using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using UnityEngine;
using Syntriax.Modules.Movement.VariableMovement;

namespace Syntriax.Modules.Movement.Config
{
    public class VariableMovementFactory : MonoBehaviour
    {
        private const string Name = "Variable Movement Factory";
        private const int InitialCapacity = 64;
        private const string ResourceDirectoryToCollections = "Modules/Syntriax/Movement/Variable Movement/Collections/";

        private static VariableMovementFactory _instance = null;
        public static VariableMovementFactory Instance
        {
            get
            {
                if (_instance == null)
                    _instance = new GameObject(Name).AddComponent<VariableMovementFactory>();

                return _instance;
            }
        }

        private Dictionary<string, VMCollection> _collections = null;
        public Dictionary<string, VMCollection> Collections
        {
            get
            {
                if (_collections == null)
                    Initialize();

                return _collections;
            }
        }

        private void Start()
        {
            if (_instance == this)
                return;

            Destroy(this);
        }

        public void Initialize()
        {
            if (_collections == null)
                _collections = new Dictionary<string, VMCollection>(InitialCapacity);

            Reset();

            foreach (TextAsset definitionTextAsset in UnityEngine.Resources.LoadAll<TextAsset>(ResourceDirectoryToCollections))
                AddToFactoryWithJSON(definitionTextAsset.text);
        }

        public void AddToFactoryWithJSON(string definitionJSONText)
        {
            VMCollection collectionDefinition = JsonUtility.FromJson<VMCollection>(definitionJSONText);
            AddCollectionToFactory(collectionDefinition);
        }

        public void Reset() => _collections?.Clear();

        public void AddCollectionsToFactory(List<VMCollection> collections)
        {
            foreach (VMCollection collection in collections)
                AddCollectionToFactory(collection);
        }

        public void AddCollectionToFactory(VMCollection collection)
        {
            if (Collections.ContainsKey(collection.Name))
                throw new System.ArgumentException($"{collection.Name} is already in the {Name}");

            Collections.Add(collection.Name, collection);
        }

        // public Component AddToGameObject(GameObject gameObject, string name)
        // {
        //     if (!Collections.ContainsKey(name))
        //         throw new ArgumentException($"The key \"{ name }\" does not exists in the current Movement Factory");

        //     return gameObject.AddComponent(Collections[name]);
        // }

        public string GetTypeName(Type type)
        {
            if (string.IsNullOrEmpty(type.Namespace))
                return type.Name;

            return $"{type.Namespace}.{type.Name}";
        }

#if UNITY_EDITOR
        public void SaveCollection(VMCollection collection)
        {
            string jsonText = JsonUtility.ToJson(collection, true);
            string path = $"Assets/Resources/{ResourceDirectoryToCollections}{collection.Name}.json";
            System.IO.File.WriteAllText(path, jsonText);
        }
#endif
    }
}