//An instance of this class represents a simple savings account
// Interest is calculated based on the minimum monthly balance
//
package BankAccounts;
public class SavingsAccount extends BankAccount
{
   public static double DEFAULT_INTEREST_RATE = 1.0;
   
   //Instance (State) Variables
   private double interestRate;  //Annual % rate
   private double minimumBalance;//Lowest balance during billing cycle
   
   //Constructor
   // @param initialBalance: initial current balance of this SavingsAccount
   // @param interestRate: annual interest rate (%) of this SavingsAccount
   public SavingsAccount(double initialBalance, double interestRate)
   {
      super(initialBalance);
      this.interestRate = interestRate < DEFAULT_INTEREST_RATE ?
                          DEFAULT_INTEREST_RATE : interestRate ;
      this.minimumBalance = initialBalance;
   }
   
   //Constructor
   // @param initialBalance: initial current balance of this SavingsAccount
   public SavingsAccount(double initialBalance)
   {
      this(initialBalance, DEFAULT_INTEREST_RATE);
   }
   
   //Accessor
   public double getInterestRate()
   {
      return this.interestRate;
   }
   
   //Accessor
   public double getMinimumBalance()
   {
      return this.minimumBalance;
   }
   
   //Override
   public String toString()
   {
      return super.toString() + " Interest Rate: " + this.interestRate + "%/An." 
                              + " Minimum Balance $" + this.minimumBalance ;
   }
   
   //Override
   public boolean equals(Object other)
   {
      if (!super.equals(other))
         return false;
         
      SavingsAccount that = (SavingsAccount)other;
      return this.interestRate == that.interestRate &&
             this.minimumBalance == that.minimumBalance;
   }
   
   //Override
   public void withdraw(double amount)
   {
      super.withdraw(amount);
      if (this.getCurrentBalance() < this.minimumBalance)
         this.minimumBalance = this.getCurrentBalance();
   }
   
   //Mutator
   public void addInterest()
   {
      double interest = this.minimumBalance * this.interestRate / 100 / 12;
      this.credit(interest);
   }
   
   //Mutator
   public void endOfCycleProcessing()
   {
      this.addInterest();
      this.minimumBalance = this.getCurrentBalance();
   }
}