using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using BurnOutSharp.ExecutableType.Microsoft;
using BurnOutSharp.Matching;
using BurnOutSharp.Tools;

namespace BurnOutSharp.ProtectionType
{
    public class GFWL : IContentCheck, IPathCheck
    {
        /// <inheritdoc/>
        public string CheckContents(string file, byte[] fileContent, bool includeDebug, PortableExecutable pex, NewExecutable nex)
        {
            // Get the sections from the executable, if possible
            var sections = pex?.SectionTable;
            if (sections == null)
                return null;

            string name = Utilities.GetFileDescription(pex);
            if (!string.IsNullOrWhiteSpace(name) && name.StartsWith("Games for Windows - LIVE Zero Day Piracy Protection", StringComparison.OrdinalIgnoreCase))
                return $"Games for Windows LIVE - Zero Day Piracy Protection Module {Utilities.GetFileVersion(pex)}";
            else if (!string.IsNullOrWhiteSpace(name) && name.StartsWith("Games for Windows", StringComparison.OrdinalIgnoreCase))
                return $"Games for Windows LIVE {Utilities.GetFileVersion(pex)}";

            // Get the .rdata section, if it exists
            var rdataSection = sections.FirstOrDefault(s => Encoding.ASCII.GetString(s.Name).StartsWith(".rdata"));
            if (rdataSection != null)
            {
                int sectionAddr = (int)rdataSection.PointerToRawData;
                int sectionEnd = sectionAddr + (int)rdataSection.VirtualSize;
                var matchers = new List<ContentMatchSet>
                {
                    // xlive.dll
                    new ContentMatchSet(
                        new ContentMatch(new byte?[] { 0x78, 0x6C, 0x69, 0x76, 0x65, 0x2E, 0x64, 0x6C, 0x6C }, start: sectionAddr, end: sectionEnd),
                    "Games for Windows LIVE"),
                };

                string match = MatchUtil.GetFirstMatch(file, fileContent, matchers, includeDebug);
                if (!string.IsNullOrWhiteSpace(match))
                    return match;
            }

            return null;
        }

        /// <inheritdoc/>
        public ConcurrentQueue<string> CheckDirectoryPath(string path, IEnumerable<string> files)
        {
            var matchers = new List<PathMatchSet>
            {
                // Might be specifically GFWL/Gfwlivesetup.exe
                new PathMatchSet(new PathMatch("Gfwlivesetup.exe", useEndsWith: true), "Games for Windows LIVE"),
                new PathMatchSet(new PathMatch("xliveinstall.dll", useEndsWith: true), "Games for Windows LIVE"),
                new PathMatchSet(new PathMatch("XLiveRedist.msi", useEndsWith: true), "Games for Windows LIVE"),
            };

            return MatchUtil.GetAllMatches(files, matchers, any: true);
        }

        /// <inheritdoc/>
        public string CheckFilePath(string path)
        {
            var matchers = new List<PathMatchSet>
            {
                // Might be specifically GFWL/Gfwlivesetup.exe
                new PathMatchSet(new PathMatch("Gfwlivesetup.exe", useEndsWith: true), "Games for Windows LIVE"),
                new PathMatchSet(new PathMatch("xliveinstall.dll", useEndsWith: true), "Games for Windows LIVE"),
                new PathMatchSet(new PathMatch("XLiveRedist.msi", useEndsWith: true), "Games for Windows LIVE"),
            };

            return MatchUtil.GetFirstMatch(path, matchers, any: true);
        }
    }
}