'''
Copyright 2021 Sagar Acharya
'''

import gi

gi.require_version("Gtk", "3.0")
from gi.repository import Gtk

def change_window(hide_win, show_win):
	hide_win.hide()
	show_win.show_all()

def verify_pin(button):
	change_window(home, pay)

def pay_money(button):
	change_window(pay, confirm)

def verify_transaction(button):
	change_window(confirm, end)

def pay_again(button):
	change_window(end, pay)

#===== CREATE HOME PAGE ===========================================
home = Gtk.Window(title="gnUPI")
home.set_border_width(10)
home.set_default_size(720,1440)

grid = Gtk.Grid()

grid.attach(Gtk.Label(label="UPI Login Pin", xalign=0), 2, 2, 1, 1)
eb = Gtk.Entry()
eb.set_max_length(4)
eb.set_visibility(False)
grid.attach(eb, 2, 3, 1, 1)
home_sub = Gtk.Button.new_with_label("Submit")
grid.attach(home_sub, 2, 4, 1, 1)

home.add(grid)

home_sub.connect("clicked", verify_pin)
home.connect("destroy", Gtk.main_quit)


#===== CREATE PAYMENT PAGE ===========================================
pay = Gtk.Window(title="Payment Page")
pay.set_border_width(10)
pay.set_default_size(720,1440)

grid_ex = Gtk.Grid()

grid_ex.attach(Gtk.Label(label="UPI ID", xalign=0), 2, 2, 1, 1)
grid_ex.attach(Gtk.Entry(), 4, 2, 1, 1)
grid_ex.attach(Gtk.Label(label="Amount", xalign=0), 2, 3, 1, 1)
grid_ex.attach(Gtk.Entry(), 4, 3, 1, 1)
grid_ex.attach(Gtk.Label(label="Remarks(Optional)", xalign=0), 2, 4, 1, 1)
grid_ex.attach(Gtk.Entry(), 4, 4, 1, 1)
pay_but = Gtk.Button.new_with_label("Pay")
grid_ex.attach(pay_but, 2, 5, 1, 1)

pay.add(grid_ex)

pay_but.connect("clicked", pay_money)
pay.connect("destroy", Gtk.main_quit)


#===== CREATE CONFIRM PAGE ===========================================
confirm = Gtk.Window(title="Confirm")
confirm.set_border_width(10)
confirm.set_default_size(720,1440)

confirm_grid = Gtk.Grid()

confirm_grid.attach(Gtk.Label(label="Enter Transaction Pin", xalign=0), 2, 2, 1, 1)
transact = Gtk.Entry()
transact.set_max_length(4)
transact.set_visibility(False)
confirm_grid.attach(transact, 2, 3, 1, 1)
confirm_sub = Gtk.Button.new_with_label("Confirm")
confirm_grid.attach(confirm_sub, 2, 4, 1, 1)

confirm.add(confirm_grid)

confirm_sub.connect("clicked", verify_transaction)
confirm.connect("destroy", Gtk.main_quit)


#===== CREATE EXIT PAGE ===========================================
end = Gtk.Window(title="End")
end.set_border_width(10)
end.set_default_size(720,1440)

exit_grid = Gtk.Grid()

exit_grid.attach(Gtk.Label(label="Payment Done", xalign=0), 2, 2, 1, 1)

again = Gtk.Button.new_with_label("Home")
exit_grid.attach(again, 2, 4, 1, 1)

end.add(exit_grid)

again.connect("clicked", pay_again)
end.connect("destroy", Gtk.main_quit)
#===================================================================


home.show_all()
Gtk.main()