//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//     Version: 2.1.3.4269
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
using Application = UnityEngine.Application;
using Debug = UnityEngine.Debug;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text.RegularExpressions;
using System.Text;
using System.Xml.Linq;
using System;
using UnityEditor;
using UnityEngine;

namespace Plugins.Editor.JetBrains
{
  public class RiderAssetPostprocessor : AssetPostprocessor
  {
    public static void OnGeneratedCSProjectFiles()
    {
      if (!RiderPlugin.Enabled)
        return;
      var currentDirectory = Directory.GetCurrentDirectory();
      var projectFiles = Directory.GetFiles(currentDirectory, "*.csproj");

      foreach (var file in projectFiles)
      {
        UpgradeProjectFile(file);
      }

      var slnFile = Directory.GetFiles(currentDirectory, "*.sln").FirstOrDefault();
      if (string.IsNullOrEmpty(slnFile))
        return;
      
      RiderPlugin.Log(RiderPlugin.LoggingLevel.Verbose, string.Format("Post-processing {0}", slnFile));
      string slnAllText = File.ReadAllText(slnFile);
      const string unityProjectGuid = @"Project(""{E097FAD1-6243-4DAD-9C02-E9B9EFC3FFC1}"")";
      if (!slnAllText.Contains(unityProjectGuid))
      {
        string matchGUID = @"Project\(\""\{[A-Z0-9]{8}-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{12}\}\""\)";
        // Unity may put a random guid, unityProjectGuid will help VSTU recognize Rider-generated projects
        slnAllText = Regex.Replace(slnAllText, matchGUID, unityProjectGuid);
      }

      var lines = slnAllText.Split(new[] {Environment.NewLine}, StringSplitOptions.RemoveEmptyEntries);
      var sb = new StringBuilder();
      foreach (var line in lines)
      {
        if (line.StartsWith("Project("))
        {
          MatchCollection mc = Regex.Matches(line, "\"([^\"]*)\"");
          //RiderPlugin.Log(RiderPlugin.LoggingLevel.Info, "mc[1]: "+mc[1].Value);
          //RiderPlugin.Log(RiderPlugin.LoggingLevel.Info, "mc[2]: "+mc[2].Value);
          var to = GetFileNameWithoutExtension(mc[2].Value.Substring(1, mc[2].Value.Length-1)); // remove quotes
          //RiderPlugin.Log(RiderPlugin.LoggingLevel.Info, "to:" + to);
          //RiderPlugin.Log(RiderPlugin.LoggingLevel.Info, line);
          var newLine = line.Substring(0, mc[1].Index + 1) + to + line.Substring(mc[1].Index + mc[1].Value.Length - 1);
          sb.Append(newLine);
          //RiderPlugin.Log(RiderPlugin.LoggingLevel.Info, newLine);
        }
        else
        {
          sb.Append(line);
        }
        sb.Append(Environment.NewLine);
      }
      File.WriteAllText(slnFile, sb.ToString());
    }

    private static string GetFileNameWithoutExtension(string path)
    {
      if (string.IsNullOrEmpty(path))
        return null;
      int length;
      return (length = path.LastIndexOf('.')) == -1 ? path : path.Substring(0, length);
    }

    private static void UpgradeProjectFile(string projectFile)
    {
      RiderPlugin.Log(RiderPlugin.LoggingLevel.Verbose, string.Format("Post-processing {0}", projectFile));
      var doc = XDocument.Load(projectFile);
      var projectContentElement = doc.Root;
      XNamespace xmlns = projectContentElement.Name.NamespaceName; // do not use var

      FixTargetFrameworkVersion(projectContentElement, xmlns);
      FixSystemXml(projectContentElement, xmlns);
      SetLangVersion(projectContentElement, xmlns);
      // Unity_5_6_OR_NEWER switched to nunit 3.5
#if UNITY_5_6_OR_NEWER 
      ChangeNunitReference(projectContentElement, xmlns);
#endif
      
#if !UNITY_2017_1_OR_NEWER // Unity 2017.1 and later has this features by itself 
      SetManuallyDefinedComilingSettings(projectFile, projectContentElement, xmlns);
      SetXCodeDllReference("UnityEditor.iOS.Extensions.Xcode.dll", xmlns, projectContentElement);
      SetXCodeDllReference("UnityEditor.iOS.Extensions.Common.dll", xmlns, projectContentElement);
#endif
      ApplyManualCompilingSettingsReferences(projectContentElement, xmlns);
      doc.Save(projectFile);
    }
    
    private static void FixSystemXml(XElement projectContentElement, XNamespace xmlns)
    {
      var el = projectContentElement
        .Elements(xmlns+"ItemGroup")
        .Elements(xmlns+"Reference")
        .FirstOrDefault(a => a.Attribute("Include").Value=="System.XML");
      if (el != null)
      {
        el.Attribute("Include").Value = "System.Xml";
      }
    }

    private static void ChangeNunitReference(XElement projectContentElement, XNamespace xmlns)
    {
      var el = projectContentElement
        .Elements(xmlns+"ItemGroup")
        .Elements(xmlns+"Reference")
        .FirstOrDefault(a => a.Attribute("Include").Value=="nunit.framework");
      if (el != null)
      {
        var hintPath = el.Elements(xmlns + "HintPath").FirstOrDefault();
        if (hintPath != null)
        {
          var projectDirectory = Directory.GetParent(Application.dataPath).FullName;
          var path = Path.Combine(projectDirectory, "Library/resharper-unity-libs/nunit3.5.0/nunit.framework.dll");
          if (new FileInfo(path).Exists)
            hintPath.Value = path;
        }
      }
    }

    private static readonly string  PROJECT_MANUAL_CONFIG_ABSOLUTE_FILE_PATH = Path.Combine(UnityEngine.Application.dataPath, "mcs.rsp");
#if !UNITY_2017_1_OR_NEWER  // Unity 2017.1 and later has this features by itself
    private const string UNITY_PLAYER_PROJECT_NAME = "Assembly-CSharp.csproj";
    private const string UNITY_EDITOR_PROJECT_NAME = "Assembly-CSharp-Editor.csproj";
    private const string UNITY_UNSAFE_KEYWORD = "-unsafe";
    private const string UNITY_DEFINE_KEYWORD = "-define:";
    private static readonly string  PLAYER_PROJECT_MANUAL_CONFIG_ABSOLUTE_FILE_PATH = Path.Combine(UnityEngine.Application.dataPath, "smcs.rsp");
    private static readonly string  EDITOR_PROJECT_MANUAL_CONFIG_ABSOLUTE_FILE_PATH = Path.Combine(UnityEngine.Application.dataPath, "gmcs.rsp");

