/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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.apache.poi.ss.usermodel;

/**
 * A deprecated indexing scheme for colours that is still required for some records, and for backwards
 *  compatibility with OLE2 formats.
 *
 * <p>
 * Each element corresponds to a color index (zero-based). When using the default indexed color palette,
 * the values are not written out, but instead are implied. When the color palette has been modified from default,
 * then the entire color palette is used.
 * </p>
 *
 * @author Yegor Kozlov
 */
public enum IndexedColors {

    // 0-7?
    BLACK(8),
    WHITE(9),
    RED(10),
    BRIGHT_GREEN(11),
    BLUE(12),
    YELLOW(13),
    PINK(14),
    TURQUOISE(15),
    DARK_RED(16),
    GREEN(17),
    DARK_BLUE(18),
    DARK_YELLOW(19),
    VIOLET(20),
    TEAL(21),
    GREY_25_PERCENT(22),
    GREY_50_PERCENT(23),
    CORNFLOWER_BLUE(24),
    MAROON(25),
    LEMON_CHIFFON(26),
    // 27?
    ORCHID(28),
    CORAL(29),
    ROYAL_BLUE(30),
    LIGHT_CORNFLOWER_BLUE(31),
    SKY_BLUE(40),
    LIGHT_TURQUOISE(41),
    LIGHT_GREEN(42),
    LIGHT_YELLOW(43),
    PALE_BLUE(44),
    ROSE(45),
    LAVENDER(46),
    TAN(47),
    LIGHT_BLUE(48),
    AQUA(49),
    LIME(50),
    GOLD(51),
    LIGHT_ORANGE(52),
    ORANGE(53),
    BLUE_GREY(54),
    GREY_40_PERCENT(55),
    DARK_TEAL(56),
    SEA_GREEN(57),
    DARK_GREEN(58),
    OLIVE_GREEN(59),
    BROWN(60),
    PLUM(61),
    INDIGO(62),
    GREY_80_PERCENT(63),
    AUTOMATIC(64);

    private final static IndexedColors[] _values = new IndexedColors[65];
    static {
        for (IndexedColors color : values()) {
            _values[color.index] = color;
        }
    }
    
    public final short index;

    IndexedColors(int idx){
        index = (short)idx;
    }

    /**
     * Returns index of this color
     *
     * @return index of this color
     */
    public short getIndex(){
        return index;
    }
    
    /**
     * 
     *
     * @param index the index of the color
     * @return the corresponding IndexedColors enum
     * @throws IllegalArgumentException if index is not a valid IndexedColors
     * @since 3.15-beta2
     */
    public static IndexedColors fromInt(int index) {
        if (index < 0 || index >= _values.length) {
            throw new IllegalArgumentException("Illegal IndexedColor index: " + index);
        }
        IndexedColors color = _values[index];
        if (color == null) {
            throw new IllegalArgumentException("Illegal IndexedColor index: " + index);
        }
        return color;
    }
}