using System;
using AlicizaX.UI.Extension;
using UnityEngine;
using UnityEngine.UI;

namespace AlicizaX.UI
{
    /// <summary>
    /// 视图持有者基类，用于缓存和复用列表项视图
    /// </summary>
    public abstract class ViewHolder : MonoBehaviour
    {
        private RectTransform rectTransform;

        /// <summary>
        /// 获取 RectTransform 组件
        /// </summary>
        public RectTransform RectTransform
        {
            get
            {
                if (rectTransform == null)
                {
                    rectTransform = GetComponent<RectTransform>();
                }

                return rectTransform;
            }
            private set { rectTransform = value; }
        }

        /// <summary>
        /// 视图名称，用于区分不同类型的视图
        /// </summary>
        public string Name { get; internal set; }

        /// <summary>
        /// 当前绑定的数据索引
        /// </summary>
        public int Index { get; internal set; }

        /// <summary>
        /// 选中状态
        /// </summary>
        public bool ChoiseState { private set; get; }

        /// <summary>
        /// 获取视图的尺寸
        /// </summary>
        public Vector2 SizeDelta => RectTransform.sizeDelta;

        private IButton _button;

        /// <summary>
        /// 视图首次创建时调用
        /// </summary>
        protected internal virtual void OnStart()
        {
        }

        /// <summary>
        /// 视图被回收到对象池时调用
        /// </summary>
        protected internal virtual void OnRecycled()
        {
        }

        /// <summary>
        /// 绑定视图数据（抽象方法，子类必须实现）
        /// </summary>
        /// <typeparam name="T">数据类型</typeparam>
        /// <param name="data">要绑定的数据</param>
        public abstract void BindViewData<T>(T data);

        /// <summary>
        /// 绑定列表项点击事件
        /// </summary>
        /// <typeparam name="T">数据类型</typeparam>
        /// <param name="data">数据对象</param>
        /// <param name="action">点击回调</param>
        protected internal virtual void BindItemClick<T>(T data, Action<T> action)
        {
            if (_button is null && !TryGetComponent(out _button))
            {
                Log.Warning("找不到Button组件");
                return;
            }

            _button.onClick.RemoveAllListeners();
            _button.onClick.AddListener(() => action?.Invoke(data));
        }

        /// <summary>
        /// 绑定选中状态
        /// </summary>
        /// <param name="state">是否选中</param>
        protected internal void BindChoiceState(bool state)
        {
            if (ChoiseState != state)
            {
                ChoiseState = state;
                OnBindChoiceState(state);
            }
        }

        /// <summary>
        /// 选中状态改变时的回调（可在子类中重写）
        /// </summary>
        /// <param name="state">是否选中</param>
        protected internal virtual void OnBindChoiceState(bool state)
        {
        }
    }
}