations / 4)) == 0:
        sendMail(str(i) + ' iterations done', body='up-to-date average: {}%'.format(np.mean(metascore)))

# Argument parser
if arguments.csv:
    file = open("resources/csv/{}.csv".format('_'.join(arguments.properties).lower()), "w")
    for entry in metascore:
        file.write("{}\n".format(int(entry)))

    file.close()

logging.info("Fisherface training finished - {}% average\n".format(np.mean(metascore)))

# Argument parser
if not arguments.test:
    fishface.write('resources/models/detection_model.xml')
    logging.info('saved trained classifier')

# Argument parser
if arguments.email:
    sendMail('Fisherface training finished', filepath='resources/models/detection_model.xml')