    private static void SetManuallyDefinedComilingSettings(string projectFile, XElement projectContentElement, XNamespace xmlns)
    {
      string configPath = null;

      if (IsPlayerProjectFile(projectFile) || IsEditorProjectFile(projectFile))
      {
        //Prefer mcs.rsp if it exists
        if (File.Exists(PROJECT_MANUAL_CONFIG_ABSOLUTE_FILE_PATH))
        {
          configPath = PROJECT_MANUAL_CONFIG_ABSOLUTE_FILE_PATH;
        }
        else
        {
          if (IsPlayerProjectFile(projectFile))
            configPath = PLAYER_PROJECT_MANUAL_CONFIG_ABSOLUTE_FILE_PATH;
          else if (IsEditorProjectFile(projectFile))
            configPath = EDITOR_PROJECT_MANUAL_CONFIG_ABSOLUTE_FILE_PATH;          
        }
      }

      if(!string.IsNullOrEmpty(configPath))
        ApplyManualCompilingSettings(configPath
          , projectContentElement
          , xmlns);
    }

    private static void ApplyManualCompilingSettings(string configFilePath, XElement projectContentElement, XNamespace xmlns)
    {
      if (File.Exists(configFilePath))
      {
        var configText = File.ReadAllText(configFilePath);
        if (configText.Contains(UNITY_UNSAFE_KEYWORD))
        {
          // Add AllowUnsafeBlocks to the .csproj. Unity doesn't generate it (although VSTU does).
          // Strictly necessary to compile unsafe code
          ApplyAllowUnsafeBlocks(projectContentElement, xmlns);
        }
        if (configText.Contains(UNITY_DEFINE_KEYWORD))
        {
          // defines could be
          // 1) -define:DEFINE1,DEFINE2
          // 2) -define:DEFINE1;DEFINE2
          // 3) -define:DEFINE1 -define:DEFINE2
          // 4) -define:DEFINE1,DEFINE2;DEFINE3
          // tested on "-define:DEF1;DEF2 -define:DEF3,DEF4;DEFFFF \n -define:DEF5"
          // result: DEF1, DEF2, DEF3, DEF4, DEFFFF, DEF5

          var definesList = new List<string>();
          var compileFlags = configText.Split(' ', '\n');
          foreach (var flag in compileFlags)
          {
            var f = flag.Trim();
            if (f.Contains(UNITY_DEFINE_KEYWORD))
            {
              var defineEndPos = f.IndexOf(UNITY_DEFINE_KEYWORD) + UNITY_DEFINE_KEYWORD.Length;
              var definesSubString = f.Substring(defineEndPos,f.Length - defineEndPos);
              definesSubString = definesSubString.Replace(";", ",");
              definesList.AddRange(definesSubString.Split(','));
            }
          }

          ApplyCustomDefines(definesList.ToArray(), projectContentElement, xmlns);
        }
      }
    }

    private static void ApplyCustomDefines(string[] customDefines, XElement projectContentElement, XNamespace xmlns)
    {
      var definesString = string.Join(";", customDefines);

      var DefineConstants = projectContentElement
        .Elements(xmlns+"PropertyGroup")
        .Elements(xmlns+"DefineConstants")
        .FirstOrDefault(definesConsts=> !string.IsNullOrEmpty(definesConsts.Value));

      if (DefineConstants != null)
      {
        DefineConstants.SetValue(DefineConstants.Value + ";" + definesString);
      }
    }

    private static void ApplyAllowUnsafeBlocks(XElement projectContentElement, XNamespace xmlns)
    {
      projectContentElement.AddFirst(
        new XElement(xmlns + "PropertyGroup", new XElement(xmlns + "AllowUnsafeBlocks", true)));
    }

    private static bool IsPlayerProjectFile(string projectFile)
    {
      return Path.GetFileName(projectFile) == UNITY_PLAYER_PROJECT_NAME;
    }

    private static bool IsEditorProjectFile(string projectFile)
    {
      return Path.GetFileName(projectFile) == UNITY_EDITOR_PROJECT_NAME;
    }
  
    private static void SetXCodeDllReference(string name, XNamespace xmlns, XElement projectContentElement)
    {
      string unityAppBaseFolder = Path.GetDirectoryName(EditorApplication.applicationPath);

      var xcodeDllPath = Path.Combine(unityAppBaseFolder, Path.Combine("Data/PlaybackEngines/iOSSupport", name));
      if (!File.Exists(xcodeDllPath))
        xcodeDllPath = Path.Combine(unityAppBaseFolder, Path.Combine("PlaybackEngines/iOSSupport", name));

      if (File.Exists(xcodeDllPath))
      {
        var itemGroup = new XElement(xmlns + "ItemGroup");
        var reference = new XElement(xmlns + "Reference");
        reference.Add(new XAttribute("Include", Path.GetFileNameWithoutExtension(xcodeDllPath)));
        reference.Add(new XElement(xmlns + "HintPath", xcodeDllPath));
        itemGroup.Add(reference);
        projectContentElement.Add(itemGroup);
      }
    }
#endif
    private const string UNITY_REFERENCE_KEYWORD = "-r:";
    /// <summary>
    /// Handles custom references -r: in "mcs.rsp"
    /// </summary>
    /// <param name="projectContentElement"></param>
    /// <param name="xmlns"></param>
    private static void ApplyManualCompilingSettingsReferences(XElement projectContentElement, XNamespace xmlns)
    {
      if (!File.Exists(PROJECT_MANUAL_CONFIG_ABSOLUTE_FILE_PATH))
        return;
      
      var configFilePath = PROJECT_MANUAL_CONFIG_ABSOLUTE_FILE_PATH;

