package dbj.odmg;

import java.util.Date;
import java.util.Enumeration;
import COM.POET.odmg.collection.*;

public class BookOrder {
  public final static int OPEN = 1;
  public final static int DELIVERED = 2;
	
  double price_;
  Date date_;
  ListOfObject items_;
  int status_;
  Customer customer_;
	
  public BookOrder () {
    price_ = 0.0;
    date_ = new Date ();
    items_ = new ListOfObject ();
    status_ = OPEN;
    customer_ = null;
  }
	
  public void addItem (Book b, int n) {
    items_.add (new OrderItem (b, n));
  }

  public void setCustomer (Customer cust) {
    customer_ = cust;
  }
	
  public Date getDate () {
    return date_;
  }
	
  public int getStatus () {
    return status_;
  }
	
  public Enumeration getItems () {
    return items_.elements ();
  }
	
  public boolean deliver () {
    Enumeration e;

    e = getItems ();
    while (e.hasMoreElements ()) {
      OrderItem item = (OrderItem) e.nextElement ();
      if (! item.isAvailable ())
	  return false;
    }
    calculatePrice ();
    e = getItems ();
    while (e.hasMoreElements ()) {
      OrderItem item = (OrderItem) e.nextElement ();
      item.book.reduceStock (item.num);
    }
    status_ = DELIVERED;
    return true;
  }
	
  private void calculatePrice () {
    price_ = 0.0;
    Enumeration e = getItems ();
    while (e.hasMoreElements ()) {
      OrderItem item = (OrderItem) e.nextElement ();
      price_ += item.getPrice ();
    }
  }

  public String toString () {
    StringBuffer buf = new StringBuffer ();
    buf.append ("Order from " + date_ + ":\n");

    Enumeration e = getItems ();
    while (e.hasMoreElements ()) {
      OrderItem item = (OrderItem) e.nextElement ();
      buf.append (item.num + " " + item.book);
    }
    buf.append ("price = " + price_ + "\n");

    return buf.toString ();
  }
}