///////////////////////////////////////////////////////////////////////////////
// For information as to what this class does, see the Javadoc, below.       //
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,       //
// 2007, 2008, 2009, 2010, 2014, 2015, 2022 by Peter Spirtes, Richard        //
// Scheines, Joseph Ramsey, and Clark Glymour.                               //
//                                                                           //
// 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 2 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, write to the Free Software               //
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA //
///////////////////////////////////////////////////////////////////////////////

package edu.cmu.tetradapp.editor;

import edu.cmu.tetrad.graph.Graph;
import edu.cmu.tetrad.graph.GraphPersistence;
import edu.cmu.tetrad.graph.LayoutUtil;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.io.File;
import java.util.prefs.Preferences;

/**
 * Saves out a PNG image for a component.
 *
 * @author josephramsey
 */
class LoadGraph extends AbstractAction {

    /**
     * The component whose image is to be saved.
     */
    private final GraphEditable graphEditable;

    public LoadGraph(GraphEditable graphEditable, String title) {
        super(title);

        if (graphEditable == null) {
            throw new NullPointerException("Component must not be null.");
        }

        this.graphEditable = graphEditable;
    }

    /**
     * Performs the action of loading a session from a file.
     */
    public void actionPerformed(ActionEvent e) {
        JFileChooser chooser = LoadGraph.getJFileChooser();
        chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
        chooser.showOpenDialog((Component) this.graphEditable);

        File file = chooser.getSelectedFile();

        if (file == null) {
            System.out.println("File was null.");
            return;
        }

        Preferences.userRoot().put("fileSaveLocation", file.getParent());

        Graph graph = GraphPersistence.loadGraph(file);
        LayoutUtil.circleLayout(graph, 200, 200, 150);
        this.graphEditable.setGraph(graph);
    }

    private static JFileChooser getJFileChooser() {
        JFileChooser chooser = new JFileChooser();
        String sessionSaveLocation =
                Preferences.userRoot().get("fileSaveLocation", "");
        chooser.setCurrentDirectory(new File(sessionSaveLocation));
        chooser.resetChoosableFileFilters();
        chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
        return chooser;
    }
}



