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package org.jungrapht.samples.sugiyama;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.util.stream.IntStream;
import javax.swing.*;
import org.jgrapht.Graph;
import org.jgrapht.graph.builder.GraphTypeBuilder;
import org.jgrapht.util.SupplierUtil;
import org.jungrapht.visualization.VisualizationViewer;
import org.jungrapht.visualization.decorators.EdgeShape;
import org.jungrapht.visualization.layout.algorithms.SugiyamaLayoutAlgorithm;
import org.jungrapht.visualization.renderers.Renderer;

/**
 * Fast and Simple Horizontal Coordinate Assignment by Ulrik Brandes and Boris Köpf on page 39,
 * shows four horizontal coordinate assignments, plus the average median. This demo creates the
 * graph from that paper, hard-codes the layer assignment, and runs the horizontal coordinate
 * assignment to confirm that the results look like those depicted in the paper. This is a visual
 * check of the correctness of the code for the HorizontalCoordinate assignment algorithm
 *
 * @author Tom Nelson
 */
public class BrandesKopfSugiyamaGraphExample extends JFrame {

  public BrandesKopfSugiyamaGraphExample() {

    JPanel container = new JPanel(new BorderLayout());

    Graph graph = createInitialGraph();

    VisualizationViewer vv = configureVisualizationViewer(graph);

    SugiyamaLayoutAlgorithm layoutAlgorithm =
        SugiyamaLayoutAlgorithm.edgeAwareBuilder().build();
    layoutAlgorithm.setVertexBoundsFunction(vv.getRenderContext().getVertexBoundsFunction());
    vv.getVisualizationModel().setLayoutAlgorithm(layoutAlgorithm);

    container.add(vv.getComponent());

    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    add(container);
    pack();
    setVisible(true);
  }

  private VisualizationViewer configureVisualizationViewer(
      Graph graph) {
    VisualizationViewer vv =
        VisualizationViewer.builder(graph)
            .layoutSize(new Dimension(600, 600))
            .viewSize(new Dimension(600, 600))
            .build();

    vv.getRenderContext().setEdgeShapeFunction(EdgeShape.line());
    vv.setVertexToolTipFunction(Object::toString);
    vv.getRenderContext().setArrowFillPaintFunction(n -> Color.lightGray);

    vv.getRenderContext().setVertexLabelPosition(Renderer.VertexLabel.Position.CNTR);
    vv.getRenderContext().setVertexLabelDrawPaintFunction(c -> Color.white);
    vv.getRenderContext().setVertexLabelFunction(Object::toString);
    vv.getRenderContext().setVertexLabelPosition(Renderer.VertexLabel.Position.CNTR);
    return vv;
  }

  /**
   * creates a graph to look like the one in the paper
   *
   * @return
   */
  Graph createInitialGraph() {

    Graph graph =
        GraphTypeBuilder.directed()
            .edgeSupplier(SupplierUtil.createIntegerSupplier())
            .vertexSupplier(SupplierUtil.createIntegerSupplier())
            .buildGraph();

    IntStream.rangeClosed(1, 23).forEach(graph::addVertex);
    graph.addEdge(1, 3);
    graph.addEdge(1, 4);
    graph.addEdge(1, 13);
    graph.addEdge(1, 21);

    graph.addEdge(2, 3);
    graph.addEdge(2, 20);

    graph.addEdge(3, 4);
    graph.addEdge(3, 5);
    graph.addEdge(3, 23);

    graph.addEdge(4, 6);

    graph.addEdge(5, 7);

    graph.addEdge(6, 8);
    graph.addEdge(6, 16);
    graph.addEdge(6, 23);

    graph.addEdge(7, 9);

    graph.addEdge(8, 10);
    graph.addEdge(8, 11);

    graph.addEdge(9, 12);

    graph.addEdge(10, 13);
    graph.addEdge(10, 14);
    graph.addEdge(10, 15);

    graph.addEdge(11, 15);
    graph.addEdge(11, 16);

    graph.addEdge(12, 20);

    graph.addEdge(13, 17);

    graph.addEdge(14, 17);
    graph.addEdge(14, 18);
    // no 15 targets

    graph.addEdge(16, 18);
    graph.addEdge(16, 19);
    graph.addEdge(16, 20);

    graph.addEdge(18, 21);

    graph.addEdge(19, 22);

    graph.addEdge(21, 23);

    graph.addEdge(22, 23);
    return graph;
  }

  public static void main(String[] args) {
    new BrandesKopfSugiyamaGraphExample();
  }
}