package com.algomagic.atn;

import java.util.*;
import javax.swing.*;

public class PlayBackController 
    extends Observable 
    implements Observer, VisualizationConstants 

{
    private int _delay;
    private boolean _loop;
    private List _updates;
    private int _index = 0;
    private boolean _clear = true;
    private boolean _playing = false;

    public PlayBackController( List updates, Properties properties ) {
	_delay = Integer.parseInt( properties.getProperty( DELAY_PROP, DELAY_DEFAULT ) );
	_loop = (new Boolean( properties.getProperty( LOOP_PROP, LOOP_DEFAULT ) )).booleanValue( );
	_updates = updates;
    }

    public void update( Observable o, Object arg ) {
	if( arg instanceof String ) {
	    String cmd = (String)arg;

	    if( cmd.equals( "play" ) ) {
		_playing = true;
		new Thread( new PlayThread( ) ).start( );
	    } else if( cmd.equals( "pause" ) ) {
		_playing = false;
	    } else if( cmd.equals( "stepf" ) ) {
		stepf( );
	    } else if( cmd.equals( "stepb" ) ) {
		stepb( );
	    } else if( cmd.equals( "ff" ) ) {
		ff( );
	    } else if( cmd.equals( "rewind" ) ) {
		rewind( );
	    }

	} else if( arg instanceof JSpinner ) {
	    SpinnerNumberModel snm = (SpinnerNumberModel)((JSpinner)arg).getModel( );
	    _delay = snm.getNumber( ).intValue( );
	} else if (arg instanceof Boolean ) {
	    _loop = ((Boolean)arg).booleanValue( );
	}
    }


    public int getIndex( ) {
	return _index;
    }


    private synchronized void stepf( ) {
	if( _index == _updates.size( ) ) {
	    _index = 0;
	    if( _playing == true && _loop == false ) {
		_playing = false;
	    }
	}


	if( _index == 0 && _clear == false ) {
	    _clear = true;

	    setChanged( );
	    notifyObservers( "CLEAR" );

	    return;
	}

	_clear = false;

	PanelUpdate u = (PanelUpdate)_updates.get(_index);
	u.setUndo( false );

	setChanged( );
	notifyObservers( u );
	_index++;

    }

    private synchronized void stepb( ) {
// 	System.out.println( "steck back " + _index );
// 	System.out.print( "stepb: " + _index + " " );


	if( _index == 0 ) {
	    ff( );
// 	    System.out.println(  _index );

	    return;
	}
	_index--;

	PanelUpdate u = (PanelUpdate)_updates.get( _index );
	u.setUndo( true );

 	setChanged( );
 	notifyObservers( u );
// 	System.out.println(  _index );
	
	if( _index == 0 ) {
	    _clear = true;
	}

    }
	
    private synchronized void ff( ) {
	int i;


// 	System.out.print( "ff: " + _index + " " );

	for( i=_index; i < _updates.size( ); i++ ) {
	    setChanged( );
	    PanelUpdate u = (PanelUpdate)_updates.get(i);
	    u.setUndo( false );

	    _index=i;
	    notifyObservers( u );
	    
// 	    System.out.println( "here" );

	}

	_clear = false;
	_index=i;

// 	System.out.println(  _index );
    }


    private synchronized void rewind( ) {
	_index = 0;
	_clear = true;
	
	setChanged( );
	notifyObservers( "CLEAR" );
    }


    private class PlayThread implements Runnable {
	public void run( ) {
	    while( _playing ) {
		try {
		    stepf( );
		    Thread.currentThread( ).sleep( _delay );
		} catch( InterruptedException ie ) {
		    throw new RuntimeException( ie );
		}
	    }
		
	}
    }

}