# -*- coding: utf-8 -*-
from tkinter import filedialog,Tk
from PIL import Image

def fichier(action):
    popup=Tk()
    if action=="ouvrir":
        chemin_fichier =  filedialog.askopenfilename(initialdir = "./",title = "Choisissez votre fichier")
    elif action=="enregistrer":
        chemin_fichier =  filedialog.asksaveasfilename(initialdir = "./",title = "Nom du fichier à enregistrer")
    else:
        chemin_fichier=False
    popup.destroy()
    return chemin_fichier


def assemblage(pixel1,pixel2):
    sortie=[]
    for i in range(3):
        sortie.append(((pixel1[i]>>4)<<4)+(pixel2[i]>>4))
    return tuple(sortie)

def dessemblage(pixel):
    sortie=[]
    for i in range(3):
        sortie.append((pixel[i]<<4)%256)
    return tuple(sortie)

def stegano():
    image_source=Image.open(fichier("ouvrir"))
    image_cachee=Image.open(fichier("ouvrir"))
    resultat=Image.new("RGB",(min(image_source.size[0],image_cachee.size[0]),min(image_source.size[1],image_cachee.size[1])))
    for i in range(min(image_source.size[0],image_cachee.size[0])):
        for j in range(min(image_source.size[1],image_cachee.size[1])):
            pixel_source=image_source.getpixel((i,j))
            pixel_cache=image_cachee.getpixel((i,j))
            resultat.putpixel((i,j),assemblage(pixel_source,pixel_cache))
    resultat.show()
    resultat.save(fichier("enregistrer"))

def destegano():
    image=Image.open(fichier("ouvrir"))
    for i in range(image.size[0]):
        for j in range(image.size[1]):
            pixel_source=dessemblage(image.getpixel((i,j)))

            image.putpixel((i,j),pixel_source)
    image.show()