/**

 * 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 net.java.html.canvas.Style.Color;

import net.java.html.canvas.Style.LinearGradient;

import net.java.html.canvas.Style.Pattern;

import net.java.html.canvas.Style.RadialGradient;

import net.java.html.canvas.spi.GraphicsEnvironment;

import org.apidesign.html.canvas.impl.CnvsAccssr;

/**

 * A 2D Graphics Context similar to HTML5 or JavaFX GraphicsContext. Use this to

 * paint on your Canvas

 *

 * @author antonepple

 */

public final class GraphicsContext {

    public static void getAccssr() {

        // do nothing

    }

    GraphicsEnvironment graphicsEnvironmentImpl;

    static {

        CnvsAccssr cnvsAccssr = new CnvsAccssr() {

            @Override

            public GraphicsContext create(GraphicsEnvironment environment) {

                return new GraphicsContext(environment);

            }

        };

    }

    GraphicsContext(GraphicsEnvironment graphicsEnvironment) {

        this.graphicsEnvironmentImpl = graphicsEnvironment;

    }

    /**

     * Adds path elements to the current path to make an arc.

     *

     * @param centerX the center x position of the arc.

     * @param centerY the center y position of the arc.

     * @param radius the radius of the arc.

     * @param endAngle teh endAngle of the arc

     * @param ccw the direction of the arc (counterclockwise)

     */

    public void arc(double centerX,

            double centerY,

            double startAngle,

            double radius,

            double endAngle,

            boolean ccw) {

        graphicsEnvironmentImpl.arc(centerX, centerY, startAngle, radius, endAngle, ccw);

    }

    /**

     * Adds segments to the current path to make an arc.

     *

     * @param x1 the X coordinate of the first point of the arc.

     * @param y1 the Y coordinate of the first point of the arc.

     * @param x2 the X coordinate of the second point of the arc.

     * @param y2 the Y coordinate of the second point of the arc.

     * @param radius the radius of the arc in the range {0.0-positive infinity}.

     */

    public void arcTo(double x1,

            double y1,

            double x2,

            double y2,

            double radius) {

        graphicsEnvironmentImpl.arcTo(x1, y1, x2, y2, radius);

    }

    /**

     * Returns true if the the given x,y point is inside the path.

     *

     * @param x the X coordinate to use for the check.

     * @param y the Y coordinate to use for the check.

     * @return true if the point given is inside the path, false otherwise.

     */

    public boolean isPointInPath(double x, double y) {

        return graphicsEnvironmentImpl.isPointInPath(x, y);

    }

    /**

     * Fills the path with the current fill paint.

     */

    public void fill() {

        graphicsEnvironmentImpl.fill();

    }

    /**

     * Strokes the path with the current stroke paint.

     */

    public void stroke() {

        graphicsEnvironmentImpl.stroke();

    }

    /**

     * Starts a Path

     */

    public void beginPath() {

        graphicsEnvironmentImpl.beginPath();

    }

    /**

     * Closes the path.

     */

    public void closePath() {

        graphicsEnvironmentImpl.closePath();

    }

    /**

     * Clips using the current path

     */

    public void clip() {

        graphicsEnvironmentImpl.clip();

    }

    /**

     * Issues a move command for the current path to the given x,y coordinate.

     *

     * @param x0 the X position for the move to command.

     * @param y0 the Y position for the move to command.

     */

    public void moveTo(double x, double y) {

        graphicsEnvironmentImpl.moveTo(x, y);

    }

    /**

     * Adds segments to the current path to make a line at the given x,y

     * coordinate.

     *

     * @param x1 the X coordinate of the ending point of the line.

     * @param y1 the Y coordinate of the ending point of the line.

     */

    public void lineTo(double x, double y) {

        graphicsEnvironmentImpl.lineTo(x, y);

    }

    /**

     * Adds segments to the current path to make a quadratic curve.

