/*
    Shortcut resolver. Avoids using IWshRuntimeLibrary
    Proposed by Sam Saffron @ StackOverflow
*/
using System;
using System.Runtime.InteropServices;
using System.Text;

namespace Wox.Plugin.Program
{
    public class ShortcutHelper
    {
        #region Signatures
        [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;
        }

        /// <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>
            void GetPath([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszFile, int cchMaxPath, out WIN32_FIND_DATAW pfd, uint fFlags);
        }

        [ComImport, Guid("0000010c-0000-0000-c000-000000000046"),
        InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        public interface IPersist { }

        [ComImport, Guid("0000010b-0000-0000-C000-000000000046"),
        InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        public interface IPersistFile : IPersist
        {
            new void GetClassID(out Guid pClassID);
            [PreserveSig]
            void Load([In, MarshalAs(UnmanagedType.LPWStr)] string pszFileName, uint dwMode);
        }

        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 ResolveShortcut(string filename)
        {
            ShellLink link = new ShellLink();
            ((IPersistFile)link).Load(filename, STGM_READ);
            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();
        }
    }
}