package de.danoeh.antennapod.util;

import de.danoeh.antennapod.AppConfig;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;

public class BitmapDecoder {
	private static final String TAG = "BitmapDecoder";

	private static int calculateSampleSize(int preferredLength, int length) {
		int sampleSize = 1;
		if (length > preferredLength) {
			sampleSize = Math.round(((float) length / (float) preferredLength));
		}
		return sampleSize;
	}

	public static Bitmap decodeBitmap(int preferredLength, String fileUrl) {
		BitmapFactory.Options options = new BitmapFactory.Options();
		options.inJustDecodeBounds = true;
		BitmapFactory.decodeFile(fileUrl, options);
		int srcWidth = options.outWidth;
		int srcHeight = options.outHeight;
		int length = Math.max(srcWidth, srcHeight);
		int sampleSize = calculateSampleSize(preferredLength, length);
		if (AppConfig.DEBUG)
			Log.d(TAG, "Using samplesize " + sampleSize);
		options.inJustDecodeBounds = false;
		options.inSampleSize = sampleSize;
		options.inPreferredConfig = Bitmap.Config.ARGB_8888;

		Bitmap decodedBitmap = BitmapFactory.decodeFile(fileUrl, options);
		if (decodedBitmap == null) {
			Log.i(TAG,
					"Bitmap could not be decoded in custom sample size. Trying default sample size (path was "
							+ fileUrl + ")");
			decodedBitmap = BitmapFactory.decodeFile(fileUrl);
		}
		return decodedBitmap;
	}
}