/*
 * Copyright 2016 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.oscim.android.canvas;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Picture;
import android.graphics.RectF;

import com.caverock.androidsvg.SVG;

import org.oscim.backend.CanvasAdapter;

import java.io.IOException;
import java.io.InputStream;

public class AndroidSvgBitmap extends AndroidBitmap {
    /**
     * Default size is 20x20px (400px) at baseline mdpi (160dpi).
     */
    public static float DEFAULT_SIZE = 400f;

    public static android.graphics.Bitmap getResourceBitmap(InputStream inputStream, float scaleFactor, float defaultSize, int width, int height, int percent) throws IOException {
        try {
            SVG svg = SVG.getFromInputStream(inputStream);
            Picture picture = svg.renderToPicture();

            double scale = scaleFactor / Math.sqrt((picture.getHeight() * picture.getWidth()) / defaultSize);

            float bitmapWidth = (float) (picture.getWidth() * scale);
            float bitmapHeight = (float) (picture.getHeight() * scale);

            float aspectRatio = (1f * picture.getWidth()) / picture.getHeight();

            if (width != 0 && height != 0) {
                // both width and height set, override any other setting
                bitmapWidth = width;
                bitmapHeight = height;
            } else if (width == 0 && height != 0) {
                // only width set, calculate from aspect ratio
                bitmapWidth = height * aspectRatio;
                bitmapHeight = height;
            } else if (width != 0 && height == 0) {
                // only height set, calculate from aspect ratio
                bitmapHeight = width / aspectRatio;
                bitmapWidth = width;
            }

            if (percent != 100) {
                bitmapWidth *= percent / 100f;
                bitmapHeight *= percent / 100f;
            }

            android.graphics.Bitmap bitmap = android.graphics.Bitmap.createBitmap((int) Math.ceil(bitmapWidth),
                    (int) Math.ceil(bitmapHeight), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(bitmap);
            canvas.drawPicture(picture, new RectF(0, 0, bitmapWidth, bitmapHeight));

            return bitmap;
        } catch (Exception e) {
            throw new IOException(e);
        }
    }

    private static android.graphics.Bitmap getResourceBitmapImpl(InputStream inputStream) throws IOException {
        synchronized (SVG.getVersion()) {
            return getResourceBitmap(inputStream, CanvasAdapter.dpi / 160, DEFAULT_SIZE, 0, 0, 100);
        }
    }

    public AndroidSvgBitmap(InputStream inputStream) throws IOException {
        super(getResourceBitmapImpl(inputStream));
    }
}