from tkinter import *
from tkinter import ttk, messagebox

class Application:
    def __init__(self, root):
        root.title('counter example')

        mainFrame = ttk.Frame(root, padding = '4 4 4 4')
        mainFrame.grid(column=0, row=0, sticky=(N, W, S, E))
        root.columnconfigure(0, weight=1)
        root.rowconfigure(0, weight=1)

        incrButton = ttk.Button(mainFrame, text = 'Up', command = self.incrButtonClick)
        incrButton.grid(column=0, row=0, padx=2, pady=2, sticky=(N, S))

        decrButton = ttk.Button(mainFrame, text = 'Dn', command = self.decrButtonClick)
        decrButton.grid(column=0, row=1, padx=2, pady=2, sticky=(N, S))

        resetButton = ttk.Button(mainFrame, text = 'Reset', command = self.resetButtonClick)
        resetButton.grid(column=0, row=2, padx=2, pady=2, sticky=(N, S))

        self.countValue = StringVar()
        countEntry = ttk.Entry(mainFrame, width=3, justify = CENTER, font=('Aptos', 28, 'bold'), textvariable=self.countValue)
        countEntry.grid(column=1, row=0, padx=2, pady=2, rowspan=3, sticky=(N, S, E, W))
        self.countValue.set('42')

    def incrButtonClick(self, **args):
        val = int(self.countValue.get())
        if val == 52:
            messagebox.showinfo(title = 'Stop!!!', message='Meh - the number can\'t go any higher!', icon='error')
        else:
            self.countValue.set(str(val + 1))

    def decrButtonClick(self, **args):
        val = int(self.countValue.get())
        if val == 32:
            messagebox.showinfo(title = 'Stop!!!', message='Meh - the number can\'t go any lower!', icon='error')
        else:
            self.countValue.set(str(val - 1))

    def resetButtonClick(self, **args):
        val = int(self.countValue.get())
        if val == 42:
            messagebox.showinfo(title = 'Stop!!!', message="It's already 42 you numpty!", icon='error')
        else:
            self.countValue.set('42')

def main():
    root = Tk()
    Application(root)
    root.mainloop()

if __name__ == '__main__':
    main()