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///////////////////////////////////////////////////////////////////////////////
// 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.GraphSaveLoadUtils;
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;

/**
 * LoadGraph is an action that allows the user to load a session from a file.
 */
class LoadGraph extends AbstractAction {

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

    /**
     * Constructor for LoadGraph.
     *
     * @param graphEditable a {@link edu.cmu.tetradapp.editor.GraphEditable} object
     * @param title         a {@link java.lang.String} object
     */
    public LoadGraph(GraphEditable graphEditable, String title) {
        super(title);

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

        this.graphEditable = graphEditable;
    }

    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;
    }

    /**
     * Processes the event triggered by an action. This method is called when the user interacts with a component that
     * triggers an action event, such as a button.
     *
     * @param e the event to be processed
     */
    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) {
            JOptionPane.showMessageDialog((Component) this.graphEditable,
                    "No file was selected.", "Error", JOptionPane.ERROR_MESSAGE);
            return;
        }

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

        Graph graph = GraphSaveLoadUtils.loadGraph(file);
        LayoutUtil.defaultLayout(graph);
        this.graphEditable.setGraph(graph);
    }
}