     *

     * @param cpx the X coordinate of the control point

     * @param cpy the Y coordinate of the control point

     * @param x the X coordinate of the end point

     * @param y the Y coordinate of the end point

     */

    public void quadraticCurveTo(double cpx, double cpy, double x, double y) {

        graphicsEnvironmentImpl.quadraticCurveTo(cpx, cpy, x, y);

    }

    /**

     * Adds segments to the current path to make a cubic bezier curve.

     *

     * @param cp1x the X coordinate of first bezier control point.

     * @param cp1y the Y coordinate of the first bezier control point.

     * @param cp2x the X coordinate of the second bezier control point.

     * @param cp2y the Y coordinate of the second bezier control point.

     * @param x the X coordinate of the end point.

     * @param y the Y coordinate of the end point.

     */

    public void bezierCurveTo(double cp1x, double cp1y, double cp2x, double cp2y, double x, double y) {

        graphicsEnvironmentImpl.bezierCurveTo(cp1x, cp1y, cp2x, cp2y, x, y);

    }

    /**

     * Fills a rectangle using the current fill paint.

     *

     * @param x the X position of the upper left corner of the rectangle.

     * @param y the Y position of the upper left corner of the rectangle.

     * @param w the width of the rectangle.

     * @param h the height of the rectangle.

     */

    public void fillRect(double x, double y, double width, double height) {

        graphicsEnvironmentImpl.fillRect(x, y, width, height);

    }

    /**

     * Strokes a rectangle using the current stroke paint.

     *

     * @param x the X position of the upper left corner of the rectangle.

     * @param y the Y position of the upper left corner of the rectangle.

     * @param width the width of the rectangle.

     * @param height the height of the rectangle.

     */

    public void strokeRect(double x, double y, double width, double height) {

        graphicsEnvironmentImpl.strokeRect(x, y, width, height);

    }

    /**

     * Clears a portion of the canvas with a transparent color value.

     *

     * @param x X position of the upper left corner of the rectangle.

     * @param y Y position of the upper left corner of the rectangle.

     * @param width width of the rectangle.

     * @param height height of the rectangle.

     */

    public void clearRect(double x, double y, double width, double height) {

        graphicsEnvironmentImpl.clearRect(x, y, width, height);

    }

    /**

     * Clears a portion of the canvas with a transparent color value.

     *

     * @param x X position of the upper left corner of the rectangle.

     * @param y Y position of the upper left corner of the rectangle.

     * @param width width of the rectangle.

     * @param height height of the rectangle.

     */

    public void rect(double x, double y, double width, double height) {

        graphicsEnvironmentImpl.rect(x, y, width, height);

    }

    /**

     * Saves the following attributes onto a stack.

     * <ul>

     * <li>Global Alpha</li>

     * <li>Global Blend Operation</li>

     * <li>Transform</li>

     * <li>Fill Paint</li>

     * <li>Stroke Paint</li>

     * <li>Line Width</li>

     * <li>Line Cap</li>

     * <li>Line Join</li>

     * <li>Miter Limit</li>

     * <li>Number of Clip Paths</li>

     * <li>Font</li>

     * <li>Text Align</li>

     * <li>Text Baseline</li>

     * <li>Effect</li>

     * <li>Fill Rule</li>

     * </ul>

     * This method does NOT alter the current state in any way. Also, not that

     * the current path is not saved.

     */

    public void save() {

        graphicsEnvironmentImpl.save();

    }

    /**

     * Pops the state off of the stack, setting the following attributes to

     * their value at the time when that state was pushed onto the stack. If the

     * stack is empty then nothing is changed.

     *

     * <ul>

     * <li>Global Alpha</li>

     * <li>Global Blend Operation</li>

     * <li>Transform</li>

     * <li>Fill Paint</li>

     * <li>Stroke Paint</li>

     * <li>Line Width</li>

     * <li>Line Cap</li>

     * <li>Line Join</li>

     * <li>Miter Limit</li>

     * <li>Number of Clip Paths</li>

     * <li>Font</li>

     * <li>Text Align</li>

     * <li>Text Baseline</li>

     * <li>Effect</li>

     * <li>Fill Rule</li>

     * </ul>

     */

    public void restore() {

        graphicsEnvironmentImpl.restore();

    }

    /**

     * Rotates the current transform in degrees.

