from tkinter import *
from tkinter import ttk
import urllib.request
import json
from tkinter import messagebox
 
 
root = Tk()
root.title('Конвертер валют')
 
winx = 300
winy =250
x = (root.winfo_screenwidth()/2 - winx/2)
y = (root.winfo_screenheight()/2 - root.winfo_reqheight()/2)
root.wm_geometry("%dx%d+%d+%d" % (winx,winy,x, y))
 
root.resizable(False, False)
 
START_AMOUNT = 100000
 
 
# Functions
def exchange():
    e_usd.delete(0, END)
    e_eur.delete(0, END)
    e_rur.delete(0, END)
    try:
        e_usd.insert(0, round(float(e_uah.get()) / float(JSON_object[0]['sale']), 2))
        e_eur.insert(0, round(float(e_uah.get()) / float(JSON_object[1]['sale']), 2))
        e_rur.insert(0, round(float(e_uah.get()) / float(JSON_object[2]['sale']), 2))
    except:
        messagebox.showwarning('Warning', 'Проверьте введенную сумму')
 
 
try:
    html = urllib.request.urlopen('https://api.privatbank.ua/p24api/pubinfo?json&exchange&coursid=5')
    data = html.read()
    JSON_object = json.loads(data)
except:
    messagebox.showerror("Error", 'Ошибка получения курсов валют')
 
 
# Header Frame
header_frame = Frame(root)
header_frame.pack(fill=X)
header_frame.grid_columnconfigure(0, weight=1)
header_frame.grid_columnconfigure(1, weight=1)
header_frame.grid_columnconfigure(2, weight=1)
 
# Header
h_currency = Label(header_frame, text="Валюта", bg="#ccc", font="Arial 12 bold")
h_currency.grid(row=0, column=0, sticky=EW)
h_buy = Label(header_frame, text="Покупка", bg="#ccc", font="Arial 12 bold")
h_buy.grid(row=0, column=1, sticky=EW)
h_sale = Label(header_frame, text="Продажа", bg="#ccc", font="Arial 12 bold")
h_sale.grid(row=0, column=2, sticky=EW)
 
# USD course
usd_currency = Label(header_frame, text="USD", font="Arial 10")
usd_currency.grid(row=1, column=0, sticky=EW)
usd_buy = Label(header_frame, text=JSON_object[0]['buy'], font="Arial 10")
usd_buy.grid(row=1, column=1, sticky=EW)
usd_sale = Label(header_frame, text=JSON_object[0]['sale'], font="Arial 10")
usd_sale.grid(row=1, column=2, sticky=EW)
 
# EUR course
eur_currency = Label(header_frame, text="EUR", bg="#ccc", font="Arial 10")
eur_currency.grid(row=2, column=0, sticky=EW)
eur_buy = Label(header_frame, text=JSON_object[1]['buy'], bg="#ccc", font="Arial 10")
eur_buy.grid(row=2, column=1, sticky=EW)
eur_sale = Label(header_frame, text=JSON_object[1]['sale'], bg="#ccc", font="Arial 10")
eur_sale.grid(row=2, column=2, sticky=EW)
 
# RUR course
rur_currency = Label(header_frame, text="RUR", font="Arial 10")
rur_currency.grid(row=3, column=0, sticky=EW)
rur_buy = Label(header_frame, text=JSON_object[2]['buy'], font="Arial 10")
rur_buy.grid(row=3, column=1, sticky=EW)
rur_sale = Label(header_frame, text=JSON_object[2]['sale'], font="Arial 10")
rur_sale.grid(row=3, column=2, sticky=EW)
 
# Calc Frame
calc_frame = Frame(root, bg="#fff")
calc_frame.pack(expand=1, fill=BOTH)
calc_frame.grid_columnconfigure(1, weight=1)
 
# UAH
l_uah = Label(calc_frame, text="Гривна:", bg="#fff", font="Arial 10 bold")
l_uah.grid(row=0, column=0, padx=10)
e_uah = ttk.Entry(calc_frame, justify=CENTER, font="Arial 10")
e_uah.grid(row=0, column=1, columnspan=2, pady=10, padx=10, sticky=EW)
e_uah.insert(0, START_AMOUNT)
 
# Button
btn_calc = ttk.Button(calc_frame, text="Обмен", command=exchange)
btn_calc.grid(row=1, column=1, columnspan=2, sticky=EW, padx=10)
 
# Result Frame
res_frame = Frame(root)
res_frame.pack(expand=1, fill=BOTH, pady=5)
res_frame.grid_columnconfigure(1, weight=1)
 
# USD
l_usd = Label(res_frame, text="USD:", font="Arial 10 bold")
l_usd.grid(row=2, column=0)
e_usd = ttk.Entry(res_frame, justify=CENTER, font="Arial 10")
e_usd.grid(row=2, column=1, columnspan=2, padx=10, sticky=EW)
e_usd.insert(0, round(START_AMOUNT / float(JSON_object[0]['sale']), 2))
 
# EUR
l_eur = Label(res_frame, text="EUR:", font="Arial 10 bold")
l_eur.grid(row=3, column=0)
e_eur = ttk.Entry(res_frame, justify=CENTER, font="Arial 10")
e_eur.grid(row=3, column=1, columnspan=2, padx=10, sticky=EW)
e_eur.insert(0, round(START_AMOUNT / float(JSON_object[1]['sale']), 2))
 
# RUR
l_rur = Label(res_frame, text="RUR:", font="Arial 10 bold")
l_rur.grid(row=4, column=0)
e_rur = ttk.Entry(res_frame, justify=CENTER, font="Arial 10")
e_rur.grid(row=4, column=1, columnspan=2, padx=10, sticky=EW)
e_rur.insert(0, round(START_AMOUNT / float(JSON_object[2]['sale']), 2))
 
root.mainloop()