using System;
using System.Collections.Generic;
using System.Linq;
using IronMountain.ResourceUtilities;
using UnityEngine;
using UnityEngine.Localization;

namespace SpellBoundAR.Items
{
    [CreateAssetMenu(menuName = "Scriptable Objects/Gameplay/Items/Item Type Data")]
    public class ScriptedItemTypeData : ScriptableObject, IItemTypeData
    {
        [SerializeField] private string id;
        [SerializeField] private string defaultName;
        [SerializeField] private LocalizedString localizedName;
        [SerializeField] private ResourceSprite depiction;
        [SerializeField] private LocalizedString description;
        [SerializeField] private bool showInInventory = true;
        [SerializeField] private List<ScriptedItemInstanceData> instances = new ();
        [SerializeField] private ResourceGameObject instancePrefab;

        public string ID
        {
            get => id;
            set => id = value;
        }

        public virtual string Name => name;
        
        public string LocalizedName
        {
            get
            {
                if (Application.isPlaying)
                {
                    return localizedName.IsEmpty ? defaultName : localizedName.GetLocalizedString();
                }
#if UNITY_EDITOR
                if (localizedName.IsEmpty || string.IsNullOrEmpty(localizedName.TableReference)) return defaultName;
                var collection = UnityEditor.Localization.LocalizationEditorSettings.GetStringTableCollection(localizedName.TableReference);
                var entry = collection.SharedData.GetEntryFromReference(localizedName.TableEntryReference);
                return entry != null ? entry.Key : defaultName;
#else
				return string.Empty;
#endif
            }
        }

        public Sprite Depiction => depiction ? depiction.Asset : null;
        public string Description => description.IsEmpty ? string.Empty : description.GetLocalizedString();
        public bool ShowInInventory => showInInventory;
        public List<ScriptedItemInstanceData> ScriptedInstances => instances;
        public List<IItemInstanceData> Instances => new (instances);

        public object InstantiateAnInstance<T>(Transform parent = null) where T : IItem
        {
            if (!instancePrefab) return null;
            GameObject gameObject = instancePrefab.Asset;
            if (!gameObject) return null;
            gameObject = Instantiate(gameObject, parent);
            T item = gameObject.GetComponent<T>();
            if (item != null) item.Type = this;
            return item != null ? item : gameObject;
        }
        
        protected virtual void OnEnable() => ItemsManager.Types.Add(this);
        protected virtual void OnDisable() => ItemsManager.Types.Remove(this);
        
#if UNITY_EDITOR

        public void Reset()
        {
            GenerateNewID();
            RefreshInstances();
        }

        public virtual void OnValidate()
        {
            RefreshInstances();
        }

        [ContextMenu("Generate New ID")]
        public void GenerateNewID()
        {
            id = Guid.NewGuid().ToString();
        }

        [ContextMenu("Refresh Instances")]
        private void RefreshInstances()
        {
            instances = instances.Distinct().ToList();
            instances.RemoveAll(instance => !instance || (ScriptedItemTypeData) instance.Type != this);
            foreach (IItemInstanceData instance in ItemsManager.Instances)
            {
                if (instance is not ScriptedItemInstanceData scriptedItemInstanceData) continue;
                if ((ScriptedItemTypeData) scriptedItemInstanceData.Type != this) continue;
                if (instances.Contains(scriptedItemInstanceData)) continue;
                if (instances.Find(test => test.ID == scriptedItemInstanceData.ID)) continue;
                instances.Add(scriptedItemInstanceData);
            }
        }

        public virtual bool HasErrors()
        {
            return localizedName.IsEmpty 
                || description.IsEmpty
                || !depiction;
        }

#endif
        
    }
}