import cv2
import os.path
import os
from PIL import Image

###############
# def get_frames(input1)
# ex. get_frames(video.mov)
#
# Task: Extracting frames from a video
#
# Inputs: 
#   - input1: a video
#
# Output:
#   -RGB_avg: a directory with all the frames of the video
#
# author: Loic Delattre and Maryne Dey (loic.delattre@ecam.fr, maryne.dey@ecam.fr)
# date: 06/02/2023
###############


video = 'my_face.mov'


def get_frames(vid):
    path_to_script = os.path.dirname(os.path.abspath(__file__))
    if os.path.exists(path_to_script + r"\frames") == False:
        os.mkdir(path_to_script + r"\frames")

    # Opens the Video file
    cap= cv2.VideoCapture(vid)

    i=0
    while cap.isOpened():
        ret, img = cap.read()
        if ret == False:
            break
            
        face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
        eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')

        gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
        faces = face_cascade.detectMultiScale(gray, 1.3, 5) #detect the face in the frame

        for (x,y,w,h) in faces:
            # To draw a rectangle in a face for testing purposes
            cv2.rectangle(img,(x,y),(x+w,y+h),(255,255,0),2) 
            roi_gray = gray[y:y+h, x:x+w]
            roi_color = img[y:y+h, x:x+w]

        eyes = eye_cascade.detectMultiScale(roi_gray) #detect the eyes in the frames taking the face as reference
        list_ex = []
        list_ey = []
        list_ew = []
        list_eh = []
  
        #To draw a rectangle in eyes
        for (ex,ey,ew,eh) in eyes:
            if ew >= 82 and eh >= 82:
                #cv2.rectangle(roi_color,(ex,ey),(ex+ew,ey+eh),(0,127,255),2)
                list_ex.append(ex)
                list_ey.append(ey)
                list_ew.append(ew)
                list_eh.append(eh)
    
        #rectangle on forhead
        try:
            fx = min(list_ex) + list_ew[list_ex.index(min(list_ex))] #deducing ROI from the eyes rectangle coordinates
            fy = max(list_ey)
            x1 = x + fx
            x2 = x + fx + 100 #extra values in x and y in the parameters are adjustements made after manual testing
            y1 = y + fy - 150
            y2 = y + fy - 20

            imRGB = img[y1:y2, x1:x2]

            cv2.imwrite('frames/frame'+str(i)+'.jpg',imRGB)
            i+=1
        except:
            print('error on min value of ex')
        #cv2.rectangle(roi_color, (fx,fy-150),(fx+100,fy-20),(0,127,255),2) #for testing purposes
        #cv2.imshow('img',roi_color)
        #cv2.waitKey(0)

    cap.release()
    cv2.destroyAllWindows()
    return i
print('number of frames extracted ' + get_frames(video))