import time
import psutil
import matplotlib.pyplot as plt
from scipy.spatial import distance as dist
from imutils.video import VideoStream
from imutils import face_utils
from threading import Thread
import numpy as np
import playsound
import argparse
import imutils
import dlib
import cv2
import time
import random
import psutil


plt.rcParams['animation.html'] = 'jshtml'
fig = plt.figure()
ax = fig.add_subplot(111)
fig.show()
i = 0
x, y = [], []

def eye_aspect_ratio(eye):
	# compute the euclidean distances between the two sets of
	# vertical eye landmarks (x, y)-coordinates
	A = dist.euclidean(eye[1], eye[5])
	B = dist.euclidean(eye[2], eye[4])

	# compute the euclidean distance between the horizontal
	# eye landmark (x, y)-coordinates
	C = dist.euclidean(eye[0], eye[3])

	# compute the eye aspect ratio
	ear = (A + B) / (2.0 * C)

	# return the eye aspect ratio
	return ear


EYE_AR_THRESH = 0.2
EYE_AR_CONSEC_FRAMES = 48

COUNTER = 0
ITER    = 0
ALARM_ON = False
PREDICTOR_PATH = "68_face_landmarks.dat"
detector = dlib.get_frontal_face_detector()
predictor = dlib.shape_predictor(PREDICTOR_PATH)
(lStart, lEnd) = face_utils.FACIAL_LANDMARKS_IDXS["left_eye"]
(rStart, rEnd) = face_utils.FACIAL_LANDMARKS_IDXS["right_eye"]

capture = cv2.VideoCapture(0)

while True:
    has_frame, frame = capture.read()
    if not has_frame:
        print('Can\'t get frame')
        break
    frame = imutils.resize(frame, width=300, height=200)
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    rects = detector(gray, 0)
    for rect in rects:
        shape = predictor(gray, rect)
        shape = face_utils.shape_to_np(shape)
        leftEye = shape[lStart:lEnd]
        rightEye = shape[rStart:rEnd]
        leftEAR = eye_aspect_ratio(leftEye)
        rightEAR = eye_aspect_ratio(rightEye)
        
        ear = (leftEAR + rightEAR) / 2.0
    
        leftEyeHull = cv2.convexHull(leftEye)
        rightEyeHull = cv2.convexHull(rightEye)
        cv2.drawContours(frame, [leftEyeHull], -1, (0, 255, 0), 1)
        cv2.drawContours(frame, [rightEyeHull], -1, (0, 255, 0), 1)
        

        x.append(i)
        y.append(ear)
    
        ax.plot(x, y, color='b')
    
        fig.canvas.draw()
    
        ax.set_xlim(left=max(0, i-50), right=i+50)
    
        i += 1

        if ear > EYE_AR_THRESH:
            ITER += 1
 
        else:
            ITER = 0
            ALARM_ON = False

        if ITER == 2 :
            COUNTER += 1
        cv2.putText(frame, "COUNTER: {:d}".format(COUNTER), (10, 30),
            cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)    
        cv2.putText(frame, "EAR: {:.2f}".format(ear).format(COUNTER), (10, 60),
            cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)    
    
    cv2.imshow('frame', frame)
    key = cv2.waitKey(3)
    if key == 27:
        print('Pressed Esc')
        break
    key = key & 0xFF
    if key == ord("q"):
        print('Pressed Esc')
        break
        
capture.release()
cv2.destroyAllWindows()