using System;
using UnityEngine;
using UnityEngine.UI;

namespace SpellBoundAR.Items.Selections.UI
{
    [DisallowMultipleComponent]
    [RequireComponent(typeof(Button))]
    public class ItemTypeSelectionButton : MonoBehaviour
    {
        public event Action OnMenuChanged;
        public event Action OnItemTypeChanged;
        public event Action OnIsSelectedChanged;

        [Header("Cache")]
        private Button _button;
        private ItemTypeSelectionMenu _menu;
        private ScriptedItemTypeData _scriptedItemTypeData;
        private bool _isSelected;

        private ItemTypeSelectionMenu Menu
        {
            get => _menu;
            set
            {
                if (_menu == value) return;
                if (_menu) _menu.OnSelectionChanged -= RefreshIsSelected;
                _menu = value;
                if (_menu) _menu.OnSelectionChanged += RefreshIsSelected;
                OnMenuChanged?.Invoke();
                RefreshIsSelected();
            }
        }
        
        public ScriptedItemTypeData ScriptedItemTypeData
        {
            get => _scriptedItemTypeData;
            private set
            {
                if (_scriptedItemTypeData == value) return;
                _scriptedItemTypeData = value;
                OnItemTypeChanged?.Invoke();
                RefreshIsSelected();
            }
        }

        public bool IsSelected
        {
            get => _isSelected;
            private set
            {
                if (_isSelected == value) return;
                _isSelected = value;
                OnIsSelectedChanged?.Invoke();
            }
        }

        private void Awake()
        {
            _button = GetComponent<Button>();
        }

        private void OnEnable()
        {
            if (_button) _button.onClick.AddListener(OnClick);
        }

        private void OnDisable()
        {
            if (_button) _button.onClick.RemoveListener(OnClick);
        }

        private void OnClick()
        {
            if (Menu) Menu.CurrentSelection = ScriptedItemTypeData;
        }

        public void Initialize(ItemTypeSelectionMenu menu, ScriptedItemTypeData scriptedItemTypeData)
        {
            Menu = menu;
            ScriptedItemTypeData = scriptedItemTypeData;
            RefreshIsSelected();
        }

        private void RefreshIsSelected()
        {
            IsSelected = Menu
                          && ScriptedItemTypeData
                          && (ScriptedItemTypeData) _menu.CurrentSelection == ScriptedItemTypeData;
        }
    }
}