using System;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms;

// ReSharper disable once CheckNamespace
namespace Loader
{
    public class PackedFileEntry
    {
        public PackedFileEntry(string path, int length)
        {
            Path = path;
            Length = length;
        }

        public string Path { get; private set; }

        public int Length { get; private set; }

        public override string ToString()
        {
            // ReSharper disable once UseStringInterpolation
            return string.Format("new {0}(@\"{1}\",{2})", GetType().Name, Path, Length);
        }
    }

    partial class Program
    {
        private static string _targetAssemblyName;
        private static string _targetFileName;
        private static Assembly _targetAssembly;
        private static int _packageLength;
        private static byte[] _compressLibrary;
        private static string _tempPath;

        [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool SetDllDirectory(string lpPathName);

        // ReSharper disable once UnusedMember.Local
        private static void RealMain(string[] args)
        {
            var pname = Path.GetFileNameWithoutExtension(Application.ExecutablePath);
            try
            {
                pname = Application.ProductName;
            }
            catch
            {
                //dont care! XP BULL SHIT
            }


            var frmLoading = new Form();
            frmLoading.StartPosition = FormStartPosition.CenterScreen;
            frmLoading.ControlBox = false;
            frmLoading.Text = "Loading... - " + pname;
            frmLoading.Width = 480;
            frmLoading.Height = 128;
            frmLoading.FormBorderStyle = FormBorderStyle.FixedSingle;

            frmLoading.Show();
            Application.DoEvents();

            Init();
            Unpack();
            AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;
            Load();

            frmLoading.Close();
            Application.DoEvents();

            Execute(args);
        }

        private static Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
        {
            if (args.Name == _targetAssemblyName)
            {
                return _targetAssembly;
            }
            return null;
        }

        private static void Unpack()
        {
            var bufPackageCompressed = new byte[_packageLength];

            using (
                var fs = new FileStream(Assembly.GetExecutingAssembly().Location, FileMode.Open, FileAccess.Read, FileShare.Read)
                )
            {
                fs.Seek(-_packageLength, SeekOrigin.End);
                fs.Read(bufPackageCompressed, 0, bufPackageCompressed.Length);
            }

            _tempPath = Path.Combine(
                Path.GetTempPath(),
                // ReSharper disable once UseStringInterpolation
                string.Format("Aio1ef-{0}-{1}-{2}", new FileInfo(Assembly.GetExecutingAssembly().Location).LastWriteTime.Ticks.ToString("X16"), _targetFileName, HashData(bufPackageCompressed))
            );

            if (!Directory.Exists(_tempPath) || !PackedFiles.All(p => File.Exists(Path.Combine(_tempPath + p.Path))))
            {
                var bufPackage = DecompressData(bufPackageCompressed);
                Directory.CreateDirectory(_tempPath);
                using (var ms = new MemoryStream(bufPackage))
                {
                    foreach (var entry in PackedFiles)
                    {
                        var bufPerFile = new byte[entry.Length];
                        ms.Read(bufPerFile, 0, bufPerFile.Length);

                        var fullFilePath = Path.Combine(_tempPath, entry.Path);
                        var fillFileDir = Path.GetDirectoryName(fullFilePath);

                        // ReSharper disable AssignNullToNotNullAttribute
                        if (Directory.Exists(fillFileDir) == false)
                        {
                            Directory.CreateDirectory(fillFileDir);
                        }
                        // ReSharper restore AssignNullToNotNullAttribute

                        File.WriteAllBytes(fullFilePath, bufPerFile);
                    }
                }
            }
            //else
            //{
            //  //cached
            //}

            SetDllDirectory(_tempPath);
            Environment.SetEnvironmentVariable("path", _tempPath + ";" + Environment.GetEnvironmentVariable("path"));
            Environment.CurrentDirectory = _tempPath;
            AppDomain.CurrentDomain.SetupInformation.PrivateBinPath = _tempPath;
        }

        private static void Load()
        {
            _targetAssembly = Assembly.LoadFrom(Path.Combine(_tempPath, _targetFileName));
        }

        // ReSharper disable once SuggestBaseTypeForParameter
        private static void Execute(string[] args)
        {
            var ep = _targetAssembly.EntryPoint;
            ep.Invoke(null, ep.GetParameters().Length == 0 ? null : new object[] { args });
        }
    }
}