using System;
using UnityEngine;
using UnityEngine.UI;

namespace AlicizaX.UI.Runtime
{
    public abstract class UIWidget : UIBase
    {
        private UIBase _parent;
        internal UIBase Parent => _parent;


        internal void BindUIHolder(GameObject obj, UIBase parent)
        {
            if (_state != UIState.CreatedUI)
                throw new InvalidOperationException("UI already Created");

            var holder = (UIHolderObjectBase)obj.GetComponent(UIHolderType);

            if (holder == null)
            {
                throw new InvalidCastException($"资源{obj.name}上不存在{UIHolderType.FullName}");
            }

            Holder = holder;
            _parent = parent;
            _canvas = Holder.transform.GetComponent<Canvas>();
            _raycaster = Holder.transform.GetComponent<GraphicRaycaster>();
            Depth = parent.Depth + 5;
            _state = UIState.Loaded;
        }


        public void Open()
        {
            InternalOpen();
        }

        public void Close()
        {
            InternalClose();
        }

        public void Destroy()
        {
            Parent.RemoveWidget(this);
        }
    }

    public abstract class UIWidget<T> : UIWidget where T : UIHolderObjectBase
    {
        protected T baseui => (T)Holder;
        internal override Type UIHolderType => typeof(T);
    }
}