/*
 * Copyright 2010, 2011, 2012, 2013 mapsforge.org
 * Copyright 2014 Ludwig M Brinckmann
 * Copyright 2015-2017 devemux86
 *
 * This program is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.mapsforge.map.android.graphics;

import android.annotation.TargetApi;
import android.graphics.BitmapShader;
import android.graphics.DashPathEffect;
import android.graphics.Matrix;
import android.graphics.PathEffect;
import android.graphics.Rect;
import android.graphics.Shader;
import android.graphics.Shader.TileMode;
import android.graphics.Typeface;
import android.os.Build;

import org.mapsforge.core.graphics.Align;
import org.mapsforge.core.graphics.Cap;
import org.mapsforge.core.graphics.Color;
import org.mapsforge.core.graphics.FontFamily;
import org.mapsforge.core.graphics.FontStyle;
import org.mapsforge.core.graphics.Join;
import org.mapsforge.core.graphics.Paint;
import org.mapsforge.core.graphics.Style;
import org.mapsforge.core.model.Point;

class AndroidPaint implements Paint {
    private static android.graphics.Paint.Align getAndroidAlign(Align align) {
        switch (align) {
            case CENTER:
                return android.graphics.Paint.Align.CENTER;
            case LEFT:
                return android.graphics.Paint.Align.LEFT;
            case RIGHT:
                return android.graphics.Paint.Align.RIGHT;
        }

        throw new IllegalArgumentException("unknown align: " + align);
    }

    private static android.graphics.Paint.Cap getAndroidCap(Cap cap) {
        switch (cap) {
            case BUTT:
                return android.graphics.Paint.Cap.BUTT;
            case ROUND:
                return android.graphics.Paint.Cap.ROUND;
            case SQUARE:
                return android.graphics.Paint.Cap.SQUARE;
        }

        throw new IllegalArgumentException("unknown cap: " + cap);
    }

    private static android.graphics.Paint.Join getAndroidJoin(Join join) {
        switch (join) {
            case BEVEL:
                return android.graphics.Paint.Join.BEVEL;
            case ROUND:
                return android.graphics.Paint.Join.ROUND;
            case MITER:
                return android.graphics.Paint.Join.MITER;
        }

        throw new IllegalArgumentException("unknown join: " + join);
    }

    private static android.graphics.Paint.Style getAndroidStyle(Style style) {
        switch (style) {
            case FILL:
                return android.graphics.Paint.Style.FILL;
            case STROKE:
                return android.graphics.Paint.Style.STROKE;
        }

        throw new IllegalArgumentException("unknown style: " + style);
    }

    private static int getFontStyle(FontStyle fontStyle) {
        switch (fontStyle) {
            case BOLD:
                return Typeface.BOLD;
            case BOLD_ITALIC:
                return Typeface.BOLD_ITALIC;
            case ITALIC:
                return Typeface.ITALIC;
            case NORMAL:
                return Typeface.NORMAL;
        }

        throw new IllegalArgumentException("unknown font style: " + fontStyle);
    }

    private static Typeface getTypeface(org.mapsforge.core.graphics.FontFamily fontFamily) {
        switch (fontFamily) {
            case DEFAULT:
                return Typeface.DEFAULT;
            case MONOSPACE:
                return Typeface.MONOSPACE;
            case SANS_SERIF:
                return Typeface.SANS_SERIF;
            case SERIF:
                return Typeface.SERIF;
        }

        throw new IllegalArgumentException("unknown font family: " + fontFamily);
    }

    final android.graphics.Paint paint;

    // needed to record size of bitmap shader to compute the shift
    private int shaderWidth;
    private int shaderHeight;

    // Avoid creating unnecessary objects
    private final Rect rect = new Rect();

    AndroidPaint() {
        paint = new android.graphics.Paint();
        this.paint.setAntiAlias(true);
        this.paint.setStrokeCap(getAndroidCap(Cap.ROUND));
        this.paint.setStrokeJoin(android.graphics.Paint.Join.ROUND);
        this.paint.setStyle(getAndroidStyle(Style.FILL));
    }

