package bank;

/**
 * A bank account object encapsulates the account number, owner name, and
 * current balance of a bank account.
 * This version checks for illegal method and constructor arguments.
 */
public class BankAccount
{
   private int number;
   private String name;
   private double balance;

   /** 
    * Construct a bank account with given account number,
    * owner name and initial balance.
    * @param accountNumber the account number
    * @param ownerName the account owner name
    * @param initialBalance the initial account balance
    * @throws IllegalArgumentException if account number is negative,
    * owner name is null or empty, or if balance is negative.
    */
   public BankAccount(int accountNumber, String ownerName, double initialBalance)
   {
      if (accountNumber <= 0)
         throw new IllegalArgumentException("Account number must be positive");
      if (ownerName.equals("") || ownerName == null)
         throw new IllegalArgumentException("Owner name not defined");
      if (initialBalance < 0)
         throw new IllegalArgumentException("Balance must be non-negative");
      number = accountNumber;
      name = ownerName;
      balance = initialBalance;
   }

   /**
    * Deposit money in the account. 
    * @param amount the deposit amount. If amount <= 0 the
    * account balance is unchanged.
    * @throws IllegalArgumentException if deposit amount is negative
    */
   public void deposit(double amount)
   {
      if (amount < 0)
         throw new IllegalArgumentException("Invalid amount for deposit");
      balance = balance + amount;
   }

   /**
    * Withdraw money from the account.
    * If account would be overdrawn the account balance is unchanged.
    * @param amount the amount to withdraw.
    * @throws IllegalArgumentException if withdraw amount is invalid       
    */
   public void withdraw(double amount)
   {
      if (amount < 0 || amount > balance)
         throw new IllegalArgumentException("Invalid amount for withdraw");
      balance = balance - amount;
   }

   /**
    * Return the account number.
    * @return the account number.
    */
   public int getNumber()
   {
      return number;
   }

   /**
    * Return the owner name.
    * @return the owner name.
    */
   public String getName()
   {
      return name;
   }

   /**
    * Return the account balance.
    * @return the account balance.
    */
   public double getBalance()
   {
      return balance;
   }

   /**
    * string representation of this account.
    * @return string representation of this account.
    */
   public String toString()
   {
       return "BankAccount[" + number + ", " + name + ", " + balance + "]";
   }
}