using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using BITKit;

namespace Net.Project.B.Inventory
{
    public interface IPlayerEquipmentInventory
    {
        IReadOnlyDictionary<int, IRuntimeItem> Items { get; }
        public event Action<int, IRuntimeItem> OnItemAdded;
        public event Action<int, IRuntimeItem> OnItemUpdated;
        public event Action<int, IRuntimeItem> OnItemConsumed;
        public event Action<int, IRuntimeItem> OnItemRemoved;
        bool AddOrUpdate(int slot, IRuntimeItem item);
        bool Remove(int slot);
        bool Consume(int slot);
    }

    public class PlayerEquipmentInventory : IPlayerEquipmentInventory
    {
        public IReadOnlyDictionary<int, IRuntimeItem> Items => _items;
        private readonly ConcurrentDictionary<int, IRuntimeItem> _items = new();
        public event Action<int, IRuntimeItem> OnItemAdded;
        public event Action<int, IRuntimeItem> OnItemUpdated;
        public event Action<int, IRuntimeItem> OnItemConsumed;
        public event Action<int, IRuntimeItem> OnItemRemoved;

        public virtual bool AddOrUpdate(int slot, IRuntimeItem item)
        {
            if (_items.TryGetValue(slot, out var current))
            {
                if (current.Id != item.Id) return false;

                _items[slot] = item;
                OnItemUpdated?.Invoke(slot, item);
            }
            else
            {
                _items.TryAdd(slot, item);
                OnItemAdded?.Invoke(slot, item);
            }

            return true;
        }

        public virtual bool Remove(int slot)
        {
            if (!_items.TryRemove(slot, out var item)) return false;
            OnItemRemoved?.Invoke(slot, item);
            return true;

        }

        public virtual bool Consume(int slot)
        {
            if (_items.TryRemove(slot, out _) is false) return false;
            OnItemConsumed?.Invoke(slot, null);
            return true;
        }
    }
}