BankingSystem.py

#imports
from tkinter import *
import os
from PIL import ImageTk, Image

# Main Page
MainPage = Tk()
def login():

    global loginNameCheck_
    global loginPassCheck_
    global loginButtonT
    global loginPage
    loginNameCheck_ = StringVar()
    loginPassCheck_ = StringVar()
    loginPage = Toplevel(MainPage)
    loginPage.title('Login')
    Label(loginPage, text="Login to your account", font=('Modern',14)).pack()
    Label(loginPage, text="Username", font=('Modern',14)).pack()
    Label(loginPage, text="Password", font=('Modern',14)).pack()
    loginButtonT = Label(loginPage, font=('Modern',14))
    loginButtonT.pack()

    Entry(loginPage, textvariable=loginNameCheck_).pack()
    Entry(loginPage, textvariable=loginPassCheck_,show="*").pack()
    Button(loginPage, text="Login", command=loginButton, width=15,font=('Modern',14)).pack()


def loginButton():
    global nameCheckLogin
    allCustomerInformation = os.listdir()
    nameCheckLogin = loginNameCheck_.get()
    passLoginCheck = loginPassCheck_.get()

    for name in allCustomerInformation:
        if name == nameCheckLogin:
            customerInfo = open(name,"r")
            customerInfoDist = customerInfo.read()
            customerInfoDist = customerInfoDist.split('\n')
            password  = customerInfoDist[1]

            #Customer Account Details
            if passLoginCheck == password:
                loginPage.destroy()
                coustomerAccountDetails = Toplevel(MainPage)
                coustomerAccountDetails.title('Details')

                Label(coustomerAccountDetails, text="Customer Account Details", font=('Modern',14)).pack()
                Label(coustomerAccountDetails, text="Hello "+ name, font=('Modern',14)).pack()
                
                Button(coustomerAccountDetails, text="Customer's Personal Details",font=('Modern',14),width=30,command=customerPersonalDetail).pack()
                Button(coustomerAccountDetails, text="Deposit",font=('Modern',14),width=30,command=deposit).pack()
                Button(coustomerAccountDetails, text="Withdraw",font=('Modern',14),width=30,command=withdraw).pack()
                Button(coustomerAccountDetails, text="Transfer",font=('Modern',14),width=30,command=transfer).pack()
                Label(coustomerAccountDetails).pack()
                return
            else:
                loginButtonT.config(fg="red", text="ERROR!!! Password incorrect!!")
                return
    loginButtonT.config(fg="red", text=" account invalid. ")

def register():
    
    global cusotmerName
    global customerAge
    global cusotmerGender
    global customerPass

    cusotmerName = StringVar()
    customerAge = StringVar()
    cusotmerGender = StringVar()
    customerPass = StringVar()
    
    
    
    #Register Page
    registerPage = Toplevel(MainPage)
    registerPage.title('Register')
    global button_1

    Label(registerPage, text="Input credientails to open an bank account.", font=('Modern',14)).pack()
    Label(registerPage, text="Name", font=('Modern',14)).pack()
    Label(registerPage, text="Age", font=('Modern',14)).pack()
    Label(registerPage, text="Gender", font=('Modern',14)).pack()
    Label(registerPage, text="Password", font=('Modern',14)).pack()
    button_1 = Label(registerPage, font=('Modern',14))
    button_1.pack()

    Entry(registerPage,textvariable=cusotmerName).pack()
    Entry(registerPage,textvariable=customerAge).pack()
    Entry(registerPage,textvariable=cusotmerGender).pack()
    Entry(registerPage,textvariable=customerPass,show="*").pack()


    Button(registerPage, text="Register", command = registerButton, font=('Modern',14)).pack()


def registerButton():
    name = cusotmerName.get()
    age = customerAge.get()
    gender = cusotmerGender.get()
    password = customerPass.get()
    global allCustomerInformation
    allCustomerInformation = os.listdir()


    if name == "" or age == "" or gender == "" or password == "":
        button_1.config(fg="red",text="All fields requried * ")
        return

    for name_check in allCustomerInformation:
        if name == name_check:
            button_1.config(fg="red",text="Please re-try, Account already exists")
            return
        else:
            new_customerInfo = open(name,"w")
            new_customerInfo.write(name + '\n')   
            new_customerInfo.write(password + '\n')
            new_customerInfo.write(age + '\n')
            new_customerInfo.write(gender +'\n')
            new_customerInfo.write('0')
            new_customerInfo.close()
            button_1.config(fg="green", text="Account has been created")

def deposit():

    global amount
    global buttonDeposit
    global avaliableBalanceDisplay
    amount = StringVar()
    customerInfo   = open(nameCheckLogin, "r")
    customerInfoDist = customerInfo.read()
    customerInfoAll = customerInfoDist.split('\n')
    customerBalanceAll = customerInfoAll[4]
    
