using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

namespace XUI
{
	public class UIPage : LinkedList<UIGroup>
	{

		public void SendBeenCover()
		{
			foreach (var g in this)
			{
				foreach (var item in g)
				{
					item.SendBeenCover();
				}
			}
		}

		public void SendDeCover()
		{
			foreach (var g in this)
			{
				foreach (var item in g)
				{
					item.SendDeCover();
				}
			}
		}
	}


	public class UIGroup : List<UIItem>
	{

		public GameObject gameObject;
		private UIStack Stack;

		public UIGroup(UIStack stack, IEnumerable<GameObject> prefabs)
		{
			this.Stack = stack;
			if (stack.CreateGroupGameObject)
			{
				gameObject = new GameObject("Group", typeof(RectTransform));
				RectTransform transform = (RectTransform)gameObject.transform;
				transform.anchorMin = Vector2.zero;
				transform.anchorMax = Vector2.one;
				transform.pivot = Vector2.one * 0.5f;
				transform.offsetMin = Vector2.zero;
				transform.offsetMax = Vector2.zero;
				gameObject.transform.SetParent(stack.transform, false);
			}

			foreach (var prefab in prefabs)
			{
				Add(stack.PrefabToUIItem(prefab, gameObject));
			}

			stack.OnUIGroupCreated(this);
		}

		public void Spawn()
		{
			foreach (var item in this)
			{
				var ins = Stack.Spawn(item.Prefab);
				item.Instance = ins;
				//				item.InstanceCanvas = ins.GetOrAddComponent<Canvas>();
				//				ins.GetOrAddComponent<GraphicRaycaster>();
				if (gameObject != null)
				{
					ins.transform.SetParent(gameObject.transform);
				}
			}
		}

		public void Despawn(bool destroy)
		{
			foreach (var item in this)
			{
				Stack.Despawn(item.Instance, destroy);
			}
			if (gameObject != null)
			{
				Object.Destroy(gameObject);//TODO 考虑对象池
			}
		}

		public void SendEnterStack(params object[] args)
		{
			foreach (var item in this)
			{
				if (item.Instance == null)
				{
					continue;
				}
				item.SendEnterStack(args);
			}
		}

		public void SendLeaveStack()
		{
			foreach (var item in this)
			{
				if (item.Instance == null)
				{
					continue;
				}
				item.SendLeaveStack();
			}
		}

		public void SendBeenOverlay()
		{
			foreach (var item in this)
			{
				if (item.Instance == null)
				{
					continue;
				}
				item.SendBeenOverlay();
			}
		}

		public void SendDeOverlay()
		{
			foreach (var item in this)
			{
				if (item.Instance == null)
				{
					continue;
				}
				item.SendDeOverlay();
			}
		}

	}

}