using System.Collections.Generic;
using Managers;
using UnityEngine;

// InventoryUI.cs

public class InventoryUIController : MonoBehaviour
{
    public Transform itemParent;

    private readonly Dictionary<int, GameObject> _slots = new();
    public static InventoryUIController Instance { get; private set; }

    private void Awake()
    {
        if (Instance == null)
        {
            Instance = this;
            DontDestroyOnLoad(gameObject);
        }
        else
        {
            Destroy(gameObject);
        }
    }

    private void Start()
    {
        Debug.Log("InventoryUI Start");
        if (itemParent == null) Debug.LogWarning("ItemParent is null! Can not attach");
        UpdateUI();
    }


    public void ListChildren(GameObject parent)
    {
        foreach (Transform child in parent.transform) Debug.Log("Child: " + child.name);
    }

    public void UpdateUI()
    {
        // Clear existing slots
        _slots.Clear();
        // Get values from inventory and redraw the inventory slots based on that.
        // Delete existing children if any.
        foreach (Transform child in itemParent) Destroy(child.gameObject);

        if (InventoryManager.Instance.Slots.Count == 0)
            InventoryManager.Instance.Initialize(PlayerManager.Instance.playerData);

        var slotPrefab = PrefabManager.Instance.GetSlotPrefab();
        var itemPrefab = PrefabManager.Instance.GetItemPrefab();


        foreach (var inventorySlot in InventoryManager.Instance.Slots)
        {
            // Draw slots to screen
            var slotDisplay = Instantiate(slotPrefab, itemParent);
            var i = inventorySlot.Key;

            var inventorySlotComponent = slotDisplay.GetComponent<SlotComponent>();

            // Add prefab to slot
            inventorySlotComponent.SetSlotDetails(inventorySlot.Value);

            _slots.Add(i, slotDisplay);
        }

        Debug.Log("Finished adding items to slots");
    }
}