# import the necessary packages
from __future__ import print_function
from PIL import Image
from PIL import ImageTk
import Tkinter as tki
import threading
import datetime
import imutils
import cv2
import os

class PhotoBoothApp:
	def __init__(self, vs, outputPath):
		# store the video stream object and output path, then initialize
		# the most recently read frame, thread for reading frames, and
		# the thread stop event
		self.vs = vs
		self.outputPath = outputPath
		self.frame = None
		self.thread = None
		self.stopEvent = None
		# initialize the root window and image panel
		self.root = tki.Tk()
		self.panel = None


    # create a button, that when pressed, will take the current
    # frame and save it to file
    btn = tki.Button(self.root, text="Snapshot!",
                     command=self.takeSnapshot)
    btn.pack(side="bottom", fill="both", expand="yes", padx=10,
             pady=10)
    # start a thread that constantly pools the video sensor for
    # the most recently read frame
    self.stopEvent = threading.Event()
    self.thread = threading.Thread(target=self.videoLoop, args=())
    self.thread.start()
    # set a callback to handle when the window is closed
    self.root.wm_title("PyImageSearch PhotoBooth")
    self.root.wm_protocol("WM_DELETE_WINDOW", self.onClose)


def videoLoop(self):
    # DISCLAIMER:
    # I'm not a GUI developer, nor do I even pretend to be. This
    # try/except statement is a pretty ugly hack to get around
    # a RunTime error that Tkinter throws due to threading
    try:
        # keep looping over frames until we are instructed to stop
        while not self.stopEvent.is_set():
            # grab the frame from the video stream and resize it to
            # have a maximum width of 300 pixels
            self.frame = self.vs.read()
            self.frame = imutils.resize(self.frame, width=300)

            # OpenCV represents images in BGR order; however PIL
            # represents images in RGB order, so we need to swap
            # the channels, then convert to PIL and ImageTk format
            image = cv2.cvtColor(self.frame, cv2.COLOR_BGR2RGB)
            image = Image.fromarray(image)
            image = ImageTk.PhotoImage(image)

            # if the panel is not None, we need to initialize it
            if self.panel is None:
                self.panel = tki.Label(image=image)
                self.panel.image = image
                self.panel.pack(side="left", padx=10, pady=10)

            # otherwise, simply update the panel
            else:
                self.panel.configure(image=image)
                self.panel.image = image
    except RuntimeError, e:
        print("[INFO] caught a RuntimeError")


def takeSnapshot(self):
    # grab the current timestamp and use it to construct the
    # output path
    ts = datetime.datetime.now()
    filename = "{}.jpg".format(ts.strftime("%Y-%m-%d_%H-%M-%S"))
    p = os.path.sep.join((self.outputPath, filename))
    # save the file
    cv2.imwrite(p, self.frame.copy())
    print("[INFO] saved {}".format(filename))


ef onClose(self):
		# set the stop event, cleanup the camera, and allow the rest of
		# the quit process to continue
		print("[INFO] closing...")
		self.stopEvent.set()
		self.vs.stop()
		self.root.quit()