using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace BurnOutSharp.ProtectionType
{
    public class CactusDataShield
    {
        public static string CheckContents(byte[] fileContent, bool includePosition = false)
        {
            // DATA.CDS
            byte[] check = new byte[] { 0x44, 0x41, 0x54, 0x41, 0x2E, 0x43, 0x44, 0x53 };
            if (fileContent.Contains(check, out int position))
                return "Cactus Data Shield 200" + (includePosition ? $" (Index {position})" : string.Empty);

            // \*.CDS
            check = new byte[] { 0x5C, 0x2A, 0x2E, 0x43, 0x44, 0x53 };
            if (fileContent.Contains(check, out position))
                return "Cactus Data Shield 200" + (includePosition ? $" (Index {position})" : string.Empty);

            // CDSPlayer
            check = new byte[] { 0x43, 0x44, 0x53, 0x50, 0x6C, 0x61, 0x79, 0x65, 0x72 };
            if (fileContent.Contains(check, out position))
                return "Cactus Data Shield 200" + (includePosition ? $" (Index {position})" : string.Empty);

            return null;
        }

        public static string CheckPath(string path, IEnumerable<string> files, bool isDirectory)
        {
            if (isDirectory)
            {
                if (files.Any(f => Path.GetFileName(f).Equals("CACTUSPJ.exe", StringComparison.OrdinalIgnoreCase))
                    || files.Any(f => Path.GetFileName(f).Equals("CDSPlayer.app", StringComparison.OrdinalIgnoreCase))
                    || files.Any(f => Path.GetFileName(f).Equals("PJSTREAM.DLL", StringComparison.OrdinalIgnoreCase))
                    || files.Any(f => Path.GetFileName(f).Equals("wmmp.exe", StringComparison.OrdinalIgnoreCase))
                    || files.Any(f => Path.GetExtension(f).Trim('.').Equals("cds", StringComparison.OrdinalIgnoreCase)))
                {
                    string versionPath = files.FirstOrDefault(f => Path.GetFileName(f).Equals("version.txt", StringComparison.OrdinalIgnoreCase));
                    if (!string.IsNullOrWhiteSpace(versionPath))
                    {
                        string version = GetVersion(versionPath);
                        if (!string.IsNullOrWhiteSpace(version))
                            return $"Cactus Data Shield {version}";
                    }

                    return "Cactus Data Shield 200";
                }
            }
            else
            {
                if (Path.GetFileName(path).Equals("CACTUSPJ.exe", StringComparison.OrdinalIgnoreCase)
                    || Path.GetFileName(path).Equals("CDSPlayer.app", StringComparison.OrdinalIgnoreCase)
                    || Path.GetFileName(path).Equals("PJSTREAM.DLL", StringComparison.OrdinalIgnoreCase)
                    || Path.GetFileName(path).Equals("wmmp.exe", StringComparison.OrdinalIgnoreCase)
                    || Path.GetExtension(path).Trim('.').Equals("cds", StringComparison.OrdinalIgnoreCase))
                {
                    return "Cactus Data Shield 200";
                }
            }

            return null;
        }

        private static string GetVersion(string path)
        {
            if (!File.Exists(path))
                return null;

            try
            {
                using (var sr = new StreamReader(path, Encoding.Default))
                {
                    return $"{sr.ReadLine().Substring(3)} ({sr.ReadLine()})";
                }
            }
            catch
            {
                return null;
            }
        }
    }
}