/* Copyright (C) 2014 by John Cronin
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:

 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/* The palette contains a mapping from location in the trie to ascii characters and back */

using System;
using System.Collections.Generic;
using System.Text;

namespace tytrie
{
    class Palette
    {
        static char[] DEFAULT_PALETTE = new char[] { '\0', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
            '#', '_', '/', '<', '>', '.' };

        char[] pal;
        Dictionary<char, int> reverse;

        public Palette(char[] palette) { pal = palette; PopulateReverse(); }
        public Palette() { pal = DEFAULT_PALETTE; PopulateReverse(); }

        void PopulateReverse()
        {
            reverse = new Dictionary<char, int>();
            int i = 0;
            foreach (char c in pal)
                reverse[c] = i++;
        }

        public char GetChar(int idx) { return pal[idx]; }
        public int GetIdx(char c) { return reverse[c]; }
        public int Size { get { return pal.Length; } }
    }
}
