/**
 * Copyright (c) 2011, The University of Southampton and the individual contributors.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *   *  Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *
 *   *  Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *
 *   *  Neither the name of the University of Southampton nor the names of its
 *      contributors may be used to endorse or promote products derived from this
 *      software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.openimaj.demos.acmmm11.presentation.slides;


import org.openimaj.image.MBFImage;
import org.openimaj.image.colour.RGBColour;
import org.openimaj.image.processing.transform.MBFProjectionProcessor;
import org.openimaj.math.geometry.transforms.TransformUtilities;
import org.openimaj.video.Video;

import Jama.Matrix;

/**
 * A video based on a still image that is animated by 
 * spinning around its centre. 
 * 
 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
 */
public class SpinningImageVideo extends Video<MBFImage> {
        private double wh;
        private MBFImage canvas;
        private long startTime;
        private float step;
        private MBFImage image;
        private Matrix translate;
        private boolean hasNextFrame = true;
        private float start;
        private MBFImage lastFrame = null;
        private float oldStep;
        private boolean isPaused;
        
        /**
         * Default constructor.
         * 
         * @param image The image to spin.
         * @param start Starting angle.
         * @param step Step angle between frames.
         */
        public SpinningImageVideo(MBFImage image, float start, float step) {
                this.wh = Math.sqrt(image.getWidth()*image.getWidth() + image.getHeight() * image.getHeight());
                canvas = image.newInstance((int)wh, (int)wh);
                lastFrame = canvas;
                this.image = image;
                startTime = System.currentTimeMillis();
                this.step = step;
                this.start = start;
                
                translate = TransformUtilities.translateToPointMatrix(image.getBounds().calculateCentroid(), canvas.getBounds().calculateCentroid());
        }

        @Override
        public MBFImage getNextFrame() {
                canvas.fill(RGBColour.BLACK);
                double timePerFrame = 1000 / getFPS();
                double frame = getTimeStamp() / timePerFrame;
                double angle = start + (step * frame);
                int midx = image.getWidth()/2;
                int midy = image.getHeight()/2;
                Matrix spin = TransformUtilities.rotationMatrixAboutPoint(angle, midx, midy);
                
                MBFProjectionProcessor pp = new MBFProjectionProcessor();
                pp.setMatrix(translate.times(spin));
                pp.accumulate(image);
                pp.performProjection(0, 0, canvas);
                this.lastFrame  = canvas;
                return canvas;
        }

        @Override
        public MBFImage getCurrentFrame() {
                return lastFrame;
        }

        @Override
        public int getWidth() {
                return canvas.getWidth();
        }

        @Override
        public int getHeight() {
                return canvas.getHeight();
        }

        @Override
        public long getTimeStamp() {
                long ellapsed = System.currentTimeMillis() - startTime;
                return ellapsed;
        }

        @Override
        public double getFPS() {
                return 30;
        }

        @Override
        public boolean hasNextFrame() {
                return hasNextFrame ;
        }

        @Override
        public long countFrames() {
                return -1;
        }

        @Override
        public void reset() {
                this.startTime = System.currentTimeMillis();
        }

        /**
         * Stop the video
         */
        public void stop() {
                this.hasNextFrame = true;
        }

        /**
         * Adjust the speed
         * @param f frame rate increment
         */
        public void adjustSpeed(float f) {
                if(isPaused) return;
                double timePerFrame = 1000 / getFPS();
                double frame = getTimeStamp() / timePerFrame;
                double angle = start + (step * frame);
                this.start = (float) angle;
                this.startTime = System.currentTimeMillis();
                this.step +=f;
        }
        
        /**
         * Pause or unpause the video
         */
        public void togglePause() {
                if(this.step!=0){
                        this.oldStep = this.step;
                        this.isPaused = true;
                        double timePerFrame = 1000 / getFPS();
                        double frame = getTimeStamp() / timePerFrame;
                        double angle = start + (step * frame);
                        this.start = (float) angle;
                        this.step = 0;
                        
                }
                else{
                        this.isPaused = false;
                        this.step = this.oldStep;
                        this.startTime = System.currentTimeMillis();
                }
        }

}