using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

namespace SpellBoundAR.Items.Inventories.UI
{
    [DisallowMultipleComponent]
    [RequireComponent(typeof(Text))]
    public class InventoryEntryDisplayQuantityText : MonoBehaviour
    {
        [SerializeField] private string prefix = string.Empty;
        [SerializeField] private int minimumQuantityToAppear = 2;
        [SerializeField] private List<Graphic> controlledGraphics;
        
        [Header("Cache")]
        private Text _text;
        private InventoryEntryDisplay _display;
        private IInventoryEntry _entry;

        private IInventoryEntry Entry
        {
            get => _entry;
            set
            {
                if (_entry == value) return;
                if (_entry != null) _entry.OnQuantityChanged -= RefreshText;
                _entry = value;
                if (_entry != null && isActiveAndEnabled) _entry.OnQuantityChanged += RefreshText;
                RefreshText();
            }
        }

        private void Awake()
        {
            _text = GetComponent<Text>();
            _display = GetComponentInParent<InventoryEntryDisplay>();
        }

        private void OnEnable()
        {
            if (_display) _display.OnEntryChanged += RefreshEntry;
            RefreshEntry();
            RefreshText();
        }

        private void OnDisable()
        {
            if (_display) _display.OnEntryChanged -= RefreshEntry;
            Entry = null;
        }

        private void RefreshEntry()
        {
            Entry = _display ? _display.Entry : null;
        }

        private void RefreshText()
        {
            if (!_text) return;
            int quantity = Entry?.Quantity ?? 0;
            bool shouldEnable = quantity >= minimumQuantityToAppear;
            if (_text)
            {
                _text.text = prefix + quantity;
                _text.enabled = shouldEnable;
            }
            foreach (Graphic graphic in controlledGraphics)
            {
                if (graphic) graphic.enabled = shouldEnable;
            }
        }

#if UNITY_EDITOR

        private void OnValidate()
        {
            if (minimumQuantityToAppear < 0) minimumQuantityToAppear = 0;
        }

#endif
        
    }
}