/**
 * SavingsAccount.java
 */
public class SavingsAccount {
    private int accountNumber;
    private String firstName;
    private String lastName;
    private double savingsBalance;
    private static double annualInterestRate;

    public SavingsAccount(int accountNumber, String firstName, String lastName, double savingsBalance)
    {
        this.setAccountNumber(accountNumber);
        this.setFirstName(firstName);
        this.setLastName(lastName);

        if(savingsBalance >= 0)
            this.setSavingsBalance(savingsBalance);
        else
            this.setSavingsBalance(0);
    }

    /**
     * @param amt the amount to add to the current balance
     */
    public void deposit(double amt)
    {
        if(amt > 0)
            savingsBalance += amt;
    }

    /**
     * @param amt the amount to withdraw
     */
    public void withdraw(double amt)
    {
        if(amt < savingsBalance)
            savingsBalance -= amt;
    }

    /**
     *
     */
    public void calculateMonthlyInterest()
    {
        double amt = savingsBalance * (annualInterestRate / 12);

        savingsBalance += amt;
    }

    /**
     * @param rate the new interest rate
     */
    public static void modifiyInterestRate(double rate)
    {
        annualInterestRate = rate;
    }

    /**
     * @return a string representation of the current state of the class
     */
    public String toString()
    {
        /* round the value first to ensure 2 decimal places */
        savingsBalance = (double) Math.round(savingsBalance * 100) / 100;

        String result = "";

        result += "Name: " + firstName + " " + lastName + "\n";
        result += "Account Number: " + accountNumber + "\n";
        result += "Balance: $" + savingsBalance + "\n";

        return result;
    }

    /**
     * @return the accountNumber
     */
    public int getAccountNumber() {
        return accountNumber;
    }

    /**
     * @param accountNumber the accountNumber to set
     */
    public void setAccountNumber(int accountNumber) {
        this.accountNumber = accountNumber;
    }

    /**
     * @return the firstName
     */
    public String getFirstName() {
        return firstName;
    }

    /**
     * @param firstName the firstName to set
     */
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    /**
     * @return the lastName
     */
    public String getLastName() {
        return lastName;
    }

    /**
     * @param lastName the lastName to set
     */
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    /**
     * @return the savingsBalance
     */
    public double getSavingsBalance() {
        return savingsBalance;
    }

    /**
     * @param savingsBalance the savingsBalance to set
     */
    public void setSavingsBalance(double savingsBalance) {
        this.savingsBalance = savingsBalance;
    }

}