      if (File.Exists(configFilePath))
      {
        var configText = File.ReadAllText(configFilePath);
        if (configText.Contains(UNITY_REFERENCE_KEYWORD))
        {
          var referenceList = new List<string>();
          var compileFlags = configText.Split(' ', '\n');
          foreach (var flag in compileFlags)
          {
            var f = flag.Trim();
            if (f.Contains(UNITY_REFERENCE_KEYWORD))
            {
              var defineEndPos = f.IndexOf(UNITY_REFERENCE_KEYWORD) + UNITY_REFERENCE_KEYWORD.Length;
              var definesSubString = f.Substring(defineEndPos,f.Length - defineEndPos);
              definesSubString = definesSubString.Replace(";", ",");
              referenceList.AddRange(definesSubString.Split(','));
            }
          }

          foreach (var referenceName in referenceList)
          {
            ApplyCustomReference(referenceName, projectContentElement, xmlns);  
          }
        }
      }
    }

    private static void ApplyCustomReference(string name, XElement projectContentElement, XNamespace xmlns)
    {
      var itemGroup = new XElement(xmlns + "ItemGroup");
      var reference = new XElement(xmlns + "Reference");
      reference.Add(new XAttribute("Include", Path.GetFileNameWithoutExtension(name)));
      itemGroup.Add(reference);
      projectContentElement.Add(itemGroup);
    }

    // Helps resolve System.Linq under mono 4 - RIDER-573
    private static void FixTargetFrameworkVersion(XElement projectElement, XNamespace xmlns)
    {
      var targetFrameworkVersion = projectElement.Elements(xmlns + "PropertyGroup")
        .Elements(xmlns + "TargetFrameworkVersion")
        .FirstOrDefault(); // Processing csproj files, which are not Unity-generated #56
      if (targetFrameworkVersion != null)
      {
        if (net46)
          targetFrameworkVersion.SetValue("v"+RiderPlugin.TargetFrameworkVersion);
        else
          targetFrameworkVersion.SetValue("v"+RiderPlugin.TargetFrameworkVersionOldMono);
        
      }
    }

    private static void SetLangVersion(XElement projectElement, XNamespace xmlns)
    {
      // Add LangVersion to the .csproj. Unity doesn't generate it (although VSTU does).
      // Not strictly necessary, as the Unity plugin for Rider will work it out, but setting
      // it makes Rider work if it's not installed.
      var langVersion = projectElement.Elements(xmlns + "PropertyGroup").Elements(xmlns + "LangVersion")
        .FirstOrDefault(); // Processing csproj files, which are not Unity-generated #56
      if (langVersion != null)
      {
        langVersion.SetValue(GetLanguageLevel());
      }
      else
      {
        projectElement.AddFirst(new XElement(xmlns + "PropertyGroup",
          new XElement(xmlns + "LangVersion", GetLanguageLevel())));
      }
    }

    private static string GetLanguageLevel()
    {
      // https://bitbucket.org/alexzzzz/unity-c-5.0-and-6.0-integration/src
      if (Directory.Exists(Path.Combine(Directory.GetCurrentDirectory(), "CSharp70Support")))
        return "7";
      if (Directory.Exists(Path.Combine(Directory.GetCurrentDirectory(), "CSharp60Support")))
        return "6";

      // Unity 5.5 supports C# 6, but only when targeting .NET 4.6. The enum doesn't exist pre Unity 5.5
#if !UNITY_5_6_OR_NEWER
      if ((int)PlayerSettings.apiCompatibilityLevel >= 3)
      #else
      if ((int) PlayerSettings.GetApiCompatibilityLevel(EditorUserBuildSettings.selectedBuildTargetGroup) >= 3)
#endif
        return "6";

      return "4";
    }
    
    private static bool net46 = 
#if NET_4_6
      true;
#else
      false;
#endif

    private static Type ourPdb2MdbDriver;
    private static Type Pdb2MdbDriver
    {
      get
      {
        if (ourPdb2MdbDriver != null)
          return ourPdb2MdbDriver;
        Assembly assembly;
        try
        {
          var path = Path.Combine(Directory.GetCurrentDirectory(), @"Library\resharper-unity-libs\pdb2mdb.exe");
          var bytes = File.ReadAllBytes(path);
          assembly = Assembly.Load(bytes);
        }
        catch (Exception)
        {
          RiderPlugin.Log(RiderPlugin.LoggingLevel.Verbose, "Loading pdb2mdb failed.");
          assembly = null;
        }

        if (assembly == null)
          return null;
        var type = assembly.GetType("Pdb2Mdb.Driver");
        if (type == null)
          return null;
        return ourPdb2MdbDriver = type;
      }
    }

    public static void OnPostprocessAllAssets(string[] importedAssets, string[] deletedAssets, string[] movedAssets, string[] movedFromPath)
    {
      if (!RiderPlugin.Enabled)
        return;
      var toBeConverted = importedAssets.Where(a => 
          a.EndsWith(".dll", StringComparison.OrdinalIgnoreCase) &&
          importedAssets.Any(a1 => a1 == Path.ChangeExtension(a, ".pdb")) &&
          importedAssets.All(b => b != Path.ChangeExtension(a, ".dll.mdb")))
        .ToArray();
      foreach (var asset in toBeConverted)
      {
        var pdb = Path.ChangeExtension(asset, ".pdb");
        if (!IsPortablePdb(pdb))
          ConvertSymbolsForAssembly(asset);
        else
          RiderPlugin.Log(RiderPlugin.LoggingLevel.Verbose, string.Format("mdb generation for Portable pdb is not supported. {0}", pdb));
      }
    }

    private static void ConvertSymbolsForAssembly(string asset)
    {
      if (Pdb2MdbDriver == null)
      {
        RiderPlugin.Log(RiderPlugin.LoggingLevel.Verbose, "FailedToConvertDebugSymbolsNoPdb2mdb.");
        return;
      }
      
      var method = Pdb2MdbDriver.GetMethod("Main", BindingFlags.Static | BindingFlags.NonPublic);
      if (method == null)
      {
        RiderPlugin.Log(RiderPlugin.LoggingLevel.Verbose, "WarningFailedToConvertDebugSymbolsPdb2mdbMainIsNull.");
        return;
      }

      var strArray = new[] { Path.GetFullPath(asset) };
      method.Invoke(null, new object[] { strArray });
    }
    
