from tkinter import Tk,Scale,Label,Entry, Button, PhotoImage,HORIZONTAL,LEFT ,RIGHT, IntVar, StringVar
from tkinter.messagebox import showinfo

class CateringCalcSlider(Tk):

    def __init__(self,parent=None):
        super(CateringCalcSlider,self).__init__()
        self.title("Catering Calculator")
        self.geometry("250x200")
        self.cost_per_plate = IntVar()
        self.guests = IntVar()
        self.tip = IntVar()
        self.total_cost = StringVar()
        self.make_widgets()

    def updateValues(self,event):
        cpp=self.cost_per_plate.get()
        guests=self.guests.get()
        tip_percent=self.tip.get()
        total_cost= self.total_cost()
        total_cost = cpp*guests
        tip=total_cost*(tip_percent/100)
        total_cost+=tip
        self.total_cost.set("${:,.2f}".format(total_cost))


    def make_widgets(self):
        Label(self, text="Catering Calculator").grid(row=0, column=1)
        Label(self, text="Cost Per Plate:").grid(row=1, column=0)
        Scale(self, from_=0, to=100, orient=HORIZONTAL, resolution=10, variable=self.cost_per_plate, command=lambda e:self.updateValues()).grid(row=1, column=1)
        Label(self, text="Guests:").grid(row=2, column=0)
        Scale(self, from_=0, to=100, orient=HORIZONTAL, variable=self.guests, command=lambda e: self.updateValues()).grid(row=2, column=1)
        Label(self, text="Tip:").grid(row=3, column=0)
        Scale(self, from_=0, to=25, orient=HORIZONTAL, resolution=5, variable=self.tip, command=lambda e: self.updateValues()).grid(row=3, column=1)
        Label(self, text="", textvariable=self.total_cost).grid(row=4, column=1)