namespace Cef3
{
    using System;
    using System.Collections.Generic;
    using System.Runtime.InteropServices;
    using System.Text;
    using Cef3.Interop;

    /// <summary>
    /// Structure representing cursor information. |buffer| will be
    /// |size.width|*|size.height|*4 bytes in size and represents a BGRA image with
    /// an upper-left origin.
    /// </summary>
    public unsafe sealed class CefCursorInfo
    {
        private cef_cursor_info_t* _ptr;

        internal CefCursorInfo(cef_cursor_info_t* ptr)
        {
            _ptr = ptr;
        }

        internal void Dispose()
        {
            _ptr = null;
        }

        private void ThrowIfDisposed()
        {
            if (_ptr == null) throw new ObjectDisposedException("CefCursorInfo");
        }

        public CefPoint HotSpot
        {
            get
            {
                ThrowIfDisposed();
                return new CefPoint(_ptr->hotspot.x, _ptr->hotspot.y);
            }
        }

        public float ImageScaleFactor
        {
            get
            {
                ThrowIfDisposed();
                return _ptr->image_scale_factor;
            }
        }

        public byte[] GetBuffer()
        {
            ThrowIfDisposed();
            var bufferLength = _ptr->size.width * _ptr->size.height * 4;
            var bytes = new byte[bufferLength];
            Marshal.Copy((IntPtr)_ptr->buffer, bytes, 0, bufferLength);
            return bytes;
        }

        public CefSize Size
        {
            get
            {
                ThrowIfDisposed();
                return new CefSize(_ptr->size.width, _ptr->size.height);
            }
        }
    }
}