    //https://github.com/xamarin/xamarin-android/commit/4e30546f
    const uint ppdb_signature = 0x424a5342;
    public static bool IsPortablePdb(string filename)
    {
      try
      {
        using (var fs = new FileStream(filename, FileMode.Open, FileAccess.Read))
        {
          using (var br = new BinaryReader(fs))
          {
            return br.ReadUInt32() == ppdb_signature;
          }
        }
      }
      catch
      {
        return false;
      }
    }
  }
}

namespace Plugins.Editor.JetBrains
{
  [InitializeOnLoad]
  public static class RiderPlugin
  {
    private static bool Initialized;
    private static string SlnFile;

    public static void Log(LoggingLevel level, string initialText)
    {
      if (level < SelectedLoggingLevel) return;

      var text = "[Rider] "+DateTime.Now.ToString("HH:mm:ss:ff")+" [" + level + "] " + initialText;

      switch (level)
      {
        case LoggingLevel.Warning:
          Debug.LogWarning(text);
          break;
        default:
          Debug.Log(text);
          break;
      }
    }

    private static string GetDefaultApp()
    {
      var allFoundPaths = GetAllRiderPaths().Select(a=>new FileInfo(a).FullName).ToArray();
      var alreadySetPath = new FileInfo(GetExternalScriptEditor()).FullName;
      
      if (!string.IsNullOrEmpty(alreadySetPath) && RiderPathExist(alreadySetPath) && !allFoundPaths.Any() ||
          !string.IsNullOrEmpty(alreadySetPath) && RiderPathExist(alreadySetPath) && allFoundPaths.Any() &&
          allFoundPaths.Contains(alreadySetPath))
      {
        RiderPath = alreadySetPath; 
      }
      else if (!string.IsNullOrEmpty(RiderPath) && allFoundPaths.Contains(new FileInfo(RiderPath).FullName)) {}
      else
      RiderPath = allFoundPaths.FirstOrDefault();

      return RiderPath;
    }

    private static string[] GetAllRiderPaths()
    {
      switch (SystemInfoRiderPlugin.operatingSystemFamily)
      {
        case OperatingSystemFamily.Windows:
          string[] folders =
          {
            @"C:\ProgramData\Microsoft\Windows\Start Menu\Programs\JetBrains", Path.Combine(
              Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
              @"Microsoft\Windows\Start Menu\Programs\JetBrains Toolbox")
          };

          var newPathLnks = folders.Select(b => new DirectoryInfo(b)).Where(a => a.Exists)
            .SelectMany(c => c.GetFiles("*Rider*.lnk")).ToArray();
          if (newPathLnks.Any())
          {
            var newPaths = newPathLnks
              .Select(newPathLnk => new FileInfo(ShortcutResolver.Resolve(newPathLnk.FullName)))
              .Where(fi => File.Exists(fi.FullName))
              .ToArray()
              .OrderByDescending(fi => FileVersionInfo.GetVersionInfo(fi.FullName).ProductVersion)
              .Select(a => a.FullName).ToArray();

            return newPaths;
          }
          break;

        case OperatingSystemFamily.MacOSX:
          // "/Applications/*Rider*.app"
          //"~/Applications/JetBrains Toolbox/*Rider*.app"
          string[] foldersMac =
          {
            "/Applications", Path.Combine(Environment.GetEnvironmentVariable("HOME"), "Applications/JetBrains Toolbox")
          };
          var newPathsMac = foldersMac.Select(b => new DirectoryInfo(b)).Where(a => a.Exists)
            .SelectMany(c => c.GetDirectories("*Rider*.app"))
            .Select(a => a.FullName).ToArray();
          return newPathsMac;
      }
      return new string[0];
    }

    private static string GetTargetFrameworkVersionDefault(string defaultValue)
    {
      if (SystemInfoRiderPlugin.operatingSystemFamily == OperatingSystemFamily.Windows)
      {
        var dir = new DirectoryInfo(@"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework");
        if (dir.Exists)
        {
          var availableVersions = dir.GetDirectories("v*").Select(a => a.Name.Substring(1))
            .Where(v => TryCatch(v, s => { })).ToArray();
          if (availableVersions.Any() && !availableVersions.Contains(defaultValue))
          {
            defaultValue = availableVersions.OrderBy(a => new Version(a)).Last();
          }
        }
      }
      return defaultValue;
    }


    public static string TargetFrameworkVersion
    {
      get
      {
        return EditorPrefs.GetString("Rider_TargetFrameworkVersion", GetTargetFrameworkVersionDefault("4.6"));
      }
      set
      {
        TryCatch(value, val =>
        {
          EditorPrefs.SetString("Rider_TargetFrameworkVersion", val);
        });
      }
    }
    
    public static string TargetFrameworkVersionOldMono
    {
      get
      {
        return EditorPrefs.GetString("Rider_TargetFrameworkVersionOldMono", GetTargetFrameworkVersionDefault("3.5"));
      }
      set
      {
        TryCatch(value, val =>
        {
          EditorPrefs.SetString("Rider_TargetFrameworkVersionOldMono", val);
        });
      }
    }

    private static bool TryCatch(string value, Action<string> action)
    {
      try
      {
        new Version(value); // mono 2.6 doesn't support Version.TryParse
        action(value);
        return true;
      }
      catch (ArgumentException)
      {
      } // can't put loggin here because ot fire on every symbol
      catch (FormatException)
      {
      }
      return false;
    }

    public static string RiderPath
    {
      get { return EditorPrefs.GetString("Rider_RiderPath", GetAllRiderPaths().FirstOrDefault()); }
      set { EditorPrefs.SetString("Rider_RiderPath", value); }
    }

    public enum LoggingLevel
    {
      Verbose = 0,
      Info = 1,
      Warning = 2
    }

    public static LoggingLevel SelectedLoggingLevel
    {
      get { return (LoggingLevel) EditorPrefs.GetInt("Rider_SelectedLoggingLevel", 1); }
      set { EditorPrefs.SetInt("Rider_SelectedLoggingLevel", (int) value); }
    }

    public static bool RiderInitializedOnce
    {
      get { return EditorPrefs.GetBool("RiderInitializedOnce", false); }
      set { EditorPrefs.SetBool("RiderInitializedOnce", value); }
    }

    internal static bool Enabled
    {
      get
      {
        var defaultApp = GetExternalScriptEditor();
        return !string.IsNullOrEmpty(defaultApp) && Path.GetFileName(defaultApp).ToLower().Contains("rider");
      }
    }

    static RiderPlugin()
    {
      var riderPath = GetDefaultApp();
      if (!RiderPathExist(riderPath))
        return;

