/**
* A bank account representation class.
* DISCLAIMER: This code is for class illustration purposes and therefore
* it is not written according to the course's style guidelines.

*/

public class BankAccount {

  // Account numbers are allocated from 1 onward.
  private static int nextAccountNumber = 1;
  // Money in the bank
  private static int bankDeposits = 0;
  // Commission rate that the bank charges
  private static final double COMMISSION_RATE = 0.005;
  // Commission step above which the commission halves
  private static final int COMMISSION_STEP = 5000;

  // Fields
  private int number;     // Generated
  private String owner;   // Supplied when an account is opened
  private double balance;    // Supplied when an account is opened

  //  Sets up a new account
  public BankAccount (String owner, double balance) {
    this.number = nextAccountNumber++;
    this.owner = owner;
    this.balance = balance;
  }

  // Handles a deposit
  public void deposit (double amount) {
    double charge = commission(amount);
    balance = balance + amount - charge;
    bankDeposits += amount;
  }

  // Handles a withdrawl
  public void withdraw (double amount) {
    double charge = commission(amount);
    balance = balance - amount - charge;
    bankDeposits -= amount;
  }

  // Handles a transfer
  public void transferTo(double amount, BankAccount targetAccount) {
    targetAccount.deposit(amount);
    this.withdraw(amount);
  }

  // Returns the balance
  public double getBalance () {
    return balance;
  }

  // Returns the commission that the bank charges for the amount  
  private static double commission (double amount) {
    return ((amount > COMMISSION_STEP) ? 
              (amount * COMMISSION_RATE / 2) :
              (amount * COMMISSION_RATE));
  }

  // Accessors and mutators: in practice we will typically have one 
  // accessor and one mutator for each field, here we have only two:
  public int getNumber() {
    return number;
  }

  public void setNumber(int number) {
    this.number = number;
  }

  // Returns a textual object description
  public String toString () {
    return (number + "\t" + owner + "\t" + (int) balance);
  }

  // Compares this object to another given object
  public boolean equals(BankAccount other) {
    if (other == null) {
      return false;
    }
    // Two bank accounts are equal if their account number is the same    
    return (this.number == other.getNumber());
  }
	
  // Returns a copy of this object
  public BankAccount clone() {
    BankAccount copy = 
new BankAccount(this.owner,
this.balance);
    copy.setNumber(this.number);
    nextAccountNumber--;  // restore the account numbetr "wasted" by the cloning
    return copy;
  }
}