python.py

import os
import json
import time

# Constants
DATA_FILE = "bank_data.json"
LINE_WIDTH = 70
INVESTMENT_RATE = 0.05  # Fixed interest rate of 5%

# Utility Functions
def separator(symbol="=", length=LINE_WIDTH):
    print(symbol * length)

def fancy_header(title):
    separator("*")
    print(f"{title.center(LINE_WIDTH)}")
    separator("*")

def loading_animation(message="Processing"):
    for _ in range(3):
        print(f"{message}{'.' * _}", end="\r")
        time.sleep(0.5)
    print(" " * 30, end="\r")  # Clear the line

def slow_print(message, delay=0.05):
    for char in message:
        print(char, end="", flush=True)
        time.sleep(delay)
    print()

def load_data():
    if os.path.exists(DATA_FILE):
        with open(DATA_FILE, 'r') as file:
            return json.load(file)
    return {}

def save_data(data):
    with open(DATA_FILE, 'w') as file:
        json.dump(data, file, indent=4)

def validate_positive_number(prompt):
    while True:
        try:
            value = float(input(prompt))
            if value > 0:
                return value
            else:
                print("⚠️ Error: Enter a positive number!")
        except ValueError:
            print("⚠️ Error: Invalid input. Please enter a numeric value!")

def validate_account_number(prompt, existing_accounts=None):
    while True:
        account_number = input(prompt).strip()
        if account_number.isdigit() and len(account_number) == 10:
            if existing_accounts and account_number in existing_accounts:
                print("⚠️ Error: Account number already exists!")
            else:
                return account_number
        else:
            print("⚠️ Error: Account number must be a 10-digit numeric value.")

def authenticate_user(data, account_number):
    if account_number not in data:
        slow_print("⚠️ Error: Account not found!")
        return False
    for attempt in range(3):
        entered_password = input("🔒 Enter account password: ")
        if entered_password == data[account_number]["password"]:
            slow_print("✅ Access granted!")
            return True
        else:
            print(f"⚠️ Incorrect password! {2 - attempt} attempts remaining.")
    slow_print("❌ Access denied! Returning to the main menu.")
    return False

def pause(message="Press Enter to continue..."):
    """Pause to allow users to read messages."""
    input(message)

# Core Banking Functions
def create_account(data):
    fancy_header("CREATE ACCOUNT")
    account_number = validate_account_number("Enter a 10-digit account number: ", data)
    name = input("Enter account holder's full name: ").strip()
    password = input("Set a password for this account: ")
    initial_deposit = validate_positive_number("Enter initial deposit amount: ")
    data[account_number] = {
        "name": name,
        "password": password,
        "balance": initial_deposit,
        "transactions": [{"type": "Deposit", "amount": initial_deposit, "time": time.ctime()}],
        "investments": []
    }
    slow_print(f"✅ Account created successfully for {name}!")
    save_data(data)

def view_account(data):
    fancy_header("VIEW ACCOUNT")
    account_number = input("Enter account number: ").strip()
    if not authenticate_user(data, account_number):
        return
    account = data[account_number]
    print(f"\n📄 Account Details")
    print (f"Account Number: {account_number}")
    print(f"Account Holder : {account['name']}")
    print(f"Balance        : ₹{account['balance']:.2f}\n")
    print("🧾 Transaction History:")
    separator("-")
    for txn in account['transactions']:
        print(f"{txn['type']:<10} ₹{txn['amount']:.2f} | Date: {txn['time']}")
    separator("-")

def deposit_money(data):
    fancy_header("DEPOSIT MONEY")
    account_number = input("Enter account number: ").strip()
    if not authenticate_user(data, account_number):
        return
    amount = validate_positive_number("Enter amount to deposit: ")
    data[account_number]['balance'] += amount
    data[account_number]['transactions'].append({"type": "Deposit", "amount": amount, "time": time.ctime()})
    loading_animation("Updating balance")
    slow_print(f"✅ Deposit successful! New balance: ₹{data[account_number]['balance']:.2f}")
    save_data(data)

def withdraw_money(data):
    fancy_header("WITHDRAW MONEY")
    account_number = input("Enter account number: ").strip()
    if not authenticate_user(data, account_number):
        return
    amount = validate_positive_number("Enter amount to withdraw: ")
    if amount > data[account_number]['balance']:
        slow_print("⚠️ Error: Insufficient balance!")
        return
    data[account_number]['balance'] -= amount
    data[account_number]['transactions'].append({"type": "Withdrawal", "amount": amount, "time": time.ctime()})
    loading_animation("Processing withdrawal")
    slow_print(f"✅ Withdrawal successful! New balance: ₹{data[account_number]['balance']:.2f}")
    save_data(data)

# Investment Functions
def invest_money(data):
    fancy_header("INVEST MONEY")
    account_number = input("Enter account number: ").strip()
    if not authenticate_user(data, account_number):
        return
    amount = validate_positive_number("Enter amount to invest: ")
    if amount > data[account_number]['balance']:
        slow_print("⚠️ Error: Insufficient balance to invest!")
        return
    investment = {
        "amount": amount,
        "rate": INVESTMENT_RATE,
        "start_time": time.ctime()
    }
    data[account_number]['balance'] -= amount
    data[account_number]['investments'].append(investment)
    loading_animation("Processing investment")
    slow_print(f"✅ Successfully invested ₹{amount:.2f} at a rate of {INVESTMENT_RATE * 100:.1f}%!")
    save_data(data)
def view_investments(data):
    fancy_header("VIEW INVESTMENTS")
    account_number = input("Enter account number: ").strip()
    if not authenticate_user(data, account_number):
        return
    investments = data[account_number]['investments']
    if not investments:
        slow_print("⚠️ No active investments!")
        return
    print(f"📈 Active investments for account {account_number}:")
    separator("-")
    for i, inv in enumerate(investments, start=1):
        print(f"{i}. Amount: ₹{inv['amount']:.2f}, Rate: {inv['rate'] * 100:.1f}%, Start Date: {inv['start_time']}")
    separator("-")

# Main Menu
def main_menu():
    data = load_data()
    while True:
        fancy_header("BANK MANAGEMENT SYSTEM")
        print("1️ Create Account")
        print("2️ View Account")
        print("3️ Deposit Money")
        print("4️ Withdraw Money")
        print("5️ Invest Money")
        print("6️ View Investments")
        print("7️ Exit")
        separator()
        choice = input("Enter your choice: ").strip()
        if choice == '1':
            create_account(data)
        elif choice == '2':
            view_account(data)
        elif choice == '3':
            deposit_money(data)
        elif choice == '4':
            withdraw_money(data)
        elif choice == '5':
            invest_money(data)
        elif choice == '6':
            view_investments(data)
        elif choice == '7':
            slow_print("Thank you for using the HA Bank Management System! Goodbye!")
            break
        else:
            slow_print("⚠️ Error: Invalid choice, please try again!")
        pause()
if __name__ == "__main__":
    main_menu