using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace StardustCore.UIUtilities
{
    /// <summary>
    /// A class that keeps track of a collection of textures that are layered one on top of the others.
    /// </summary>
    public class LayeredTexture
    {
        public List<KeyValuePair<Rectangle,Texture2DExtended>> textureLayers;

        public LayeredTexture(List<KeyValuePair<Rectangle,Texture2DExtended>> textures)
        {
            this.textureLayers = textures;
        }

        /// <summary>
        /// Adds a new texture as the top layer.
        /// </summary>
        /// <param name="texture"></param>
        public void addTexture(KeyValuePair<Rectangle,Texture2DExtended> texture)
        {
            this.textureLayers.Add(texture);
        }

        /// <summary>
        /// Adds a new texture at a specific layer depth.
        /// </summary>
        /// <param name="texture"></param>
        /// <param name="index"></param>
        public void addTexture(KeyValuePair<Rectangle, Texture2DExtended>texture , int index)
        {
            this.textureLayers.Insert(index, texture);
        }

        public LayeredTexture Copy()
        {
            return new LayeredTexture(this.textureLayers);
        }

        public void draw(SpriteBatch b, Color color, float layerDepth)
        {
            foreach(var texture in this.textureLayers)
            {
                b.Draw(texture.Value.getTexture(), texture.Key, color);
            }
        }

    }
}