/*******************************************************************************
 * Copyright (c) 2014, 2015 Cisco Systems, Inc. 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
 *  
 *******************************************************************************/
package com.cisco.yangide.editor.preferences;

import org.eclipse.core.runtime.preferences.InstanceScope;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.preference.PreferencePage;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPreferencePage;
import org.eclipse.ui.PlatformUI;
import org.osgi.service.prefs.BackingStoreException;

import com.cisco.yangide.editor.YangEditorPlugin;
import com.cisco.yangide.ui.preferences.OverlayPreferenceStore;

/**
 * @author Alexey Kholupko
 */
public abstract class AbstractConfigurationBlockPreferencePage extends PreferencePage implements
        IWorkbenchPreferencePage {

    private IPreferenceConfigurationBlock fConfigurationBlock;
    private OverlayPreferenceStore fOverlayStore;

    /**
     * Creates a new preference page.
     */
    public AbstractConfigurationBlockPreferencePage() {
        setDescription();
        setPreferenceStore();
        fOverlayStore = new OverlayPreferenceStore(getPreferenceStore(), new OverlayPreferenceStore.OverlayKey[] {});
        fConfigurationBlock = createConfigurationBlock(fOverlayStore);
    }

    protected abstract IPreferenceConfigurationBlock createConfigurationBlock(
            OverlayPreferenceStore overlayPreferenceStore);

    protected abstract String getHelpId();

    protected abstract void setDescription();

    protected abstract void setPreferenceStore();

    /*
     * @see IWorkbenchPreferencePage#init()
     */
    public void init(IWorkbench workbench) {
    }

    /*
     * @see PreferencePage#createControl(Composite)
     */
    @Override
    public void createControl(Composite parent) {
        super.createControl(parent);
        PlatformUI.getWorkbench().getHelpSystem().setHelp(getControl(), getHelpId());
    }

    /*
     * @see PreferencePage#createContents(Composite)
     */
    @Override
    protected Control createContents(Composite parent) {

        fOverlayStore.load();
        fOverlayStore.start();

        Control content = fConfigurationBlock.createControl(parent);

        initialize();

        Dialog.applyDialogFont(content);
        return content;
    }

    private void initialize() {
        fConfigurationBlock.initialize();
    }

    /*
     * @see PreferencePage#performOk()
     */
    @Override
    public boolean performOk() {

        fConfigurationBlock.performOk();

        fOverlayStore.propagate();

        // TODO etxract to plugin class

        try {
            InstanceScope.INSTANCE.getNode(YangEditorPlugin.PLUGIN_ID).flush();
        } catch (BackingStoreException e) {
            YangEditorPlugin.log(e);
        }

        return true;
    }

    /*
     * @see PreferencePage#performDefaults()
     */
    @Override
    public void performDefaults() {

        fOverlayStore.loadDefaults();
        fConfigurationBlock.performDefaults();

        super.performDefaults();
    }

    /*
     * @see DialogPage#dispose()
     */
    @Override
    public void dispose() {

        fConfigurationBlock.dispose();

        if (fOverlayStore != null) {
            fOverlayStore.stop();
            fOverlayStore = null;
        }

        super.dispose();
    }
}