using System;
using System.Linq;
using RPGCore.BackpackEquipment.ObjectModules.Content;
using RPGCore.BackpackEquipment.ObjectModules.UnitEquipment.Data;
using RPGCore.BackpackEquipment.ObjectModules.UnitEquipment.Events;
using RPGCore.BackpackEquipment.ObjectModules.UnitEquipment.Objects;
using RPGCore.BackpackEquipment.Objects;
using RPGCore.Core;
using RPGCore.Core.Objects;
using UnityEngine;

namespace RPGCore.BackpackEquipment.ObjectModules.UnitEquipment
{
    [RequireComponent(typeof(ContentModule))]
    [DisallowMultipleComponent]
    [ObjectModule(
        name: "[Inventory] Equipment",
        description: "Requires <b>ContentModule</b> to work. Attached to <b>UnitObject</b>. " +
        "Allows to define equipment schema which further allows to equip those wearable items."
    )]
    public class UnitEquipmentModule : ObjectModule<UnitObject>, IContentOwner
    {
        [SerializeField] private EquipmentSchemaSO _schema;
        [SerializeField] private WearableObject[] _serializedItems;
        
        private WearableObject[] _items;

        private void Awake()
        {
            _items = new WearableObject[_schema.slots.Length];
        }

        private void Start()
        {
            InitializeItems();
        }
        
        ////////////////////////////////////////////////////////////////////////////////////////////////////////////////

        private void InitializeItems()
        {
            // TODO: inicjalizacja serializowanych itemkow + ich eventy
        }
        
        ////////////////////////////////////////////////////////////////////////////////////////////////////////////////

        public bool CanAdd(ItemObject item, int index)
        {
            if (item is not WearableObject wearable) return false;
            
            var slot = _schema.slots[index];
            if (slot == null) return false;

            if (!slot.validTypes.Contains(wearable.data.Get<WearableObjectData>().type)) return false;

            return true;
        }

        bool IContentOwner.Add(ItemObject item, int index)
        {
            var wearable = (WearableObject)item;
            
            parent.events.Invoke(new EquipmentEquipEvent { unit = parent, wearable = wearable, index = index });
            
            _items[index] = wearable;
            return true;
        }

        bool IContentOwner.Remove(ItemObject item)
        {
            var wearable = (WearableObject)item;
            var index = Array.IndexOf(_items, wearable);
            
            parent.events.Invoke(new EquipmentUnEquipEvent { unit = parent, wearable = wearable, index = index });
            
            _items[index] = null;
            return true;
        }
        
        ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    }
}