/*
Copyright (C) 2001, 2006 United States Government
as represented by the Administrator of the
National Aeronautics and Space Administration.
All Rights Reserved.
*/
package gov.nasa.worldwind.layers;

import gov.nasa.worldwind.avlist.AVKey;
import gov.nasa.worldwind.avlist.AVList;
import gov.nasa.worldwind.avlist.AVListImpl;
import gov.nasa.worldwind.awt.WorldWindowGLCanvas;
import gov.nasa.worldwind.geom.Angle;
import gov.nasa.worldwind.geom.LatLon;
import gov.nasa.worldwind.geom.Sector;
import gov.nasa.worldwind.globes.ElevationModel;
import gov.nasa.worldwind.globes.Globe;
import gov.nasa.worldwind.util.LevelSet;

import java.awt.*;
import java.awt.image.BufferedImage;

/**
 * Procedural layer example
 * @author Patrick Murris
 * @version $Id:$
 */
public class ProceduralTestLayer extends ProceduralTiledImageLayer
{
    public ProceduralTestLayer()
    {
        super(makeLevels());
        this.setUseTransparentTextures(true);
    }

    private static LevelSet makeLevels()
    {
        AVList params = new AVListImpl();

        params.setValue(AVKey.TILE_WIDTH, 128);
        params.setValue(AVKey.TILE_HEIGHT, 128);
        params.setValue(AVKey.DATA_CACHE_NAME, "Tests/ProceduralTests");
        params.setValue(AVKey.SERVICE, "*");
        params.setValue(AVKey.DATASET_NAME, "*");
        params.setValue(AVKey.FORMAT_SUFFIX, ".png");
        params.setValue(AVKey.NUM_LEVELS, 10);
        params.setValue(AVKey.NUM_EMPTY_LEVELS, 4);
        params.setValue(AVKey.LEVEL_ZERO_TILE_DELTA, new LatLon(Angle.fromDegrees(36d), Angle.fromDegrees(36d)));
        params.setValue(AVKey.SECTOR, Sector.FULL_SPHERE);

        return new LevelSet(params);
    }

    private WorldWindowGLCanvas wwd;

    public void setWwd(WorldWindowGLCanvas wwd)
    {
        this.wwd = wwd;
    }

    protected BufferedImage createTileImage(TextureTile tile, BufferedImage image)
    {
        int width = tile.getLevel().getTileWidth();
        int height = tile.getLevel().getTileHeight();
        Graphics2D g2 = image.createGraphics();
        if (this.wwd != null)
        {
            Globe globe = this.wwd.getModel().getGlobe();
            double latStep = tile.getSector().getDeltaLatDegrees() / height;
            double lonStep = tile.getSector().getDeltaLonDegrees() / width;

            // Paint elevations in different colors
            for (int x = 0; x < width; x++)
            {
                double lon = tile.getSector().getMinLongitude().degrees + lonStep * x + lonStep / 2;
                for (int y = 0; y < height; y++)
                {
                    double lat = tile.getSector().getMaxLatitude().degrees - latStep * y - latStep / 2;
                    double el = globe.getElevation(Angle.fromDegrees(lat), Angle.fromDegrees(lon));
                    float hue = (float)((el  - globe.getMinElevation()) / (globe.getMaxElevation() - globe.getMinElevation()));
                    hue = (10 * hue) % 1;
                    image.setRGB(x, y, Color.HSBtoRGB(hue, 1f, 1f));
                }
            }
        }
        else
        {
            // Draw a red cross on white background
            g2.setPaint(Color.WHITE);
            g2.fillRect(0, 0, width, height);
            g2.setPaint(Color.RED);
            g2.drawLine(0, 0, width , height);
            g2.drawLine(0, height, width , 0);
        }
        return image;
    }

    @Override
    public String toString()
    {
        return "Procedural Test Layer";
    }
}