     *

     * @param angle value in degrees to rotate the current transform.

     */

    public void rotate(double angle) {

        graphicsEnvironmentImpl.rotate(angle);

    }

    /**

     * Concatenates the input with the current transform.

     *

     * @param mxx - the X coordinate scaling element of the 3x4 matrix

     * @param myx - the Y coordinate shearing element of the 3x4 matrix

     * @param mxy - the X coordinate shearing element of the 3x4 matrix

     * @param myy - the Y coordinate scaling element of the 3x4 matrix

     * @param mxt - the X coordinate translation element of the 3x4 matrix

     * @param myt - the Y coordinate translation element of the 3x4 matrix

     */

    public void transform(double mxx, double myx, double mxy, double myy, double mxt, double myt) {

        graphicsEnvironmentImpl.transform(mxx, myx, mxy, myy, mxt, myt);

    }

    /**

     * Concatenates the input with the current transform.

     *

     * @param mxx - the X coordinate scaling element of the 3x4 matrix

     * @param myx - the Y coordinate shearing element of the 3x4 matrix

     * @param mxy - the X coordinate shearing element of the 3x4 matrix

     * @param myy - the Y coordinate scaling element of the 3x4 matrix

     * @param mxt - the X coordinate translation element of the 3x4 matrix

     * @param myt - the Y coordinate translation element of the 3x4 matrix

     */

    public void setTransform(double mxx, double myx, double mxy, double myy, double mxt, double myt) {

        graphicsEnvironmentImpl.setTransform(mxx, myx, mxy, myy, mxt, myt);

    }

    /**

     * Translates the current transform by x, y.

     *

     * @param x value to translate along the x axis.

     * @param y value to translate along the y axis.

     */

    public void translate(double x, double y) {

        graphicsEnvironmentImpl.translate(x, y);

    }

    /**

     * Scales the current transform by x, y.

     *

     * @param x value to scale in the x axis.

     * @param y value to scale in the y axis.

     */

    public void scale(double x, double y) {

        graphicsEnvironmentImpl.scale(x, y);

    }

    /**

     * Draws an image at the given x, y position using the width and height of

     * the given image.

     *

     * @param img the image to be drawn.

     * @param x the X coordinate on the destination for the upper left of the

     * image.

     * @param y the Y coordinate on the destination for the upper left of the

     * image.

     */

    public void drawImage(Image image, double x, double y) {

        Object nativeImage = graphicsEnvironmentImpl.drawImage(image, x, y, image.getCached());

        image.cache(nativeImage);

    }

    /**

     * Draws an image into the given destination rectangle of the canvas. The

     * Image is scaled to fit into the destination rectagnle.

     *

     * @param img the image to be drawn.

     * @param x the X coordinate on the destination for the upper left of the

     * image.

     * @param y the Y coordinate on the destination for the upper left of the

     * image.

     * @param width the width of the destination rectangle.

     * @param height the height of the destination rectangle.

     */

    public void drawImage(Image image, double x, double y, double width, double height) {

        Object nativeImage = graphicsEnvironmentImpl.drawImage(image, x, y, width, height, image.getCached());

        image.cache(nativeImage);

    }

    /**

     * Draws the current source rectangle of the given image to the given

     * destination rectangle of the Canvas.

     *

     * @param img the image to be drawn.

     * @param sx the source rectangle's X coordinate position.

     * @param sy the source rectangle's Y coordinate position.

     * @param sw the source rectangle's width.

     * @param sh the source rectangle's height.

     * @param dx the destination rectangle's X coordinate position.

     * @param dy the destination rectangle's Y coordinate position.

     * @param dw the destination rectangle's width.

     * @param dh the destination rectangle's height.

