using System;
using System.Collections.Generic;
using System.Linq;
using BurnOutSharp.Matching;

namespace BurnOutSharp.ProtectionType
{
    public class DVDCops : IContentCheck
    {
        /// <summary>
        /// Set of all ContentMatchSets for this protection
        /// </summary>
        private static readonly List<ContentMatchSet> contentMatchers = new List<ContentMatchSet>
        {
            // DVD-Cops,  ver. 
            new ContentMatchSet(new byte?[]
            {
                0x44, 0x56, 0x44, 0x2D, 0x43, 0x6F, 0x70, 0x73,
                0x2C, 0x20, 0x20, 0x76, 0x65, 0x72, 0x2E, 0x20
            }, GetVersion, "DVD-Cops"),
        };

        /// <inheritdoc/>
        public string CheckContents(string file, byte[] fileContent, bool includePosition = false)
        {
            return MatchUtil.GetFirstMatch(file, fileContent, contentMatchers, includePosition);
        }

        public static string GetVersion(string file, byte[] fileContent, List<int> positions)
        {
            char[] version = new ArraySegment<byte>(fileContent, positions[0] + 15, 4).Select(b => (char)b).ToArray();
            if (version[0] == 0x00)
                return string.Empty;

            return new string(version);
        }
    }
}