/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.motorola.studio.android.command;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.wizard.WizardDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.INewWizard;
import org.eclipse.ui.PlatformUI;

/**
 * Abstract class intended to be used to create menu commands
 * for items in the MOTODEV Menu 
 */
abstract class NewWizardHandler extends AbstractHandler
{
    private static final int WIZARD_WIDTH = 500;

    /**
     * Opens a wizard
     * 
     * @param wizard the wizard to be opened
     */
    protected void openWizard(final INewWizard wizard)
    {
        if (!PlatformUI.getWorkbench().isClosing())
        {
            Shell shell = new Shell();

            ISelection selection =
                    PlatformUI.getWorkbench().getActiveWorkbenchWindow().getSelectionService()
                            .getSelection();
            IStructuredSelection structuredSelection;

            if (selection instanceof IStructuredSelection)
            {
                structuredSelection = (IStructuredSelection) selection;
            }
            else
            {
                structuredSelection = new StructuredSelection();
            }

            wizard.init(PlatformUI.getWorkbench(), structuredSelection);
            WizardDialog dialog = new WizardDialog(shell, wizard);

            dialog.setPageSize(WIZARD_WIDTH, SWT.DEFAULT);
            shell.pack();
            centralizeShell(shell);

            dialog.open();
        }
    }

    /**
     * Centralizes a shell on the display
     * 
     * @param shell The shell to be centralized
     */
    private void centralizeShell(Shell shell)
    {
        int displayWidth = shell.getDisplay().getClientArea().width;
        int displayHeight = shell.getDisplay().getClientArea().height;

        int x = (displayWidth - shell.getSize().x) / 2;
        int y = (displayHeight - shell.getSize().y) / 2;

        shell.setLocation(x, y);
    }
}