/*
 *  Copyright (C) 2010-2026 JPEXS
 * 
 *  This program 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.
 * 
 *  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.javagl.treetable;

import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeExpansionListener;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.tree.TreePath;

/**
 * This is a wrapper class takes a TreeTableModel and implements the table model
 * interface. The implementation is trivial, with all of the event dispatching
 * support provided by the superclass: the AbstractTableModel.
 */
class TreeTableModelAdapter extends AbstractTableModel
{
    /**
     * Serial UID
     */
    private static final long serialVersionUID = 8489726674002235447L;
    
    /**
     * The tree that backs this adapter. When the tree is expanded or 
     * collapsed, the table model is updated accordingly
     */
    private final JTree tree;
    
    /**
     * The backing {@link TreeTableModel}
     */
    private final TreeTableModel treeTableModel;

    /**
     * Default constructor
     * @param treeTableModel The backing {@link TreeTableModel}
     * @param tree The tree
     */
    TreeTableModelAdapter(TreeTableModel treeTableModel, JTree tree)
    {
        this.tree = tree;
        this.treeTableModel = treeTableModel;

        tree.addTreeExpansionListener(new TreeExpansionListener()
        {
            // Don't use fireTableRowsInserted() here; the selection model
            // would get updated twice.
            @Override
            public void treeExpanded(TreeExpansionEvent event)
            {
                fireTableDataChanged();
            }

            @Override
            public void treeCollapsed(TreeExpansionEvent event)
            {
                fireTableDataChanged();
            }
        });

        // Install a TreeModelListener that can update the table when
        // tree changes. We use delayedFireTableDataChanged as we can
        // not be guaranteed the tree will have finished processing
        // the event before us.
        treeTableModel.addTreeModelListener(new TreeModelListener()
        {
            @Override
            public void treeNodesChanged(TreeModelEvent e)
            {
                delayedFireTableDataChanged();
            }

            @Override
            public void treeNodesInserted(TreeModelEvent e)
            {
                delayedFireTableDataChanged();
            }

            @Override
            public void treeNodesRemoved(TreeModelEvent e)
            {
                delayedFireTableDataChanged();
            }

            @Override
            public void treeStructureChanged(TreeModelEvent e)
            {
                delayedFireTableDataChanged();
            }
        });
    }

    @Override
    public int getColumnCount()
    {
        return treeTableModel.getColumnCount();
    }

    @Override
    public String getColumnName(int column)
    {
        return treeTableModel.getColumnName(column);
    }

    @Override
    public Class<?> getColumnClass(int column)
    {
        return treeTableModel.getColumnClass(column);
    }

    @Override
    public int getRowCount()
    {
        return tree.getRowCount();
    }

    @Override
    public Object getValueAt(int row, int column)
    {
        return treeTableModel.getValueAt(nodeForRow(row), column);
    }

    @Override
    public boolean isCellEditable(int row, int column)
    {
        return treeTableModel.isCellEditable(nodeForRow(row), column);
    }

    @Override
    public void setValueAt(Object value, int row, int column)
    {
        treeTableModel.setValueAt(value, nodeForRow(row), column);
    }

    
    /**
     * Returns the tree node that is located in the specified row
     *  
     * @param row The row
     * @return The tree node
     */
    private Object nodeForRow(int row)
    {
        TreePath treePath = tree.getPathForRow(row);
        return treePath.getLastPathComponent();
    }
    
    /**
     * Invokes fireTableDataChanged after all the pending events have been
     * processed. SwingUtilities.invokeLater is used to handle this.
     */
    private void delayedFireTableDataChanged()
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            @Override
            public void run()
            {
                fireTableDataChanged();
            }
        });
    }
}