/**

  * Back 2 Browser Bytecode Translator

  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, version 2 of the License.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program. Look for COPYING file in the top folder.

  * If not, see http://opensource.org/licenses/GPL-2.0.

  */

 package net.java.html.canvas;

 import java.util.Collection;

 import java.util.HashMap;

 import java.util.Objects;

 /**

  * Style for Stroke and Fill of GraphicsContext. Styles are created using

  * GraphicsContexts factory methods. If the Implementation supports it, native

  * Styles will be cached for performance reasons. This happens the first time

  * the Style is actually used.

  *

  * @author antonepple

  */

 public class Style {

     Object cached;

     private int cacheHash;

     Style() {

     }

     void cache(Object toCache) {

         cacheHash = hashCode();

         this.cached = toCache;

     }

     private boolean isCached() {

         return cacheHash == hashCode();

     }

     Object getCached() {

         return isCached() ? cached : null;

     }

     /**

      * A Fill Pattern using an Image Resource to create a fill style supporting 

      * different repeat styles repeat, repeat-x, repeat-y, or no-repeat. 

      * Default is repeat. 

      */

     public static final class Pattern extends Style {

         private final Image imageResource;

         private final String repeat;

         /**

          * 

          * @param imageResource the base image of thsi pattern

          * @param repeat the repeat pattern, possible values are repeat, repeat-x, repeat-y, or no-repeat.

          */

         public Pattern(Image imageResource, String repeat) {

             this.imageResource = imageResource;

             this.repeat = repeat;

         }

         /**

          * Get the base image of this pattern

          * @return the base image of this pattern

          */

         public Image getImageResource() {

             return imageResource;

         }

         /**

          * Get the repeat style for this pattern

          * @return return the repeat style

          */

         public String getRepeat() {

             return repeat;

         }

     }

     public static final class Color extends Style {

         private String web;

         /**

          * Creates an RGB color specified with an HTML or CSS attribute string.

          *

          * @param webColor Color defined as web color (e.g. #ff0000)

          */

         public Color(String webColor) {

             this.web = webColor;

         }

         /**

          * 

          * 

          * @return the Color value as a Web Color (e.g. #ff0000)

          */

         public String getAsString() {

             return web;

         }

     }

     /**

      * A Linear Gradient. The GRadient has a direction defined by two coordinates

      * and stops defining the Color at a specific position.

      */

     public static class LinearGradient extends Style {

         private HashMap<Double, String> stops;

         private double x0, y0, x1, y1;

         /**

          * 

          * @param x0 the x coordinate of the start point for this gradient

          * @param y0 the y coordinate of the start point for this gradient

          * @param x1 the x coordinate of the end point for this gradient

          * @param y1 the y coordinate of the end point for this gradient

          */

         LinearGradient(double x0, double y0, double x1, double y1) {

             this.x0 = x0;

             this.y0 = y0;

             this.x1 = x1;

             this.y1 = y1;

         }

         /**

          * Add a new Color stop. A color stop defines a fixed color at a position

          * along the coordinates.

          * @param position the position of this stop in percent [0.0-1.0]

          * @param color A Color defined in web format (e.g. #ff0000) 

          */

         void addColorStop(double position, String color) {

             if (stops == null) {

                 stops = new HashMap<>();

             }

             stops.put(position, color);

         }

         /**

          * Get the stops of this gradient. 

          * @return the stops of this gradient

          */

         public HashMap<Double, String> getStops(){

             return new HashMap<>(stops);

         }

         /**

          * Set the stops as Position/Color pairs 

          * @param stops the stops for thsi Gradient

          */

         public void setStops(HashMap<Double, String> stops) {     

             this.stops = new HashMap<>(stops);

         }

         public double getX0() {

             return x0;

         }

         public void setX0(double x0) {

             this.x0 = x0;

         }

         public double getY0() {

             return y0;

         }

         public void setY0(double y0) {

             this.y0 = y0;

         }

         public double getX1() {

             return x1;

         }

         public void setX1(double x1) {

             this.x1 = x1;

         }

         public double getY1() {

             return y1;

         }

         public void setY1(double y1) {

             this.y1 = y1;

         }

         @Override

         public int hashCode() {

             int hash = 7;

             hash = 29 * hash + Objects.hashCode(this.stops);

             hash = 29 * hash + (int) (Double.doubleToLongBits(this.x0) ^ (Double.doubleToLongBits(this.x0) >>> 32));

             hash = 29 * hash + (int) (Double.doubleToLongBits(this.y0) ^ (Double.doubleToLongBits(this.y0) >>> 32));

             hash = 29 * hash + (int) (Double.doubleToLongBits(this.x1) ^ (Double.doubleToLongBits(this.x1) >>> 32));

             hash = 29 * hash + (int) (Double.doubleToLongBits(this.y1) ^ (Double.doubleToLongBits(this.y1) >>> 32));

             return hash;

         }

         @Override

         public boolean equals(Object obj) {

             if (obj == null) {

                 return false;

             }

             if (getClass() != obj.getClass()) {

                 return false;

             }

             final LinearGradient other = (LinearGradient) obj;

             if (!Objects.equals(this.stops, other.stops)) {

                 return false;

             }

             if (Double.doubleToLongBits(this.x0) != Double.doubleToLongBits(other.x0)) {

                 return false;

             }

             if (Double.doubleToLongBits(this.y0) != Double.doubleToLongBits(other.y0)) {

                 return false;

             }

             if (Double.doubleToLongBits(this.x1) != Double.doubleToLongBits(other.x1)) {

                 return false;

             }

             if (Double.doubleToLongBits(this.y1) != Double.doubleToLongBits(other.y1)) {

                 return false;

             }

             return true;

         }

     }

     public static final class RadialGradient extends LinearGradient {

         private double r0, r1;

         RadialGradient(double x0, double y0, double r0, double x1, double y1, double r1) {

             super(x0, y0, x1, y1);

             this.r0 = r0;

             this.r1 = r1;

         }

         public double getR0() {

             return r0;

         }

         public void setR0(double r0) {

             this.r0 = r0;

         }

         public double getR1() {

             return r1;

         }

         public void setR1(double r1) {

             this.r1 = r1;

         }

         @Override

         public int hashCode() {

             int hash = super.hashCode();

             hash = 17 * hash + (int) (Double.doubleToLongBits(this.r0) ^ (Double.doubleToLongBits(this.r0) >>> 32));

             hash = 17 * hash + (int) (Double.doubleToLongBits(this.r1) ^ (Double.doubleToLongBits(this.r1) >>> 32));

             return hash;

         }

         @Override

         public boolean equals(Object obj) {

             if (obj == null) {

                 return false;

             }

             if (getClass() != obj.getClass()) {

                 return false;

             }

             if (!super.equals(obj)) {

                 return false;

             }

             final RadialGradient other = (RadialGradient) obj;

             if (Double.doubleToLongBits(this.r0) != Double.doubleToLongBits(other.r0)) {

                 return false;

             }

             if (Double.doubleToLongBits(this.r1) != Double.doubleToLongBits(other.r1)) {

                 return false;

             }

             if ((this.getCached() == null) != (other.getCached() == null)) {

                 return false;

             }

             return true;

         }

     }

 }