      AddRiderToRecentlyUsedScriptApp(riderPath, "RecentlyUsedScriptApp");
      if (!RiderInitializedOnce)
      {
        SetExternalScriptEditor(riderPath);
        RiderInitializedOnce = true;
      }
      if (Enabled)
      {
        InitRiderPlugin();
      }
    }

    private static void InitRiderPlugin()
    {
      var projectDirectory = Directory.GetParent(Application.dataPath).FullName;

      var projectName = Path.GetFileName(projectDirectory);
      SlnFile = Path.Combine(projectDirectory, string.Format("{0}.sln", projectName));

      InitializeEditorInstanceJson(projectDirectory);
      
      RiderAssetPostprocessor.OnGeneratedCSProjectFiles();

      Log(LoggingLevel.Info, "Rider plugin initialized. You may change the amount of Rider Debug output via Edit -> Preferences -> Rider -> Logging Level");
      Initialized = true;
    }

    private static void AddRiderToRecentlyUsedScriptApp(string userAppPath, string recentAppsKey)
    {
      for (int index = 0; index < 10; ++index)
      {
        string path = EditorPrefs.GetString(recentAppsKey + (object) index);
        if (File.Exists(path) && Path.GetFileName(path).ToLower().Contains("rider"))
          return;
      }
      EditorPrefs.SetString(recentAppsKey + 9, userAppPath);
    }

    private static string GetExternalScriptEditor()
    {
      return EditorPrefs.GetString("kScriptsDefaultApp");
    }

    private static void SetExternalScriptEditor(string path)
    {
      EditorPrefs.SetString("kScriptsDefaultApp", path);
    }

    private static bool RiderPathExist(string path)
    {
      if (string.IsNullOrEmpty(path))
        return false;
      // windows or mac
      var fileInfo = new FileInfo(path);
      if (!fileInfo.Name.ToLower().Contains("rider"))
        return false;
      var directoryInfo = new DirectoryInfo(path);
      return fileInfo.Exists || (SystemInfoRiderPlugin.operatingSystemFamily == OperatingSystemFamily.MacOSX &&
                                 directoryInfo.Exists);
    }

    /// <summary>
    /// Creates and deletes Library/EditorInstance.json containing version and process ID
    /// </summary>
    /// <param name="projectDirectory">Path to the project root directory</param>
    private static void InitializeEditorInstanceJson(string projectDirectory)
    {
      // Only manage EditorInstance.json for 4.x and 5.x - it's a native feature for 2017.x
#if !UNITY_2017_1_OR_NEWER
      Log(LoggingLevel.Verbose, "Writing Library/EditorInstance.json");

      var library = Path.Combine(projectDirectory, "Library");
      var editorInstanceJsonPath = Path.Combine(library, "EditorInstance.json");

      File.WriteAllText(editorInstanceJsonPath, string.Format(@"{{
  ""process_id"": {0},
  ""version"": ""{1}""
}}", Process.GetCurrentProcess().Id, Application.unityVersion));

      AppDomain.CurrentDomain.DomainUnload += (sender, args) =>
      {
        Log(LoggingLevel.Verbose, "Deleting Library/EditorInstance.json");
        File.Delete(editorInstanceJsonPath);
      };
#endif
    }

    /// <summary>
    /// Asset Open Callback (from Unity)
    /// </summary>
    /// <remarks>
    /// Called when Unity is about to open an asset.
    /// </remarks>
    [UnityEditor.Callbacks.OnOpenAssetAttribute()]
    static bool OnOpenedAsset(int instanceID, int line)
    {
      if (Enabled)
      {
        if (!Initialized)
        {
          // make sure the plugin was initialized first.
          // this can happen in case "Rider" was set as the default scripting app only after this plugin was imported.
          InitRiderPlugin();
        }

        string appPath = Path.GetDirectoryName(Application.dataPath);

        // determine asset that has been double clicked in the project view
        var selected = EditorUtility.InstanceIDToObject(instanceID);

        var assetFilePath = Path.Combine(appPath, AssetDatabase.GetAssetPath(selected));
        if (!(selected.GetType().ToString() == "UnityEditor.MonoScript" ||
              selected.GetType().ToString() == "UnityEngine.Shader" ||
              (selected.GetType().ToString() == "UnityEngine.TextAsset" &&
#if UNITY_5 || UNITY_5_5_OR_NEWER
               EditorSettings.projectGenerationUserExtensions.Contains(Path.GetExtension(assetFilePath).Substring(1))
#else
            EditorSettings.externalVersionControl.Contains(Path.GetExtension(assetFilePath).Substring(1))
#endif
              )))
          return false;

        SyncSolution(); // added to handle opening file, which was just recently created.
        if (DetectPortAndOpenFile(line, assetFilePath, SystemInfoRiderPlugin.operatingSystemFamily == OperatingSystemFamily.Windows)) 
          return true;
        var args = string.Format("{0}{1}{0} --line {2} {0}{3}{0}", "\"", SlnFile, line, assetFilePath);
        return CallRider(args);
      }

      return false;
    }


    private static bool DetectPortAndOpenFile(int line, string filePath, bool isWindows)
    {
      if (SystemInfoRiderPlugin.operatingSystemFamily == OperatingSystemFamily.Windows)
      {
        var process = GetRiderProcess();
        if (process == null)
          return false;
      }

      var ports = Enumerable.Range(63342, 20);
      var res = ports.Any(port =>
      {
        var aboutUrl = string.Format("http://localhost:{0}/api/about/", port);
        var aboutUri = new Uri(aboutUrl);

        using (var client = new WebClient())
        {
          client.Headers.Add("origin", string.Format("http://localhost:{0}", port));
          client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";

          try
          {
            var responce = CallHttpApi(aboutUri, client);
            if (responce.ToLower().Contains("rider"))
            {
              return HttpOpenFile(line, filePath, isWindows, port, client);
            }
          }
          catch (Exception e)
          {
            Log(LoggingLevel.Verbose, string.Format("Exception in DetectPortAndOpenFile: {0}", e));
          }
        }
        return false;
      });
      return res;
    }

    private static bool HttpOpenFile(int line, string filePath, bool isWindows, int port, WebClient client)
    {
      var url = string.Format("http://localhost:{0}/api/file?file={1}{2}", port, filePath,
        line < 0
          ? "&p=0"
          : "&line=" + line); // &p is needed to workaround https://youtrack.jetbrains.com/issue/IDEA-172350
      if (isWindows)
        url = string.Format(@"http://localhost:{0}/api/file/{1}{2}", port, filePath, line < 0 ? "" : ":" + line);

      var uri = new Uri(url);
      Log(LoggingLevel.Verbose, string.Format("HttpRequestOpenFile({0})", uri.AbsoluteUri));

