import java.lang.ref.WeakReference;
import java.util.InputMismatchException;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.View;


/**
 * A drawable that draws the target view as blurred using fast blur
 * <p/>
 * <p/>
 * TODO:we might use setBounds() to draw only part a of the target view
 * <p/>
 * Created by 10uR on 24.5.2014.
 */
public class BlurDrawable extends Drawable {

    private WeakReference<View> targetRef;
    private Bitmap              blurred;
    private Paint               paint;
    private int                 radius;


    public BlurDrawable(View target) {
        this(target, 10);
    }


    public BlurDrawable(View target, int radius) {
        this.targetRef = new WeakReference<View>(target);
        setRadius(radius);
        target.setDrawingCacheEnabled(true);
        target.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_AUTO);
        paint = new Paint();
        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
    }


    @Override
    public void draw(Canvas canvas) {
        if (blurred == null) {
            View target = targetRef.get();
            if (target != null) {
                Bitmap bitmap = target.getDrawingCache(true);
                if (bitmap == null)
                    return;
                blurred = fastBlur(bitmap, radius);
            }
        }
        if (blurred != null && !blurred.isRecycled())
            canvas.drawBitmap(blurred, 0, 0, paint);
    }


    /**
     * Set the bluring radius that will be applied to target view's bitmap
     *
     * @param radius should be 0-100
     */
    public void setRadius(int radius) {
        if (radius < 0 || radius > 100)
            throw new InputMismatchException("Radius must be 0 <= radius <= 100 !");
        this.radius = radius;
        if (blurred != null) {
            blurred.recycle();
            blurred = null;
        }
        invalidateSelf();
    }


    public int getRadius() {
        return radius;
    }


    @Override
    public void setAlpha(int alpha) {}


    @Override
    public void setColorFilter(ColorFilter cf) {

    }


    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }


    /**
     * from http://stackoverflow.com/a/10028267/3133545
     * <p/>
     * <p/>
     * <p/>
     * Stack Blur v1.0 from http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
     * <p/>
     * Java Author: Mario Klingemann <mario at quasimondo.com> http://incubator.quasimondo.com created Feburary 29, 2004 Android port : Yahel Bouaziz <yahel at
     * kayenko.com> http://www.kayenko.com ported april 5th, 2012
     * <p/>
     * This is a compromise between Gaussian Blur and Box blur It creates much better looking blurs than Box Blur, but is 7x faster than my Gaussian Blur
     * implementation.
     * <p/>
     * I called it Stack Blur because this describes best how this filter works internally: it creates a kind of moving stack of colors whilst scanning through
     * the image. Thereby it just has to add one new block of color to the right side of the stack and remove the leftmost color. The remaining colors on the
     * topmost layer of the stack are either added on or reduced by one, depending on if they are on the right or on the left side of the stack.
     * <p/>
     * If you are using this algorithm in your code please add the following line:
     * <p/>
     * Stack Blur Algorithm by Mario Klingemann <mario@quasimondo.com>
     */
    private static Bitmap fastBlur(Bitmap sentBitmap, int radius) {

        Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);

        if (radius < 1) {
            return (null);
        }

        int w = bitmap.getWidth();
        int h = bitmap.getHeight();

        int[] pix = new int[w * h];
        Log.e("pix", w + " " + h + " " + pix.length);
        bitmap.getPixels(pix, 0, w, 0, 0, w, h);

        int wm = w - 1;
        int hm = h - 1;
        int wh = w * h;
        int div = radius + radius + 1;

        int r[] = new int[wh];
        int g[] = new int[wh];
        int b[] = new int[wh];
        int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
        int vmin[] = new int[Math.max(w, h)];

        int divsum = (div + 1) >> 1;
        divsum *= divsum;
        int dv[] = new int[256 * divsum];
        for (i = 0; i < 256 * divsum; i++) {
            dv[i] = (i / divsum);
        }

        yw = yi = 0;

        int[][] stack = new int[div][3];
        int stackpointer;
        int stackstart;
        int[] sir;
        int rbs;
        int r1 = radius + 1;
        int routsum, goutsum, boutsum;
        int rinsum, ginsum, binsum;

        for (y = 0; y < h; y++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            for (i = -radius; i <= radius; i++) {
                p = pix[yi + Math.min(wm, Math.max(i, 0))];
                sir = stack[i + radius];
                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);
                rbs = r1 - Math.abs(i);
                rsum += sir[0] * rbs;
                gsum += sir[1] * rbs;
                bsum += sir[2] * rbs;
                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                } else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }
            }
            stackpointer = radius;

            for (x = 0; x < w; x++) {

                r[yi] = dv[rsum];
                g[yi] = dv[gsum];
                b[yi] = dv[bsum];

                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;

                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];

                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];

                if (y == 0) {
                    vmin[x] = Math.min(x + radius + 1, wm);
                }
                p = pix[yw + vmin[x]];

                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);

                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];

                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;

                stackpointer = (stackpointer + 1) % div;
                sir = stack[(stackpointer) % div];

                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];

                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];

                yi++;
            }
            yw += w;
        }
        for (x = 0; x < w; x++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            yp = -radius * w;
            for (i = -radius; i <= radius; i++) {
                yi = Math.max(0, yp) + x;

                sir = stack[i + radius];

                sir[0] = r[yi];
                sir[1] = g[yi];
                sir[2] = b[yi];

                rbs = r1 - Math.abs(i);

                rsum += r[yi] * rbs;
                gsum += g[yi] * rbs;
                bsum += b[yi] * rbs;

                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                } else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }

                if (i < hm) {
                    yp += w;
                }
            }
            yi = x;
            stackpointer = radius;
            for (y = 0; y < h; y++) {
                // Preserve alpha channel: ( 0xff000000 & pix[yi] )
                pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16) | (dv[gsum] << 8) | dv[bsum];

                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;

                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];

                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];

                if (x == 0) {
                    vmin[y] = Math.min(y + r1, hm) * w;
                }
                p = x + vmin[y];

                sir[0] = r[p];
                sir[1] = g[p];
                sir[2] = b[p];

                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];

                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;

                stackpointer = (stackpointer + 1) % div;
                sir = stack[stackpointer];

                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];

                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];

                yi += w;
            }
        }

        bitmap.setPixels(pix, 0, w, 0, 0, w, h);

        return (bitmap);
    }

}

mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                R.drawable.menu, R.string.drawer_open, R.string.drawer_close) {

            /* Called when drawer is closed */
            public void onDrawerClosed(View view) {

            }


            /* Called when a drawer is opened */
            public void onDrawerOpened(View drawerView) {
                View view = findViewById(android.R.id.content);
                BlurDrawable blurDrawable = new BlurDrawable(view, 40);
                drawerView.setBackgroundDrawable(blurDrawable);
            }
        };