import time
import random
from kivy.app import App
from kivy.uix.button import Label
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import StringProperty
from kivy.uix.popup import Popup
from kivy.core.window import Window


class IsprimeApp(App):

    def build(self):

        def avg(lst):
            return sum(lst) / len(lst)

        def get_font(size):
            return str(avg(Window.size) / (10 - size)) + "sp"

        parent = BoxLayout(orientation="vertical")
        number_input = TextInput(
            text=str(random.randint(5, 10 ** 10)), font_size=get_font(3))
        parent.add_widget(number_input)
        btn = Button(text='Is prime?', font_size=get_font(3))

        def callback(instance):
            def isprime(n):
                MAX_TIME = 1
                WRONG_TYPE = "Enter a number"
                MAX = 10 ** 17
                TOO_BIG = "The number must be less than 10^17"
                NO = "No, {} is not prime".format(n)
                YES = "Yes, {} is prime".format(n)
                try:
                    n = int(n)
                except:
                    return WRONG_TYPE
                if n > MAX:
                    return TOO_BIG
                if n in (0, 1):
                    return NO
                if n % 2 == 0 and n != 2:
                    return NO
                upper_limit = int((n ** 0.5) + 1)
                for i in range(3, upper_limit, 2):
                    if n % i == 0:
                        return NO
                return YES

            content = BoxLayout(orientation="vertical")
            content.add_widget(
                Label(text=str(isprime(number_input.text)),
                      font_size=get_font(-15)))
            dismiss = Button(text="OK", font_size=get_font(2))
            content.add_widget(dismiss)
            popup = Popup(title='Is the number prime?',
                          content=content,
                          size_hint=(1, 1),
                          font_size=get_font(2))
            dismiss.bind(on_press=popup.dismiss)
            popup.open()

        btn.bind(on_press=callback)
        parent.add_widget(btn)
        return parent

if __name__ in ('__main__','__android__'):
    IsprimeApp().run()