using UnityEngine;
using UnityEngine.UI;
using TMPro;
using Unity.Netcode;
using System.Collections.Generic;

public class QuickslotUI : MonoBehaviour
{
    [Header("Dynamic Setup")]
    [SerializeField] private GameObject slotPrefab;   // 생성할 슬롯 프리팹
    [SerializeField] private Transform slotContainer; // 슬롯들이 들어갈 부모 (HotbarPanel)

    [Header("Weight UI")]
    [SerializeField] private Slider weightSlider;
    [SerializeField] private TextMeshProUGUI weightText;

    private List<InventorySlotUI> _uiSlots = new List<InventorySlotUI>();
    private PlayerInventory _linkedInventory;

    public void BindInventory(PlayerInventory inventory)
    {
        _linkedInventory = inventory;

        // 1. 기존에 있던 슬롯 UI들 모두 삭제 (초기화)
        foreach (Transform child in slotContainer) Destroy(child.gameObject);
        _uiSlots.Clear();

        // 2. 인벤토리 데이터 크기(slotCount)만큼 UI 프리팹 생성
        for (int i = 0; i < _linkedInventory.slotCount; i++)
        {
            GameObject newSlot = Instantiate(slotPrefab, slotContainer);
            InventorySlotUI slotUI = newSlot.GetComponent<InventorySlotUI>();
            _uiSlots.Add(slotUI);
        }

        // 3. 이벤트 등록 및 초기 갱신
        _linkedInventory.Slots.OnListChanged += (e) => RefreshAll();
        RefreshAll();
    }

    private void RefreshAll()
    {
        if (_linkedInventory == null) return;

        for (int i = 0; i < _uiSlots.Count; i++)
        {
            var data = _linkedInventory.Slots[i];
            _uiSlots[i].UpdateView(data.ItemID, data.Amount);
        }
        UpdateWeightDisplay();
    }

    // 데이터 변경 이벤트 핸들러
    private void OnInventoryDataChanged(NetworkListEvent<PlayerInventory.InventorySlot> changeEvent)
    {
        RefreshAll();
    }

    private void UpdateWeightDisplay()
    {
        if (_linkedInventory == null) return;

        float current = _linkedInventory.CurrentWeight;
        float max = _linkedInventory.maxWeight;

        if (weightSlider != null) weightSlider.value = current / max;
        if (weightText != null) weightText.text = $"{current:F1} / {max:F1} kg";
    }

    private void OnDestroy()
    {
        // 이벤트 구독 해제 (메모리 누수 방지)
        if (_linkedInventory != null)
            _linkedInventory.Slots.OnListChanged -= OnInventoryDataChanged;
    }
}