//********************************** Banshee Engine (www.banshee3d.com) **************************************************//
//**************** Copyright (c) 2016 Marko Pintera (marko.pintera@gmail.com). All rights reserved. **********************//
using System;
using System.Runtime.CompilerServices;

namespace BansheeEngine
{
    /// <summary>
    /// Type of scaling modes for GUI images.
    /// </summary>
    public enum GUIImageScaleMode // Note: Must match C++ enum GUIImageScaleMode
	{
        /// <summary>
        /// Image will stretch non-uniformly in all dimensions in order to cover the assigned area fully.
        /// </summary>
		StretchToFit,
        /// <summary>
        /// Image will scale uniformly until one dimension is aligned with the assigned area. Remaining dimension might have empty space.
        /// </summary>
		ScaleToFit,
        /// <summary>
        /// Image will scale uniformly until both dimensions are larger or aligned with the assigned area. Remaining dimension might be cropped.
        /// </summary>
		CropToFit,
        /// <summary>
        /// Image will keep its original size, but will repeat in order to fill the assigned area.
        /// </summary>
		RepeatToFit
	};

    /// <summary>
    /// A GUI element that displays a texture.
    /// </summary>
    public sealed class GUITexture : GUIElement
    {
        /// <summary>
        /// Creates a new texture element.
        /// </summary>
        /// <param name="texture">Texture to display. If this is null then the texture specified by the style will 
        ///                       be used.</param>
        /// <param name="scale">Scale mode to use when sizing the texture.</param>
        /// <param name="transparent">Determines should the texture be rendered with transparency active.</param>
        /// <param name="style">Optional style to use for the element. Style controls the look of the element, as well as 
        ///                     default layout options. Style will be retrieved from the active GUISkin. If not specified 
        ///                     default element style is used.</param>
        /// <param name="options">Options that allow you to control how is the element  positioned and sized. This will 
        ///                       override any similar options set by style.</param>
        public GUITexture(SpriteTexture texture, GUIImageScaleMode scale, bool transparent, string style, params GUIOption[] options)
        {
            Internal_CreateInstance(this, texture, scale, transparent, style, options);
        }

        /// <summary>
        /// Creates a new texture element.
        /// </summary>
        /// <param name="texture">Texture to display. If this is null then the texture specified by the style will 
        ///                       be used.</param>
        /// <param name="scale">Scale mode to use when sizing the texture.</param>
        /// <param name="transparent">Determines should the texture be rendered with transparency active.</param>
        /// <param name="options">Options that allow you to control how is the element  positioned and sized. This will 
        ///                       override any similar options set by style.</param>
        public GUITexture(SpriteTexture texture, GUIImageScaleMode scale, bool transparent, params GUIOption[] options)
        {
            Internal_CreateInstance(this, texture, scale, transparent, "", options);
        }

        /// <summary>
        /// Creates a new texture element. Texture will use the default StretchToFit scaling.
        /// </summary>
        /// <param name="texture">Texture to display. If this is null then the texture specified by the style will 
        ///                       be used.</param>
        /// <param name="transparent">Determines should the texture be rendered with transparency active.</param>
        /// <param name="style">Optional style to use for the element. Style controls the look of the element, as well as 
        ///                     default layout options. Style will be retrieved from the active GUISkin. If not specified 
        ///                     default element style is used.</param>
        /// <param name="options">Options that allow you to control how is the element  positioned and sized. This will 
        ///                       override any similar options set by style.</param>
        public GUITexture(SpriteTexture texture, bool transparent, string style, params GUIOption[] options)
        {
            Internal_CreateInstance(this, texture, GUIImageScaleMode.StretchToFit, transparent, style, options);
        }

