main.py

import json
import random
import string
from pathlib import Path

class Bank:
    database = 'data.json'
    data = []

    try:
        if Path(database).exists():
            with open(database) as fs:
                data = json.loads(fs.read())
        else:
            print("No such file exist ")        
    except Exception as err:
        print(f"An exception occured as {err}")

    @classmethod
    def __update(cls):
        with open(cls.database,'w') as fs:
            fs.write(json.dumps(Bank.data))
             
    @classmethod
    def __accountgenerate(cls):
        alpha = random.choices(string.ascii_letters,k=3)
        num = random.choices(string.digits,k=3)
        spchar = random.choices("!@#$%^&*",k=1)
        id = alpha+num+spchar
        random.shuffle(id)
        return "".join(id)

    def Createaccount(self):
        info = {
            "name": input("Enter your name: "),
            "age": int(input("Enter Your age: ")),
            "Email": input("Enter your Email: "),
            "Pin": int(input("Enter Pin: ")),
            "account":Bank.__accountgenerate(),
            "balance":0
         }
        if info['age'] < 18 or len(str(info['Pin'])) !=4:
            print("Sorry you can't create your account")
        else:
            print("Account has been created succesfully")
            for i in info:
                print(f"{i}:{info[i]}")
            print("Please note down your account number")
            
            Bank.data.append(info)
            Bank.__update()

    def depositmoney(self):
        accnumber = input("Please Enter your Account number: ")
        pin = int(input("Please Enter your pin Aswell: "))

        userdata = [i for i in Bank.data if i['account'] == accnumber and i['Pin'] == pin]
        
        if not userdata:   
            print("Sorry No data found")
        else:
            amount = int(input("How much you want to deposit: "))   
            if amount > 100000:
                print("Sorry the amount is too much you can deposit upto 100000")
            else:
                userdata[0]['balance'] += amount
                Bank.__update()    
                print("Amount deposited succesfully")

        print(Bank.data)

    def showdetails(self):
        accnumber = input("please Enter your Account number: ")
        pin = int(input("please Enter your pin Aswell "))

        userdata = [i for i in Bank.data if i['account'] == accnumber and i['Pin'] == pin]    
        
        if not userdata:   
            print("No user found")
            return

        print("Your info:\n")
        for i in userdata[0]:
            print(f"{i}:{userdata[0][i]}")

    def updatedetails(self):
        accnumber = input("please Enter your Account number: ")
        pin = int(input("please Enter your pin Aswell "))

        userdata = [i for i in Bank.data if i['account'] == accnumber and i['Pin'] == pin] 

        if not userdata:   
            print("User not found! ")
        else:
            print("You can't change Age and Account number ")
            print("Fill the details for change or leave it empty if no change ")       

            newdata = {
                "name": input("please Enter your name or enter to skip :"),
                "Email": input("Enter the email or enter to skip : "),   
                "Pin": input("enter new Pin or press enter to skip: ")   
            }

            if newdata["name"] == "":
                newdata["name"] = userdata[0]["name"]   
            if newdata["Email"] == "":
                newdata["Email"] = userdata[0]["Email"]   
            if newdata["Pin"] == "":
                newdata["Pin"] = userdata[0]["Pin"] 

            newdata['age'] = userdata[0]['age']
            newdata['account'] = userdata[0]['account']
            newdata['balance'] = userdata[0]['balance']

            if type(newdata['Pin']) == str:
                newdata['Pin'] = int(newdata["Pin"])

            
            for i in newdata:
                if newdata[i] == userdata[0][i]:
                    continue
                else:
                    userdata[0][i] = newdata[i]
            
            Bank.__update()
            print("Details updated successfully")

    def Delete(self):
        accnumber = input("please Enter your Account number: ")
        pin = int(input("please Enter your pin Aswell "))

        userdata = [i for i in Bank.data if i['account'] == accnumber and i['Pin'] == pin] 

        if not userdata:
            print("Sorrt no such data: ")
        else:
            check = input("press y if you actually want to delete ")
            if check == 'n' or check =='N':
                print("Bypassed")
            else:
                index = Bank.data.index(userdata[0])
                Bank.data.pop(index)
                print("Account Deleted SUccesfully ")
                Bank.__update()        










    def withdrawmoney(self):
        accnumber = input("Please Enter your Account number: ")
        pin = int(input("Please Enter your pin Aswell: "))
    
        userdata = [i for i in Bank.data if i['account'] == accnumber and i['Pin'] == pin]
        
        if not userdata:   
            print("Sorry No data found")
        else:
            amount = int(input("Please Enter the Withdrawal amount : "))   
            if userdata[0]['balance'] < amount:
                print("insufficient Balance")
            else:
                userdata[0]['balance'] -= amount
                Bank.__update()    
                print("Amount withdrawn succesfully")
    
        print(Bank.data) 

user = Bank()

print("Press 1 for creating an account: ")
print("Press 2 for Depositing the money in the bank: ")
print("Press 3 for Withdrawing the money: ")
print("press 4 for details: ")
print("press 5 for updating the details ")
print("Press 6 for Deleting your account: ")

check = int(input("Enter your Response: "))

if check == 1:
    user.Createaccount()

if check == 2:
    user.depositmoney()   

if check == 3:
    user.withdrawmoney()

if check == 4:
    user.showdetails()    

if check == 5:
    user.updatedetails()

if check == 6:
    user.Delete()