package visualisation;

import logging.Algorithm;
import logging.LogElement;
import logging.LogElementList;

import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

/**
 * This is the central class for using packages logging and visualization. 
 * It contains each an area for graphical and textual output of an algorithm step and an area for parameter input. 
 * Use it in an application or as an applet. 
 * If you use it as an applet you will have to extend it by a standard constructor that creates your applet. 
 * @see logging.Algorithm
 * @see LogElement
 * @see LogElementList
 * @see DrawArea
 * @see ParameterArea
 * @see TextArea
 * @see LegendArea
 * @see JApplet
 * @author Bj�rn Strobel<br><small>
 * University of Cooperative Education Stuttgart, 
 * Campus Horb<br>
 * Department of Information Technology<br>
 * it2003<br></small>
 */
public class HybridWindow<
    DRAW extends DrawArea,
    TEXT extends TextArea,
    PARAM extends ParameterArea,
    ALGORITHM extends Algorithm,
    LOG extends LogElement,
    LEGEND extends LegendArea
>
extends JApplet{
	
	/** Constant representing state of parameter input. */
	final protected byte PARAMETERSTATE=0;
	/** Constant representing state of activated algorithm. */
	final protected byte RUNSTATE=1;
	/** Constant representing state of automatic stepping. */
	final protected byte AUTOSTATE=2;
	
	/** Represents the current state of this application. */
	protected byte state;

	/**	The window's draw area for graphical output of an algorithm step.*/
	protected DRAW drawArea;
	/** The window's text area for textual output of an algorithm step.*/
	protected TEXT textArea;
	/** The window's parameter area for parameter input of an algorithm. */
	protected PARAM parameterArea;
	/** The presented algorithm. */
	protected ALGORITHM algorithm;
	/** Log element list containing the algorithm's single step's log elements. */
	protected LogElementList<LOG>logList;
	/** The window's legend area for describing the parameters of an algorithm's graphical output. */
	protected LEGEND legendArea;
	
	/** The hybrid window's tabbed pane containing the draw area. */
	protected JTabbedPane tabbedPane;
	/** The window's start button. Triggers algorithm processing.*/
	protected JButton startButton;
	/** The window's stop button. Clears the window for a new parametric input. */
	protected JButton stopButton;
	/** The window's next button. Proceeds to next log element. */
	protected JButton nextButton;
	/** The window's previous button. Proceeds to previous log element. */
	protected JButton prevButton;
	/** The window's last button. Proceeds to last log element. */
	protected JButton lastButton;
	/** The window's first button. Proceeds to first log element. */
	protected JButton firstButton;
	/** The window's toggle button for automatic proceeding. Enables/Disables automatic step processing. */
	protected JToggleButton autoButton;
	/** The window's toggle button for pausing automatic proceeding. */
	protected JButton pauseButton;
	/** The window's delay slider for automatic proceeding. Adjusts the interval of auto stepping. */
	protected JSlider autoSlider;
	/** The window's radio button for forward direction at auto stepping. */ 
	protected JRadioButton autoForwardButton;
	/** The window's radio button for backward direction at auto stepping. */ 
	protected JRadioButton autoBackwardButton;
	
	/** Action listener for start button. */
	protected StartListener startListener;
	/** Action listener for stop button. */
	protected StopListener stopListener;
	/** Action listener for previous button. */
	protected PrevListener prevListener;
	/** Action listener for next button. */
	protected NextListener nextListener;
	/** Action listener for first button. */
	protected FirstListener firstListener;
	/** Action listener for last button. */
	protected LastListener lastListener;
	/** Item listener for auto button. */
	protected AutoButtonListener autoButtonListener;
	/** Change listener for auto slider. */
	protected AutoSliderListener autoSliderListener;
	/** Item listener for forward button. */
	protected AutoForwardListener autoForwardListener;
	/** Item listener for backward button. */
	protected AutoBackwardListener autoBackwardListener;
	/** Item listener for pause button. */
	protected PauseButtonListener pauseButtonListener;
	
	/** Timer for auto stepping. */
	protected Timer autoTimer;
	
