using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.Events;

namespace UIWidgets
{
	[AddComponentMenu("UI/ListViewGameObjects", 255)]
	public class ListViewGameObjects : ListViewBase
	{
		[SerializeField]
		private List<GameObject> objects = new List<GameObject>();

		private List<UnityAction<PointerEventData>> callbacksEnter = new List<UnityAction<PointerEventData>>();

		private List<UnityAction<PointerEventData>> callbacksExit = new List<UnityAction<PointerEventData>>();

		public Func<IEnumerable<GameObject>, IEnumerable<GameObject>> SortFunc;

		public ListViewGameObjectsEvent OnSelectObject = new ListViewGameObjectsEvent();

		public ListViewGameObjectsEvent OnDeselectObject = new ListViewGameObjectsEvent();

		public ListViewGameObjectsEvent OnPointerEnterObject = new ListViewGameObjectsEvent();

		public ListViewGameObjectsEvent OnPointerExitObject = new ListViewGameObjectsEvent();

		[NonSerialized]
		private bool isStartedListViewGameObjects;

		public List<GameObject> Objects
		{
			get
			{
				return new List<GameObject>(objects);
			}
			private set
			{
				UpdateItems(value);
			}
		}

		private void Awake()
		{
			Start();
		}

		public override void Start()
		{
			if (!isStartedListViewGameObjects)
			{
				isStartedListViewGameObjects = true;
				base.Start();
				DestroyGameObjects = true;
				UpdateItems();
				OnSelect.AddListener(OnSelectCallback);
				OnDeselect.AddListener(OnDeselectCallback);
			}
		}

		private void OnSelectCallback(int index, ListViewItem item)
		{
			OnSelectObject.Invoke(index, objects[index]);
		}

		private void OnDeselectCallback(int index, ListViewItem item)
		{
			OnDeselectObject.Invoke(index, objects[index]);
		}

		private void OnPointerEnterCallback(int index)
		{
			OnPointerEnterObject.Invoke(index, objects[index]);
		}

		private void OnPointerExitCallback(int index)
		{
			OnPointerExitObject.Invoke(index, objects[index]);
		}

		public override void UpdateItems()
		{
			UpdateItems(objects);
		}

		public virtual int Add(GameObject item)
		{
			List<GameObject> list = Objects;
			list.Add(item);
			UpdateItems(list);
			return objects.IndexOf(item);
		}

		public virtual int Remove(GameObject item)
		{
			int num = objects.IndexOf(item);
			if (num == -1)
			{
				return num;
			}
			List<GameObject> list = Objects;
			list.Remove(item);
			UpdateItems(list);
			return num;
		}

		private void RemoveCallback(ListViewItem item, int index)
		{
			if (!(item == null))
			{
				if (index < callbacksEnter.Count)
				{
					item.onPointerEnter.RemoveListener(callbacksEnter[index]);
				}
				if (index < callbacksExit.Count)
				{
					item.onPointerExit.RemoveListener(callbacksExit[index]);
				}
			}
		}

		private void RemoveCallbacks()
		{
			base.Items.ForEach(RemoveCallback);
			callbacksEnter.Clear();
			callbacksExit.Clear();
		}

		private void AddCallbacks()
		{
			base.Items.ForEach(AddCallback);
		}

		private void AddCallback(ListViewItem item, int index)
		{
			callbacksEnter.Add(delegate
			{
				OnPointerEnterCallback(index);
			});
			callbacksExit.Add(delegate
			{
				OnPointerExitCallback(index);
			});
			item.onPointerEnter.AddListener(callbacksEnter[index]);
			item.onPointerExit.AddListener(callbacksExit[index]);
		}

		private List<GameObject> SortItems(IEnumerable<GameObject> newItems)
		{
			IEnumerable<GameObject> enumerable = newItems;
			if (SortFunc != null)
			{
				enumerable = SortFunc(enumerable);
			}
			return enumerable.ToList();
		}

		public override void Clear()
		{
			if (DestroyGameObjects)
			{
				objects.ForEach(UnityEngine.Object.Destroy);
			}
			UpdateItems(new List<GameObject>());
		}

		private void UpdateItems(List<GameObject> newItems)
		{
			RemoveCallbacks();
			newItems = SortItems(newItems);
			List<int> second = (from x in base.SelectedIndicies
				select (objects.Count <= x) ? (-1) : newItems.IndexOf(objects[x]) into x
				where x != -1
				select x).ToList();
			base.SelectedIndicies.Except(second).ForEach(base.Deselect);
			objects = newItems;
			base.Items = newItems.Convert((GameObject x) => x.GetComponent<ListViewItem>() ?? x.AddComponent<ListViewItem>());
			base.SelectedIndicies = second;
			AddCallbacks();
		}

		protected override void OnDestroy()
		{
			OnSelect.RemoveListener(OnSelectCallback);
			OnDeselect.RemoveListener(OnDeselectCallback);
			RemoveCallbacks();
			base.OnDestroy();
		}
	}
}