package org.activityinfo.server.report.generator.map;

/*
 * #%L
 * ActivityInfo Server
 * %%
 * Copyright (C) 2009 - 2013 UNICEF
 * %%
 * 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/gpl-3.0.html>.
 * #L%
 */

import java.io.Serializable;

public class RgbColor implements Serializable {

    private int red, green, blue;

    private RgbColor() {

    }

    public RgbColor(int red, int green, int blue) {
        this.red = red;
        this.green = green;
        this.blue = blue;
    }

    public RgbColor(String hexString) {
        if (hexString.startsWith("#")) {
            hexString = hexString.substring(1);
        }
        this.red = Integer.parseInt(hexString.substring(0, 2), 16);
        this.green = Integer.parseInt(hexString.substring(2, 4), 16);
        this.blue = Integer.parseInt(hexString.substring(4, 6), 16);
    }

    public int getRed() {
        return red;
    }

    public int getGreen() {
        return green;
    }

    public int getBlue() {
        return blue;
    }

    public static RgbColor interpolate(RgbColor from, RgbColor to, double p) {
        return new RgbColor(interpolate(from.red, to.red, p),
                interpolate(from.green, to.green, p),
                interpolate(from.blue, to.blue, p));
    }

    private static int interpolate(int from, int to, double p) {
        return (int) (from + ((to - from) * p));
    }

    public String toHexString() {
        return toHexByte(red) + toHexByte(green) + toHexByte(blue);
    }

    private String toHexByte(int component) {
        if (component < 16) {
            return '0' + Integer.toString(component, 16);
        } else {
            return Integer.toString(component, 16);
        }
    }
}