/*******************************************************************************
 * This file is part of logisim-evolution.
 *
 *   logisim-evolution is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   logisim-evolution is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with logisim-evolution.  If not, see <http://www.gnu.org/licenses/>.
 *
 *   Original code by Carl Burch (http://www.cburch.com), 2011.
 *   Subsequent modifications by :
 *     + Haute École Spécialisée Bernoise
 *       http://www.bfh.ch
 *     + Haute École du paysage, d'ingénierie et d'architecture de Genève
 *       http://hepia.hesge.ch/
 *     + Haute École d'Ingénierie et de Gestion du Canton de Vaud
 *       http://www.heig-vd.ch/
 *   The project is currently maintained by :
 *     + REDS Institute - HEIG-VD
 *       Yverdon-les-Bains, Switzerland
 *       http://reds.heig-vd.ch
 *******************************************************************************/

package com.cburch.logisim.gui.generic;

/**
 * Code taken from Cornell's version of Logisim:
 * http://www.cs.cornell.edu/courses/cs3410/2015sp/
 */
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

import com.cburch.logisim.file.LogisimFile;
import com.cburch.logisim.proj.Project;
import com.cburch.logisim.proj.ProjectEvent;
import com.cburch.logisim.proj.ProjectListener;

class ProjectExplorerModel extends DefaultTreeModel implements ProjectListener {

	static abstract class Node<T> extends DefaultMutableTreeNode {

		private static final long serialVersionUID = 1L;
		ProjectExplorerModel model;
		int oldIndex;
		int newIndex;

		Node(ProjectExplorerModel model, T userObject) {
			super(userObject);
			this.model = model;
		}

		abstract Node<T> create(T userObject);

		abstract void decommission();

		void fireNodeChanged() {
			Node<?> parent = (Node<?>) this.getParent();

			if (parent == null) {
				model.fireTreeStructureChanged(this, this.getPath(), null, null);
			} else {
				int[] indices = new int[] { parent.getIndex(this) };
				Object[] items = new Object[] { this.getUserObject() };
				model.fireTreeNodesChanged(this, parent.getPath(), indices,
						items);
			}
		}

		void fireNodesChanged(int[] indices, Node<?>[] children) {
			model.fireTreeNodesChanged(model, this.getPath(), indices, children);
		}

		void fireNodesInserted(int[] indices, Node<?>[] children) {
			model.fireTreeNodesInserted(model, this.getPath(), indices,
					children);
		}

		void fireNodesRemoved(int[] indices, Node<?>[] children) {
			model.fireTreeNodesRemoved(model, this.getPath(), indices, children);
		}

		void fireStructureChanged() {
			model.fireStructureChanged();
		}

		ProjectExplorerModel getModel() {
			return model;
		}

		public T getValue() {
			@SuppressWarnings("unchecked")
			T val = (T) getUserObject();
			return val;
		}

	}

	private static final long serialVersionUID = 1L;

	private Project proj;

	ProjectExplorerModel(Project proj) {
		super(null);
		this.proj = proj;
		setRoot(new ProjectExplorerLibraryNode(this, proj.getLogisimFile()));
		proj.addProjectListener(this);
	}

	void fireStructureChanged() {
		Node<?> root = (Node<?>) getRoot();
		if (root != null) {
			this.fireTreeStructureChanged(this, root.getUserObjectPath(), null,
					null);
		} else {
			this.fireTreeStructureChanged(this, null, null, null);
		}
	}

	// ProjectListener methods
	public void projectChanged(ProjectEvent event) {
		int act = event.getAction();

		if (act == ProjectEvent.ACTION_SET_FILE) {
			setLogisimFile(proj.getLogisimFile());
		}
	}

	private void setLogisimFile(LogisimFile file) {
		Node<?> oldRoot = (Node<?>) getRoot();
		oldRoot.decommission();

		if (file == null) {
			setRoot(null);
		} else {
			setRoot(new ProjectExplorerLibraryNode(this, file));
		}

		fireStructureChanged();
	}

	public void setProject(Project value) {
		Project old = proj;

		if (old != null) {
			old.removeProjectListener(this);
		}

		setLogisimFile(null);
		proj = value;

		if (value != null) {
			value.addProjectListener(this);
			setLogisimFile(value.getLogisimFile());
		}
	}

}