now.py

from tkinter import *
import tkinter.font as font         # imports font module and being imported as font. It helps to define a specific font style
import random

global_balance = 10000


win = Tk()                          # creates the window
win.title('AUTOMATIC TELLER MACHINE-ATM')
win.geometry('460x390')             # sets the dimension of the window

tim40 = font.Font(family='Times', size=40, weight='bold', slant='italic', underline=1)      # Font is an instance which contains parameter as
                                                                                            # family(the font style), size, weight(bold,normal)
                                                                                            # slant(italic,roman(non-italic)), underline(1-yes,0-no),
                                                                                            # overstrike(1-yes,0-no) and many more
cour20 = font.Font(family='Courier', size=20, weight='bold')
cour15 = font.Font(family='Courier', size=15, weight='bold')

glob_count = 0                      # this is used to access balance_func() after press yes in question_func()




    
    


# displays message after selecting no in question_func()
def display_func():

    question_func.question_win.withdraw()
    display_win = Toplevel(win)
    display_win.geometry('460x390')
    message = Message(display_win, text='\n\nYour transaction has been successful\n\nThank you for using our', font=cour20, fg='blue')
    message.pack()
    text = Label(display_win, text='ATM', font=tim40, fg='red')
    text.pack()

    exit_button = Button(display_win, text='EXIT', font=cour15, fg='red', command=lambda: win.destroy())
    exit_button.pack(side=BOTTOM, pady=10)


# window asking whether to show balance or not
def question_func():

    global glob_count
    glob_count+=1

    withdrawal_func.withdrawal_win.withdraw()
    question_func.question_win = Toplevel(win)
    question_func.question_win.geometry('460x390')

    bf = Frame(question_func.question_win)
    bf.pack(side=BOTTOM)

    msg_box = Message(question_func.question_win, text='\nYour transaction has been successful\n\nPlease collect your money\n\nYou can remove your card\n\nDo you want to check your balance?', font=cour20, fg='blue')
    msg_box.pack()

    yes_btn = Button(bf, text='YES', font=cour15, fg='green', command=balance_func)
    yes_btn.pack(side=LEFT, pady=10)

    no_btn = Button(bf, text=' NO ', font=cour15, fg='red', command=display_func)
    no_btn.pack(pady=10, padx=10)


# Initialize global balance variable
def withdrawal_func():
    option_func.option_win.withdraw()
    withdrawal_func.withdrawal_win = Toplevel(win)
    withdrawal_func.withdrawal_win.geometry('460x390')

    enter_lbl = Label(withdrawal_func.withdrawal_win, text='\nPlease enter amount\n', font=cour20, fg='red')
    enter_lbl.pack()
    money_entry = Entry(withdrawal_func.withdrawal_win, font=cour15, justify='center')
    money_entry.pack()

    bf = Frame(withdrawal_func.withdrawal_win)
    bf.pack(side=BOTTOM)

    bf4 = Frame(withdrawal_func.withdrawal_win)
    bf4.pack(side=BOTTOM)

    bf3 = Frame(withdrawal_func.withdrawal_win)
    bf3.pack(side=BOTTOM)

    bf2 = Frame(withdrawal_func.withdrawal_win)
    bf2.pack(side=BOTTOM)

    bf1 = Frame(withdrawal_func.withdrawal_win)
    bf1.pack(side=BOTTOM)

    # Number buttons (1-9)
    for i in range(1, 10):
        button = Button(bf1 if i < 4 else bf2 if i < 7 else bf3, text=str(i), font=cour15, command=lambda i=i: money_entry.insert('end', str(i)))
        button.pack(side=LEFT, padx=10)

    # Zero button
    b0 = Button(bf4, text='0', font=cour15, command=lambda: money_entry.insert('end', '0'))
    b0.pack(side=LEFT, padx=10)

