import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.UIManager;
import javax.swing.Timer;

/**
* @author Dung X. Nguyen
* @author Stephen B. Wong
*/
public class SortControl
{
   public final static int ArraySize = 20;
   public final static int TimeSlice = 100; // in ms.
	private SortGUI _frame = new SortGUI ();
	private IOrdered[] _gcDataArray = makeArray ();
   private ACompareSorter _aCSorter;

   /**
   * Updates the view every 100 ms.  Redraws array graph and redisplays array text.
   */
   private Timer _timer  = new  Timer (TimeSlice, new ActionListener()
      {
         public void actionPerformed(ActionEvent e)
         {
            updateViews ();
         }
      });

	private ILambda _appendCmd = new ILambda ()
   {
      public Object apply (Object x)
      {
          _frame.getOutputTA().append (""+ ((OCInteger)x).getValue()+"\n");
          return x; // returns "whatever"!  Not an issue here.
      }
    };

	class GraphCommand implements ILambda, IDrawable
   {
      private int _minVal = 0;
      private int _maxVal = ArraySize;
      private Graphics _g;
      private int _xIdx;
      private double _m, _b;  // y = _mx + _b.
      private int _minY;
      private int _maxY = ArraySize / 2;

      public void draw(Graphics g)
      {
         _g = g;
         _xIdx = 0;
         _minY = _frame.getGraphCanvas().getHeight() - _maxY;
         _m = ((double)(_maxY - _minY)) / (_maxVal - _minVal);
         _b = ((double)(_minY * _maxVal - _maxY * _minVal)) / (_maxVal - _minVal);
         ArrayMapCar.Singleton.apply (_gcDataArray, this ); // can be done using ILambda anonymous class.
      }

      public Object apply (Object x)
      // expects input x to be an OCInteger.
      {
         int dotSize = 10;
         _g.setColor (((OCInteger) x).getColor());
         _g.fillOval (dotSize * _xIdx++, (int)(_m * ((OCInteger)x).getValue() + _b), dotSize, dotSize);
         return x; // or whatever...
      }
   };

   public SortControl()
   {
      _frame.getGraphCanvas ().setDrawable (new GraphCommand ());
      _aCSorter = CInsertionSorter.Singleton;
      _frame.getInsertionRBtn().setSelected(true);
      _frame.getInsertionRBtn().addActionListener(new ActionListener()
      {
         public void actionPerformed(ActionEvent e)
         {
            _aCSorter = CInsertionSorter.Singleton;
         }
      });

      _frame.getQuickRBtn().addActionListener(new ActionListener()
      {
         public void actionPerformed(ActionEvent e)
         {
            _aCSorter = CQuickSorter.Singleton;
         }
      });

      _frame.getMergeRBtn().addActionListener(new ActionListener()
      {
         public void actionPerformed(ActionEvent e)
         {
            _aCSorter = new CMergeSorter (ArraySize);
         }
      });

      _frame.getSelectionRBtn().addActionListener(new ActionListener()
      {
         public void actionPerformed(ActionEvent e)
         {
            _aCSorter = CSelectionSorter.Singleton;
         }
      });

      _frame.getRandomizeBtn().addActionListener(new ActionListener()
      {
         public void actionPerformed(ActionEvent e)
         {
            randomizeBtn_actionPerformed(e);
         }
      });

      _frame.getSortBtn().addActionListener(new ActionListener()
      {
         public void actionPerformed(ActionEvent e)
         {
            gSortBtn_actionPerformed(e);
         }
      });

      _frame.validate();
      _frame.setVisible(true);
      updateViews ();
   }

   /**
   * Redraws array graph and redisplays array text.
   */
   private final void updateViews ()
   {
      _frame.getOutputTA().setText("");
      ArrayMapCar.Singleton.apply (_gcDataArray, _appendCmd); // can be done using ILambda anynonymous class.
      _frame.getGraphCanvas().repaint();
   }

   /**
   * Runs the selected sorting algorithm in a separate thread.
   */
   private final void gSortBtn_actionPerformed(ActionEvent e)
   {
      setEnabledBtns (false);  // all GUI's buttons are disabled.
      Thread sortThread = new Thread()
         {
            public void run()
            {
               new GraphicSorter (_aCSorter).sort (_gcDataArray, 0, _gcDataArray.length - 1);
               //_aCSorter.sort (_gcDataArray, 0, _gcDataArray.length-1);
               setEnabledBtns (true);  // all GUI's buttons are enabled.
               _timer.stop ();
               updateViews ();
            }
         };
      _timer.start ();
      sortThread.start();
   }

   /**
   * Randomizes the data array.
   */
   private final void randomizeBtn_actionPerformed(ActionEvent e)
   {
      for(int i = 0; i < _gcDataArray.length; i++)
      {
         int x = (int) (_gcDataArray.length * Math.random());
         IOrdered tmp = _gcDataArray[i];
         _gcDataArray[i] = _gcDataArray[x];
         _gcDataArray[x] = tmp;
      }
      updateViews ();
   }

   /**
   * Creates a sorted data array ranging from 0 to ArraySize - 1 with a "middle-of-the-spectrum"
   * RGB color.
   */
   private final IOrdered[] makeArray ()
   {
      int  loColorValue = -16*1024*1024;
      int  hiColorValue =  -1;
      Color normalColor = new SorterColor((loColorValue+hiColorValue)/2, loColorValue, hiColorValue);
      //Color normalColor = new Color((loColorValue + hiColorValue) / 2, false);
      IOrdered[] temp =  new OCInteger[ArraySize];
      for (int i=0; i < temp.length; i++)
      {
         temp [i] = new OCInteger (i, normalColor);
      }
      return temp;
   }

   /**
   * Enables/Disables all GUI's buttons.
   * @param yes true means enable.
   */
   private final void setEnabledBtns (boolean yes)
   {
      _frame.getInsertionRBtn ().setEnabled (yes);
      _frame.getMergeRBtn ().setEnabled (yes);
      _frame.getQuickRBtn ().setEnabled (yes);
      _frame.getQuickRBtn ().setEnabled (yes);
      _frame.getRandomizeBtn ().setEnabled (yes);
      _frame.getSelectionRBtn ().setEnabled (yes);
      _frame.getSortBtn ().setEnabled (yes);
   }

   public static void main(String[] args)
   {
      try
      {
         UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
      }
      catch(Exception e)
      {
      }
      new SortControl();
   }
}