      CallHttpApi(uri, client);
      ActivateWindow();
      return true;
    }

    private static string CallHttpApi(Uri uri, WebClient client)
    {
      var responseString = client.DownloadString(uri.AbsoluteUri);
      Log(LoggingLevel.Verbose, string.Format("CallHttpApi {0} response: {1}", uri.AbsoluteUri, responseString));
      return responseString;
    }

    private static bool CallRider(string args)
    {
      var defaultApp = GetDefaultApp();
      if (!RiderPathExist(defaultApp))
      {
        return false;
      }

      var proc = new Process();
      if (SystemInfoRiderPlugin.operatingSystemFamily == OperatingSystemFamily.MacOSX)
      {
        proc.StartInfo.FileName = "open";
        proc.StartInfo.Arguments = string.Format("-n {0}{1}{0} --args {2}", "\"", "/" + defaultApp, args);
        Log(LoggingLevel.Verbose, string.Format("{0} {1}", proc.StartInfo.FileName, proc.StartInfo.Arguments));
      }
      else
      {
        proc.StartInfo.FileName = defaultApp;
        proc.StartInfo.Arguments = args;
        Log(LoggingLevel.Verbose, string.Format("{2}{0}{2}" + " {1}", proc.StartInfo.FileName, proc.StartInfo.Arguments, "\""));
      }

      proc.StartInfo.UseShellExecute = false;
      proc.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
      proc.StartInfo.CreateNoWindow = true;
      proc.StartInfo.RedirectStandardOutput = true;
      proc.Start();

      ActivateWindow();
      return true;
    }

    private static void ActivateWindow()
    {
      if (SystemInfoRiderPlugin.operatingSystemFamily == OperatingSystemFamily.Windows)
      {
        try
        {
          var process = GetRiderProcess();
          if (process != null)
          {
            // Collect top level windows
            var topLevelWindows = User32Dll.GetTopLevelWindowHandles();
            // Get process main window title
            var windowHandle = topLevelWindows.FirstOrDefault(hwnd => User32Dll.GetWindowProcessId(hwnd) == process.Id);
            Log(LoggingLevel.Info, string.Format("ActivateWindow: {0} {1}", process.Id, windowHandle));
            if (windowHandle != IntPtr.Zero)
            {
              //User32Dll.ShowWindow(windowHandle, 9); //SW_RESTORE = 9
              User32Dll.SetForegroundWindow(windowHandle);
            }
          }
        }
        catch (Exception e)
        {
          Log(LoggingLevel.Warning, "Exception on ActivateWindow: " + e);
        }
      }
    }

    private static Process GetRiderProcess()
    {
      var process = Process.GetProcesses().FirstOrDefault(p =>
      {
        string processName;
        try
        {
          processName =
            p.ProcessName; // some processes like kaspersky antivirus throw exception on attempt to get ProcessName
        }
        catch (Exception)
        {
          return false;
        }

        return !p.HasExited && processName.ToLower().Contains("rider");
      });
      return process;
    }

    // The default "Open C# Project" menu item will use the external script editor to load the .sln
    // file, but unless Unity knows the external script editor can properly load solutions, it will
    // also launch MonoDevelop (or the OS registered app for .sln files). This menu item side steps
    // that issue, and opens the solution in Rider without opening MonoDevelop as well.
    // Unity 2017.1 and later recognise Rider as an app that can load solutions, so this menu isn't
    // needed in newer versions.
    [MenuItem("Assets/Open C# Project in Rider", false, 1000)]
    static void MenuOpenProject()
    {
      // Force the project files to be sync
      SyncSolution();

      // Load Project
      CallRider(string.Format("{0}{1}{0}", "\"", SlnFile));
    }

    [MenuItem("Assets/Open C# Project in Rider", true, 1000)]
    static bool ValidateMenuOpenProject()
    {
      return Enabled;
    }

    /// <summary>
    /// Force Unity To Write Project File
    /// </summary>
    private static void SyncSolution()
    {
      System.Type T = System.Type.GetType("UnityEditor.SyncVS,UnityEditor");
      System.Reflection.MethodInfo SyncSolution = T.GetMethod("SyncSolution",
        System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static);
      SyncSolution.Invoke(null, null);
    }

    /// <summary>
    /// JetBrains Rider Integration Preferences Item
    /// </summary>
    /// <remarks>
    /// Contains all 3 toggles: Enable/Disable; Debug On/Off; Writing Launch File On/Off
    /// </remarks>
    [PreferenceItem("Rider")]
    static void RiderPreferencesItem()
    {
      EditorGUILayout.BeginVertical();
      EditorGUI.BeginChangeCheck();

      var alternatives = GetAllRiderPaths();
      if (alternatives.Any())
      {
        int index = Array.IndexOf(alternatives, RiderPath);
        var alts = alternatives.Select(s => s.Replace("/", ":"))
          .ToArray(); // hack around https://fogbugz.unity3d.com/default.asp?940857_tirhinhe3144t4vn
        RiderPath = alternatives[EditorGUILayout.Popup("Rider executable:", index == -1 ? 0 : index, alts)];
        if (EditorGUILayout.Toggle(new GUIContent("Rider is default editor"), Enabled))
        {
          SetExternalScriptEditor(RiderPath);
          EditorGUILayout.HelpBox("Unckecking will restore default external editor.", MessageType.None);
        }
        else
        {
          SetExternalScriptEditor(string.Empty);
          EditorGUILayout.HelpBox("Checking will set Rider as default external editor", MessageType.None);
        }
      }

      GUILayout.BeginVertical();
      string status = "TargetFrameworkVersion for Runtime";
      EditorGUILayout.TextArea(status, EditorStyles.boldLabel);
        var help = @"TargetFramework >= 4.5 is recommended.";
        TargetFrameworkVersion =
          EditorGUILayout.TextField(
            new GUIContent("NET 4.6",
              help), TargetFrameworkVersion);
        EditorGUILayout.HelpBox(help, MessageType.None);  
        var helpOldMono = @"TargetFramework = 3.5 is recommended.
 - With 4.5 Rider may show ambiguous references in UniRx.";

