using System;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;
using System.Text;

namespace PeercordInstaller
{
    [ComImport, Guid("00021401-0000-0000-C000-000000000046")]
    internal class ShellLink { }

    [ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown), Guid("000214F9-0000-0000-C000-000000000046")]
    internal interface IShellLinkW
    {
        void GetPath([Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszFile, int cchMaxPath, out IntPtr pfd, int fFlags);
        void GetIDList(out IntPtr ppidl);
        void SetIDList(IntPtr pidl);
        void GetDescription([Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszName, int cchMaxName);
        void SetDescription([MarshalAs(UnmanagedType.LPWStr)] string pszName);
        void GetWorkingDirectory([Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszDir, int cchMaxPath);
        void SetWorkingDirectory([MarshalAs(UnmanagedType.LPWStr)] string pszDir);
        void GetArguments([Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszArgs, int cchMaxPath);
        void SetArguments([MarshalAs(UnmanagedType.LPWStr)] string pszArgs);
        void GetHotkey(out short pwHotkey);
        void SetHotkey(short wHotkey);
        void GetShowCmd(out int piShowCmd);
        void SetShowCmd(int iShowCmd);
        void GetIconLocation([Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszIconPath, int cchIconPath, out int piIcon);
        void SetIconLocation([MarshalAs(UnmanagedType.LPWStr)] string pszIconPath, int iIcon);
        void SetRelativePath([MarshalAs(UnmanagedType.LPWStr)] string pszPathRel, int dwReserved);
        void Resolve(IntPtr hwnd, int fFlags);
        void SetPath([MarshalAs(UnmanagedType.LPWStr)] string pszFile);
    }

    [ComImport, Guid("0000010b-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    internal interface IPersistFile
    {
        void GetClassID(out Guid pClassID);
        [PreserveSig] int IsDirty();
        void Load([MarshalAs(UnmanagedType.LPWStr)] string pszFileName, uint dwMode);
        void Save([MarshalAs(UnmanagedType.LPWStr)] string pszFileName, [MarshalAs(UnmanagedType.Bool)] bool fRemember);
        void SaveCompleted([MarshalAs(UnmanagedType.LPWStr)] string pszFileName);
        void GetCurFile([MarshalAs(UnmanagedType.LPWStr)] out string ppszFileName);
    }

    [ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown), Guid("886d8eeb-8cf2-4446-8d02-cdba1dbdcf99")]
    internal interface IPropertyStore
    {
        void GetCount(out uint cProps);
        void GetAt(uint iProp, out PropertyKey pkey);
        void GetValue(ref PropertyKey key, out PropVariant pv);
        void SetValue(ref PropertyKey key, ref PropVariant pv);
        void Commit();
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct PropertyKey
    {
        public Guid fmtid;
        public UIntPtr pid;
        public PropertyKey(Guid guid, uint id) { fmtid = guid; pid = (UIntPtr)id; }
    }

    [StructLayout(LayoutKind.Explicit)]
    internal struct PropVariant
    {
        [FieldOffset(0)] public ushort vt;
        [FieldOffset(8)] public IntPtr ptr;
        public void SetString(string value) { vt = 31; ptr = Marshal.StringToCoTaskMemUni(value); } // 31 = VT_LPWSTR
    }
}