    # Enter and Clear buttons
    enter_btn = Button(bf, text='ENTER', font=cour15, fg='red', command=lambda: question_func(money_entry.get()))
    enter_btn.pack(side=LEFT, pady=10)

    clear_btn = Button(bf, text='CLEAR', font=cour15, fg='red', command=lambda: money_entry.delete(0, END))
    clear_btn.pack(side=LEFT, padx=10)

def question_func(amount_str):
    global global_balance

    try:
        amount = int(amount_str)
        if amount <= 0:
            print("Please enter a valid amount.")
            return
        if amount > global_balance:
            print("Insufficient funds.")
            return
        
        global_balance -= amount  # Deduct the amount from the balance
        balance_func()  # Show balance after withdrawal
    except ValueError:
        print("Please enter a valid number.")

def balance_func():
    global glob_count

    if glob_count == 1:
        question_func.question_win.withdraw()

    option_func.option_win.withdraw()
    balance_win = Toplevel(win)
    balance_win.geometry('460x390')
    
    message = Message(balance_win, text=f'\nYour transaction is successful\n\nAvailable Balance: {global_balance}\n\nThank you for using our', font=cour20, fg='blue')
    message.pack()
    text = Label(balance_win, text='ATM', font=tim40, fg='red')
    text.pack()

    exit_button = Button(balance_win, text='EXIT', font=cour15, fg='red', command=lambda: win.destroy())
    exit_button.pack(side=BOTTOM, pady=10)






# displays message after change has been changed
def message_func():
    change_pin_func.change_pin_win.withdraw()
    win2 = Toplevel(win)
    win2.geometry('460x390')
    message = Message(win2, text='\nYour transaction is successful\n\nYour PIN has been successfully changed\n\nThank you for using our', font=cour20, fg='blue')
    message.pack()
    text = Label(win2, text='ATM', font=tim40, fg='orange')
    text.pack()

    exit_button = Button(win2, text='EXIT', font=cour15, fg='blue', command=lambda: win.destroy())
    exit_button.pack(side=BOTTOM, pady=10)


# changing pin function
def change_pin_func():
    option_func.option_win.withdraw()
    change_pin_func.change_pin_win = Toplevel(win)
    change_pin_func.change_pin_win.geometry('460x420')

    pin_lbl = Label(change_pin_func.change_pin_win, text='\nEnter new-PIN', font=cour15, fg='red')
    pin_lbl.pack()
    pin_entry = Entry(change_pin_func.change_pin_win, font=cour15,justify='center', show='*')
    pin_entry.pack()

    re_entry_lbl = Label(change_pin_func.change_pin_win, text='\nRe-enter new-PIN', font=cour15, fg='red')
    re_entry_lbl.pack()
    re_entry = Entry(change_pin_func.change_pin_win, font=cour15, justify='center', show='*')
    re_entry.pack()

    bf = Frame(change_pin_func.change_pin_win)
    bf.pack(side=BOTTOM)

    bf4 = Frame(change_pin_func.change_pin_win)
    bf4.pack(side=BOTTOM)

    bf3 = Frame(change_pin_func.change_pin_win)
    bf3.pack(side=BOTTOM)

    bf3 = Frame(change_pin_func.change_pin_win)
    bf3.pack(side=BOTTOM)

    bf2 = Frame(change_pin_func.change_pin_win)
    bf2.pack(side=BOTTOM)

    bf1 = Frame(change_pin_func.change_pin_win)
    bf1.pack(side=BOTTOM)

    b1 = Button(bf1, text='1', font=cour15, command=lambda: [pin_entry.insert('end','1'), re_entry.insert('end','1')])
    b1.pack(side=LEFT,pady=10)

    b2 = Button(bf1, text='2', font=cour15, command=lambda: [pin_entry.insert('end','2'), re_entry.insert('end','2')])
    b2.pack(side=LEFT, padx=10)

    b3 = Button(bf1, text='3', font=cour15, command=lambda: [pin_entry.insert('end','3'), re_entry.insert('end','3')])
    b3.pack(side=LEFT)

    b4 = Button(bf2, text='4', font=cour15, command=lambda: [pin_entry.insert('end','4'), re_entry.insert('end','4')])
    b4.pack(side=LEFT)

    b5 = Button(bf2, text='5', font=cour15, command=lambda: [pin_entry.insert('end','5'), re_entry.insert('end','5')])
    b5.pack(side=LEFT, padx=10)