        TargetFrameworkVersionOldMono =
          EditorGUILayout.TextField(
            new GUIContent("NET 3.5",
              helpOldMono), TargetFrameworkVersionOldMono);
        EditorGUILayout.HelpBox(helpOldMono, MessageType.None);
      
      GUILayout.EndVertical();

      EditorGUI.EndChangeCheck();

      EditorGUI.BeginChangeCheck();

      var loggingMsg =
        @"Sets the amount of Rider Debug output. If you are about to report an issue, please select Verbose logging level and attach Unity console output to the issue.";
      SelectedLoggingLevel = (LoggingLevel) EditorGUILayout.EnumPopup(new GUIContent("Logging Level", loggingMsg), SelectedLoggingLevel);
      EditorGUILayout.HelpBox(loggingMsg, MessageType.None);

      EditorGUI.EndChangeCheck();

      var url = "https://github.com/JetBrains/resharper-unity";
      LinkButton(url, url);

/*      if (GUILayout.Button("reset RiderInitializedOnce = false"))
      {
        RiderInitializedOnce = false;
      }*/

      EditorGUILayout.EndVertical();
    }

    private static void LinkButton(string caption, string url)
    {
      var style = GUI.skin.label;
      style.richText = true;
      caption = string.Format("<color=#0000FF>{0}</color>", caption);

      bool bClicked = GUILayout.Button(caption, style);

      var rect = GUILayoutUtility.GetLastRect();
      rect.width = style.CalcSize(new GUIContent(caption)).x;
      EditorGUIUtility.AddCursorRect(rect, MouseCursor.Link);

      if (bClicked)
        Application.OpenURL(url);
    }

    #region SystemInfoRiderPlugin

    private static class SystemInfoRiderPlugin
    {
      public static OperatingSystemFamily operatingSystemFamily
      {
        get
        {
#if UNITY_5_5_OR_NEWER
return SystemInfo.operatingSystemFamily;
#else
          if (SystemInfo.operatingSystem.StartsWith("Mac", StringComparison.InvariantCultureIgnoreCase))
          {
            return OperatingSystemFamily.MacOSX;
          }
          if (SystemInfo.operatingSystem.StartsWith("Win", StringComparison.InvariantCultureIgnoreCase))
          {
            return OperatingSystemFamily.Windows;
          }
          if (SystemInfo.operatingSystem.StartsWith("Lin", StringComparison.InvariantCultureIgnoreCase))
          {
            return OperatingSystemFamily.Linux;
          }
          return OperatingSystemFamily.Other;
#endif
        }
      }
    }
#if !UNITY_5_5_OR_NEWER
    enum OperatingSystemFamily
    {
      Other,
      MacOSX,
      Windows,
      Linux,
    }
#endif
    #endregion
    
    static class User32Dll
    {

      /// <summary>
      /// Gets the ID of the process that owns the window.
      /// Note that creating a <see cref="Process"/> wrapper for that is very expensive because it causes an enumeration of all the system processes to happen.
      /// </summary>
      public static int GetWindowProcessId(IntPtr hwnd)
      {
        uint dwProcessId;
        GetWindowThreadProcessId(hwnd, out dwProcessId);
        return unchecked((int) dwProcessId);
      }

      /// <summary>
      /// Lists the handles of all the top-level windows currently available in the system.
      /// </summary>
      public static List<IntPtr> GetTopLevelWindowHandles()
      {
        var retval = new List<IntPtr>();
        EnumWindowsProc callback = (hwnd, param) =>
        {
          retval.Add(hwnd);
          return 1;
        };
        EnumWindows(Marshal.GetFunctionPointerForDelegate(callback), IntPtr.Zero);
        GC.KeepAlive(callback);
        return retval;
      }

      public delegate Int32 EnumWindowsProc(IntPtr hwnd, IntPtr lParam);

      [DllImport("user32.dll", CharSet = CharSet.Unicode, PreserveSig = true, SetLastError = true,
        ExactSpelling = true)]
      public static extern Int32 EnumWindows(IntPtr lpEnumFunc, IntPtr lParam);

      [DllImport("user32.dll", SetLastError = true)]
      static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);

      [DllImport("user32.dll", CharSet = CharSet.Unicode, PreserveSig = true, SetLastError = true,
        ExactSpelling = true)]
      public static extern Int32 SetForegroundWindow(IntPtr hWnd);

      [DllImport("user32.dll", CharSet = CharSet.Unicode, PreserveSig = true, SetLastError = true,
        ExactSpelling = true)]
      public static extern UInt32 ShowWindow(IntPtr hWnd, Int32 nCmdShow);
    }
    
    static class ShortcutResolver
    {
      #region Signitures imported from http://pinvoke.net

      [DllImport("shfolder.dll", CharSet = CharSet.Auto)]
      internal static extern int SHGetFolderPath(IntPtr hwndOwner, int nFolder, IntPtr hToken, int dwFlags, StringBuilder lpszPath);

      [Flags()]
      enum SLGP_FLAGS
      {
        /// <summary>Retrieves the standard short (8.3 format) file name</summary>
        SLGP_SHORTPATH = 0x1,

        /// <summary>Retrieves the Universal Naming Convention (UNC) path name of the file</summary>
        SLGP_UNCPRIORITY = 0x2,

        /// <summary>Retrieves the raw path name. A raw path is something that might not exist and may include environment variables that need to be expanded</summary>
        SLGP_RAWPATH = 0x4
      }

      [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
      struct WIN32_FIND_DATAW
      {
        public uint dwFileAttributes;
        public long ftCreationTime;
        public long ftLastAccessTime;
        public long ftLastWriteTime;
        public uint nFileSizeHigh;
        public uint nFileSizeLow;
        public uint dwReserved0;
        public uint dwReserved1;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)] public string cFileName;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)] public string cAlternateFileName;
      }

