/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
 * This code is licensed under the GPL 2.0 license, available at the root
 * application directory.
 */
package org.geoserver.test;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.InputStream;

import javax.imageio.ImageIO;

import junit.framework.Test;

import org.geoserver.test.NamespaceTestData;

public class WmsGetMapTest extends AbstractAppSchemaWfsTestSupport {

    public WmsGetMapTest() throws Exception {
        super();
    }

    /**
     * Read-only test so can use one-time setup.
     * 
     * @return
     */
    public static Test suite() {
        try {
            return new OneTimeTestSetup(new WmsGetMapTest());
        } catch (Exception e) {
            return null;
        }
    }

    @Override
    protected NamespaceTestData buildTestData() {
        WmsSupportMockData mockData = new WmsSupportMockData();
        mockData.addStyle("Default", "styles/Default.sld");
        mockData.addStyle("outcropcharacter", "styles/outcropcharacter.sld");
        mockData.addStyle("positionalaccuracy", "styles/positionalaccuracy.sld");
        return mockData;
    }
     
    public void testGetMapOutcropCharacter() throws Exception
    {
        InputStream is = getBinary("wms?request=GetMap&SRS=EPSG:4326&layers=gsml:MappedFeature&styles=outcropcharacter&BBOX=-2,52,0,54&X=0&Y=0&width=20&height=20&FORMAT=image/jpeg");
        BufferedImage imageBuffer = ImageIO.read(is);
        
        assertNotBlank("app-schema test getmap outcrop character", imageBuffer, Color.WHITE);                
    }
    
    public void testGetMapPositionalAccuracy() throws Exception
    {
        InputStream is = getBinary("wms?request=GetMap&SRS=EPSG:4326&layers=gsml:MappedFeature&styles=positionalaccuracy&BBOX=-2,52,0,54&X=0&Y=0&width=20&height=20&FORMAT=image/jpeg");
        BufferedImage imageBuffer = ImageIO.read(is);
        
        assertNotBlank("app-schema test getmap positional accuracy", imageBuffer, Color.WHITE);
        
        /*DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(new File("/home/niels/Desktop/temp"))));
        int data;
        while((data = is.read()) >= 0) {
                out.writeByte(data);
        }
        is.close();
        out.close();*/
    }  
    
    /**
     * Asserts that the image is not blank, in the sense that there must be pixels different from
     * the passed background color.
     * 
     * @param testName
     *            the name of the test to throw meaningfull messages if something goes wrong
     * @param image
     *            the imgage to check it is not "blank"
     * @param bgColor
     *            the background color for which differing pixels are looked for
     */
    protected void assertNotBlank(String testName, BufferedImage image, Color bgColor) {
        int pixelsDiffer = countNonBlankPixels(testName, image, bgColor);
        assertTrue(testName + " image is comlpetely blank", 0 < pixelsDiffer);
    }
    
    
    /**
     * Counts the number of non black pixels
     * 
     * @param testName
     * @param image
     * @param bgColor
     * @return
     */
    protected int countNonBlankPixels(String testName, BufferedImage image, Color bgColor) {
        int pixelsDiffer = 0;

        for (int y = 0; y < image.getHeight(); y++) {
            for (int x = 0; x < image.getWidth(); x++) {
                if (image.getRGB(x, y) != bgColor.getRGB()) {
                    ++pixelsDiffer;
                }
            }
        }

        LOGGER.fine(testName + ": pixel count=" + (image.getWidth() * image.getHeight())
                + " non bg pixels: " + pixelsDiffer);
        return pixelsDiffer;
    }

}