    b6 = Button(bf2, text='6', font=cour15, command=lambda: [pin_entry.insert('end','6'), re_entry.insert('end','6')])
    b6.pack(side=LEFT)

    b7 = Button(bf3, text='7', font=cour15, command=lambda: [pin_entry.insert('end','7'), re_entry.insert('end','7')])
    b7.pack(side=LEFT,pady=10)

    b8 = Button(bf3, text='8', font=cour15, command=lambda: [pin_entry.insert('end','8'), re_entry.insert('end','8')])
    b8.pack(side=LEFT, padx=10)

    b9 = Button(bf3, text='9', font=cour15, command=lambda: [pin_entry.insert('end','9'), re_entry.insert('end','9')])
    b9.pack(side=LEFT)

    btn = Button(bf4, text=' ', font=cour15)
    btn.pack(side=LEFT)

    b0 = Button(bf4, text='0', font=cour15, command=lambda: [pin_entry.insert('end','0'), re_entry.insert('end','0')])
    b0.pack(side=LEFT, padx=10)                         # with help of list we can assign multiple functions for buttons

    btn_ = Button(bf4, text=' ', font=cour15)
    btn_.pack(side=LEFT)

    enter_btn = Button(bf, text='ENTER', font=cour15, fg='green', command=message_func )
    enter_btn.pack(side=LEFT, pady=10)

    clear_btn = Button(bf, text='CLEAR', font=cour15, fg='orange', command=lambda: [pin_entry.delete(0), re_entry.delete(0)])
    clear_btn.pack(side=LEFT, padx=10)


# options window
def option_func():
    enter_pin.new_win.withdraw()                # check enter_pin() function for the functionality of .withdraw()
    option_func.option_win = Toplevel(win)
    option_func.option_win.geometry('460x390')
   # option_win.grab_set()                       ## check enter_pin() function for the functionality of .grab_set()

    text_title = Label(option_func.option_win, text='\nATM', font=tim40)
    text_title.pack()

    rf = Frame(option_func.option_win)          #right frame
    rf.pack(side=RIGHT)

    lf = Frame(option_func.option_win)          #left frame
    lf.pack(side=LEFT)

    withdrawal_btn = Button(rf, text=' WITHDRAWAL ', font=cour15, fg='pink', command=withdrawal_func)
    withdrawal_btn.pack(padx=40, pady=10)

    balance_btn = Button(rf, text='BALANCE INQ', font=cour15, command=balance_func)
    balance_btn.pack(padx=40, pady=10)

    change_pin_btn = Button(lf, text='CHANGE PIN', font=cour15, command=change_pin_func)
    change_pin_btn.pack(padx=40, pady=10)

    exit_btn = Button(lf, text='   EXIT   ', font=cour15, fg='red', command=lambda: [option_func.option_win.destroy(), enter_pin.new_win.deiconify()])
    exit_btn.pack(padx=40, pady=10)                                                                         # check enter_pin() function for the functionality of .deiconify()


# enter_pin window
def enter_pin():

    win.withdraw()                              # .withdraw() hides or make the associated window invisible until (.deiconify()) appears

    enter_pin.new_win = Toplevel(win)           # enter_pin.new_win makes the variable new_win as the member of the function object
    enter_pin.new_win.geometry('460x390')       # this helps us to use the variable even outside the function

    #enter_pin.new_win.grab_set()               ## .grab.set() makes the associated window inactive temporarily until the active window is working


    def setInputText(text):
        entry_box.insert('end',text)            # insert allows to enter(display on entry box) the text at the end(if we replace end with 0 the text is placed at front)

    def text_delete():
        entry_box.delete(0)                     # we have another function called delete which deletes text for the given range(.delete(0,'end') deletes the entire text

    lbl = Label(enter_pin.new_win, text='Enter your PIN',font=cour20,fg='red')
    lbl.pack(pady=20)

    entry_box = Entry(enter_pin.new_win, font=cour15, show='*', justify='center')  # show parameter display the input text as *(we can use any other element also)
    entry_box.pack()

