package com.srbenoit.math.delaunay;

import java.awt.BorderLayout;
import java.lang.reflect.InvocationTargetException;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import com.srbenoit.ui.UIUtilities;

/**
 * A viewer that will display the that can show a visualization of the triangulation.
 */
public class DelaunayViewer implements DelaunayVisualizerInt, Runnable {

    /** flag that controls whether we pause after each step */
    private static final boolean PAUSE = false;

    /** the panel that will display the triangulation */
    private DelaunayPanel panel;

    /** a label that will show the description of the phase just completed */
    private JLabel label;

    /**
     * Constructs a new <code>DelaunayViewer</code>.
     *
     * @throws  InvocationTargetException  if there is an error constructing the interface
     * @throws  InterruptedException       if there is an interruption while constructing the
     *                                     interface
     */
    public DelaunayViewer() throws InterruptedException, InvocationTargetException {

        SwingUtilities.invokeAndWait(this);
    }

    /**
     * Notifies that another step in the process has completed, and visualization can be updated.
     * Processing will not continue until this method returns, allowing a visualizer to show a
     * slow, step-by-step process.
     *
     * @param  points  the list of points being triangulated
     * @param  sub     the subdivision to draw
     * @param  phase   a string description of the phase just completed
     */
    public void update(final Vertex[] points, final Delaunay sub, final String phase) {

        this.label.setText(phase);
        this.panel.update(points, sub);

        if (PAUSE) {

            while (this.panel.isVisible()) {

                synchronized (this) {

                    try {
                        wait(1000);
                    } catch (InterruptedException e) {
                        // No action
                    }
                }
            }
        }
    }

    /**
     * Constructs the user interface in the AWT event dispatcher thread.
     */
    public void run() {

        JFrame frame;
        JPanel content;

        frame = new JFrame();
        frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

        content = new JPanel(new BorderLayout());
        frame.setContentPane(content);

        this.panel = new DelaunayPanel();
        content.add(this.panel, BorderLayout.CENTER);

        this.label = new JLabel("Initializing...");
        content.add(this.label, BorderLayout.NORTH);

        frame.pack();
        UIUtilities.positionFrame(frame, 0.5, 0.1);
        frame.setVisible(true);
    }
}