/*******************************************************************************
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership.
 * 
 * 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 hr.fer.zemris.vhdllab.applets.schema2.gui.toolbars.selectcomponent;

import hr.fer.zemris.vhdllab.applets.editor.schema2.enums.ECanvasState;
import hr.fer.zemris.vhdllab.applets.editor.schema2.enums.EPropertyChange;
import hr.fer.zemris.vhdllab.applets.editor.schema2.interfaces.ILocalGuiController;
import hr.fer.zemris.vhdllab.applets.editor.schema2.interfaces.ISchemaComponent;
import hr.fer.zemris.vhdllab.applets.editor.schema2.interfaces.ISchemaController;
import hr.fer.zemris.vhdllab.applets.editor.schema2.interfaces.ISchemaInfo;
import hr.fer.zemris.vhdllab.applets.editor.schema2.misc.Caseless;
import hr.fer.zemris.vhdllab.applets.schema2.gui.canvas.CanvasToolbarLocalGUIController;

import java.awt.BorderLayout;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.Map;

import javax.swing.AbstractListModel;
import javax.swing.DefaultListModel;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

/**
 * Toolbar za odabir postojecih komponenti koje se mogu iscrtavati
 * 
 * @author Garfield
 * 
 */
public class ComponentToAddToolbar extends JPanel implements
		PropertyChangeListener, ListSelectionListener {

	private static final long serialVersionUID = -4549154212847889157L;

	/**
	 * Debug/retail mode
	 */
	public static final boolean DEBUG_MODE = true;

	/**
	 * Schema controller
	 */
	private ISchemaController schemaController = null;

	/**
	 * List box
	 */
	JList list = null;

	/**
	 * Local controller za komunikaciju medju toolbarima
	 */
	private ILocalGuiController localController;

	/**
	 * Constructor
	 * 
	 * @param schemaController
	 *            schema controller
	 * @param localController
	 *            local GUI controller
	 */
	public ComponentToAddToolbar(ISchemaController schemaController,
			ILocalGuiController localController) {

		if (schemaController == null) {
			throw new NullPointerException("Schema controller cannot be null!");
		}

		if (localController == null) {
			throw new NullPointerException(
					"Local GUI controller cannot be null!");
		}

		this.schemaController = schemaController;
		this.localController = localController;
		initToolbar();
	}

	/**
	 * Init Toolbar GUI
	 */
	private void initToolbar() {
		setLayout(new BorderLayout());

		initList();

		add(new JLabel("Components:"), BorderLayout.NORTH);
		add(list, BorderLayout.CENTER);
	}

	private void initList() {
		AbstractListModel listModel = null;

		listModel = getListBoxModel();
		list = new JList(listModel);
		list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		list.setLayoutOrientation(JList.VERTICAL);
		list.addListSelectionListener(this);

		if (localController.getState() == ECanvasState.ADD_COMPONENT_STATE) {
			setFirstComponent();
		}
	}

	/**
	 * Creates a new list box model filled wiht available components
	 * 
	 * @return
	 */
	private AbstractListModel getListBoxModel() {
		ISchemaInfo si = schemaController.getSchemaInfo();
		Map<Caseless, ISchemaComponent> prototypes = si.getPrototypes();
		DefaultListModel listModel = new DefaultListModel();

		if (DEBUG_MODE) {
			System.out.println("ComponentToAddToolbar: numberOfPrototypes="
					+ prototypes.size());
		}

		for (Map.Entry<Caseless, ISchemaComponent> elem : prototypes.entrySet()) {
			listModel.addElement(elem.getKey().toString());
			if (DEBUG_MODE) {
				System.out.println("ComponentToAddToolbar: addedComponent="
						+ elem.getKey().toString());
			}
		}

		return listModel;
	}

	private void setFirstComponent() {
		if (list.getModel().getSize() > 0) {
			localController.setComponentToAdd(new Caseless(list.getModel()
					.getElementAt(0).toString()));
			list.setSelectedIndex(0);

		}
	}

	public void refreshList() {
		if (DEBUG_MODE) {
			System.out
					.println("ComponentToAddToolbar: propertyChangeEvent-refreshing list");
		}
		remove(list);

		initList();
		add(list, BorderLayout.CENTER);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.beans.PropertyChangeListener#propertyChange(java.beans.PropertyChangeEvent)
	 */
	public void propertyChange(PropertyChangeEvent evt) {
		if (DEBUG_MODE) {
			System.out
					.println("ComponentToAddToolbar: propertyChangeEvent, eventName="
							+ evt.getPropertyName());
		}

		if (evt.getPropertyName().equals(
				CanvasToolbarLocalGUIController.PROPERTY_CHANGE_STATE)) {
			if (localController.getComponentToAdd() == null) {
				if (ComponentToAddToolbar.DEBUG_MODE) {
					System.out
							.println("ComponentToAddToolbar: settingFirstComponent");
				}
				setFirstComponent();
				return;
			}
		} else if (evt.getPropertyName().equals(
				EPropertyChange.PROTOTYPES_CHANGE.toString())) {
			refreshList();
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.swing.event.ListSelectionListener#valueChanged(javax.swing.event.ListSelectionEvent)
	 */
	public void valueChanged(ListSelectionEvent e) {
		localController.setComponentToAdd(new Caseless(list.getSelectedValue()
				.toString()));

		if (ComponentToAddToolbar.DEBUG_MODE) {
			System.out.println("ComponentToAddToolbar: selectedItem="
					+ list.getSelectedValue().toString());
		}

		localController.setState(ECanvasState.ADD_COMPONENT_STATE);
	}

}