     */

    public void drawImage(Image image, double sx, double sy, double sw, double sh, double dx, double dy, double dw, double dh) {

        Object nativeImage = graphicsEnvironmentImpl.drawImage(image, sx, sy, sw, sh, dx, dy, dw, dh, image.getCached());

        image.cache(nativeImage);

    }

    /**

     * Merges two images drawing one on top of the other and returning the

     * result.

     *

     * @param a the lower Image

     * @param b the upper Image

     * @return

     */

    public Image merge(Image a, Image b) {

        if (a.getCached() == null) {

            drawImage(a, 0, 0);

        }

        if (b.getCached() == null) {

            drawImage(b, 0, 0);

        }

        Object nativeImage = graphicsEnvironmentImpl.mergeImages(a, b, a.getCached(), b.getCached());

        Image merged = Image.create("should add real path here");

        merged.cache(nativeImage);

        return merged;

    }

//    public void setShadowColor(String color) {

//        graphicsEnvironmentImpl.setShadowColor(color);

//    }

//

//    public void setShadowBlur(double blur) {

//        graphicsEnvironmentImpl.setShadowBlur(blur);

//    }

//

//    public void setShadowOffsetX(double x) {

//        graphicsEnvironmentImpl.setShadowOffsetX(x);

//    }

//

//    public void setShadowOffsetY(double y) {

//        graphicsEnvironmentImpl.setShadowOffsetY(y);

//    }

//

//    public String getShadowColor() {

//        return graphicsEnvironmentImpl.getShadowColor();

//    }

//

//    public double getShadowBlur() {

//        return graphicsEnvironmentImpl.getShadowBlur();

//    }

//

//    public double getShadowOffsetX() {

//        return graphicsEnvironmentImpl.getShadowOffsetX();

//    }

//

//    public double getShadowOffsetY() {

//        return graphicsEnvironmentImpl.getShadowOffsetY();

//    }

    public String getLineCap() {

        return graphicsEnvironmentImpl.getLineCap();

    }

    public void setLineCap(String style) {

        graphicsEnvironmentImpl.setLineCap(style);

    }

    public String getLineJoin() {

        return graphicsEnvironmentImpl.getLineJoin();

    }

    public void setLineJoin(String style) {

        graphicsEnvironmentImpl.setLineJoin(style);

    }

    public double getLineWidth() {

        return graphicsEnvironmentImpl.getLineWidth();

    }

    public void setLineWidth(double width) {

        graphicsEnvironmentImpl.setLineWidth(width);

    }

    public double getMiterLimit() {

        return graphicsEnvironmentImpl.getMiterLimit();

    }

    public void setMiterLimit(double limit) {

        graphicsEnvironmentImpl.setMiterLimit(limit);

    }

    /**

     * Sets the fill style. Will be used when rendering something, e.g. calling one

     * of the fillText Methods.

     * @param style 

     */

    public void setFillStyle(Style style) {

        Object nativeFillStyle = graphicsEnvironmentImpl.setFillStyle(style, style.getCached());

        style.cache(nativeFillStyle);

    }

    /**

     * get the current font

     *

     * @return current Font. 

     * of the fillText Methods.

     */

    public String getFont() {

        return graphicsEnvironmentImpl.getFont();

    }

    /**

     * Set the Font. Will be used when rendering Text, e.g. by calling one

     * of the fillText Methods.

     *

     * @param font

     */

    public void setFont(String font) {

        graphicsEnvironmentImpl.setFont(font);

    }

    /**

     * sets the Style of the Stroke.

     *

     * @param style

     */

    public void setStrokeStyle(Style style) {

        Object nativeStrokeStyle = graphicsEnvironmentImpl.setStrokeStyle(style, style.getCached());

        style.cache(nativeStrokeStyle);

    }

    /**

     * Gets the current TextAlignment attribute

     *

     * @return TextAlignment with values of left, center, right, or justify.

     */

    public String getTextAlign() {

        return graphicsEnvironmentImpl.getTextAlign();

    }

    /**

     * Defines horizontal text alignment, relative to the text {@code x} origin.