    AndroidPaint(Paint paint) {
        this.paint = new android.graphics.Paint(((AndroidPaint) paint).paint);
    }

    @Override
    public int getColor() {
        return this.paint.getColor();
    }

    @Override
    public float getStrokeWidth() {
        return paint.getStrokeWidth();
    }

    @Override
    public int getTextHeight(String text) {
        this.paint.getTextBounds(text, 0, text.length(), rect);
        return rect.height();
    }

    @Override
    public int getTextWidth(String text) {
        return (int) this.paint.measureText(text);
    }

    @Override
    public boolean isTransparent() {
        return this.paint.getShader() == null && this.paint.getAlpha() == 0;
    }

    @SuppressWarnings("unused")
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @Override
    public void setBitmapShader(org.mapsforge.core.graphics.Bitmap bitmap) {
        if (bitmap == null) {
            return;
        }
        android.graphics.Bitmap androidBitmap = AndroidGraphicFactory.getBitmap(bitmap);
        if (androidBitmap == null) {
            return;
        }

        this.shaderWidth = bitmap.getWidth();
        this.shaderHeight = bitmap.getHeight();
        if (!AndroidGraphicFactory.KEEP_RESOURCE_BITMAPS && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            // there is an problem when bitmaps are recycled too early on honeycomb and up,
            // where shaders are corrupted. This problem does of course not arise if
            // the bitmaps are cached for future use.
            // incrementing the refcount stops the recycling, but leaks the bitmap.
            bitmap.incrementRefCount();
        }
        this.paint.setColor(AndroidGraphicFactory.getColor(Color.WHITE));
        this.paint.setShader(new BitmapShader(androidBitmap, TileMode.REPEAT, TileMode.REPEAT));

    }

    /**
     * Shifts the bitmap pattern so that it will always start at a multiple of
     * itself for any tile the pattern is used. This ensures that regardless of
     * size of the pattern it tiles correctly.
     *
     * @param origin the reference point
     */
    @Override
    public void setBitmapShaderShift(Point origin) {
        Shader shader = this.paint.getShader();
        if (shader != null) {
            int relativeDx = ((int) -origin.x) % this.shaderWidth;
            int relativeDy = ((int) -origin.y) % this.shaderHeight;

            Matrix localMatrix = new Matrix();
            localMatrix.setTranslate(relativeDx, relativeDy);
            shader.setLocalMatrix(localMatrix);
        }
    }

    @Override
    public void setColor(Color color) {
        this.paint.setColor(AndroidGraphicFactory.getColor(color));
    }

    @Override
    public void setColor(int color) {
        this.paint.setColor(color);
    }

    @Override
    public void setDashPathEffect(float[] strokeDasharray) {
        PathEffect pathEffect = new DashPathEffect(strokeDasharray, 0);
        this.paint.setPathEffect(pathEffect);
    }

    @Override
    public void setStrokeCap(Cap cap) {
        this.paint.setStrokeCap(getAndroidCap(cap));
    }

    @Override
    public void setStrokeJoin(org.mapsforge.core.graphics.Join join) {
        this.paint.setStrokeJoin(getAndroidJoin(join));
    }

    @Override
    public void setStrokeWidth(float strokeWidth) {
        this.paint.setStrokeWidth(strokeWidth);
    }

    @Override
    public void setStyle(Style style) {
        this.paint.setStyle(getAndroidStyle(style));
    }

    @Override
    public void setTextAlign(Align align) {
        this.paint.setTextAlign(getAndroidAlign(align));
    }

    @Override
    public void setTextSize(float textSize) {
        this.paint.setTextSize(textSize);
    }

    @Override
    public void setTypeface(FontFamily fontFamily, FontStyle fontStyle) {
        this.paint.setTypeface(Typeface.create(getTypeface(fontFamily), getFontStyle(fontStyle)));
    }
}
