/*
 * VsqNote.cs
 * Copyright (c) 2008-2009 kbinani
 *
 * This file is part of Boare.Lib.Vsq.
 *
 * Boare.Lib.Vsq is free software; you can redistribute it and/or
 * modify it under the terms of the BSD License.
 *
 * Boare.Lib.Vsq 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.
 */
using System;
using System.Collections.Generic;
using System.Text;

using bocoree;

namespace Boare.Lib.Vsq {

    using boolean = System.Boolean;

    /// <summary>
    /// 音階を表現するためのクラス
    /// </summary>
    [Serializable]
    public class VsqNote {
        /// <summary>
        /// このインスタンスが表す音階のノート値
        /// </summary>
        public int Value;
        private static readonly boolean[] _KEY_TYPE = new boolean[128] { 
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
            false,
            true,
            true,
            false,
            true,
        };

        /// <summary>
        /// 音階のノート値からのコンストラクタ。
        /// </summary>
        /// <param name="note">この音階を初期化するためのノート値</param>
        public VsqNote( int note ) {
            Value = note;
        }

        /// <summary>
        /// このインスタンスが表す音階が、ピアノの白鍵かどうかを返します
        /// </summary>
        public boolean isWhiteKey() {
            return isNoteWhiteKey( Value );
        }

        /// <summary>
        /// 指定した音階が、ピアノの白鍵かどうかを返します
        /// </summary>
        /// <param name="note"></param>
        /// <returns></returns>
        public static boolean isNoteWhiteKey( int note ) {
            if ( 0 <= note && note <= 127 ) {
                return _KEY_TYPE[note];
            } else {
                int odd = note % 12;
                switch ( odd ) {
                    case 1:
                    case 3:
                    case 6:
                    case 8:
                    case 10:
                        return false;
                    default:
                        return true;
                }
            }
        }

        public static String getNoteString( int note ) {
            int odd = note % 12;
            int order = (note - odd) / 12 - 2;
            switch ( odd ) {
                case 0:
                    return "C" + order;
                case 1:
                    return "C#" + order;
                case 2:
                    return "D" + order;
                case 3:
                    return "Eb" + order;
                case 4:
                    return "E" + order;
                case 5:
                    return "F" + order;
                case 6:
                    return "F#" + order;
                case 7:
                    return "G" + order;
                case 8:
                    return "G#" + order;
                case 9:
                    return "A" + order;
                case 10:
                    return "Bb" + order;
                case 11:
                    return "B" + order;
                default:
                    return "";
            }
        }

        override public String ToString() {
            return getNoteString( Value );
        }
    }

}