/*******************************************************************************
 * Copyright (c) 2007, 2008 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ltk.ui.refactoring.resource;

import org.eclipse.core.resources.IResource;

import org.eclipse.ltk.core.refactoring.participants.DeleteRefactoring;

import org.eclipse.ltk.internal.core.refactoring.Resources;
import org.eclipse.ltk.internal.core.refactoring.resource.DeleteResourcesProcessor;
import org.eclipse.ltk.internal.ui.refactoring.BasicElementLabels;
import org.eclipse.ltk.internal.ui.refactoring.Messages;
import org.eclipse.ltk.internal.ui.refactoring.RefactoringUIMessages;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;

import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.layout.LayoutConstants;
import org.eclipse.jface.wizard.IWizardPage;

import org.eclipse.ltk.ui.refactoring.RefactoringWizard;
import org.eclipse.ltk.ui.refactoring.UserInputWizardPage;

/**
 * A wizard for the delete resources refactoring.
 *
 * @since 3.4
 */
public class DeleteResourcesWizard extends RefactoringWizard {

	/**
	 * Creates a {@link DeleteResourcesWizard}
	 * 
	 * @param resources the resources to delete
	 */
	public DeleteResourcesWizard(IResource[] resources) {
		super(new DeleteRefactoring(new DeleteResourcesProcessor(resources, false)), DIALOG_BASED_USER_INTERFACE);
		setDefaultPageTitle(RefactoringUIMessages.DeleteResourcesWizard_page_title);
		setWindowTitle(RefactoringUIMessages.DeleteResourcesWizard_window_title);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ltk.ui.refactoring.RefactoringWizard#addUserInputPages()
	 */
	protected void addUserInputPages() {
		DeleteResourcesProcessor processor= (DeleteResourcesProcessor) getRefactoring().getAdapter(DeleteResourcesProcessor.class);
		addPage(new DeleteResourcesRefactoringConfigurationPage(processor));
	}

	private static class DeleteResourcesRefactoringConfigurationPage extends UserInputWizardPage {

		private DeleteResourcesProcessor fRefactoringProcessor;
		private Button fDeleteContentsButton;

		public DeleteResourcesRefactoringConfigurationPage(DeleteResourcesProcessor processor) {
			super("DeleteResourcesRefactoringConfigurationPage"); //$NON-NLS-1$
			fRefactoringProcessor= processor;
		}

		public void createControl(Composite parent) {
			initializeDialogUnits(parent);

			Point defaultSpacing= LayoutConstants.getSpacing();
			
			Composite composite= new Composite(parent, SWT.NONE);
			GridLayout gridLayout= new GridLayout(2, false);
			gridLayout.horizontalSpacing= defaultSpacing.x * 2;
			gridLayout.verticalSpacing= defaultSpacing.y;

			composite.setLayout(gridLayout);
			composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
			composite.setFont(parent.getFont());
						
			Image image= parent.getDisplay().getSystemImage(SWT.ICON_QUESTION);
			Label imageLabel = new Label(composite, SWT.NULL);
			imageLabel.setBackground(image.getBackground());
			imageLabel.setImage(image);
			imageLabel.setLayoutData(new GridData(SWT.CENTER, SWT.BEGINNING, false, false));
			
			IResource[] resources= fRefactoringProcessor.getResourcesToDelete();
			Label label= new Label(composite, SWT.WRAP);
			label.setFont(composite.getFont());
			
			if (containsLinkedResource(resources)) {
				if (resources.length == 1) {
					label.setText(Messages.format(RefactoringUIMessages.DeleteResourcesWizard_label_single_linked, BasicElementLabels.getResourceName(resources[0])));
				} else {
					label.setText(Messages.format(RefactoringUIMessages.DeleteResourcesWizard_label_multi_linked, new Integer(resources.length)));
				}
			} else {
				if (resources.length == 1) {
					label.setText(Messages.format(RefactoringUIMessages.DeleteResourcesWizard_label_single, BasicElementLabels.getResourceName(resources[0])));
				} else {
					label.setText(Messages.format(RefactoringUIMessages.DeleteResourcesWizard_label_multi, new Integer(resources.length)));
				}
			}
			GridData gridData= new GridData(SWT.FILL, SWT.FILL, true, false);
			gridData.widthHint= convertHorizontalDLUsToPixels(IDialogConstants.MINIMUM_MESSAGE_AREA_WIDTH);
			label.setLayoutData(gridData);
			
			Composite supportArea= new Composite(composite, SWT.NONE);
			supportArea.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1));
			gridLayout= new GridLayout(1, false);
			gridLayout.horizontalSpacing= defaultSpacing.x * 2;
			gridLayout.verticalSpacing= defaultSpacing.y;

			supportArea.setLayout(gridLayout);
						
			if (Resources.containsOnlyProjects(resources)) {
				fDeleteContentsButton= new Button(supportArea, SWT.CHECK);
				fDeleteContentsButton.setFont(composite.getFont());
				fDeleteContentsButton.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
				fDeleteContentsButton.setText(RefactoringUIMessages.DeleteResourcesWizard_project_deleteContents);
				fDeleteContentsButton.setFocus();
			}
			setControl(composite);
		}
		
		private boolean containsLinkedResource(IResource[] resources) {
			for (int i = 0; i < resources.length; i++) {
				IResource resource = resources[i];
				if (resource != null && resource.isLinked()) { // paranoia code, can not be null
					return true;
				}
			}
			return false;
		}

		protected boolean performFinish() {
			initializeRefactoring();
			storeSettings();
			return super.performFinish();
		}

		public IWizardPage getNextPage() {
			initializeRefactoring();
			storeSettings();
			return super.getNextPage();
		}

		private void initializeRefactoring() {
			fRefactoringProcessor.setDeleteContents(fDeleteContentsButton == null ? false : fDeleteContentsButton.getSelection());
		}

		private void storeSettings() {
		}
	}
}
