package org.hwo.bitfields.ui;

import javax.swing.JPanel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import java.awt.FlowLayout;
import java.util.LinkedList;
import java.util.List;

import javax.swing.BoxLayout;
import javax.swing.JLabel;

import org.hwo.bitfields.BitField;
import org.hwo.bitfields.Field;

public class BitFieldEditor extends JPanel implements ChangeListener {
	private BitField	bitField;
	private FieldControl[]	controls;
	
	private List<ChangeListener> changeListeners;
	
	public BitFieldEditor() {
		setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
		this.changeListeners = new LinkedList<ChangeListener>();
	}
	
	public void addChangeListener(ChangeListener listener){
		this.changeListeners.add(listener);
	}
	public void removeChangeListener(ChangeListener listener){
		this.changeListeners.remove(listener);
	}

	public void fireStateChanged(){
		ChangeEvent ce = new ChangeEvent(this);
		for (ChangeListener listener: this.changeListeners){
			listener.stateChanged(ce);
		}
	}
	
	public Integer getIntValue() {
		int value = 0;
		for (FieldControl fc:controls)
		{
			value = fc.getValue(value);
		}
		return value;
	}

	public void setIntValue(Integer intValue) {
		for (FieldControl fc:controls)
		{
			fc.setValue(intValue);
		}
		
	}
	
	@Override
	public void stateChanged(ChangeEvent e) {
		fireStateChanged();
	}
	

	public BitField getBitField() {
		return bitField;
	}

	public void setBitField(BitField bitField) {
		if (this.bitField != null){
			this.bitField.removeChangeListener(this);
		}
		
		this.bitField = bitField;

		if (this.bitField != null){
			this.bitField.addChangeListener(this);
		}

		
		initializeView();
	}
	
	
	private void initializeView()
	{
		if (controls != null)
		{
			for (FieldControl fc: controls)
			{
				remove(fc.getEditorComponent());
			}
		}
		Field[] fields = bitField.getFields();
		controls = new FieldControl[fields.length];
		
		for (int i=0;i<fields.length;i++)
		{
			if (fields[i].getLength() == 1)
				controls[i] = new BoolFieldEditor(fields[i]);
			else
				controls[i] = new IntFieldEditor(fields[i]);
			
			add(controls[i].getEditorComponent());
		}
	}
	
	@Override
	public boolean requestFocusInWindow() {
		if ((controls != null) && controls.length != 0)
		{
			return controls[0].requestFocusInWindow();
		}
		return false;
	}
	
}