// Helene Martin, CSE 142
// A bank account object has a balance that can be changed
// by deposits and withdrawals.

// goal: demonstrate importance of encapsulation through 
// private fields.  Show the creation of a class from 
// scratch: design, defining fields, creating the constructor(s), 
// writing the toString, implementing behavior, testing in client.

public class BankAccount {
	private double balance; // in dollars
	private String name; 
	private String id;
	private int transaction;
	
	// Constructs a bank acount with a given balance, name and
	// account ID.
	public BankAccount(double initialBalance, String theName, 
			String theId) {
		balance = initialBalance;
		name = theName;
		id = theId;		
	}
	
	// Constructs a bank account with a zero balance and the given
	// name and account ID.
	public BankAccount(String theName, String theId) {
		this(0, theName, theId);
	}
	
	// Deposits money into the bank account.
	// Fails if amount is negative.
	public void deposit(double amount) {
		if (amount > 0) {
			balance += amount;
			transaction++;
		}
	}
	
	// Winthdraws money from the bank account.
	// Fails if amount is negative or greater than the balance.
	public void withdraw(double amount) {
		if (balance - amount >= 0 && amount > 0) {
			balance -= amount;
			transaction++;
		}
	}
	
	public String toString() {
		return "#" + id + " (" + name + "): $" + balance;
	}
	
	// possible additional state:
	// pin -- in User class?
	// password
	// interest rate
	// date/time
	// list of transactions

	// possible additional behavior:
	// transfer from one account to another
	// calculate interest
	// see transaction history
}