     * <p>

     * Let horizontal bounds represent the logical width of a single line of

     * text. Where each line of text has a separate horizontal bounds.

     * <p>

     * Then TextAlignment is specified as:

     * <ul>

     * <li>left: the left edge of the horizontal bounds will be at {@code x}.

     * <li>center: the center, halfway between left and right edge, of the

     * horizontal bounds will be at {@code x}.

     * <li>right: the right edge of the horizontal bounds will be at {@code x}.

     * </ul>

     * <p>

     *

     * Note: Canvas does not support line wrapping, therefore the text alignment

     * Justify is identical to left aligned text.

     * <p>

     *

     * @param textAlign with values of left, center, right.

     */

    public void setTextAlign(String textAlign) {

        graphicsEnvironmentImpl.setTextAlign(textAlign);

    }

    /**

     * Gets the current Text Baseline attribute.

     *

     * @return baseline with values of top, center, baseline, or bottom

     */

    public String getTextBaseline() {

        return graphicsEnvironmentImpl.getTextBaseline();

    }

    /**

     * Sets the current Text Baseline attribute.

     *

     * @param baseline with values of top, center, baseline, or bottom

     */

    public void setTextBaseline(String textbaseline) {

        graphicsEnvironmentImpl.setTextBaseline(textbaseline);

    }

    /**

     * Renders the indicated String with current fill. default is black.

     *

     * @param text the text to stroke

     * @param x x coordinate of start position

     * @param y y coordinate of start position

     */

    public void fillText(String text, double x, double y) {

        graphicsEnvironmentImpl.fillText(text, x, y);

    }

    /**

     * Renders the indicated String with current fill. default is black.

     *

     * @param text the text to stroke

     * @param x x coordinate of start position

     * @param y y coordinate of start position

     * @param maxWidth maximum width of text

     */

    public void fillText(String text, double x, double y, double maxWidth) {

        graphicsEnvironmentImpl.fillText(text, x, y, maxWidth);

    }

    /**

     * Check the length of a text before writing it to the Canvas. Takes into

     * account the current Font.

     *

     * @param text the text to measure

     * @return the length in pixels

     */

    public Dimension measureText(String text) {

        return graphicsEnvironmentImpl.measureText(text);

    }

    /**

     * Renders the indicated String (with no fill)

     *

     * @param text the text to stroke

     * @param x x coordinate of start position

     * @param y y coordinate of start position

     */

    public void strokeText(String text, double x, double y) {

        graphicsEnvironmentImpl.strokeText(text, x, y);

    }

    /**

     * Renders the indicated String (with no fill)

     *

     * @param text the text to stroke

     * @param x x coordinate of start position

     * @param y y coordinate of start position

     * @param maxWidth maximum width of text

     */

    public void strokeText(String text, double x, double y, double maxWidth) {

        graphicsEnvironmentImpl.strokeText(text, x, y, maxWidth);

    }

//    public ImageData createPixelMap(double x, double y) {

//        return graphicsEnvironmentImpl.createPixelMap(x, y);

//    }

//

//    public ImageData createPixelMap(ImageData pixelMap) {

//        return graphicsEnvironmentImpl.createPixelMap(pixelMap);

//    }

//

//    public ImageData getSnapshot(double x, double y, double width, double height) {

//        return graphicsEnvironmentImpl.getPixelMap(x, y, width, height);

//    }

//

//    public void drawPixelMap(ImageData pixelMap, double x, double y) {

//        graphicsEnvironmentImpl.putPixelMap(pixelMap, x, y);

//    }

//

//    public void drawPixelMap(ImageData pixelMap, double x, double y, double dirtyx, double dirtyy, double dirtywidth, double dirtyheight) {

//        graphicsEnvironmentImpl.putPixelMap(pixelMap, x, y, dirtyx, dirtyy, dirtywidth, dirtyheight);

//    }

    /**

     * Sets the global alpha of the current state.

