/*
 * Copyright (c) 2003-2004 Christopher Lenz and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     Christopher Lenz - initial API and implementation
 * 
 * $Id: CssPreferencePage.java,v 1.1 2004-09-02 18:11:50 jsurfer Exp $
 */

package net.sourceforge.phpeclipse.css.ui.internal.preferences;

import java.util.Arrays;
import java.util.Comparator;

import net.sourceforge.phpeclipse.css.core.CssCore;
import net.sourceforge.phpeclipse.css.core.internal.CssCorePreferences;
import net.sourceforge.phpeclipse.css.core.profiles.IProfileDescriptor;
import net.sourceforge.phpeclipse.css.core.profiles.IProfileManager;
import net.sourceforge.phpeclipse.css.ui.internal.CssUIMessages;

import org.eclipse.core.runtime.Preferences;
import org.eclipse.jface.preference.PreferencePage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Group;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPreferencePage;

/**
 * 
 */
public class CssPreferencePage extends PreferencePage
	implements IWorkbenchPreferencePage {

	// Instance Variables ------------------------------------------------------

	/**
	 * The CSS core preferences.
	 */
	private Preferences preferences;

	/**
	 * The radio buttons used to select the default profile.
	 */
	private Button[] profileButtons;

	/**
	 * The ID of the currently selected CSS profile.
	 */
	private String selectedProfile;

	// Constructors ------------------------------------------------------------

	/**
	 * Default constructor.
	 */
	public CssPreferencePage() {
		super(getString("description")); //$NON-NLS-1$
		preferences = CssCore.getDefault().getPluginPreferences();
	}

	// PreferencePage Implementation -------------------------------------------

	/* 
	 * @see PreferencePage#createContents(Composite)
	 */
	protected Control createContents(Composite parent) {
		Composite composite = new Composite(parent, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.numColumns = 1;
		composite.setLayout(layout);

		createProfileRadioGroup(composite);

		return composite;
	}

	/* 
	 * @see PreferencePage#performDefaults()
	 */
	protected void performDefaults() {
		preferences.setToDefault(CssCorePreferences.PROFILE);
		selectedProfile = preferences.getString(CssCorePreferences.PROFILE);
		if (selectedProfile != null) {
			for (int i = 0; i < profileButtons.length; i++) {
				Button button = profileButtons[i];
				if (((String) button.getData()).equals(selectedProfile)) {
					button.setSelection(true);
				} else {
					button.setSelection(false);
				}
			}
		}
	}

	/* 
	 * @see PreferencePage#performOk()
	 */
	public boolean performOk() {
		preferences.setValue(CssCorePreferences.PROFILE, selectedProfile);
		return super.performOk();
	}

	// IWorkbenchPreferencePage Implementation ---------------------------------

	/**
	 * @see IWorkbenchPreferencePage#init(IWorkbench)
	 */
	public void init(IWorkbench workbench) {
		selectedProfile = preferences.getString(CssCorePreferences.PROFILE);
	}

	// Private Methods ---------------------------------------------------------

	/**
	 * Creates the radio button group for selecting the default CSS profile.
	 * 
	 * @param composite the composite to add the group to
	 */
	private void createProfileRadioGroup(Composite composite) {
		Group profileGroup = new Group(composite, SWT.SHADOW_ETCHED_IN);
		GridLayout layout = new GridLayout();
		layout.numColumns = 1;
		profileGroup.setLayout(layout);
		profileGroup.setText(getString("profile")); //$NON-NLS-1$

		IProfileDescriptor[] profiles = getProfileDescriptors();
		profileButtons = new Button[profiles.length];
		for (int i = 0; i < profiles.length; i++) {
			Button button = new Button(profileGroup, SWT.RADIO | SWT.LEFT);
			button.setText(profiles[i].getName());
			button.setData(profiles[i].getId());
			if (profiles[i].getId().equals(selectedProfile)) {
				button.setSelection(true);
			}
			button.addSelectionListener(new SelectionAdapter() {
				public void widgetSelected(SelectionEvent event) {
					selectedProfile = (String) event.widget.getData();
				}
			});
			profileButtons[i] = button;
		}
	}

	/**
	 * Returns all available profile descriptors, alphabetically sorted by 
	 * display name.
	 * 
	 * @return the profile descriptors
	 */
	private IProfileDescriptor[] getProfileDescriptors() {
		IProfileManager mgr = CssCore.getDefault().getProfileManager();
		IProfileDescriptor[] profiles = mgr.getProfileDescriptors();
		Arrays.sort(profiles, new Comparator() {
			public int compare(Object o1, Object o2) {
				return ((IProfileDescriptor) o1).getName().compareTo(
						((IProfileDescriptor) o2).getName());
			}
		});
		return profiles;
	}

	private static String getString(String key) {
		return CssUIMessages.getString(
			"CssPreferencePage." + key); //$NON-NLS-1$
	}

}