/*******************************************************************************
 * Copyright 2011-2013 Sergey Tarasevich
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package org.getlantern.firetweet.util.imageloader;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.drawable.Drawable;

import com.nostra13.universalimageloader.core.assist.LoadedFrom;
import com.nostra13.universalimageloader.core.display.BitmapDisplayer;
import com.nostra13.universalimageloader.core.imageaware.ImageAware;
import com.nostra13.universalimageloader.core.imageaware.ImageViewAware;

/**
 * Can display bitmap with rounded corners. This implementation works only with ImageViews wrapped
 * in ImageViewAware.
 * <br />
 * This implementation is inspired by
 * <a href="http://www.curious-creature.org/2012/12/11/android-recipe-1-image-with-rounded-corners/">
 * Romain Guy's article</a>. It rounds images using custom drawable drawing. Original bitmap isn't changed.
 * <br />
 * <br />
 * If this implementation doesn't meet your needs then consider
 * <a href="https://github.com/vinc3m1/RoundedImageView">RoundedImageView</a> or
 * <a href="https://github.com/Pkmmte/CircularImageView">CircularImageView</a> projects for usage.
 *
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @since 1.5.6
 */
public class OvalBitmapDisplayer implements BitmapDisplayer {

    protected final int margin;

    public OvalBitmapDisplayer() {
        this(0);
    }

    public OvalBitmapDisplayer(int marginPixels) {
        this.margin = marginPixels;
    }

    @Override
    public void display(Bitmap bitmap, ImageAware imageAware, LoadedFrom loadedFrom) {
        if (!(imageAware instanceof ImageViewAware)) {
            throw new IllegalArgumentException("ImageAware should wrap ImageView. ImageViewAware is expected.");
        }

        imageAware.setImageDrawable(new OvalDrawable(bitmap, margin));
    }

    public static class OvalDrawable extends Drawable {

        protected final int margin;

        protected final RectF mRect = new RectF(),
                mBitmapRect;
        protected final BitmapShader bitmapShader;
        protected final Paint paint;

        public OvalDrawable(Bitmap bitmap, int margin) {
            this.margin = margin;

            bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
            mBitmapRect = new RectF(margin, margin, bitmap.getWidth() - margin, bitmap.getHeight() - margin);

            paint = new Paint();
            paint.setAntiAlias(true);
            paint.setShader(bitmapShader);
        }

        @Override
        protected void onBoundsChange(Rect bounds) {
            super.onBoundsChange(bounds);
            mRect.set(margin, margin, bounds.width() - margin, bounds.height() - margin);

            // Resize the original bitmap to fit the new bound
            Matrix shaderMatrix = new Matrix();
            shaderMatrix.setRectToRect(mBitmapRect, mRect, Matrix.ScaleToFit.FILL);
            bitmapShader.setLocalMatrix(shaderMatrix);

        }

        @Override
        public void draw(Canvas canvas) {
            canvas.drawOval(mRect, paint);
        }

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

        @Override
        public void setAlpha(int alpha) {
            paint.setAlpha(alpha);
        }

        @Override
        public void setColorFilter(ColorFilter cf) {
            paint.setColorFilter(cf);
        }
    }
}