/*
 *  ====================================================================
 *    Licensed to the Apache Software Foundation (ASF) under one or more
 *    contributor license agreements.  See the NOTICE file distributed with
 *    this work for additional information regarding copyright ownership.
 *    The ASF licenses this file to You under the Apache License, Version 2.0
 *    (the "License"); you may not use this file except in compliance with
 *    the License.  You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 * ====================================================================
 */
package org.apache.poi.sl.draw;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assume.assumeFalse;

import java.awt.Dimension;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.InputStream;

import org.apache.poi.POIDataSamples;
import org.apache.poi.sl.usermodel.PictureData;
import org.apache.poi.sl.usermodel.PictureShape;
import org.apache.poi.sl.usermodel.RectAlign;
import org.apache.poi.sl.usermodel.Shape;
import org.apache.poi.sl.usermodel.Slide;
import org.apache.poi.sl.usermodel.SlideShow;
import org.apache.poi.sl.usermodel.SlideShowFactory;
import org.apache.poi.util.Units;
import org.junit.BeforeClass;
import org.junit.Test;

public class TestDrawPictureShape {
    final static POIDataSamples ssSamples = POIDataSamples.getSlideShowInstance();

    private static boolean xslfOnly = false;

    @BeforeClass
    public static void checkHslf() {
        try {
            Class.forName("org.apache.poi.hslf.usermodel.HSLFSlideShow");
        } catch (Exception e) {
            xslfOnly = true;
        }
    }
    
    /** a generic way to open a sample slideshow document **/
    public static SlideShow<?,?> openSampleDocument(String sampleName) throws IOException {
        InputStream is = ssSamples.openResourceAsStream(sampleName);
        try {
            return SlideShowFactory.create(is);
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            is.close();
        }
    }

    @Test
    public void testResizeHSLF() throws IOException {
        assumeFalse(xslfOnly);
        testResize("pictures.ppt");
    }
    
    @Test
    public void testResizeXSLF() throws IOException {
        testResize("shapes.pptx");
    }
    
        
    public void testResize(String file) throws IOException {
        SlideShow<?,?> ss = openSampleDocument(file);
        
        Slide<?,?> slide = ss.getSlides().get(0);
        PictureShape<?,?> picShape = null;
        for (Shape<?,?> shape : slide.getShapes()) {
            if (shape instanceof PictureShape) {
                picShape = (PictureShape<?,?>)shape;
                break;
            }
        }
        assertNotNull(picShape);
        PictureData pd = picShape.getPictureData();
        Dimension dimPd = pd.getImageDimension();
        new DrawPictureShape(picShape).resize();
        Dimension dimShape = new Dimension(
            (int)picShape.getAnchor().getWidth(),
            (int)picShape.getAnchor().getHeight()
        );
        assertEquals(dimPd, dimShape);
        
        double newWidth = (dimPd.getWidth()*(100d/dimPd.getHeight()));
        // ... -1 is a rounding error
        Rectangle2D expRect = new Rectangle2D.Double(rbf(50+300-newWidth, picShape), 50, rbf(newWidth, picShape), 100);
        Rectangle2D target = new Rectangle2D.Double(50,50,300,100);
        new DrawPictureShape(picShape).resize(target, RectAlign.BOTTOM_RIGHT);
        Rectangle2D actRect = picShape.getAnchor();
        assertEquals(expRect.getX(), actRect.getX(), .0001);
        assertEquals(expRect.getY(), actRect.getY(), .0001);
        assertEquals(expRect.getWidth(), actRect.getWidth(), .0001);
        assertEquals(expRect.getHeight(), actRect.getHeight(), .0001);
        ss.close();
    }
    
    // round back and forth - points -> master -> points
    static double rbf(double val, PictureShape<?,?> picShape) {
        if (picShape.getClass().getName().contains("HSLF")) {
            return Units.masterToPoints(Units.pointsToMaster(val));
        } else {
            return val;
        }
    }
}