using System.IO;
using UnityEditor;
using UnityEngine;
using UnityEngine.Rendering;

namespace TexturePacker
{
    internal class TextureMapIndex : ScriptableObject
    {
        public SerializedDictionary<string, TextureMapInfo> ResultGuid2TextureMap;
        public SerializedDictionary<string, TextureMapInfo> TextureGuid2TextureMap;
        public SerializedDictionary<TextureMapInfo, string> TextureMap2TextureGuid;

        public static readonly string TextureMapIndexPath = $"{TextureMapInfo.TextureMapDir}/texture_map_index.asset";

        private static TextureMapIndex instance;

        public static TextureMapIndex Instance
        {
            get
            {
                if(instance == null)
                {
                    if(File.Exists(TextureMapIndexPath))
                    {
                        instance = AssetDatabase.LoadAssetAtPath<TextureMapIndex>(TextureMapIndexPath);
                    }
                    else
                    {
                        instance = ScriptableObject.CreateInstance<TextureMapIndex>();
                        AssetDatabase.CreateAsset(instance, TextureMapIndexPath);
                    }
                }
                return instance;
            } 
        }
    }
}