/*******************************************************************************
 * Copyright (c) 2009, 2010 Oracle. 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:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.common.ui.internal.utility.swt;

import java.util.Arrays;

import org.eclipse.jpt.common.utility.internal.BitTools;
import org.eclipse.jpt.common.utility.internal.StringConverter;
import org.eclipse.jpt.common.utility.internal.model.value.StaticCollectionValueModel;
import org.eclipse.jpt.common.utility.internal.model.value.WritablePropertyCollectionValueModelAdapter;
import org.eclipse.jpt.common.utility.model.value.CollectionValueModel;
import org.eclipse.jpt.common.utility.model.value.ListValueModel;
import org.eclipse.jpt.common.utility.model.value.PropertyValueModel;
import org.eclipse.jpt.common.utility.model.value.WritableCollectionValueModel;
import org.eclipse.jpt.common.utility.model.value.WritablePropertyValueModel;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.Widget;

/**
 * Various SWT tools.
 */
@SuppressWarnings("nls")
public final class SWTTools {

	// ********** check-box/radio button/toggle button **********

	/**
	 * Bind the specified button (check-box, radio button, or toggle button)
	 * to the specified boolean model.
	 * If the boolean model is <code>null<code>, the button's 'selection' state will
	 * be <code>false<code>.
	 */
	public static void bind(WritablePropertyValueModel<Boolean> booleanModel, Button button) {
		bind(booleanModel, button, false);
	}

	/**
	 * Bind the specified button (check-box, radio button, or toggle button)
	 * to the specified boolean model.
	 * If the boolean model is <code>null<code>, the button's 'selection' state will
	 * be the specified default value.
	 */
	public static void bind(WritablePropertyValueModel<Boolean> booleanModel, Button button, boolean defaultValue) {
		// the new binding will add itself as a listener to the boolean model and the button
		new BooleanButtonModelBinding(booleanModel, button, defaultValue);
	}


	// ********** text field **********

	/**
	 * Bind the specified text model to the specified text field.
	 */
	public static <E> void bind(WritablePropertyValueModel<String> textModel, Text textField) {
		// the new binding will add itself as a listener to the text model and the text field
		new TextFieldModelBinding(textModel, textField);
	}


	// ********** list box **********

	/**
	 * Bind the specified model list to the specified list box.
	 * The list box selection is ignored.
	 * Use the default string converter to convert the model items to strings
	 * to be displayed in the list box, which calls {@link Object#toString()}
	 * on the items in the model list.
	 */
	public static <E> void bind(ListValueModel<E> listModel, List listBox) {
		bind(listModel, listBox, StringConverter.Default.<E>instance());
	}

	/**
	 * Bind the specified model list to the specified list box.
	 * The list box selection is ignored.
	 * Use the specified string converter to convert the model items to strings
	 * to be displayed in the list box.
	 */
	public static <E> void bind(ListValueModel<E> listModel, List listBox, StringConverter<E> stringConverter) {
		bind(listModel, new SWTListAdapter(listBox), stringConverter);
	}

	/**
	 * Bind the specified model list and selection to the specified list box.
	 * Use the default string converter to convert the model items to strings
	 * to be displayed in the list box, which calls {@link Object#toString()}
	 * on the items in the model list.
	 */
	public static <E> void bind(ListValueModel<E> listModel, WritablePropertyValueModel<E> selectedItemModel, List listBox) {
		bind(listModel, selectedItemModel, listBox, StringConverter.Default.<E>instance());
	}

	/**
	 * Adapt the specified model list and selection to the specified list box.
	 * Use the specified string converter to convert the model items to strings
	 * to be displayed in the list box.
	 */
	public static <E> void bind(ListValueModel<E> listModel, WritablePropertyValueModel<E> selectedItemModel, List listBox, StringConverter<E> stringConverter) {
		checkForSingleSelectionStyle(listBox);
		bind(listModel, new WritablePropertyCollectionValueModelAdapter<E>(selectedItemModel), listBox, stringConverter);
	}

