/*
 *				Tweetings - Twitter client for Android
 * 
 * Copyright (C) 2012-2013 RBD Solutions Limited <apps@tweetings.net>
 * Copyright (C) 2012 Mariotaku Lee <mariotaku.lee@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.dwdesign.tweetings.util;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;

import android.graphics.Bitmap;
import android.graphics.Color;

/**
 * 
 * @author mariotaku
 * 
 *         Get the main color from a {@link Bitmap}<br>
 * <br>
 * 
 *         <b>Important</b>: I recommand using this method in different thread.
 *         Or it will make your application laggy or unresponceable.
 */
public class ColorAnalyser {

	/**
	 * 
	 * Get the main color from a {@link Bitmap}.<br>
	 * 
	 * @param bitmap The {@link Bitmap} to analyse
	 * @return The rgb {@link Color} in integer (no alpha)
	 */
	public static int analyse(final Bitmap bitmap) {

		return analyse(bitmap, 18, 28);
	}

	/**
	 * 
	 * Get the main color from a {@link Bitmap}.<br>
	 * 
	 * @param bitmap The {@link Bitmap} to analyse
	 * @param width The desired width of scaled bitmap
	 * @param height The desired height of scaled bitmap
	 * @return The rgb {@link Color} in integer (no alpha)
	 */
	public static int analyse(final Bitmap bitmap, final int width, final int height) {
		return analyse(bitmap, width, height, Color.WHITE);
	}

	/**
	 * 
	 * Get the main color from a {@link Bitmap}.<br>
	 * 
	 * @param bitmap The {@link Bitmap} to analyse
	 * @param width The desired width of scaled bitmap
	 * @param height The desired height of scaled bitmap
	 * @param def The default color returned, if bitmap is null
	 * @return The rgb {@link Color} in integer (no alpha)
	 */
	public static int analyse(final Bitmap bitmap, final int width, final int height, final int def) {

		if (bitmap == null) return def;

		int color = 0;

		final HashMap<Float, Integer> colorsMap = new HashMap<Float, Integer>();
		final ArrayList<Float> colorsScore = new ArrayList<Float>();

		final Bitmap resized = Bitmap.createScaledBitmap(bitmap, width, height, false);

		final int resized_height = resized.getHeight(), resized_width = resized.getWidth();

		for (int y = 0; y < resized_height; y++) {
			for (int x = 0; x < resized_width; x++) {
				final int temp_color = resized.getPixel(x, y);
				color = Color.argb(0xFF, Color.red(temp_color), Color.green(temp_color), Color.blue(temp_color));
				final float[] hsv = new float[3];
				Color.colorToHSV(color, hsv);

				final float score = (hsv[1] * hsv[1] + 0.001f) * (hsv[2] * hsv[2]);

				colorsMap.put(score, color);
				colorsScore.add(score);
			}
		}

		Collections.sort(colorsScore);
		bitmap.recycle();
		resized.recycle();
		return colorsMap.get(colorsScore.get(colorsScore.size() - 1));

	}
}