using Cysharp.Threading.Tasks;
using Cysharp.Threading.Tasks.Linq;

using PMaker.Extension;

using Sirenix.OdinInspector;

using System.Linq;

using UnityEditor;

using UnityEngine;
using UnityEngine.UI;

public class UIBookEase : BaseBehaviour
{
    [SerializeField]
    private GameObject[] _pages;

    [SerializeField]
    private IndexController _indexController;

    [SerializeField]
    private AsyncReactiveProperty<int> _index;

    public bool isHide = true;

    private void Reset()
    {
        this._pages = this
            .transform
            .Find("root")
            .Children()
            //.Where(_ => _.GetComponent<BaseBehaviour>() == null)
            //.Where(_ => _.GetComponent<Selectable>() == null)
            .Select(_ => _.gameObject)
            .ToArray();
        this._indexController = this.GetComponentInChildren<IndexController>(true);
    }

    private void Start()
    {
        var token = this.GetCancellationTokenOnDestroy();
        _index = new AsyncReactiveProperty<int>(0);
        var max = _pages.Length - 1;
        _index
            .Where(_ => _ >= 0 && _ <= max)
            .Subscribe(_ => {
                if (this.isHide == true)
                {
                    if (_ == 0)
                    {
                        _indexController.SetActive(0, false);
                    }
                    else
                    {
                        _indexController.SetActive(0, true);
                    }
                    if (_ == max)
                    {
                        _indexController.SetActive(1, false);
                    }
                    else
                    {
                        _indexController.SetActive(1, true);
                    }
                }

                foreach (var item in _pages)
                {
                    item.SetActive(false);
                }
                _pages[_].SetActive(true);
            })
            .AddTo(token);
        _indexController.Bind(this._index, 0, max + 1, token);
    }

#if UNITY_EDITOR
    public Sprite[] sprites;

    [Button]
    [ContextMenu("SetValue")]
    private void SetValue()
    {
        var images = this.transform.Find("root").Children().Select(_ => _.GetComponent<Image>()).ToArray();

        for (int i = 0; i < sprites.Length; i++)
        {
            images[i].sprite = sprites[i];
            images[i].SetDirty();
        }
        this._pages = images.Select(_ => _.gameObject).ToArray();
    }
#endif
}