      [Flags()]
      enum SLR_FLAGS
      {
        /// <summary>
        /// Do not display a dialog box if the link cannot be resolved. When SLR_NO_UI is set,
        /// the high-order word of fFlags can be set to a time-out value that specifies the
        /// maximum amount of time to be spent resolving the link. The function returns if the
        /// link cannot be resolved within the time-out duration. If the high-order word is set
        /// to zero, the time-out duration will be set to the default value of 3,000 milliseconds
        /// (3 seconds). To specify a value, set the high word of fFlags to the desired time-out
        /// duration, in milliseconds.
        /// </summary>
        SLR_NO_UI = 0x1,

        /// <summary>Obsolete and no longer used</summary>
        SLR_ANY_MATCH = 0x2,

        /// <summary>If the link object has changed, update its path and list of identifiers.
        /// If SLR_UPDATE is set, you do not need to call IPersistFile::IsDirty to determine
        /// whether or not the link object has changed.</summary>
        SLR_UPDATE = 0x4,

        /// <summary>Do not update the link information</summary>
        SLR_NOUPDATE = 0x8,

        /// <summary>Do not execute the search heuristics</summary>
        SLR_NOSEARCH = 0x10,

        /// <summary>Do not use distributed link tracking</summary>
        SLR_NOTRACK = 0x20,

        /// <summary>Disable distributed link tracking. By default, distributed link tracking tracks
        /// removable media across multiple devices based on the volume name. It also uses the
        /// Universal Naming Convention (UNC) path to track remote file systems whose drive letter
        /// has changed. Setting SLR_NOLINKINFO disables both types of tracking.</summary>
        SLR_NOLINKINFO = 0x40,

        /// <summary>Call the Microsoft Windows Installer</summary>
        SLR_INVOKE_MSI = 0x80
      }


      /// <summary>The IShellLink interface allows Shell links to be created, modified, and resolved</summary>
      [ComImport(), InterfaceType(ComInterfaceType.InterfaceIsIUnknown), Guid("000214F9-0000-0000-C000-000000000046")]
      interface IShellLinkW
      {
        /// <summary>Retrieves the path and file name of a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void GetPath([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszFile, int cchMaxPath, out WIN32_FIND_DATAW pfd, SLGP_FLAGS fFlags);

        /// <summary>Retrieves the list of item identifiers for a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void GetIDList(out IntPtr ppidl);

        /// <summary>Sets the pointer to an item identifier list (PIDL) for a Shell link object.</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void SetIDList(IntPtr pidl);

        /// <summary>Retrieves the description string for a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void GetDescription([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszName, int cchMaxName);

        /// <summary>Sets the description for a Shell link object. The description can be any application-defined string</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void SetDescription([MarshalAs(UnmanagedType.LPWStr)] string pszName);

        /// <summary>Retrieves the name of the working directory for a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void GetWorkingDirectory([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszDir, int cchMaxPath);

        /// <summary>Sets the name of the working directory for a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void SetWorkingDirectory([MarshalAs(UnmanagedType.LPWStr)] string pszDir);

        /// <summary>Retrieves the command-line arguments associated with a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void GetArguments([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszArgs, int cchMaxPath);

        /// <summary>Sets the command-line arguments for a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void SetArguments([MarshalAs(UnmanagedType.LPWStr)] string pszArgs);

        /// <summary>Retrieves the hot key for a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void GetHotkey(out short pwHotkey);

        /// <summary>Sets a hot key for a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void SetHotkey(short wHotkey);

        /// <summary>Retrieves the show command for a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void GetShowCmd(out int piShowCmd);

        /// <summary>Sets the show command for a Shell link object. The show command sets the initial show state of the window.</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void SetShowCmd(int iShowCmd);

        /// <summary>Retrieves the location (path and index) of the icon for a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void GetIconLocation([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszIconPath, int cchIconPath, out int piIcon);

        /// <summary>Sets the location (path and index) of the icon for a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void SetIconLocation([MarshalAs(UnmanagedType.LPWStr)] string pszIconPath, int iIcon);

        /// <summary>Sets the relative path to the Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void SetRelativePath([MarshalAs(UnmanagedType.LPWStr)] string pszPathRel, int dwReserved);

        /// <summary>Attempts to find the target of a Shell link, even if it has been moved or renamed</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void Resolve(IntPtr hwnd, SLR_FLAGS fFlags);

        /// <summary>Sets the path and file name of a Shell link object</summary>
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void SetPath([MarshalAs(UnmanagedType.LPWStr)] string pszFile);
      }

      [ComImport, Guid("0000010c-0000-0000-c000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
      public interface IPersist
      {
        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void GetClassID(out Guid pClassID);
      }


      [ComImport, Guid("0000010b-0000-0000-C000-000000000046"),
       InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
      public interface IPersistFile : IPersist
      {
        [MethodImpl(MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        new void GetClassID(out Guid pClassID);

        [MethodImpl(MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        int IsDirty();

        [MethodImpl(MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void Load([In, MarshalAs(UnmanagedType.LPWStr)] string pszFileName, uint dwMode);

        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void Save([In, MarshalAs(UnmanagedType.LPWStr)] string pszFileName, [In, MarshalAs(UnmanagedType.Bool)] bool fRemember);

        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void SaveCompleted([In, MarshalAs(UnmanagedType.LPWStr)] string pszFileName);

        [MethodImpl (MethodImplOptions.InternalCall | MethodImplOptions.PreserveSig, MethodCodeType = MethodCodeType.Runtime)]
        void GetCurFile([In, MarshalAs(UnmanagedType.LPWStr)] string ppszFileName);
      }

      const uint STGM_READ = 0;
      const int MAX_PATH = 260;

      // CLSID_ShellLink from ShlGuid.h 
      [
        ComImport(),
        Guid("00021401-0000-0000-C000-000000000046")
      ]
      public class ShellLink
      {
      }

      #endregion

      public static string Resolve(string filename)
      {
        ShellLink link = new ShellLink();
        ((IPersistFile) link).Load(filename, STGM_READ);
        // If I can get hold of the hwnd call resolve first. This handles moved and renamed files.  
        // ((IShellLinkW)link).Resolve(hwnd, 0) 
        StringBuilder sb = new StringBuilder(MAX_PATH);
        WIN32_FIND_DATAW data = new WIN32_FIND_DATAW();
        ((IShellLinkW) link).GetPath(sb, sb.Capacity, out data, 0);
        return sb.ToString();
      }
    }
  }
}

// Developed using JetBrains Rider =)
