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

public class itemGetPrefab : MonoBehaviour
{
    [Header("item prefab")]
    public GameObject itemPrefab;
    public Transform displayParent;

    [Header("rarity")]
    public ItemRarityColorConfigSO rarityColorConfig;

    [Header("btn")]
    public Button close;

    private readonly List<GameObject> spawnedItems = new List<GameObject>();
    private Coroutine layoutRefreshRoutine;

    private void Awake()
    {
        if (close != null)
        {
            close.onClick.RemoveListener(CloseSelf);
            close.onClick.AddListener(CloseSelf);
        }
    }

    private void OnDestroy()
    {
        if (close != null)
        {
            close.onClick.RemoveListener(CloseSelf);
        }
    }

    public void ClearItems()
    {
        for (int i = 0; i < spawnedItems.Count; i++)
        {
            if (spawnedItems[i] != null)
            {
                Destroy(spawnedItems[i]);
            }
        }

        spawnedItems.Clear();

        if (displayParent != null)
        {
            for (int i = displayParent.childCount - 1; i >= 0; i--)
            {
                Destroy(displayParent.GetChild(i).gameObject);
            }
        }

        RequestLayoutRebuild();
    }

    public get_item_prefab AddItem()
    {
        if (itemPrefab == null || displayParent == null)
        {
            return null;
        }

        GameObject instance = Instantiate(itemPrefab, displayParent);
        spawnedItems.Add(instance);
        UI_OrderedEntryAnimator.PlayFadeOnly(instance, spawnedItems.Count - 1, 0.2f, 0.025f, true);
        RequestLayoutRebuild();
        return instance.GetComponent<get_item_prefab>();
    }

    private void RequestLayoutRebuild()
    {
        if (displayParent == null)
        {
            return;
        }

        if (layoutRefreshRoutine != null)
        {
            StopCoroutine(layoutRefreshRoutine);
            layoutRefreshRoutine = null;
        }

        if (isActiveAndEnabled)
        {
            layoutRefreshRoutine = StartCoroutine(RebuildLayoutNextFrame());
            return;
        }

        RebuildLayoutNow();
    }

    private System.Collections.IEnumerator RebuildLayoutNextFrame()
    {
        yield return null;
        RebuildLayoutNow();
        layoutRefreshRoutine = null;
    }

    private void RebuildLayoutNow()
    {
        RectTransform rect = displayParent as RectTransform;
        if (rect == null)
        {
            return;
        }

        Canvas.ForceUpdateCanvases();
        LayoutRebuilder.ForceRebuildLayoutImmediate(rect);
        Canvas.ForceUpdateCanvases();
    }

    public void CloseSelf()
    {
        UI_PanelExitUtility.PlayExitThen(gameObject, () =>
        {
            if (gameObject != null)
            {
                Destroy(gameObject);
            }
        });
    }
}