	/**
	 * Bind the specified model list and selections to the specified list box.
	 * Use the default string converter to convert the model items to strings
	 * to be displayed in the list box, which calls {@link Object#toString()}
	 * on the items in the model list.
	 */
	public static <E> void bind(ListValueModel<E> listModel, WritableCollectionValueModel<E> selectedItemsModel, List listBox) {
		bind(listModel, selectedItemsModel, listBox, StringConverter.Default.<E>instance());
	}

	/**
	 * Bind the specified model list and selections to the specified list box.
	 * Use the specified string converter to convert the model items to strings
	 * to be displayed in the list box.
	 */
	public static <E> void bind(ListValueModel<E> listModel, WritableCollectionValueModel<E> selectedItemsModel, List listBox, StringConverter<E> stringConverter) {
		bind(
			listModel,
			new SWTListAdapter(listBox),
			stringConverter,
			new ListBoxSelectionBinding<E>(listModel, selectedItemsModel, listBox)
		);
	}

	private static void checkForSingleSelectionStyle(List listBox) {
		if ( ! BitTools.flagIsSet(listBox.getStyle(), SWT.SINGLE)) {
			throw new IllegalStateException("list box must be single-selection: " + listBox);
		}
	}


	// ********** drop-down list box **********

	/**
	 * Bind the specified model list and selection to the specified drop-down list box.
	 * Use the default string converter to convert the model items to strings
	 * to be displayed in the drop-down list box, which calls {@link Object#toString()}
	 * on the items in the model list.
	 */
	public static <E> void bind(ListValueModel<E> listModel, WritablePropertyValueModel<E> selectedItemModel, Combo dropDownListBox) {
		bind(listModel, selectedItemModel, dropDownListBox, StringConverter.Default.<E>instance());
	}

	/**
	 * Adapt the specified model list and selection to the specified drop-down list box.
	 * Use the specified string converter to convert the model items to strings
	 * to be displayed in the drop-down list box.
	 */
	public static <E> void bind(ListValueModel<E> listModel, WritablePropertyValueModel<E> selectedItemModel, Combo dropDownListBox, StringConverter<E> stringConverter) {
		checkForReadOnlyStyle(dropDownListBox);
		SWTComboAdapter comboAdapter = new SWTComboAdapter(dropDownListBox);
		bind(
			listModel,
			comboAdapter,
			stringConverter,
			new DropDownListBoxSelectionBinding<E>(listModel, selectedItemModel, comboAdapter)
		);
	}

	private static void checkForReadOnlyStyle(Widget comboBox) {
		if ( ! BitTools.flagIsSet(comboBox.getStyle(), SWT.READ_ONLY)) {
			throw new IllegalStateException("combo-box must be read-only: " + comboBox);
		}
	}


	// ********** list "widget" **********

	/**
	 * Bind the specified model list to the specified list widget.
	 * The list widget's selection is ignored.
	 * Use the specified string converter to convert the model items to strings
	 * to be displayed in the list box.
	 */
	private static <E> void bind(ListValueModel<E> listModel, ListWidgetModelBinding.ListWidget listWidget, StringConverter<E> stringConverter) {
		bind(listModel, listWidget, stringConverter, ListWidgetModelBinding.SelectionBinding.Null.instance());
	}

	/**
	 * Bind the specified model list to the specified list widget.
	 * Use the specified selection binding to control the list widget's selection.
	 * Use the specified string converter to convert the model items to strings
	 * to be displayed in the list box.
	 */
	private static <E> void bind(ListValueModel<E> listModel, ListWidgetModelBinding.ListWidget listWidget, StringConverter<E> stringConverter, ListWidgetModelBinding.SelectionBinding selectionBinding) {
		// the new binding will add itself as a listener to the value models and the list box
		new ListWidgetModelBinding<E>(listModel, listWidget, stringConverter, selectionBinding);
	}