    #Deposit Screen
    depositPage = Toplevel(MainPage)
    depositPage.title('Deposit')

    Label(depositPage, text="Deposit", font=('Modern',14)).pack()
    avaliableBalanceDisplay = Label(depositPage, text="Current Balance : £"+customerBalanceAll, font=('Modern',14))
    avaliableBalanceDisplay.pack()
    Label(depositPage, text="Amount : ", font=('Modern',14)).pack()
    buttonDeposit = Label(depositPage,font=('Modern',14))
    buttonDeposit.pack()

    Entry(depositPage, textvariable=amount).pack()
    Button(depositPage,text="Finish",font=('Modern',14),command=completeDeposit).pack()

def completeDeposit():
    if amount.get() == "":
        buttonDeposit.config(text='Valid amount is needed!',fg="red")
        return
    if float(amount.get()) <=0:
        buttonDeposit.config(text='The entered value is invalid!', fg='red')
        return

    customerInfo = open(nameCheckLogin, 'r+')
    customerInfoDist = customerInfo.read()
    details = customerInfoDist.split('\n')
    balanceAvaliable = details[4]
    balanceNew = balanceAvaliable
    balanceNew = float(balanceNew) + float(amount.get())
    customerInfoDist = customerInfoDist.replace(balanceAvaliable, str(balanceNew))
    customerInfo.seek(0)
    customerInfo.truncate(0)
    customerInfo.write(customerInfoDist)
    customerInfo.close()

    avaliableBalanceDisplay.config(text="Current Balance : £"+str(balanceNew),fg="green")
    buttonDeposit.config(text='Balance Updated', fg='green')

def withdraw():

    global withdrawNeededAmount
    global buttonWithdraw_1
    global avaliableBalanceDisplay
    global customerBalanceAll
    withdrawNeededAmount = StringVar()
    customerInfo   = open(nameCheckLogin, "r")
    customerInfoDist = customerInfo.read()
    customerInfoAll = customerInfoDist.split('\n')
    customerBalanceAll = customerInfoAll[4]
    #Withdraw Page
    withdrawPage = Toplevel(MainPage)
    withdrawPage.title('Withdraw')

    Label(withdrawPage, text="Deposit", font=('Modern',14)).pack()
    avaliableBalanceDisplay = Label(withdrawPage, text="Current Balance : £"+customerBalanceAll, font=('Modern',14))
    avaliableBalanceDisplay.pack()
    Label(withdrawPage, text="Amount : ", font=('Modern',14)).pack()
    buttonWithdraw_1 = Label(withdrawPage,font=('Modern',14))
    buttonWithdraw_1.pack()

    Entry(withdrawPage, textvariable=withdrawNeededAmount).pack()

    Button(withdrawPage,text="Finish",font=('Modern',14),command=completeWithdraw).pack()

def completeWithdraw():
    if withdrawNeededAmount.get() == "":
        buttonWithdraw_1.config(text='Amount is required!',fg="red")
        return
    if float(withdrawNeededAmount.get()) <=0:
        buttonWithdraw_1.config(text='PLease do not exceed the avaliable balance.', fg='red')
        return

    customerInfo = open(nameCheckLogin, 'r+')
    customerInfoDist = customerInfo.read()
    details = customerInfoDist.split('\n')
    balanceAvaliable = details[4]

    if float(withdrawNeededAmount.get()) >float(balanceAvaliable):
        buttonWithdraw_1.config(text='Insufficient Funds!', fg='red')
        return

    balanceNew = balanceAvaliable
    balanceNew = float(balanceNew) - float(withdrawNeededAmount.get())
    customerInfoDist       = customerInfoDist.replace(balanceAvaliable, str(balanceNew))
    customerInfo.seek(0)
    customerInfo.truncate(0)
    customerInfo.write(customerInfoDist)
    customerInfo.close()

    avaliableBalanceDisplay.config(text="Current Balance : £"+str(balanceNew),fg="green")
    buttonWithdraw_1.config(text='Balance has been Updated.', fg='green')

def customerPersonalDetail():

    customerInfo = open(nameCheckLogin, 'r')
    customerInfoDist = customerInfo.read()
    customerInfoAll = customerInfoDist.split('\n')
    namesDetailAll = customerInfoAll[0]
    ageDetailAll = customerInfoAll[2]
    genderDetailAll = customerInfoAll[3]
    customerBalanceAll = customerInfoAll[4]

