using System;
using System.Collections.Generic;
using RPGCore.BackpackEquipment.Data;
using RPGCore.BackpackEquipment.ObjectModules.Content.Events;
using RPGCore.BackpackEquipment.Objects;
using RPGCore.Core;
using RPGCore.Core.Objects;
using RPGCore.ObjectModules.EventObjectModule.Events;
using UnityEngine;

namespace RPGCore.BackpackEquipment.ObjectModules.Content
{
    [Serializable]
    [RequireComponent(typeof(BaseObject))]
    public sealed class ContentModule : ObjectModule<BaseObject>
    {
        // TODO: tutaj jakiś domyślny owner?
        
        private Dictionary<ItemObject, IContentOwner> _items = new();

        public bool Add(ItemObject item)
        {
            if (item.data.Get<ItemObjectData>().carriedBy) return false;
            if (_items.ContainsKey(item)) return false;
            
            _items.TryAdd(item, null);
            item.data.Get<ItemObjectData>().carriedBy = parent;
            parent.events.Invoke(new ContentAddEvent{obj = parent, item = item});
            item.events.Register<RemoveEvent>(OnItemRemove);

            return true;
        }

        public bool Remove(ItemObject item)
        {
            if (!_items.ContainsKey(item)) return false;
            
            _items[item]?.Remove_Internal(item);
            _items.Remove(item);
            item.data.Get<ItemObjectData>().carriedBy = null;
            parent.events.Invoke(new ContentAddEvent{obj = parent, item = item});
            item.events.Unregister<RemoveEvent>(OnItemRemove);

            return true;
        }

        public bool TransferTo(IContentOwner newOwner, ItemObject item, int index = -1)
        {
            if (parent.data.Get<ItemObjectData>().carriedBy != parent) return false;

            if (!newOwner.CanAdd(item, index)) return false;
            
            _items.TryAdd(item, null);
            _items[item]?.Remove_Internal(item);
            _items[item] = newOwner;
            newOwner.Add_Internal(item, index);

            return true;
        }

        private void OnItemRemove(RemoveEvent removeEvent)
        {
            Remove(removeEvent.obj as  ItemObject);
        }
    }
}