using System;
using System.Threading;
using Cysharp.Threading.Tasks;
using UnityEngine;

namespace AlicizaX.UI.Runtime
{
    [DisallowMultipleComponent]
    public abstract class UIHolderObjectBase : UnityEngine.MonoBehaviour
    {
        public Action OnWindowInitEvent;
        public Action OnWindowBeforeShowEvent;
        public Action OnWindowAfterShowEvent;
        public Action OnWindowBeforeClosedEvent;
        public Action OnWindowAfterClosedEvent;
        public Action OnWindowDestroyEvent;

        private GameObject _target;
        private IUITransitionPlayer _transitionPlayer;

        /// <summary>
        /// UI实例资源对象。
        /// </summary>
        public GameObject Target => _target ??= gameObject;

        private RectTransform _rectTransform;

        /// <summary>
        /// 窗口矩阵位置组件。
        /// </summary>
        public RectTransform RectTransform => _rectTransform ??= _target.transform as RectTransform;

        /// <summary>
        /// 可见性
        /// </summary>
        public bool Visible
        {
            get => Target.activeSelf;

            internal set { _target.SetActive(value); }
        }


        public virtual void Awake()
        {
            _target = gameObject;
        }

        private bool _isAlive = true;

        public bool IsValid()
        {
            return this != null && _isAlive;
        }

        internal UniTask PlayOpenTransitionAsync(CancellationToken cancellationToken = default)
        {
            return TryGetTransitionPlayer(out var transitionPlayer)
                ? transitionPlayer.PlayOpenAsync(cancellationToken)
                : UniTask.CompletedTask;
        }

        internal UniTask PlayCloseTransitionAsync(CancellationToken cancellationToken = default)
        {
            return TryGetTransitionPlayer(out var transitionPlayer)
                ? transitionPlayer.PlayCloseAsync(cancellationToken)
                : UniTask.CompletedTask;
        }

        internal void StopTransition()
        {
            if (TryGetTransitionPlayer(out var transitionPlayer))
            {
                transitionPlayer.Stop();
            }
        }

        private bool TryGetTransitionPlayer(out IUITransitionPlayer transitionPlayer)
        {
            if (_transitionPlayer is Behaviour cachedBehaviour && cachedBehaviour.isActiveAndEnabled)
            {
                transitionPlayer = _transitionPlayer;
                return true;
            }

            _transitionPlayer = null;
            int bestPriority = int.MinValue;
            MonoBehaviour[] behaviours = GetComponents<MonoBehaviour>();
            for (int i = 0; i < behaviours.Length; i++)
            {
                MonoBehaviour behaviour = behaviours[i];
                if (behaviours.IsNull() || !behaviour.isActiveAndEnabled || behaviour is not IUITransitionPlayer player)
                {
                    continue;
                }

                if (player.Priority > bestPriority)
                {
                    _transitionPlayer = player;
                    bestPriority = player.Priority;
                }
            }

            transitionPlayer = _transitionPlayer;
            return transitionPlayer != null;
        }

        private void OnDestroy()
        {
            _isAlive = false;
            _transitionPlayer = null;
        }
    }
}