Enhanced Bank Account Management System

# Enhanced Bank Account Management System

# 🏦 Data Structures to Store Information
account_holders = []  # Account names
balances = []         # Account balances
transaction_histories = []  # Account transaction logs
loans = []            # Account loan details

MAX_LOAN_AMOUNT = 10000
INTEREST_RATE = 0.03
def display_menu():
    """Main menu for banking system."""
    print("\n🌟 Welcome to Enhanced Bank System 🌟")
    print("1️⃣ Create Account")
    print("2️⃣ Deposit Money")
    print("3️⃣ Withdraw Money")
    print("4️⃣ Check Balance")
    print("5️⃣ List All Accounts")
    print("6️⃣ Transfer Funds")
    print("7️⃣ View Transaction History")
    print("8️⃣ Apply for Loan")
    print("9️⃣ Repay Loan")
    print("🔟 Identify Credit Card Type")
    print("0️⃣ Exit")

def create_account():
    # TODO: Add logic
    """Create a new account."""
    counter = -1
    users_name = input("Please import your Username: ")
    account_holders.append(users_name)
    balances.append(0)
    loans.append(0)
    for i in balances:
        counter += 1
    print(f"This is your special number you need for further operations:  {counter}")
    print(account_holders)
    print(loans)
    print(balances)


def deposit():
    account_balance = 0
    """Deposit money into an account."""
    user_name = input("Please import your username: ")
    special_num = int(input("Please import your special number: "))
    if user_name in account_holders:
        amount = int(input("Please write amount of money: "))
        balances[special_num] += amount
    else:
        print("Incorrect username or special num!")
    print(f"Balance: {balances[special_num]}")

def withdraw():
    """Withdraw money from an account."""
    # TODO: Add logic
    user_name = input("Please import your username: ")
    special_num = int(input("Please import your special number: "))
    if user_name in account_holders:
        amount = int(input("Please write amount of money: "))
        balances[special_num] -= amount
    else:
        print("Incorrect username or special num!")
    print(f"Balance: {balances[special_num]}")

def check_balance():
    """Check balance of an account."""
      # TODO: Add logic
    username = input("To check your balance please import your username: ")
    special_num = int(input("Please import your special number: "))
    if username in account_holders:
        print(f"Balance: {balances[special_num]}")
    else:
        print("Incorrect username or special num!")

def list_accounts():
    """List all account holders and details."""
    # TODO: Add logic
    print(f"Account holders: {account_holders}")
    print(f"Account balances: {balances}")
    print(f"Loans: {loans}")

def transfer_funds():
    """Transfer funds between two accounts."""
    # TODO: Add logic
    senders_username = input("Please import your username: ")
    senders_special_num = int(input("Please import your special num: "))
    receivers_username = input("Please import receivers username: ")
    receivers_special_num = int(input("Please import receivers special num: "))
    amount = 0
    if senders_username in account_holders and receivers_username in account_holders:
        amount = int(input("Please import the amount you want to transfer: "))
        if amount > balances[senders_special_num]:
            print("Non-sufficient funds!")

        else:
            balances[senders_special_num] -= amount
            balances[receivers_special_num] += amount
    else:
        print("Incorrect username or special num!")
    operation = f"Sender: {senders_username} -> Receiver: {receivers_username} Amount: {amount}"
    transaction_histories.append(operation)
    print(balances)
def view_transaction_history():
    """View transactions for an account."""
    # TODO: Add logic
    print(transaction_histories)


def apply_for_loan():
    """Allow user to apply for a loan."""
    # TODO: Add logic
    username = input("Please import your username: ")
    special_num = int(input("Please import your special num: "))
    if username in account_holders:
        loan_amount = int(input("How much would you like to be loaned? Keep in mind that the maximum amount that we can provide is 10000: "))
        if loan_amount > MAX_LOAN_AMOUNT:
            print("Sorry, but your loan is not approved")
        else:
            years = int(input("In how many years would you like to pay it back: "))  # years of the loan
            print("Perfect the money is in your balance!")
            balances[special_num] += loan_amount
            interest = loan_amount * INTEREST_RATE * years
            loans[special_num] += interest + loan_amount
    else:
        print("Incorrect username or special num!")


def repay_loan():
    """Allow user to repay a loan."""
    # TODO: Add logic
    username = input("Please import your username: ")
    special_num = int(input("Please import your special num: "))
    if username in account_holders:
        amount = int(input("How much would you like to pay: "))
        balances[special_num] -= amount
        loans[special_num] -= amount
        print(f"Your loan balance is: {loans[special_num]}")
    else:
        print("Incorrect username or special num!")

def identify_card_type():
    """Identify type of credit card."""
    # TODO: Add logic
    card_number = int(input("Please import your card number: "))
    card_num_as_str = str(card_number)
    card_type = ""
    if len(card_num_as_str) == 16:
        for i in range(len(card_num_as_str)):
            if card_num_as_str[0] == "4":
                card_type = "Visa"
            elif card_num_as_str[0] == "2" or card_num_as_str[0] == "5":
                card_type = "Mastercard"
            elif card_num_as_str[0] == "3":
                card_type = "American Express"
    else:
        print("Invalid card number!")
    print(f"Card type: {card_type}")
def main():
    """Run the banking system."""
    while True:
        display_menu()
        choice = int(input("Enter your choice: "))
        # Map choices to functions
        if choice == 1:
            create_account()
        elif choice == 2:
            deposit()
        elif choice == 3:
            withdraw()
        elif choice == 4:
            check_balance()
        elif choice == 5:
            list_accounts()
        elif choice == 6:
            transfer_funds()
        elif choice == 7:
            view_transaction_history()
        elif choice == 8:
            apply_for_loan()
        elif choice == 9:
            repay_loan()
        elif choice == 10:
            identify_card_type()
        elif choice == 0:
            print("Goodbye! 👋")
            break
        else:
            print("❌ Invalid choice. Try again!")

if __name__ == "__main__":
    main()