// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : PrintHex.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Helpers.
//
// --[ Description ] ----------------------------------------------------------
//
//     Prints a byte array as hexadecimal.
//
// --[ License ] --------------------------------------------------------------
//
//     This library is free software; you can redistribute it and/or modify
//     it under the terms of the GNU Lesser General Public License as
//     published by the Free Software Foundation; either version 2.1 of the
//     License, or (at your option) any later version.
//
//     This library 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
//     Lesser General Public License for more details.
//
//     You should have received a copy of the GNU Lesser General Public
//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2020 Natalia Portillo
// ****************************************************************************/

using System.Text;
using Aaru.Console;

namespace Aaru
{
    public static class PrintHex
    {
        /// <summary>Prints a byte array as hexadecimal values to the console</summary>
        /// <param name="array">Array</param>
        /// <param name="width">Width of line</param>
        public static void PrintHexArray(byte[] array, int width = 16) =>
            AaruConsole.WriteLine(ByteArrayToHexArrayString(array, width));

        /// <summary>Prints a byte array as hexadecimal values to a string</summary>
        /// <param name="array">Array</param>
        /// <param name="width">Width of line</param>
        /// <param name="color">Use ANSI escape colors for sections</param>
        /// <returns>String containing hexadecimal values</returns>
        public static string ByteArrayToHexArrayString(byte[] array, int width = 16, bool color = false)
        {
            if(array is null)
                return null;

            // TODO: Color list
            // TODO: Allow to change width
            string str          = "Offset";
            int    rows         = array.Length / 16;
            int    last         = array.Length % 16;
            int    offsetLength = $"{array.Length:X}".Length;
            var    sb           = new StringBuilder();

            if(last > 0)
                rows++;

            if(last == 0)
                last = 16;

            if(offsetLength < str.Length)
                offsetLength = str.Length;

            while(str.Length < offsetLength)
                str += ' ';

            if(color)
                sb.Append("\u001b[36m");

            sb.Append(str);
            sb.Append("  ");

            for(int i = 0; i < 16; i++)
            {
                sb.AppendFormat(" {0:X2}", i);
            }

            if(color)
                sb.Append("\u001b[0m");

            sb.AppendLine();

            int b = 0;

            string format = $"{{0:X{offsetLength}}}";

            for(int i = 0; i < rows; i++)
            {
                if(color)
                    sb.Append("\u001b[36m");

                sb.AppendFormat(format, b);

                if(color)
                    sb.Append("\u001b[0m");

                sb.Append("  ");
                int lastBytes  = i == rows - 1 ? last : 16;
                int lastSpaces = 16 - lastBytes;

                for(int j = 0; j < lastBytes; j++)
                {
                    sb.AppendFormat(" {0:X2}", array[b]);
                    b++;
                }

                for(int j = 0; j < lastSpaces; j++)
                    sb.Append("   ");

                b -= lastBytes;
                sb.Append("   ");

                for(int j = 0; j < lastBytes; j++)
                {
                    int v = array[b];
                    sb.Append((v > 31 && v < 127) || v > 159 ? (char)v : '.');
                    b++;
                }

                sb.AppendLine();
            }

            return sb.ToString();
        }
    }
}