/*=============================================================================#
 # Copyright (c) 2005-2016 Stephan Wahlbrink (WalWare.de) and others.
 # All rights reserved. This program and the accompanying materials
 # are made available under the terms of the Eclipse Public License v1.0
 # which accompanies this distribution, and is available at
 # http://www.eclipse.org/legal/epl-v10.html
 # 
 # Contributors:
 #     Stephan Wahlbrink - initial API and implementation
 #=============================================================================*/

package de.walware.ecommons.ui.dialogs.groups;

import java.util.Arrays;

import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;

import de.walware.ecommons.ui.util.UIAccess;


public class ButtonGroup {

	
	public static interface ButtonListener {
		
		void handleButtonPressed(int buttonIdx);
	}
	
	
	private Composite fComposite;
	
	private Button[] fButtons;
	private final String[] fButtonsLabel;
	private final boolean[] fButtonsEnabled;
	
	private final ButtonListener fListener;
	
	
	public ButtonGroup(final String[] buttonsLabel, final ButtonListener listener) {
		
		fButtonsLabel = buttonsLabel;
		fButtonsEnabled = new boolean[fButtonsLabel.length]; // default disabled
		Arrays.fill(fButtonsEnabled, true);
		
		fListener = listener;
	}

	public void createGroup(final Layouter layouter) {

		fComposite = layouter.composite;
		
		final SelectionListener listener = new SelectionListener() {
			
			@Override
			public void widgetDefaultSelected(final SelectionEvent e) {
				doButtonSelected(e);
			}
			@Override
			public void widgetSelected(final SelectionEvent e) {
				doButtonSelected(e);
			}
		};
		
		fButtons = new Button[fButtonsLabel.length];
		for (int i = 0; i < fButtonsLabel.length; i++) {
			if (fButtonsLabel[i] != null) {
				fButtons[i] = layouter.addButton(fButtonsLabel[i], listener);
				fButtons[i].setEnabled(fButtonsEnabled[i]);
			}
			else {
				layouter.addFiller();
			}
		}
	}
	
	
	public void doButtonSelected(final SelectionEvent event) {
		
		for (int i = 0; i < fButtons.length; i++) {
			if (event.widget == fButtons[i]) {
				fListener.handleButtonPressed(i);
				return;
			}
		}
	}
	
	public void enableButton(final int buttonIdx, final boolean enable) {
		
		fButtonsEnabled[buttonIdx] = enable;
		if (fComposite.isEnabled()) {
			fButtons[buttonIdx].setEnabled(enable);
		}
	}
	
	public void updateButtonStatet() {
		
		if (fButtons == null || !UIAccess.isOkToUse(fComposite)) {
			return;
		}
		
		final boolean global = fComposite.isEnabled();
		for (int i = 0; i < fButtons.length; i++) {
			if (UIAccess.isOkToUse(fButtons[i])) {
				fButtons[i].setEnabled(global && fButtonsEnabled[i]);
			}
		}
	}

	public boolean isButtonEnabled(final int idx) {

		return fButtonsEnabled[idx];
	}
	
}