	/**
	 * Standard constructor.
	 */
	public HybridWindow() {
		tabbedPane=new JTabbedPane();
	}
	
	/**
	 * Extended constructor. Types of drawArea, textArea, parameterArea, algorithm and logList are determined here.
	 * @param drawArea the window's draw area. It must extend visualization.DrawArea.
	 * @param textArea the window's text area. It must extend visualization.TextArea.
	 * @param parameterArea the window's parameter area. It must extend visualization.ParameterArea.
	 * @param algorithm the window's algorithm. It must extend logging.Algorithm.
	 * @param logList the window's log list. Elements must extend logging.LogElement.
	 * @param legendArea the window's legend area. Must be a subclass of visualization.LegendArea
	 */
	public HybridWindow(DRAW drawArea, TEXT textArea, PARAM parameterArea, ALGORITHM algorithm, LogElementList<LOG>logList, LEGEND legendArea) {
		this.drawArea=drawArea;
		this.textArea=textArea;
		this.parameterArea=parameterArea;
		this.algorithm=algorithm;
		this.logList=logList;
		this.legendArea=legendArea;
		tabbedPane=new JTabbedPane();
	}
	
	/**
	 * Applet's initial phase.
	 * In case of use as an application call it explicitely.
	 * Sets up the GUI and the action listeners.
	 */
	public void init(){
		startButton=new JButton("start");
		stopButton=new JButton("stop");
		nextButton=new JButton("next");
		prevButton=new JButton("prev");
		lastButton=new JButton("last");
		firstButton=new JButton("first");
		autoButton=new JToggleButton("automatc");
		autoSlider=new JSlider(1,100,1);
		autoForwardButton=new JRadioButton("forward");
		autoBackwardButton=new JRadioButton("backward");
		pauseButton=new JButton("pause");
		
		ButtonGroup autoDirection=new ButtonGroup();
		autoDirection.add(autoForwardButton);
		autoDirection.add(autoBackwardButton);
		autoForwardButton.setSelected(true);
	
		JPanel panelStartStopControls=new JPanel();
		panelStartStopControls.setLayout(new GridLayout(4,1,5,5));
		panelStartStopControls.add(startButton);
		panelStartStopControls.add(stopButton);
		panelStartStopControls.add(pauseButton);
		panelStartStopControls.setBorder(BorderFactory.createTitledBorder("Start / Stop"));
	
		JPanel panelStepwiseExecutionControls=new JPanel();
		panelStepwiseExecutionControls.setLayout(new GridLayout(4,1,5,5));
		panelStepwiseExecutionControls.add(firstButton);
		panelStepwiseExecutionControls.add(nextButton);
		panelStepwiseExecutionControls.add(prevButton);
		panelStepwiseExecutionControls.add(lastButton);
		panelStepwiseExecutionControls.setBorder(BorderFactory.createTitledBorder("Stepwise execution"));
	
		JPanel panelAutomaticExecutionControls=new JPanel();
		panelAutomaticExecutionControls.setLayout(new GridLayout(5,1,5,5));
		panelAutomaticExecutionControls.add(autoButton);
		panelAutomaticExecutionControls.add(autoSlider);
		panelAutomaticExecutionControls.add(autoForwardButton);
		panelAutomaticExecutionControls.add(autoBackwardButton);
		panelAutomaticExecutionControls.setBorder(BorderFactory.createTitledBorder("Automatic execution"));
		
		JPanel buttonLine=new JPanel();
		buttonLine.setLayout(new GridLayout(3,1,5,5));
		buttonLine.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
		buttonLine.add(panelStartStopControls);
		buttonLine.add(panelStepwiseExecutionControls);
		buttonLine.add(panelAutomaticExecutionControls);

		JLabel headline=new JLabel(algorithm.getTitle());
		headline.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
		headline.setFont(new Font("SansSerif",Font.PLAIN,20));
		
		JScrollPane parameterAreaScrollPane = parameterArea.getScrollPane();
        JScrollPane legendAreaScrollPane = legendArea.getScrollPane();
        
        parameterAreaScrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        legendAreaScrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

