#!/usr/bin/python3
import sys,urllib3
from PyQt4.QtGui import *
from PyQt4.QtCore import *

def calculate(principle,rate,time):
	amount = principle * ((1 + (rate / 100.0)) ** time)
	return amount


class Form(QDialog):

	def __init__(self,parent=None):
		super(Form,self).__init__(parent)

		yList = ("1","2","3","4","5","6","7","8","9","10")

		#Creating Labels for Widgets
		PLabel = QLabel("Principal: ")
		RLabel = QLabel("Rate: ")
		YLabel = QLabel("Years: ")
		ALabel = QLabel("Amount: ")
		AoutLabel = QLabel("")

		#Initializing Widgets
		self.PSpinBox = QDoubleSpinBox().setValue(100.00)
		self.RSpinBox = QDoubleSpinBox().setValue(5.00)
		self.YComboBox = QComboBox().addItems(yList)


		#Laying out Widgets
		grid = QGridLayout()
		grid.addWidget(PLabel,0,0)
		grid.addWidget(RLabel,1,0)
		grid.addWidget(YLabel,2,0)
		grid.addWidget(ALabel,3,0)
		grid.addWidget(AoutLabel,3,1)
		grid.addWidget(self.PSpinBox,0,1)
		grid.addWidget(self.RSpinBox,1,1)
		grid.addWidget(self.YComboBox,2,1)

		#Update Widgets when value changes
		self.connect(self.PSpinBox, SIGNAL("valueChanged(double)"),self.updateUi)
		self.connect(self.RSpinBox, SIGNAL("valueChanged(double)"),self.updateUi)
		self.connect(self.YComboBox, SIGNAL("currentIndexChanged(int)"),self.updateUi)

	def updateUi(self):

		updateYCombo = unicode(self.YComboBox.currentText())
		updatePSpin = self.PSpinBox.value()
		updateRSpin = self.RSpinBox.value()
		self.AoutLabel.setText("%0.2f" % calculate(self.PSpinBox.value(),self.RSpinBox.value(), \
							self.YComboBox.currentText()))

def main():
	app = QApplication(sys.argv)
	form = Form()
	form.show()
	app.exec_()

if __name__ == "__main__":
	main()