Auction

/**
 * Auction class merupakan class utama berisi sistem lelang.
 *
 * @author Daffa Amanullah Setyawan
 * @version 0.1 24 Oktober 2020
 */

import java.util.ArrayList;

 public class Auction
 {
   // Daftar Lots untuk auction
   private ArrayList<Lot> lots;
   // Nomor yang diberikan to the next lot entered
   private int nextLotNumber;

   /**
    * Membuat a new auction
    */
   public Auction()
   {
     lots = new ArrayList<Lot>();
     nextLotNumber = 1;
   }

   /**
    * Memasukkan a new lot ke dalam auction
    * @parameter description Sebuah deskripsi dari lot
    */
   public void enterLot(String description)
   {
     lots.add(new Lot(nextLotNumber, description));
     nextLotNumber++;
   }

   /**
    * Menampilkan daftar lengkap dari Lots in this auction
    */
   public void showLots()
   {
     for(Lot lot : lots)
     {
       System.out.println(lot.toString());
     }
   }

   /**
    * Make a bid untuk sebuah lot
    * Sebuah pesan dicetak mengindikasikan apakah bidding
    * berhasil atau tidak.
    * @parameter lotNumber The lot being bid for.
    * @parameter bidder The person yang melakukan bid untuk lot.
    * @parameter value Jumlah nilai dari bid.
    */
   public void makeABid(int lotNumber, Person bidder, long value)
   {
     Lot selectedLot = getLot(lotNumber);
     if (selectedLot != null)
     {
       boolean succesful = selectedLot.bidFor(new Bid(bidder, value));
       if (succesful)
       {
         System.out.println("The bid for lot number " +
                            lotNumber + " was succesful.\n");
       }
       else
       {
         // Melaporkan bid mana yang lebih besar.
         Bid highestBid = selectedLot.getHighestBid();
         System.out.println("Lot number: " + lotNumber +
                            " already has a bid of: " +
                            highestBid.getValue() + "\n");
       }
     }
   }

   /**
    * Return the lot dengan nomor yang diberikan. Return null
    * jika sebuah lot dengan nomor yang dimaksud tidak ada.
    * @parameter lotNumber The number of the lot to return.
    */
   public Lot getLot(int lotNumber)
   {
     if((lotNumber >= 1) && (lotNumber < nextLotNumber))
     {
       //The number seems to be reasonable
       Lot selectedLot = lots.get(lotNumber-1);

       // Menyocokkan supaya meyakinkan apakah sudah mendapat lot yang benar
       if (selectedLot.getNumber() != lotNumber)
       {
         System.out.println("Internal error: Lot number " +
                            selectedLot.getNumber() +
                            " was returned instead of " + lotNumber);
         selectedLot = null;
       }
       return selectedLot;
     }
     else
     {
       System.out.println("Lot number: " + lotNumber + " does not exist.");
       return null;
     }
   }

   /**
    * Menutup auction.
    * Mengumumkan hasil lelang tiap Lots
    */
   public void close()
   {
     System.out.println("Closing auction.\n");
     for (Lot lot : lots)
     {
       System.out.println(lot.getNumber() + ": " + lot.getDescription());
       if (lot.getHighestBid() == null)
       {
         System.out.println (" (No bids) ");
       }
       else
       {
         Bid highestBid = lot.getHighestBid();
         System.out.println(" sold to " +
                            highestBid.getBidder().getName() +
                            " for " + highestBid.getValue());
       }
     }
   }
 }