        JSplitPane hybridWindowSplitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,parameterAreaScrollPane, legendAreaScrollPane);      
        hybridWindowSplitPane.setOneTouchExpandable(true);
        hybridWindowSplitPane.setResizeWeight(0.465);     
        tabbedPane.insertTab(drawArea.getDrawAreaName(),null, drawArea.getScrollPane(),drawArea.getDrawAreaName(),0);
        tabbedPane.setSelectedIndex(0);
				
		setLayout(new BorderLayout(10,10));
		
		add(headline,BorderLayout.NORTH);
		add(hybridWindowSplitPane,BorderLayout.WEST);
		add(tabbedPane,BorderLayout.CENTER);
		add(textArea.getScrollPane(),BorderLayout.SOUTH);
		add(buttonLine,BorderLayout.EAST);
		
		setState(PARAMETERSTATE);
		
		startListener=new StartListener();
		stopListener=new StopListener();
		prevListener=new PrevListener();
		nextListener=new NextListener();
		firstListener=new FirstListener();
		lastListener=new LastListener();
		autoButtonListener=new AutoButtonListener();
		autoSliderListener=new AutoSliderListener();
		autoForwardListener=new AutoForwardListener();
		autoBackwardListener=new AutoBackwardListener();
		pauseButtonListener=new PauseButtonListener();
		
		startButton.addActionListener(startListener);
		stopButton.addActionListener(stopListener);
		prevButton.addActionListener(prevListener);
		nextButton.addActionListener(nextListener);
		firstButton.addActionListener(firstListener);
		lastButton.addActionListener(lastListener);
		autoButton.addItemListener(autoButtonListener);
		autoSlider.addChangeListener(autoSliderListener);
		autoForwardButton.addItemListener(autoForwardListener);
		autoBackwardButton.addItemListener(autoBackwardListener);
		pauseButton.addActionListener(pauseButtonListener);
		
		autoTimer=new Timer(1,nextListener);
	}
	
	/**
	 * Sets the window's state and enables/disables the corresponding components.
	 * @param state
	 */
	final protected void setState(int state){
		Component[]components=parameterArea.getComponents();
		
		switch(state){
		
			case PARAMETERSTATE:
				state=PARAMETERSTATE;
				for(Component c:components){
					c.setEnabled(true);
				}
				startButton.setEnabled(true);
				stopButton.setEnabled(false);
				nextButton.setEnabled(false);
				prevButton.setEnabled(false);
				lastButton.setEnabled(false);
				firstButton.setEnabled(false);
				autoButton.setEnabled(false);
				autoSlider.setEnabled(false);
				autoForwardButton.setEnabled(false);
				autoBackwardButton.setEnabled(false);
				pauseButton.setEnabled(false);
				break;
				
			case RUNSTATE:
				state=RUNSTATE;
				for(Component c:components){
					c.setEnabled(false);
				}
				startButton.setEnabled(false);
				stopButton.setEnabled(true);
				nextButton.setEnabled(true);
				prevButton.setEnabled(true);
				lastButton.setEnabled(true);
				firstButton.setEnabled(true);
				autoButton.setEnabled(true);
				autoSlider.setEnabled(true);
				autoForwardButton.setEnabled(true);
				autoBackwardButton.setEnabled(true);
				pauseButton.setEnabled(false);
				break;
				
			case AUTOSTATE:
				state=AUTOSTATE;
				for(Component c:components){
					c.setEnabled(false);
				}
				startButton.setEnabled(false);
				stopButton.setEnabled(false);
				nextButton.setEnabled(false);
				prevButton.setEnabled(false);
				lastButton.setEnabled(false);
				firstButton.setEnabled(false);
				autoButton.setEnabled(true);
				autoSlider.setEnabled(true);
				autoForwardButton.setEnabled(true);
				autoBackwardButton.setEnabled(true);
				pauseButton.setEnabled(true);
				break;
		}
	}
	
	/**
	 * Returns the window's current state.
	 * @return the window's current state
	 */
	final protected byte getState(){
		return state;
	}
	
