/*******************************************************************************
 * Copyright (c) 2000, 2017 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
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.refactoring;

import org.eclipse.dltk.internal.corext.refactoring.tagging.IDelegateUpdating;
import org.eclipse.dltk.ui.DLTKUIPlugin;
import org.eclipse.ltk.core.refactoring.Refactoring;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;

/**
 * This is a helper class to keep a consistent design between refactorings
 * capable of creating delegates.
 *
 */
public class DelegateUIHelper {

	public static Button generateDeprecateDelegateCheckbox(Composite parent,
			Refactoring refactoring) {
		final IDelegateUpdating updating = refactoring
				.getAdapter(IDelegateUpdating.class);
		if (updating == null || !updating.canEnableDelegateUpdating())
			return null;
		final Button button = createCheckbox(parent,
				getDeprecateDelegateCheckBoxTitle(),
				loadDeprecateDelegateSetting(updating));
		updating.setDeprecateDelegates(button.getSelection());
		button.addSelectionListener(new SelectionAdapter() {

			@Override
			public void widgetSelected(SelectionEvent e) {
				updating.setDeprecateDelegates(button.getSelection());
			}
		});
		return button;
	}

	public static Button generateLeaveDelegateCheckbox(Composite parent,
			Refactoring refactoring, boolean plural) {
		final IDelegateUpdating updating = refactoring
				.getAdapter(IDelegateUpdating.class);
		if (updating == null || !updating.canEnableDelegateUpdating())
			return null;
		final Button button = createCheckbox(parent,
				updating.getDelegateUpdatingTitle(plural),
				loadLeaveDelegateSetting(updating));
		updating.setDelegateUpdating(button.getSelection());
		button.addSelectionListener(new SelectionAdapter() {

			@Override
			public void widgetSelected(SelectionEvent e) {
				updating.setDelegateUpdating(button.getSelection());
			}
		});
		return button;
	}

	public static void saveLeaveDelegateSetting(Button button) {
		saveBooleanSetting(DELEGATE_UPDATING, button);
	}

	public static void saveDeprecateDelegateSetting(Button button) {
		saveBooleanSetting(DELEGATE_DEPRECATION, button);
	}

	public static boolean loadLeaveDelegateSetting(
			IDelegateUpdating refactoring) {
		return getBooleanSetting(DELEGATE_UPDATING,
				refactoring.getDelegateUpdating());
	}

	public static boolean loadDeprecateDelegateSetting(
			IDelegateUpdating refactoring) {
		return getBooleanSetting(DELEGATE_DEPRECATION,
				refactoring.getDeprecateDelegates());
	}

	public static String getDeprecateDelegateCheckBoxTitle() {
		return RefactoringMessages.DelegateCreator_deprecate_delegates;
	}

	// ************** Helper methods *******************

	private static final String DELEGATE_UPDATING = "delegateUpdating"; //$NON-NLS-1$

	private static final String DELEGATE_DEPRECATION = "delegateDeprecation"; //$NON-NLS-1$

	private DelegateUIHelper() {
		// no instances
	}

	private static Button createCheckbox(Composite parent, String title,
			boolean value) {
		Button checkBox = new Button(parent, SWT.CHECK);
		checkBox.setText(title);
		checkBox.setSelection(value);
		return checkBox;
	}

	private static boolean getBooleanSetting(String key, boolean defaultValue) {
		String update = DLTKUIPlugin.getDefault().getDialogSettings().get(key);
		if (update != null)
			return Boolean.valueOf(update).booleanValue();
		else
			return defaultValue;
	}

	private static void saveBooleanSetting(String key, Button button) {
		if (button != null && !button.isDisposed() && button.getEnabled())
			DLTKUIPlugin.getDefault().getDialogSettings().put(key,
					button.getSelection());
	}
}