using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using RecrownedAthenaeum.DataTypes;
using RecrownedAthenaeum.UI.Skin.Definitions;
using System;
using System.Collections.Generic;

namespace RecrownedAthenaeum.UI.Skin
{
    /// <summary>
    /// A skin is used to group a theme which can then be applied to the UI via the use of modules.
    /// </summary>
    public class Skin
    {
        /// <summary>
        /// Texture atlas containing the skins textures.
        /// </summary>
        public readonly TextureAtlas textureAtlas;
        /// <summary>
        /// Colors stored in this skin.
        /// </summary>
        public readonly Dictionary<string, Color> colors;
        /// <summary>
        /// Fonts stored in this skin.
        /// </summary>
        public readonly Dictionary<string, SpriteFont> fonts;
        Dictionary<Type, Dictionary<string, ISkinDefinition>> definitions;

        /// <summary>
        /// Creates a basic unfilled skin.
        /// </summary>
        /// <param name="textureAtlas">The texture atlas to use for this skin.</param>
        public Skin(TextureAtlas textureAtlas)
        {
            this.textureAtlas = textureAtlas;
            colors = new Dictionary<string, Color>();
            fonts = new Dictionary<string, SpriteFont>();
            definitions = new Dictionary<Type, Dictionary<string, ISkinDefinition>>();
        }

        /// <summary>
        /// Draws a region from the texture atlas.
        /// </summary>
        /// <param name="regionName">Region to draw.</param>
        /// <param name="color">The color to tint the region.</param>
        /// <param name="batch">The batch to use.</param>
        /// <param name="destination">The destination to draw to.</param>
        /// <param name="rotation">The rotation to use in radians.</param>
        /// <param name="origin">The origin for the rotation.</param>
        public void Draw(string regionName, string color, SpriteBatch batch, Rectangle destination, float rotation = 0, Vector2 origin = default(Vector2))
        {
            textureAtlas.Draw(regionName, batch, destination, colors[color], rotation, origin);
        }

        /// <summary>
        /// Returns an <see cref="ISkinDefinition"/> of the given name and type.
        /// </summary>
        /// <param name="definitionName">Name of definition of the <paramref name="type"/></param>
        /// <param name="type">The UIModule the definition defines.</param>
        /// <returns>The interface for the definition.</returns>
        public ISkinDefinition ObtainDefinition(string definitionName, Type type)
        {
            if (definitionName == null) definitionName = "default";
            if (!definitions.ContainsKey(type) || !definitions[type].ContainsKey(definitionName)) throw new ArgumentException("Could not find skin of type " + type.Name + " with name " + definitionName);
            return definitions[type][definitionName];
        }

        /// <summary>
        /// Returns the default <see cref="ISkinDefinition"/> of the given parameters.
        /// </summary>
        /// <param name="type">The type of definition the default should be coming from.</param>
        /// <returns>The default definition for the given type.</returns>
        public ISkinDefinition ObtainDefinition(Type type)
        {
            return ObtainDefinition(null, type);
        }

        /// <summary>
        /// Returns the proper definition for the given parameters or throws exception in the case the requested definition does not exist.
        /// </summary>
        /// <typeparam name="T">Convenience to cast to the needed definition type.</typeparam>
        /// <param name="definitionName">The name of the definition.</param>
        /// <param name="type">UIModule type the definition defines.</param>
        /// <returns>The definition cast to T.</returns>
        public T ObtainDefinition<T>(string definitionName, Type type) where T : ISkinDefinition
        {
            if (definitionName == null) definitionName = "default";
            return (T)ObtainDefinition(definitionName, type);
        }

        /// <summary>
        /// Returns the default definition.
        /// </summary>
        /// <typeparam name="T">Convenience to cast to T.</typeparam>
        /// <param name="type">The type of the UIModule to retrieve the default from.</param>
        /// <returns>The default definition for the given type.</returns>
        public T ObtainDefinition<T>(Type type) where T : ISkinDefinition
        {
            return ObtainDefinition<T>(null, type);
        }

        /// <summary>
        /// Adds the definition.
        /// </summary>
        /// <param name="definitionName">The name of the definition.</param>
        /// <param name="skinDefinition">The definition itself.</param>
        public void AddDefinition(string definitionName, ISkinDefinition skinDefinition)
        {
            if (!definitions.ContainsKey(skinDefinition.UIModuleType))
            {
                definitions.Add(skinDefinition.UIModuleType, new Dictionary<string, ISkinDefinition>());
            } else if (definitions[skinDefinition.UIModuleType].ContainsKey(definitionName)) throw new ArgumentException("Type of definition with that name already exists!");

            definitions[skinDefinition.UIModuleType].Add(definitionName, skinDefinition);
        }

        /// <summary>
        /// Removes the definition.
        /// </summary>
        /// <param name="definitionName">The name of the definition.</param>
        /// <param name="definitionType">The type of the definition.</param>
        public void RemoveDefinition(string definitionName, Type definitionType)
        {
            if (definitions.ContainsKey(definitionType) && definitions[definitionType].ContainsKey(definitionName))
            {
                definitions[definitionType].Remove(definitionName);
            } else
            {
                throw new ArgumentException("a definition of type " + definitionType.Name + " with a name of " + definitionName + " does not exist.");
            }
        }
    }
}