package de.ugoe.cs.autoquest.usability.sandboxapp;

/*
 * Copyright (c) 2003, the JUNG Project and the Regents of the University of
 * California All rights reserved.
 * 
 * This software is open-source under the BSD license; see either "license.txt"
 * or http://jung.sourceforge.net/license.txt for a description.
 * 
 */

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Point2D;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Map;
import java.util.Queue;
import java.util.Set;

import javax.swing.BorderFactory;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JToggleButton;

import org.apache.commons.collections15.Factory;
import org.apache.commons.collections15.Transformer;
import org.apache.commons.collections15.functors.ConstantTransformer;

import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskTree;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskTreeNode;
import de.ugoe.cs.autoquest.usability.testutil.GenerateTaskTreeUtil;
import edu.uci.ics.jung.algorithms.layout.FRLayout;
import edu.uci.ics.jung.algorithms.layout.PolarPoint;
import edu.uci.ics.jung.algorithms.layout.RadialTreeLayout;
import edu.uci.ics.jung.algorithms.layout.TreeLayout;
import edu.uci.ics.jung.graph.DelegateForest;
import edu.uci.ics.jung.graph.DelegateTree;
import edu.uci.ics.jung.graph.DirectedGraph;
import edu.uci.ics.jung.graph.DirectedSparseMultigraph;
import edu.uci.ics.jung.graph.Forest;
import edu.uci.ics.jung.graph.Graph;
import edu.uci.ics.jung.graph.Tree;
import edu.uci.ics.jung.visualization.GraphZoomScrollPane;
import edu.uci.ics.jung.visualization.Layer;
import edu.uci.ics.jung.visualization.VisualizationServer;
import edu.uci.ics.jung.visualization.VisualizationViewer;
import edu.uci.ics.jung.visualization.control.CrossoverScalingControl;
import edu.uci.ics.jung.visualization.control.DefaultModalGraphMouse;
import edu.uci.ics.jung.visualization.control.ModalGraphMouse;
import edu.uci.ics.jung.visualization.control.ScalingControl;
import edu.uci.ics.jung.visualization.decorators.EdgeShape;
import edu.uci.ics.jung.visualization.decorators.EllipseVertexShapeTransformer;
import edu.uci.ics.jung.visualization.decorators.ToStringLabeller;
import edu.uci.ics.jung.visualization.subLayout.TreeCollapser;

/**
 * Demonstrates "collapsing"/"expanding" of a tree's subtrees.
 * 
 * @author Tom Nelson
 * 
 */
@SuppressWarnings("serial")
public class TaskTreeVisualizerDemoApp extends JApplet {

    private static final String fileToParse = "javatrace.xml";

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        Container content = frame.getContentPane();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        content.add(new TaskTreeVisualizerDemoApp(fileToParse));
        frame.pack();
        frame.setVisible(true);
    }

    /**
     * the graph
     */
    Forest<String, Integer> graph;

    Factory<DirectedGraph<String, Integer>> graphFactory =
        new Factory<DirectedGraph<String, Integer>>() {

            public DirectedGraph<String, Integer> create() {
                return new DirectedSparseMultigraph<String, Integer>();
            }
        };

    Factory<Tree<String, Integer>> treeFactory = new Factory<Tree<String, Integer>>() {

        public Tree<String, Integer> create() {
            return new DelegateTree<String, Integer>(graphFactory);
        }
    };

    Factory<Integer> edgeFactory = new Factory<Integer>() {
        int i = 0;

        public Integer create() {
            return i++;
        }
    };

    Factory<String> vertexFactory = new Factory<String>() {
        int i = 0;

        public String create() {
            return "V" + i++;
        }
    };

    /**
     * the visual component and renderer for the graph
     */
    VisualizationViewer<String, Integer> vv;

    VisualizationServer.Paintable rings;

    String root;

    TreeLayout<String, Integer> layout;
    @SuppressWarnings("rawtypes")
    FRLayout layout1;

    TreeCollapser collapser;

    RadialTreeLayout<String, Integer> radialLayout;

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public TaskTreeVisualizerDemoApp(String filetoparse) {
        
        ITaskTree taskTree = GenerateTaskTreeUtil.getTaskTreeFromFile(filetoparse); 
        
        // create a simple graph for the demo
        graph = new DelegateForest<String, Integer>();

        createTree(taskTree.getRoot().getChildren().get(0));

        layout = new TreeLayout<String, Integer>(graph);
        collapser = new TreeCollapser();

        radialLayout = new RadialTreeLayout<String, Integer>(graph);
        radialLayout.setSize(new Dimension(600, 600));
        vv = new VisualizationViewer<String, Integer>(layout, new Dimension(600, 600));
        vv.setBackground(Color.white);
        vv.getRenderContext().setEdgeShapeTransformer(new EdgeShape.Line());
        vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller());
        vv.getRenderContext().setVertexShapeTransformer(new ClusterVertexShapeFunction());
        // add a listener for ToolTips
        vv.setVertexToolTipTransformer(new ToStringLabeller());
        vv.getRenderContext()
            .setArrowFillPaintTransformer(new ConstantTransformer(Color.lightGray));
        rings = new Rings();

        Container content = getContentPane();
        final GraphZoomScrollPane panel = new GraphZoomScrollPane(vv);
        content.add(panel);

        final DefaultModalGraphMouse graphMouse = new DefaultModalGraphMouse();

        vv.setGraphMouse(graphMouse);

        JComboBox modeBox = graphMouse.getModeComboBox();
        modeBox.addItemListener(graphMouse.getModeListener());
        graphMouse.setMode(ModalGraphMouse.Mode.TRANSFORMING);

        final ScalingControl scaler = new CrossoverScalingControl();

