from PyQt5.QtCore import QSize, Qt
from PyQt5.QtWidgets import QApplication, QWidget, QTextBrowser, QLineEdit, QVBoxLayout, QLabel, QPushButton, QVBoxLayout, QHBoxLayout, QFileDialog, QComboBox
from PyQt5.QtGui import QPixmap
import sys, os, os.path
import os
import numpy as np
import skimage as sk
import skimage.io as io
import numpy.linalg as lin
import matplotlib.pyplot as plt
import scipy as spy


class fenetre(QWidget):

	def __init__(self, parent = None):

		super(self, changcanal).__init__(parent)

		# Création de la fenêtre Vertical
		self.vLayout = QVBoxLayout()

		#Titre de la fenêtre


		# Création du champ d'affichage
		self.label = QLabel()
		self.label.setScaledContents(True)

		# Création du bouton charger
		self.button = QPushButton('Charger')
		self.button.clicked.connect(self.charger)
		self.button.setDefault(True)

		# Bouton de taille fixe, centré
		self.button.setFixedSize(self.button.sizeHint())
		hLayout = QHBoxLayout()
		hLayout.addWidget(self.button, Qt.AlignHCenter)

		#Création du menu de changement de canal
		layout = QHBoxLayout()
		self.cb = QComboBox()
		self.cb.addItems(["Rouge", "Vert", "Bleu", "Infrarouge"])
		self.cb.currentIndexChanged.connect(self.selectionchange)

		layout.addWidget(self.cb)
		self.setLayout(layout)

	def selectionchange(self, i):
		print("Les canaux possibles sont :")

		for count in range(self.cb.count()):
			print
			self.cb.itemText(count)
		print("Canal", i, "Canal changé", self.cb.currentText())

	def main():
		app = QApplication(sys.argv)
		ex = fenetre(QWidget)
		fenetre.show()
		sys.exit(app.exec_())

	if __name__ == '__main__':
		main()

		# Création du bouton OK
		self.button1 = QPushButton('OK')
		self.button1.clicked.connect(self.OK)
		self.button1.setDefault(True)

		# Bouton de taille fixe, centré
		self.button1.setFixedSize(self.button.sizeHint())
		hLayout = QHBoxLayout()
		hLayout.addWidget(self.button, Qt.AlignHCenter)

		# Aligner la zone Verticalement
		self.vLayout.addWidget(self.label)
		# self.vLayout.addWidget (self.button)
		self.vLayout.addLayout(hLayout)

		# Creation de la zone
		self.pixmap = QPixmap()
		self.setWindowTitle('Images')
		self.setLayout(self.vLayout)

		# Memorisation du chemin courant
		self.path = None

	def charger(self):
		# Demande le nom du fichier à charger
		fileToOpen, _ = QFileDialog.getOpenFileName(None, 'Open a File', self.path, '*.png *.jpg *.gif *.bmp *.Tif *.Tiff')

		# Isole le chemin memorisé pour la prochaine fois
		self.path = os.path.dirname(fileToOpen)

		# Charge le fichier image
		self.pixmap.load(fileToOpen)

		# Calcule le Zoom pour tenir dans les limites de la fenêtre
		width = self.pixmap.size().width()
		height = self.pixmap.size().height()

		if width > 1000 or height > 600:
			factor = max(width / 1000, height / 600)
			self.label.setFixedSize(QSize(width / factor, height / factor))

		else:
			self.label.setFixedSize(QSize(width, height))

			# Affiche l'image
			self.label.setPixmap(self.pixmap)

			# Redimensionne
			self.setFixedSize(self.vLayout.sizeHint())

	# def OK(self):
	# 	if VisuLandSat.cb == "Bleu":
     #        ##-----------------Import de l'image--------------
    #
     #        img = io.imread('etm_29aout1999_ssb.tif')
    #
     #        ncan = np.size(img, 0)
     #        ny = np.size(img, 1)
     #        nx = np.size(img, 2)
     #        N = ny * nx
     #        #
     #        # --- Tableau des observations multi-spectrales ---
     #        X = np.zeros((ny, nx, ncan), float)
     #        for i in range(ncan):
     #            X[:, :, i] = img[i, :, :]
     #        #
     #        # --- Affichage du canal bleu
     #        img3cp = np.zeros((np.size(img, 1), np.size(img, 2), 3), dtype=np.uint8)
     #        img3cp[:, :, 0] = (X[:, :, 2])
     #        img3cp[:, :, 1] = (X[:, :, 1])
     #        img3cp[:, :, 2] = (X[:, :, 0])
     #        #
     #        fig = plt.figure()
     #        image = io.imshow(img3cp)
     #        fig.set_tight_layout(True)
     #        plt.savefig('etm_29aout1999_ssb_RGB.png', dpi=300)  # --- Image RGB ---
     #        plt.show(image)


app = QApplication(sys.argv)
dialogue = displayJPEG()
dialogue.show()
app.exec_()
##
#
# --- Lecture de la donnée multi-spectrale Landsat ---
#
#
##

#
#---- Fin du programme : Visu_Landsat ----
#