    #Customer Personal details Page
    customerDetailPage = Toplevel(MainPage)
    customerDetailPage.title('Personal Details')

    Label(customerDetailPage, text="Personal Details", font=('Modern',14)).pack()
    Label(customerDetailPage, text="Name : "+ namesDetailAll, font=('Modern',14)).pack()
    Label(customerDetailPage, text="Age : "+ ageDetailAll, font=('Modern',14)).pack()
    Label(customerDetailPage, text="Gender : "+ genderDetailAll, font=('Modern',14)).pack()
    Label(customerDetailPage, text="Balance :£"+ customerBalanceAll, font=('Modern',14)).pack()

def transfer():
    global transferToCheck
    global transferAmountCheck
    global transferButtonT
    transferToCheck = StringVar()
    transferAmountCheck = StringVar()
    transferPage = Toplevel(MainPage)
    transferPage.title('Transfer')
    Label(transferPage, text="Transfer Money", font=('Modern',14)).pack()
    Label(transferPage, text="Enter Recipient's Username:", font=('Modern',14)).pack()
    Entry(transferPage, textvariable=transferToCheck).pack()
    Label(transferPage, text="Enter Amount to Transfer:", font=('Modern',14)).pack()
    Entry(transferPage, textvariable=transferAmountCheck).pack()
    transferButtonT = Label(transferPage, font=('Modern',14))
    transferButtonT.pack()
    Button(transferPage, text="Transfer", command=transferButton, font=('Modern',14)).pack()

def transferButton():
    global transferToCheck
    global transferAmountCheck
    global transferButtonT
    recipient = transferToCheck.get()
    amount = transferAmountCheck.get()
    sender_balance = 0
    recipient_balance = 0
    sender_info = open(nameCheckLogin,"r")
    sender_info_dist = sender_info.read()
    sender_info_all = sender_info_dist.split('\n')
    sender_balance_all = sender_info_all[4]
    if amount == "" or recipient == "":
        transferButtonT.config(fg="red", text="All fields required *")
        return
    try:
        amount = int(amount)
        if amount < 1:
            transferButtonT.config(fg="red", text="Invalid Amount")
            return
    except ValueError:
        transferButtonT.config(fg="red", text="Invalid Amount")
        return

    allCustomerInformation = os.listdir()

    if recipient not in allCustomerInformation:
        transferButtonT.config(fg="red", text="Recipient Does Not Exist")
        return
    else:
        recipient_info = open(recipient,"r")
        recipient_info_dist = recipient_info.read()
        recipient_info_all = recipient_info_dist.split('\n')
        recipient_balance_all = recipient_info_all[4]
        try:
            sender_balance = int(sender_balance_all)
            recipient_balance = int(recipient_balance_all)
        except ValueError:
            transferButtonT.config(fg="red", text="Invalid Account Balance")
            return

        if sender_balance < amount:
            transferButtonT.config(fg="red", text="Insufficient Balance")
            return

        sender_balance -= amount
        recipient_balance += amount

        sender_info = open(nameCheckLogin,"w")
        sender_info.write(sender_info_all[0]+'\n')
        sender_info.write(sender_info_all[1]+'\n')
        sender_info.write(sender_info_all[2]+'\n')
        sender_info.write(sender_info_all[3]+'\n')
        sender_info.write(str(sender_balance))
        sender_info.close()

        recipient_info = open(recipient,"w")
        recipient_info.write(recipient_info_all[0]+'\n')
        recipient_info.write(recipient_info_all[1]+'\n')
        recipient_info.write(recipient_info_all[2]+'\n')
        recipient_info.write(recipient_info_all[3]+'\n')
        recipient_info.write(str(recipient_balance))
        recipient_info.close()

        transferButtonT.config(fg="green", text="Transfer Successful")
        avaliableBalanceDisplay.config(text="Available Balance: £"+ str(sender_balance))



# Images used for visual purposes
LogoImage = Image.open('Bank_of_Ceylon.svg.png') # the image is from google.co.uk
LogoImage = LogoImage.resize((185,185))
LogoImage = ImageTk.PhotoImage(LogoImage)


Label(MainPage, text = "BankOfCeylon", font=('Modern',28)).pack()
Label(MainPage, text = "A simple banking system designed to be used by all type of audience.", font=('Modern',14)).pack()
Label(MainPage, image=LogoImage).pack()


Button(MainPage, text="Register", font=('Modern',14),width=20,command=register).pack()
Button(MainPage, text="Login", font=('Modern',14),width=20,command=login).pack()

MainPage.title('BankingSystem')
MainPage.mainloop()