using ShellExtensions.Interop.Common;
using System;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;

namespace ShellExtensions.Interop
{
    internal static class HandlerNativeMethods
    {
#if PREVIEW_HANDLER
        [DllImport("user32.dll")]
        internal static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

        [DllImport("user32.dll")]
        internal static extern IntPtr GetFocus();

        [DllImport("user32.dll")]
        internal static extern void SetWindowPos(
            IntPtr hWnd,
            IntPtr hWndInsertAfter,
            int x,
            int y,
            int cx,
            int cy,
            SetWindowPositionOptions flags);

        internal static readonly Guid IPreviewHandlerGuid = new Guid("8895b1c6-b41f-4c1c-a562-0d564250836f");
#endif

#if THUMBNAIL
        internal static readonly Guid IThumbnailProviderGuid = new Guid("e357fccd-a995-4576-b01f-234630154e96");
#endif

        internal static readonly Guid IInitializeWithFileGuid = new Guid("b7d14566-0509-4cce-a71f-0a554233bd9b");
        internal static readonly Guid IInitializeWithStreamGuid = new Guid("b824b49d-22ac-4161-ac8a-9916e8fa3f7f");
        //internal static readonly Guid IInitializeWithItemGuid = new Guid("7f73be3f-fb79-493c-a6c7-7ee14e245841");

        internal static readonly Guid IMarshalGuid = new Guid("00000003-0000-0000-C000-000000000046");
    }

    /// <summary>
    /// Provides means by which to initialize with a file.
    /// </summary>
    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("b7d14566-0509-4cce-a71f-0a554233bd9b")]
    interface IInitializeWithFile
    {
        /// <summary>
        /// Initializes with a file.
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="fileMode"></param>
        void Initialize([MarshalAs(UnmanagedType.LPWStr)] string filePath, AccessModes fileMode);
    }

    /// <summary>
    /// Provides means by which to initialize with a stream.
    /// </summary>
    [ComImport]
    [Guid("b824b49d-22ac-4161-ac8a-9916e8fa3f7f")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    interface IInitializeWithStream
    {
        /// <summary>
        /// Initializes with a stream.
        /// </summary>
        /// <param name="stream"></param>
        /// <param name="fileMode"></param>
        void Initialize(IStream stream, AccessModes fileMode);
    }

#if THUMBNAIL
    #region Interfaces

    /// <summary>
    /// ComVisible interface for native IThumbnailProvider
    /// </summary>
    [ComImport]
    [Guid("e357fccd-a995-4576-b01f-234630154e96")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    interface IThumbnailProvider
    {
        /// <summary>
        /// Gets a pointer to a bitmap to display as a thumbnail
        /// </summary>
        /// <param name="squareLength"></param>
        /// <param name="bitmapHandle"></param>
        /// <param name="bitmapType"></param>
        void GetThumbnail(uint squareLength, [Out] out IntPtr bitmapHandle, [Out] out uint bitmapType);
    }

    #endregion

    // <summary>
    /// Thumbnail Alpha Types
    /// </summary>
    public enum ThumbnailAlphaType
    {
        /// <summary>
        /// Let the system decide.
        /// </summary>
        Unknown = 0,

        /// <summary>
        /// No transparency
        /// </summary>
        NoAlphaChannel = 1,

        /// <summary>
        /// Has transparency
        /// </summary>
        HasAlphaChannel = 2,
    }
#endif

#if PREVIEW_HANDLER
    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("fc4801a3-2ba9-11cf-a229-00aa003d7352")]
    interface IObjectWithSite
    {
        void SetSite([In, MarshalAs(UnmanagedType.IUnknown)] object pUnkSite);
        void GetSite(ref Guid riid, [MarshalAs(UnmanagedType.IUnknown)] out object ppvSite);
    }

    [ComImport]
    [Guid("00000114-0000-0000-C000-000000000046")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    interface IOleWindow
    {
        void GetWindow(out IntPtr phwnd);
        void ContextSensitiveHelp([MarshalAs(UnmanagedType.Bool)] bool fEnterMode);
    }

    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("8895b1c6-b41f-4c1c-a562-0d564250836f")]
    interface IPreviewHandler
    {
        void SetWindow(IntPtr hwnd, ref NativeRect rect);
        void SetRect(ref NativeRect rect);
        void DoPreview();
        void Unload();
        void SetFocus();
        void QueryFocus(out IntPtr phwnd);
        [PreserveSig]
        HResult TranslateAccelerator(ref Message pmsg);
    }

    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("fec87aaf-35f9-447a-adb7-20234491401a")]
    interface IPreviewHandlerFrame
    {
        void GetWindowContext(IntPtr pinfo);
        [PreserveSig]
        HResult TranslateAccelerator(ref Message pmsg);
    }

    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("8327b13c-b63f-4b24-9b8a-d010dcc3f599")]
    interface IPreviewHandlerVisuals
    {
        void SetBackgroundColor(NativeColorRef color);
        void SetFont(ref LogFont plf);
        void SetTextColor(NativeColorRef color);
    }

    #region Structs

    /// <summary>
    /// Class for marshaling to native LogFont struct
    /// </summary>
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public class LogFont
    {
        /// <summary>
        /// Font height
        /// </summary>
        public int Height { get; set; }

        /// <summary>
        /// Font width
        /// </summary>
        public int Width { get; set; }

        /// <summary>
        /// Font escapement
        /// </summary>
        public int Escapement { get; set; }

        /// <summary>
        /// Font orientation
        /// </summary>
        public int Orientation { get; set; }

        /// <summary>
        /// Font weight
        /// </summary>
        public int Weight { get; set; }

        /// <summary>
        /// Font italic
        /// </summary>
        public byte Italic { get; set; }

        /// <summary>
        /// Font underline
        /// </summary>
        public byte Underline { get; set; }

        /// <summary>
        /// Font strikeout
        /// </summary>
        public byte Strikeout { get; set; }

        /// <summary>
        /// Font character set
        /// </summary>
        public byte CharacterSet { get; set; }

        /// <summary>
        /// Font out precision
        /// </summary>
        public byte OutPrecision { get; set; }

        /// <summary>
        /// Font clip precision
        /// </summary>
        public byte ClipPrecision { get; set; }

        /// <summary>
        /// Font quality
        /// </summary>
        public byte Quality { get; set; }

        /// <summary>
        /// Font pitch and family
        /// </summary>
        public byte PitchAndFamily { get; set; }

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
        private string faceName = string.Empty;

        /// <summary>
        /// Font face name
        /// </summary>
        public string FaceName { get => faceName; set => faceName = value; }
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct NativeColorRef
    {
        public uint Dword { get; set; }
    }

    #endregion

    [Flags]
    internal enum SetWindowPositionOptions
    {
        AsyncWindowPos = 0x4000,
        DeferErase = 0x2000,
        DrawFrame = FrameChanged,
        FrameChanged = 0x0020,  // The frame changed: send WM_NCCALCSIZE
        HideWindow = 0x0080,
        NoActivate = 0x0010,
        CoCopyBits = 0x0100,
        NoMove = 0x0002,
        NoOwnerZOrder = 0x0200,  // Don't do owner Z ordering
        NoRedraw = 0x0008,
        NoResposition = NoOwnerZOrder,
        NoSendChanging = 0x0400,  // Don't send WM_WINDOWPOSCHANGING
        NoSize = 0x0001,
        NoZOrder = 0x0004,
        ShowWindow = 0x0040
    }

    internal enum SetWindowPositionInsertAfter
    {
        NoTopMost = -2,
        TopMost = -1,
        Top = 0,
        Bottom = 1
    }
#endif
}