        JButton plus = new JButton("+");
        plus.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                scaler.scale(vv, 1.1f, vv.getCenter());
            }
        });
        JButton minus = new JButton("-");
        minus.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                scaler.scale(vv, 1 / 1.1f, vv.getCenter());
            }
        });

        JToggleButton radial = new JToggleButton("Radial");
        radial.addItemListener(new ItemListener() {

            public void itemStateChanged(ItemEvent e) {
                if (e.getStateChange() == ItemEvent.SELECTED) {
                    // layout.setRadial(true);
                    vv.setGraphLayout(radialLayout);
                    vv.getRenderContext().getMultiLayerTransformer().setToIdentity();
                    vv.addPreRenderPaintable(rings);
                }
                else {
                    // layout.setRadial(false);
                    vv.setGraphLayout(layout);
                    vv.getRenderContext().getMultiLayerTransformer().setToIdentity();
                    vv.removePreRenderPaintable(rings);
                }
                vv.repaint();
            }
        });

        JButton collapse = new JButton("Collapse");
        collapse.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                Collection picked = new HashSet(vv.getPickedVertexState().getPicked());
                if (picked.size() == 1) {
                    Object root = picked.iterator().next();
                    Forest inGraph = (Forest) layout.getGraph();

                    try {
                        collapser.collapse(vv.getGraphLayout(), inGraph, root);
                    }
                    catch (InstantiationException e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }
                    catch (IllegalAccessException e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }

                    vv.getPickedVertexState().clear();
                    vv.repaint();
                }
            }
        });

        JButton expand = new JButton("Expand");
        expand.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                Collection picked = vv.getPickedVertexState().getPicked();
                for (Object v : picked) {
                    if (v instanceof Forest) {
                        Forest inGraph = (Forest) layout.getGraph();
                        collapser.expand(inGraph, (Forest) v);
                    }
                    vv.getPickedVertexState().clear();
                    vv.repaint();
                }
            }
        });

        JPanel scaleGrid = new JPanel(new GridLayout(1, 0));
        scaleGrid.setBorder(BorderFactory.createTitledBorder("Zoom"));

        JPanel controls = new JPanel();
        scaleGrid.add(plus);
        scaleGrid.add(minus);
        controls.add(radial);
        controls.add(scaleGrid);
        controls.add(modeBox);
        controls.add(collapse);
        controls.add(expand);
        content.add(controls, BorderLayout.SOUTH);
    }
    
    class Rings implements VisualizationServer.Paintable {

        Collection<Double> depths;

        public Rings() {
            depths = getDepths();
        }

        private Collection<Double> getDepths() {
            Set<Double> depths = new HashSet<Double>();
            Map<String, PolarPoint> polarLocations = radialLayout.getPolarLocations();
            for (String v : graph.getVertices()) {
                PolarPoint pp = polarLocations.get(v);
                depths.add(pp.getRadius());
            }
            return depths;
        }

        public void paint(Graphics g) {
            g.setColor(Color.lightGray);

            Graphics2D g2d = (Graphics2D) g;
            Point2D center = radialLayout.getCenter();

            Ellipse2D ellipse = new Ellipse2D.Double();
            for (double d : depths) {
                ellipse.setFrameFromDiagonal(center.getX() - d, center.getY() - d, center.getX() +
                    d, center.getY() + d);
                Shape shape =
                    vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.LAYOUT)
                        .transform(ellipse);
                g2d.draw(shape);
            }
        }

        public boolean useTransform() {
            return true;
        }
    }

    /**
     * @param taskTree
     * 
     */
    private void createTree(ITaskTreeNode node) {
        Queue<ITaskTreeNode> unvisitedNodes = new LinkedList<ITaskTreeNode>();
        unvisitedNodes.add(node);
        while (stillUnvisitedNodes(unvisitedNodes)) {
            ITaskTreeNode node2 = unvisitedNodes.poll();
            graph.addVertex(node2.toString());
            for (ITaskTreeNode child : node2.getChildren()) {
                graph.addEdge(edgeFactory.create(), node2.toString(), child.toString());
                unvisitedNodes.add(child);
            }
        }
    }

    private boolean stillUnvisitedNodes(Queue<ITaskTreeNode> unvisitedNodes) {
        return !unvisitedNodes.isEmpty();
    }

    /**
     * a demo class that will create a vertex shape that is either a polygon or star. The number of
     * sides corresponds to the number of vertices that were collapsed into the vertex represented
     * by this shape.
     * 
     * @author Tom Nelson
     * 
     * @param <V>
     */
    class ClusterVertexShapeFunction<V> extends EllipseVertexShapeTransformer<V> {

        ClusterVertexShapeFunction() {
            setSizeTransformer(new ClusterVertexSizeFunction<V>(20));
        }

        @Override
        public Shape transform(V v) {
            if (v instanceof Graph) {
                int size = ((Graph<?, ?>) v).getVertexCount();
                if (size < 8) {
                    int sides = Math.max(size, 3);
                    return factory.getRegularPolygon(v, sides);
                }
                else {
                    return factory.getRegularStar(v, size);
                }
            }
            return super.transform(v);
        }
    }

    /**
     * A demo class that will make vertices larger if they represent a collapsed collection of
     * original vertices
     * 
     * @author Tom Nelson
     * 
     * @param <V>
     */
    class ClusterVertexSizeFunction<V> implements Transformer<V, Integer> {
        int size;

        public ClusterVertexSizeFunction(Integer size) {
            this.size = size;
        }

        public Integer transform(V v) {
            if (v instanceof Graph) {
                return 30;
            }
            return size;
        }
    }
}