using System;
using System.Collections.Generic;
using RecrownedGTK.Graphics.Render;
using RecrownedGTK.Types;
using RecrownedGTK.Graphics.UI.SkinSystem.Definitions;
using OpenTK.Graphics;
using OpenTK;

namespace RecrownedGTK.Graphics.UI.SkinSystem
{
    internal class MergedSkin : ISkin
    {
        /// <summary>
        /// The skin to try to use first.
        /// </summary>
        public ISkin mainSkin;

        /// <summary>
        /// The fallback skin.
        /// </summary>
        public ISkin alternateSkin;

        public Texture2D CursorTexture
        {
            get
            {
                if (mainSkin.CursorTexture != null) {
                    return mainSkin.CursorTexture;
                } else {
                    return alternateSkin.CursorTexture;
                }
            }
        }

        public void Draw(string regionName, string color, ConsistentSpriteBatch batch, Rectangle destination, float rotation = 0, Vector2 origin = default(Vector2))
        {
            try
            {
                mainSkin.Draw(regionName, color, batch, destination, rotation, origin);
            } catch (KeyNotFoundException)
            {
                alternateSkin.Draw(regionName, color, batch, destination, rotation, origin);
            } catch (NullReferenceException)
            {
                alternateSkin.Draw(regionName, color, batch, destination, rotation, origin);
            }
        }

        public Color4 GetColor(string name)
        {
            try
            {
                return mainSkin.GetColor(name);
            } catch (KeyNotFoundException)
            {
                return alternateSkin.GetColor(name);
            }
            catch (NullReferenceException)
            {
                return alternateSkin.GetColor(name);
            }
        }

        public TextureAtlas.Region GetTextureAtlasRegion(string name, bool required = false)
        {
            try
            {
                return mainSkin.GetTextureAtlasRegion(name);
            }
            catch (NullReferenceException)
            {
                return alternateSkin.GetTextureAtlasRegion(name, required);
            }
        }

        public T ObtainDefinition<T>(string definitionName = null) where T : SkinDefinitionData
        {
            try
            {
                return mainSkin.ObtainDefinition<T>(definitionName);
            }
            catch (NullReferenceException)
            {
                return alternateSkin.ObtainDefinition<T>(definitionName);
            }
        }
    }
}