    bf = Frame(enter_pin.new_win)
    bf.pack(side=BOTTOM)

    bf0 = Frame(enter_pin.new_win)
    bf0.pack(side=BOTTOM)

    bf1 = Frame(enter_pin.new_win)
    bf1.pack(side=BOTTOM)

    bf2 = Frame(enter_pin.new_win)
    bf2.pack(side=BOTTOM)

    bf3 = Frame(enter_pin.new_win)
    bf3.pack(side=BOTTOM)

    bf4 = Frame(enter_pin.new_win)
    bf4.pack(side=BOTTOM)

    rf = Frame(enter_pin.new_win)
    rf.pack(side=RIGHT)

    btn1 = Button(bf4,text='1',font=cour15, command=lambda:setInputText('1'))
    btn1.pack(side=LEFT, pady=10)

    btn2 = Button(bf4, text='2', font=cour15, command=lambda:setInputText('2'))
    btn2.pack(side=LEFT,padx=10)

    btn3 = Button(bf4, text='3', font=cour15, command=lambda:setInputText('3'))
    btn3.pack(side=LEFT)

    btn4 = Button(bf3, text='4', font=cour15, command=lambda:setInputText('4'))
    btn4.pack(side=LEFT)

    btn5 = Button(bf3, text='5', font=cour15, command=lambda:setInputText('5'))
    btn5.pack(side=LEFT,padx=10)

    btn6 = Button(bf3, text='6', font=cour15, command=lambda:setInputText('6'))
    btn6.pack(side=LEFT)

    btn7 = Button(bf2, text='7', font=cour15, command=lambda:setInputText('7'))
    btn7.pack(side=LEFT,pady=10)

    btn8 = Button(bf2, text='8', font=cour15, command=lambda:setInputText('8'))
    btn8.pack(side=LEFT, padx=10)

    btn9 = Button(bf2, text='9', font=cour15, command=lambda:setInputText('9'))
    btn9.pack(side=LEFT)

    btn = Button(bf1, text=' ', font=cour15)
    btn.pack(side=LEFT)

    btn0 = Button(bf1, text='0', font=cour15, command=lambda:setInputText('0'))
    btn0.pack(side=LEFT, padx=10)

    btn_ = Button(bf1, text=' ', font=cour15)
    btn_.pack(side=LEFT)

    enter_btn = Button(bf0, text='ENTER', font=cour15,fg='green', command=option_func)
    enter_btn.pack(side= LEFT, pady=10,padx=10)

    exit_btn = Button(bf0, text='EXIT', font=cour15, fg='red', command=lambda:[enter_pin.new_win.destroy(), win.deiconify()])   # .deiconify() makes the associated window visible
    exit_btn.pack(side=RIGHT, padx=10)

    clear_btn = Button(bf0,text='CLEAR', font=cour15, fg='orange', command=text_delete)
    clear_btn.pack(side=LEFT)

    note = Label(bf, text='Note:Enter pin either from keyboard or keypad', fg='red')
    note.pack()


# main opening window
title_label = Label(win, text='ATM', font=tim40, fg='red')              # Label is something similar to a label which displays text on the window
title_label.pack(pady=10)                                               # pad y gives vertical distance both above and below where as pad x gives

#displaying some introduction
user_id = random.randrange(1000,10000)
intro = Label(win, text='\nWelcome to  virtual ATM', font=cour20, fg='green')
intro.pack()
option_label = Label(win, text='\nSelect your account type', font=cour15, fg='grey')
option_label.pack()

bottom_frame = Frame(win)
bottom_frame.pack(side=BOTTOM)
right_frame = Frame(win)
right_frame.pack(side=RIGHT)

note = Label(bottom_frame, text='NOTE:Use only EXIT button to exit', font=cour15, fg='red')
note.pack(pady=10)
saving = Button(right_frame, text='Savings', font=cour15, bg='sky blue', fg='red', command=enter_pin)
saving.pack(padx=30, pady=10)
current = Button(right_frame, text="Current", font=cour15, bg='sky blue', fg='red', command=enter_pin)
current.pack(padx=30, pady=10)

win.mainloop()