	/**
	 * Method for adding a new component to the hybrid window's tabbed pane
	 * @param title the title of the new tab
	 * @param component the component to be added to the tabbed pane
	 */
	final public void addNewComponent(String title,Component component){
		tabbedPane.addTab(title,component);
	}
	
	/**
	 * Method for adding a new component to the hybrid window's tabbed pane
	 * @param title the title of the new tab
	 * @param icon the icon to be displayed on the new tab
	 * @param component the component to be added to the tabbed pane
	 */
	final public void addNewComponentWithIcon(String title,Icon icon,Component component){
		tabbedPane.addTab(title,icon,component);
	}
			
	class StartListener implements ActionListener{
		public void actionPerformed(ActionEvent event){
			setState(RUNSTATE);
			logList=algorithm.run();
			drawArea.setLogList(logList);
			textArea.setLogList(logList);
		}
	}
	
	class StopListener implements ActionListener{
		public void actionPerformed(ActionEvent event){
			setState(PARAMETERSTATE);
			logList.clear();
			drawArea.clear();
			textArea.clear();
		}
	}

	class PrevListener implements ActionListener{
		public void actionPerformed(ActionEvent event){
			if(logList.isInitialized()){
				if(logList.get()==logList.firstElement()){
					autoButton.setSelected(false);
				}
				else{
					logList.prev();
					drawArea.drawStep();
					textArea.printStep();
				}
			}
			else{
				logList.prev();
				drawArea.drawStep();
				textArea.printStep();
			}
		}
	}
	
	class NextListener implements ActionListener{
		public void actionPerformed(ActionEvent event){
			if(logList.isInitialized()){
				if(logList.get()==logList.lastElement()){
					autoButton.setSelected(false);
				}
				else{
					logList.next();
					drawArea.drawStep();
					textArea.printStep();
				}
			}
			else{
				logList.next();
				drawArea.drawStep();
				textArea.printStep();
			}
		}
	}
	
	class FirstListener implements ActionListener{
		public void actionPerformed(ActionEvent event){
			logList.first();
			drawArea.drawStep();
			textArea.printStep();
		}
	}
	
	class LastListener implements ActionListener{
		public void actionPerformed(ActionEvent event){
			logList.last();
			drawArea.drawStep();
			textArea.printStep();
		}
	}

	class AutoButtonListener implements ItemListener{
		public void itemStateChanged(ItemEvent event){
			if(event.getStateChange()==ItemEvent.SELECTED){
				setState(AUTOSTATE);
				autoTimer.setDelay(10000/((int)Math.pow(autoSlider.getValue(),2)));
				autoTimer.start();
			}else{
				setState(RUNSTATE);
				autoTimer.stop();
			}
		}
	}
	
	class AutoSliderListener implements ChangeListener{
		public void stateChanged(ChangeEvent event){
			if(autoTimer.isRunning()){
				autoTimer.stop();
				autoTimer.setInitialDelay(10000/((int)Math.pow(autoSlider.getValue(),2)));
				autoTimer.setDelay(10000/((int)Math.pow(autoSlider.getValue(),2)));
				autoTimer.start();
				autoTimer.setInitialDelay(1);
			}
		}
	}
	
	class AutoForwardListener implements ItemListener{
		public void itemStateChanged(ItemEvent event){
			if(event.getStateChange()==ItemEvent.SELECTED){
				autoTimer.removeActionListener(prevListener);
				autoTimer.addActionListener(nextListener);
			}
		}
	}

	class AutoBackwardListener implements ItemListener{
		public void itemStateChanged(ItemEvent event){
			if(event.getStateChange()==ItemEvent.SELECTED){
				autoTimer.removeActionListener(nextListener);
				autoTimer.addActionListener(prevListener);
			}
		}
	}
	
	class PauseButtonListener implements ActionListener{
		public void actionPerformed(ActionEvent event){
			if(autoButton.isSelected()){
				setState(RUNSTATE);
				autoTimer.stop();
				autoButton.setSelected(false);
			}
		}
	}
}