/**

 * 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.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;

        }

    }

    /**

     * An RGB color

     */

    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);

        }

        /**

         * Get the X coordinate of the Gradients start point

         *

         * @return x coordinate

         */

        public double getX0() {

            return x0;

        }

        /**

         * Set the X coordinate of the Gradients start point

         *

         * @param x0 x coordinate

         */

        public void setX0(double x0) {

            this.x0 = x0;

        }

        /**

         * Get the Y coordinate of the Gradients start point

         *

         * @return y coordinate

         */

        public double getY0() {

            return y0;

        }

        /**

         * Set the Y coordinate of the Gradients start point

         *

         * @param y0 y coordinate

         */

        public void setY0(double y0) {

            this.y0 = y0;

        }

        /**

         * Set the X coordinate of the Gradients end point

         *

         * @return x coordinate

         */

        public double getX1() {

            return x1;

        }

        /**

         * Set the X coordinate of the Gradients end point

         *

         * @param X coordinate

         */

        public void setX1(double x1) {

            this.x1 = x1;

        }

        /**

         * Get the Y coordinate of the Gradients end point

         *

         * @return y coordinate

         */

        public double getY1() {

            return y1;

        }

        /**

         * Set the Y coordinate of the Gradients end point

         *

         * @param y1 coordinate

         */

        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;

        }

    }

    /**

     * A Radial Gradient. Radial gradients are defined with two imaginary

     * circles, a starting circle and an ending circle. The gradient starts with

     * the start circle and moves towards the end circle.

     */

    public static final class RadialGradient extends LinearGradient {

        private double r0, r1;

        /**

         * Create a new RadialGradient

         *

         * @param x0 x Coordinate of starting circle

         * @param y0 y Coordinate of starting circle

         * @param r0 radius of starting circle

         * @param x1 x coordinate of ending circle

         * @param y1 y coordinate of ending circle

         * @param r1 radius of ending circle

         */

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

            super(x0, y0, x1, y1);

            this.r0 = r0;

            this.r1 = r1;

        }

        /**

         * get the radius of the start circle.

         * @return the radius

         */

        public double getR0() {

            return r0;

        }

        /**

         * set the radius of the start circle.

         * @param r0 the radius

         */

        public void setR0(double r0) {

            this.r0 = r0;

        }

        /**

         * get the radius of the end circle

         * @return the radius

         */

        public double getR1() {

            return r1;

        }

        /**

         * set the radius of the end circle.

         * @param r1 the radius.

         */

        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;

        }

    }

}