# -*- coding: utf-8 -*-
# Calculate commute costs

from Tkinter import *
from decimal import *

def calculateCommuteCost():
  distance = Decimal(gui.distanceToWorkBox.get())
  mpg = Decimal(gui.milesPerGallonBox.get())
  ppg = Decimal(gui.pricePerGallonBox.get())
  
  costpertrip = (distance / mpg) * ppg
  
  
  #cost per month: assuming you work 5 days per week
  #have two weeks vacation
  #and make one trip back and forth each of those day
  costpermonth = costpertrip * ((Decimal("365.25")-14)*5/7/12*2)
  costpermonth = round(costpermonth,2)
  costpertrip = round(costpertrip,2)
  gui.commuteCost.set("Commute Cost Per Trip: $%0.2f" % costpertrip)
  gui.commuteCostPerMonth.set("Average Commute Cost Per Month: $%0.2f" % costpermonth)

class GUI:
  def __init__(self, master):
    #frame = Frame(master)
    #frame.pack()
    #self.button = Button(frame, text="Test", command=self.test)
    #self.button.pack()
    
    self.commuteCost = StringVar()
    self.commuteCost.set("Commute Cost Per Trip: $0.00")
    
    self.commuteCostPerMonth = StringVar()
    self.commuteCostPerMonth.set("Average Commute Cost Per Month: $000.00")
    
    
    self.distanceToWorkLabel = Label(master, text="Miles to Work").pack()
    self.distanceToWorkBox = Entry(master)
    self.distanceToWorkBox.insert(END, "30")
    self.distanceToWorkBox.pack()
    
    self.milesPerGallonLabel = Label(master, text="Miles Per Gallon").pack()
    self.milesPerGallonBox = Entry(master)
    self.milesPerGallonBox.insert(END, "20")
    self.milesPerGallonBox.pack()
    
    self.pricePerGallonLabel = Label(master, text="Price per gallon").pack()
    self.pricePerGallonBox = Entry(master)
    self.pricePerGallonBox.insert(END, "3.15")
    self.pricePerGallonBox.pack()
    
    self.commuteCostLabel = Label(master, textvariable=self.commuteCost).pack()
    self.commuteCostPerMonthLabel = Label(master, textvariable=self.commuteCostPerMonth).pack()
    #distance to work, miles per gallon, gas cost per gallon
    self.calculateButton = Button(master, text="Calculate Commute Cost", command=calculateCommuteCost).pack()

    
    
root = Tk()
gui = GUI(root)

root.mainloop()