        /// <summary>
        /// Creates a new texture element. Texture will use the default StretchToFit scaling.
        /// </summary>
        /// <param name="texture">Texture to display. If this is null then the texture specified by the style will 
        ///                       be used.</param>
        /// <param name="transparent">Determines should the texture be rendered with transparency active.</param>
        /// <param name="options">Options that allow you to control how is the element  positioned and sized. This will 
        ///                       override any similar options set by style.</param>
        public GUITexture(SpriteTexture texture, bool transparent, params GUIOption[] options)
        {
            Internal_CreateInstance(this, texture, GUIImageScaleMode.StretchToFit, transparent, "", options);
        }

        /// <summary>
        /// Creates a new texture element with transparency active.
        /// </summary>
        /// <param name="texture">Texture to display. If this is null then the texture specified by the style will 
        ///                       be used.</param>
        /// <param name="scale">Scale mode to use when sizing the texture.</param>
        /// <param name="style">Optional style to use for the element. Style controls the look of the element, as well as 
        ///                     default layout options. Style will be retrieved from the active GUISkin. If not specified 
        ///                     default element style is used.</param>
        /// <param name="options">Options that allow you to control how is the element  positioned and sized. This will 
        ///                       override any similar options set by style.</param>
        public GUITexture(SpriteTexture texture, GUIImageScaleMode scale, string style, params GUIOption[] options)
        {
            Internal_CreateInstance(this, texture, scale, true, style, options);
        }

        /// <summary>
        /// Creates a new texture element with transparency active.
        /// </summary>
        /// <param name="texture">Texture to display. If this is null then the texture specified by the style will 
        ///                       be used.</param>
        /// <param name="scale">Scale mode to use when sizing the texture.</param>
        /// <param name="options">Options that allow you to control how is the element  positioned and sized. This will 
        ///                       override any similar options set by style.</param>
        public GUITexture(SpriteTexture texture, GUIImageScaleMode scale, params GUIOption[] options)
        {
            Internal_CreateInstance(this, texture, scale, true, "", options);
        }

        /// <summary>
        /// Creates a new texture element with transparency active. Texture will use the default StretchToFit scaling.
        /// </summary>
        /// <param name="texture">Texture to display. If this is null then the texture specified by the style will 
        ///                       be used.</param>
        /// <param name="style">Optional style to use for the element. Style controls the look of the element, as well as 
        ///                     default layout options. Style will be retrieved from the active GUISkin. If not specified 
        ///                     default element style is used.</param>
        /// <param name="options">Options that allow you to control how is the element  positioned and sized. This will 
        ///                       override any similar options set by style.</param>
        public GUITexture(SpriteTexture texture, string style, params GUIOption[] options)
        {
            Internal_CreateInstance(this, texture, GUIImageScaleMode.StretchToFit, true, style, options);
        }

        /// <summary>
        /// Creates a new texture element with transparency active. Texture will use the default StretchToFit scaling.
        /// </summary>
        /// <param name="texture">Texture to display. If this is null then the texture specified by the style will 
        ///                       be used.</param>
        /// <param name="options">Options that allow you to control how is the element  positioned and sized. This will 
        ///                       override any similar options set by style.</param>
        public GUITexture(SpriteTexture texture, params GUIOption[] options)
        {
            Internal_CreateInstance(this, texture, GUIImageScaleMode.StretchToFit, true, "", options);
        }

        /// <summary>
        /// Sets the texture to display.
        /// </summary>
        /// <param name="texture">Texture to display. If this is null then the texture specified by the style will 
        ///                       be used.</param>
        public void SetTexture(SpriteTexture texture)
        {
            Internal_SetTexture(mCachedPtr, texture);
        }

        /// <summary>
        /// Colors the element with a specific tint.
        /// </summary>
        /// <param name="color">Tint to apply to the element.</param>
        public void SetTint(Color color)
        {
            Internal_SetTint(mCachedPtr, ref color);
        }

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern void Internal_CreateInstance(GUITexture instance, SpriteTexture texture,
            GUIImageScaleMode scale, bool transparent, string style, GUIOption[] options);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern void Internal_SetTexture(IntPtr nativeInstance, SpriteTexture texture);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern void Internal_SetTint(IntPtr nativeInstance, ref Color color);
    }
}
