using System;
using UnityEngine;

namespace SpellBoundAR.Items.Selections.UI
{
    public class ItemTypeSelectionMenu : MonoBehaviour
    {
        public event Action OnSelectionChanged;
        public event Action<IItemTypeData> OnSelectionChangedTo;

        private IItemTypeData _currentSelection;

        public IItemTypeData PreviousSelection { get; private set; }

        public IItemTypeData CurrentSelection
        {
            get => _currentSelection;
            set
            {
                if (_currentSelection == value) return;
                PreviousSelection = _currentSelection;
                _currentSelection = value;
                OnSelectionChanged?.Invoke();
                OnSelectionChangedTo?.Invoke(_currentSelection);
            }
        }
        
        [SerializeField] private ScriptedItemTypeDataList items;
        [SerializeField] private ItemTypeSelectionButton prefab;
        [SerializeField] private Transform parent;

        public ScriptedItemTypeDataList Items
        {
            get => items;
            set
            {
                items = value;
                Refresh();
            }
        }

        private void OnEnable() => Refresh();

        private void Refresh()
        {
            DestroyAllItems();
            SpawnAllItems();
        }

        private void DestroyAllItems()
        {
            if (!parent) return;
            foreach (Transform child in parent.transform)
            {
                Destroy(child.gameObject);
            }
        }

        private void SpawnAllItems()
        {
            if (!items) return;
            foreach (ScriptedItemTypeData scriptedItemTypeData in items.ItemTypes)
            {
                if (!scriptedItemTypeData) continue;
                Instantiate(prefab, parent.transform).Initialize(this, scriptedItemTypeData);
            }
        }
    }
}