	// ********** 'enabled' state **********

	/**
	 * Control the <em>enabled</em> state of the specified controls with the
	 * specified boolean. If the boolean is <code>null<code>, the controls'
	 * <em>enabled</em> states will be <code>false<code>.
	 */
	public static void controlEnabledState(PropertyValueModel<Boolean> booleanModel, Control... controls) {
		controlEnabledState(booleanModel, controls, false);
	}

	/**
	 * Control the <em>enabled</em> state of the specified controls with the
	 * specified boolean. If the boolean is <code>null<code>, the controls'
	 * <em>enabled</em> states will be the specified default value.
	 */
	public static void controlEnabledState(PropertyValueModel<Boolean> booleanModel, Control[] controls, boolean defaultValue) {
		switch (controls.length) {
			case 0:
				throw new IllegalArgumentException("empty controls array: " + Arrays.toString(controls));
			case 1:
				controlEnabledState(booleanModel, controls[0], defaultValue);
				break;
			default:
				controlEnabledState(booleanModel, new StaticCollectionValueModel<Control>(controls), defaultValue);
				break;
		}
	}

	/**
	 * Control the <em>enabled</em> state of the specified controls with the
	 * specified boolean. If the boolean is <code>null<code>, the controls'
	 * <em>enabled</em> states will be <code>false<code>.
	 */
	public static void controlEnabledState(PropertyValueModel<Boolean> booleanModel, Iterable<? extends Control> controls) {
		controlEnabledState(booleanModel, controls, false);
	}

	/**
	 * Control the <em>enabled</em> state of the specified controls with the
	 * specified boolean. If the boolean is <code>null<code>, the controls'
	 * <em>enabled</em> states will be the specified default value.
	 */
	public static void controlEnabledState(PropertyValueModel<Boolean> booleanModel, Iterable<? extends Control> controls, boolean defaultValue) {
		controlEnabledState(booleanModel, new StaticCollectionValueModel<Control>(controls), defaultValue);
	}

	/**
	 * Control the <em>enabled</em> state of the specified controls with the
	 * specified boolean. If the boolean is <code>null<code>, the controls'
	 * <em>enabled</em> states will be <code>false<code>.
	 */
	public static void controlEnabledState(PropertyValueModel<Boolean> booleanModel, CollectionValueModel<? extends Control> controlsModel) {
		controlEnabledState(booleanModel, controlsModel, false);
	}

	/**
	 * Control the <em>enabled</em> state of the specified controls with the
	 * specified boolean. If the boolean is <code>null<code>, the controls'
	 * <em>enabled</em> states will be the specified default value.
	 */
	public static void controlEnabledState(PropertyValueModel<Boolean> booleanModel, CollectionValueModel<? extends Control> controlsModel, boolean defaultValue) {
		control(booleanModel, controlsModel, defaultValue, ENABLED_ADAPTER);
	}

	/**
	 * Control the <em>enabled</em> state of the specified control with the
	 * specified boolean. If the boolean is <code>null<code>, the control's
	 * <em>enabled</em> state will be the specified default value.
	 */
	public static void controlEnabledState(PropertyValueModel<Boolean> booleanModel, Control control, boolean defaultValue) {
		control(booleanModel, control, defaultValue, ENABLED_ADAPTER);
	}

	private static final BooleanStateController.Adapter ENABLED_ADAPTER =
			new BooleanStateController.Adapter() {
				public void setState(Control control, boolean b) {
					control.setEnabled(b);
				}
			};
   

	// ********** 'visible' state **********

	/**
	 * Control the <em>visible</em> state of the specified controls with the
	 * specified boolean. If the boolean is <code>null<code>, the controls'
	 * <em>visible</em> states will be <code>false<code>.
	 */
	public static void controlVisibleState(PropertyValueModel<Boolean> booleanModel, Control... controls) {
		controlVisibleState(booleanModel, controls, false);
	}

