using System;
using System.Drawing;
using System.Windows.Forms;

namespace DevComponents.DotNetBar
{
    /// <summary>
    /// Serves as integration of regular Image class and Icon class
    /// </summary>
    internal class CompositeImage : IDisposable
    {
        private bool m_DisposeImage = false;

        private Image m_Image = null;
        private Icon m_Icon = null;
        private Size m_ImageSizeOverride = Size.Empty;
        private ImageList m_ImageList = null;
        private int m_ImageIndex = -1;

        public CompositeImage(int imageIndex, ImageList imageList)
        {
            m_ImageIndex = imageIndex;
            m_ImageList = imageList;
        }

        public CompositeImage(Image image, bool dispose)
        {
            m_Image = image;
            m_DisposeImage = dispose;
        }
        public CompositeImage(Icon icon, bool dispose)
        {
            m_Icon = icon;
            m_DisposeImage = dispose;
        }
        public CompositeImage(Image image, bool dispose, Size overrideSize)
        {
            m_Image = image;
            m_DisposeImage = dispose;
            m_ImageSizeOverride = overrideSize;
        }
        public CompositeImage(Icon icon, bool dispose, Size overrideSize)
        {
            m_Icon = icon;
            m_DisposeImage = dispose;
            m_ImageSizeOverride = overrideSize;
        }
        ~CompositeImage()  // destructor
        {
            if (m_DisposeImage && (m_Image != null || m_Icon != null))
            {
                Dispose();
            }
        }

        public void Dispose()
        {
            if (m_DisposeImage)
            {
                if (m_Image != null)
                    m_Image.Dispose();
                if (m_Icon != null)
                    m_Icon.Dispose();
            }

            m_Image = null;
            m_Icon = null;
        }

        public void DrawImage(Graphics g, Rectangle rect)
        {
            if (m_Image != null)
                g.DrawImage(m_Image, rect);
            else if (m_Icon != null)
                DrawIcon(g, rect);
            else if (m_ImageIndex >= 0 && m_ImageList != null && m_ImageIndex < m_ImageList.Images.Count)
                m_ImageList.Draw(g, rect.X, rect.Y, rect.Width, rect.Height, m_ImageIndex);
        }

        private void DrawIcon(Graphics g, Rectangle rect)
        {
            if (System.Environment.Version.Build <= 3705 && System.Environment.Version.Revision == 288 && System.Environment.Version.Major == 1 && System.Environment.Version.Minor == 0)
            {
                if (g.ClipBounds.IntersectsWith(rect) && rect.Width > 0 && rect.Height > 0 && m_Icon.Handle != IntPtr.Zero)
                {
                    IntPtr hdc = g.GetHdc();
                    try
                    {
                        NativeFunctions.DrawIconEx(hdc, rect.X, rect.Y, m_Icon.Handle, rect.Width, rect.Height, 0, IntPtr.Zero, 3);
                    }
                    finally
                    {
                        g.ReleaseHdc(hdc);
                    }
                }
            }
            else if (rect.Width > 0 && rect.Height > 0 && m_Icon.Handle != IntPtr.Zero)
            {
                try
                {
                    g.DrawIcon(m_Icon, rect);
                }
                catch { }
            }
        }

        public void DrawImage(Graphics g, Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes imageAttrs)
        {
            if (m_Image != null)
            {
                g.DrawImage(m_Image, destRect, srcX, srcY, srcWidth, srcHeight, srcUnit, imageAttrs);
            }
            else if (m_Icon != null)
            {
                // Attempt to solve issues with icon drawing...
                //DrawIcon(g,destRect);
                Bitmap bmp = new Bitmap(this.Width, this.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
                bmp.MakeTransparent();
                Graphics gBmp = Graphics.FromImage(bmp);
                gBmp.DrawIcon(m_Icon, 0, 0);
                gBmp.Dispose();
                g.DrawImage(bmp, destRect, srcX, srcY, srcWidth, srcHeight, srcUnit, imageAttrs);
                bmp.Dispose();
            }
            else if (m_ImageIndex >= 0 && m_ImageList != null && m_ImageIndex < m_ImageList.Images.Count)
                m_ImageList.Draw(g, srcX, srcY, srcWidth, srcHeight, m_ImageIndex);
        }

        public bool IsIcon
        {
            get { return (m_Icon != null); }
        }

        public int Width
        {
            get
            {
                if (!m_ImageSizeOverride.IsEmpty)
                    return GetSize(m_ImageSizeOverride.Width);
                if (m_Image != null)
                    return GetSize(m_Image.Width);
                if (m_Icon != null)
                    return GetSize(m_Icon.Width);
                if (m_ImageIndex >= 0 && m_ImageList != null)
                    return GetSize(m_ImageList.ImageSize.Width);
                return 0;
            }
        }

        public int Height
        {
            get
            {
                if (!m_ImageSizeOverride.IsEmpty)
                    return GetSize(m_ImageSizeOverride.Height);
                if (m_Image != null)
                    return GetSize(m_Image.Height);
                if (m_Icon != null)
                    return GetSize(m_Icon.Height);
                if (m_ImageIndex >= 0 && m_ImageList != null)
                    return GetSize(m_ImageList.ImageSize.Height);
                return 0;
            }
        }

        private int GetSize(int height)
        {
            return (Dpi.AutoScaleImages ? Dpi.Height(height) : height);
        }
        private Size GetSize(Size size)
        {
            return (Dpi.AutoScaleImages ? Dpi.Size(size) : size);
        }

        public System.Drawing.Size Size
        {
            get
            {
                if (!m_ImageSizeOverride.IsEmpty)
                    return GetSize(m_ImageSizeOverride);
                if (m_Image != null)
                    return GetSize(m_Image.Size);
                if (m_Icon != null)
                    return GetSize(m_Icon.Size);
                if (m_ImageIndex >= 0 && m_ImageList != null)
                    return GetSize(m_ImageList.ImageSize);
                return System.Drawing.Size.Empty;
            }
        }

        public System.Drawing.Image Image
        {
            get
            {
                if (m_ImageIndex >= 0 && m_ImageList != null)
                    return m_ImageList.Images[m_ImageIndex];
                return m_Image;
            }
        }

        public System.Drawing.Icon Icon
        {
            get { return m_Icon; }
        }

        internal int RealHeight
        {
            get
            {
                if (m_Image != null)
                    return GetSize(m_Image.Height);
                if (m_Icon != null)
                    return GetSize(m_Icon.Height);
                if (m_ImageIndex >= 0 && m_ImageList != null)
                    return GetSize(m_ImageList.ImageSize.Height);
                return 0;
            }
        }

        internal int RealWidth
        {
            get
            {
                if (m_Image != null)
                    return GetSize(m_Image.Width);
                if (m_Icon != null)
                    return GetSize(m_Icon.Width);
                if (m_ImageIndex >= 0 && m_ImageList != null)
                    return GetSize(m_ImageList.ImageSize.Width);
                return 0;
            }
        }

        internal int ActualHeight
        {
            get
            {
                if (m_Image != null)
                    return m_Image.Height;
                if (m_Icon != null)
                    return m_Icon.Height;
                if (m_ImageIndex >= 0 && m_ImageList != null)
                    return m_ImageList.ImageSize.Height;
                return 0;
            }
        }

        internal int ActualWidth
        {
            get
            {
                if (m_Image != null)
                    return (m_Image.Width);
                if (m_Icon != null)
                    return (m_Icon.Width);
                if (m_ImageIndex >= 0 && m_ImageList != null)
                    return (m_ImageList.ImageSize.Width);
                return 0;
            }
        }
    }
}