#if ADDRESSABLES && UI_ELEMENTS
using UnityEngine;
using UnityEngine.UIElements;
using UnityEngine.AddressableAssets;
using UnityEngine.ResourceManagement.AsyncOperations;
using System;
using System.Collections;
using System.ComponentModel;

public class MultiSelectChips : VisualElement
{
    public string LabelText
    {
        get => label.text;
        set
        {
            if (!string.IsNullOrEmpty(value))
            {
                if (label == null)
                {
                    InitLabel();
                }

                label.text = value;
            }
            else if (label != null)
            {
                label.RemoveFromHierarchy();
                label = null;
            }
        }
    }

    public IList ItemsSource
    {
        get => itemsSource;

        set
        {
            itemsSource = value;
            UpdateItems();
        }      
    }

    private Label label;
    private AsyncOperationHandle<VisualTreeAsset> uxmlHandle, itemUxmlHandle;

    private VisualTreeAsset itemPrefab;

    private IList itemsSource;

    public new class UxmlFactory : UxmlFactory<MultiSelectChips, UxmlTraits>
    {

    }

    public new class UxmlTraits : VisualElement.UxmlTraits
    {
        private readonly UxmlStringAttributeDescription label;

        public UxmlTraits()
        {
            label = new()
            {
                name = "label"
            };
        }

        public override void Init(VisualElement ve, IUxmlAttributes bag, CreationContext cc)
        {
            base.Init(ve, bag, cc);
            ((MultiSelectChips)ve).LabelText = label.GetValueFromBag(bag, cc);
        }
    }

    public MultiSelectChips() : base()
    {
        uxmlHandle = Addressables.LoadAssetAsync<VisualTreeAsset>("NegUiToolkits/MultiSelectChips.uxml");
        itemUxmlHandle = Addressables.LoadAssetAsync<VisualTreeAsset>("NegUiToolkits/MultiSelectChipsItem.uxml");
        uxmlHandle.Completed += OnUxmlLoaded;
        itemUxmlHandle.Completed += OnItemUxmlLoaded;
    }

    public void UpdateItems()
    {
        if (itemPrefab == null)
            return;
    }

    private void InitLabel()
    {
        label = new Label()
        {
            pickingMode = PickingMode.Ignore
        };
        Add(label);
    }

    private void OnUxmlLoaded(AsyncOperationHandle<VisualTreeAsset> operation)
    {
        if (operation.Status == AsyncOperationStatus.Succeeded)
        {
            Add(operation.Result.Instantiate());
            Addressables.Release(uxmlHandle);
        }
        else
        {
            Debug.LogError($"Asset failed to load.");
        }
    }

    private void OnItemUxmlLoaded(AsyncOperationHandle<VisualTreeAsset> operation)
    {

        if (operation.Status == AsyncOperationStatus.Succeeded)
        {
            itemPrefab = operation.Result;
            Addressables.Release(itemUxmlHandle);
            UpdateItems();
        }
        else
        {
            Debug.LogError($"Asset failed to load.");
        }
    }
}
#endif