     *

     * @param alpha value in the range {@code 0.0-1.0}. The value is clamped if

     * it is out of range.

     */

    public void setGlobalAlpha(double alpha) {

        graphicsEnvironmentImpl.setGlobalAlpha(alpha);

    }

    /**

     * Gets the current global alpha.

     *

     * @return the current global alpha.

     */

    public double getGlobalAlpha() {

        return graphicsEnvironmentImpl.getGlobalAlpha();

    }

    /**

     * Sets the global blend mode.

     *

     * @param op the BlendMode that will be set.

     */

    public void setGlobalCompositeOperation(String operation) {

        graphicsEnvironmentImpl.setGlobalCompositeOperation(operation);

    }

    /**

     * Gets the global blend mode.

     *

     * @return the global BlendMode of the current state.

     */

    public String getGlobalCompositeOperation() {

        return graphicsEnvironmentImpl.getGlobalCompositeOperation();

    }

    /**

     * Create a LinearGradient to use in Canvas.

     *

     * @param x0 x coordinate of start point

     * @param y0 y coordinate of start point

     * @param x1 x coordinate of end point

     * @param y1 y coordinate of end point

     * @return the gradient

     */

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

        return new Style.LinearGradient(x0, y0, x1, y1);

    }

    /**

     * Create an Image Pattern from a source Image and a repeat style. Possible

     * Styles are repeat, repeat-x, repeat-y, or no-repeat. defaults to repeat

     *

     * @param image the Image

     * @param repeat the repeat style

     * @return the Pattern

     */

    public Pattern createPattern(Image image, String repeat) {

        return new Pattern(image, repeat);

    }

    /**

     * Create a 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

     * @return the Gradient

     */

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

        return new RadialGradient(x0, y0, r0, x1, y1, r1);

    }

    /**

     * Convert this String Representation of a Color to a Color Object.

     *

     * @param webColor

     * @return The Color represented by the input

     */

    public Color getWebColor(String webColor) {

        return new Style.Color(webColor);

    }

    /**

     * Get the height of this GraphicsContext (which should be the same as the

     * enclosing canvas height)

     *

     * @return the height of this GraphicsContext

     */

    public int getHeight() {

        return graphicsEnvironmentImpl.getHeight();

    }

    /**

     * Get the width of this GraphicsContext (which should be the same as the

     * enclosing canvas height)

     *

     * @return the width of this GraphicsContext

     */

    public int getWidth() {

        return graphicsEnvironmentImpl.getWidth();

    }

//    public void setHeight(int height) {

//        graphicsEnvironmentImpl.setHeight(height);

//    }

//

//    public void setWidth(int width) {

//        graphicsEnvironmentImpl.setWidth(width);

//    }

    /**

     * Fill a circle with a center position of centerX, centerY and the

     * specified radius.

     *

     * @param centerX

     * @param centerY

     * @param radius

     */

    public void fillCircle(float centerX, float centerY, float radius) {

        graphicsEnvironmentImpl.arc(centerX, centerY, radius, 0, Math.PI * 2, false);

    }

    /**

     * Fills a polygon with the given points using the currently set fill paint.

     *

     * @param x_coord array containing the x coordinates of the polygon's

     * points.

     * @param y_coord array containing the y coordinates of the polygon's

     * points.

     * @param vertexCount the number of points that make the polygon.

     */

    public void fillPolygon(double[] x_coord, double[] y_coord, int vertexCount) {

        if (vertexCount >= 1 && x_coord != null && x_coord.length >= vertexCount && y_coord != null && y_coord.length >= vertexCount) {

            graphicsEnvironmentImpl.beginPath();

        }

        graphicsEnvironmentImpl.moveTo(x_coord[0], y_coord[0]);

        for (int i = 1; i < vertexCount; i++) {

            graphicsEnvironmentImpl.lineTo(x_coord[i], y_coord[i]);

        }

        graphicsEnvironmentImpl.closePath();

        graphicsEnvironmentImpl.fill();

        graphicsEnvironmentImpl.stroke();

    }

}