	/**
	 * Control the <em>visible</em> state of the specified controls with the
	 * specified boolean. If the boolean is <code>null<code>, the controls'
	 * <em>visible</em> states will be the specified default value.
	 */
	public static void controlVisibleState(PropertyValueModel<Boolean> booleanModel, Control[] controls, boolean defaultValue) {
		switch (controls.length) {
			case 0:
				throw new IllegalArgumentException("empty controls array: " + Arrays.toString(controls));
			case 1:
				controlVisibleState(booleanModel, controls[0], defaultValue);
				break;
			default:
				controlVisibleState(booleanModel, new StaticCollectionValueModel<Control>(controls), defaultValue);
				break;
		}
	}

	/**
	 * Control the <em>visible</em> state of the specified controls with the
	 * specified boolean. If the boolean is <code>null<code>, the controls'
	 * <em>visible</em> states will be <code>false<code>.
	 */
	public static void controlVisibleState(PropertyValueModel<Boolean> booleanModel, Iterable<? extends Control> controls) {
		controlVisibleState(booleanModel, controls, false);
	}

	/**
	 * Control the <em>visible</em> state of the specified controls with the
	 * specified boolean. If the boolean is <code>null<code>, the controls'
	 * <em>visible</em> states will be the specified default value.
	 */
	public static void controlVisibleState(PropertyValueModel<Boolean> booleanModel, Iterable<? extends Control> controls, boolean defaultValue) {
		controlVisibleState(booleanModel, new StaticCollectionValueModel<Control>(controls), defaultValue);
	}

	/**
	 * Control the <em>visible</em> state of the specified controls with the
	 * specified boolean. If the boolean is <code>null<code>, the controls'
	 * <em>visible</em> states will be <code>false<code>.
	 */
	public static void controlVisibleState(PropertyValueModel<Boolean> booleanModel, CollectionValueModel<? extends Control> controlsModel) {
		controlVisibleState(booleanModel, controlsModel, false);
	}

	/**
	 * Control the <em>visible</em> state of the specified controls with the
	 * specified boolean. If the boolean is <code>null<code>, the controls'
	 * <em>visible</em> states will be the specified default value.
	 */
	public static void controlVisibleState(PropertyValueModel<Boolean> booleanModel, CollectionValueModel<? extends Control> controlsModel, boolean defaultValue) {
		control(booleanModel, controlsModel, defaultValue, VISIBLE_ADAPTER);
	}

	/**
	 * Control the <em>visible</em> state of the specified control with the
	 * specified boolean. If the boolean is <code>null<code>, the control's
	 * <em>visible</em> state will be the specified default value.
	 */
	public static void controlVisibleState(PropertyValueModel<Boolean> booleanModel, Control control, boolean defaultValue) {
		control(booleanModel, control, defaultValue, VISIBLE_ADAPTER);
	}

	private static final BooleanStateController.Adapter VISIBLE_ADAPTER =
			new BooleanStateController.Adapter() {
				public void setState(Control control, boolean b) {
					control.setVisible(b);
				}
			};
   

	// ********** boolean state controller **********

	private static void control(PropertyValueModel<Boolean> booleanModel, CollectionValueModel<? extends Control> controlsModel, boolean defaultValue, BooleanStateController.Adapter adapter) {
		// the new controller will add itself as a listener to the value model and the controls
		new MultiControlBooleanStateController(booleanModel, controlsModel, defaultValue, adapter);
	}

	private static void control(PropertyValueModel<Boolean> booleanModel, Control control, boolean defaultValue, BooleanStateController.Adapter adapter) {
		// the new controller will add itself as a listener to the value model and the controls
		new SimpleBooleanStateController(booleanModel, control, defaultValue, adapter);
	}


	// ********** constructor **********

	/**
	 * Suppress default constructor, ensuring non-instantiability.
	 */
	private SWTTools() {
		super();
		throw new UnsupportedOperationException();
	}

}