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

namespace UIWidgets
{
	public abstract class ListViewBase : MonoBehaviour, ISelectHandler, IDeselectHandler, ISubmitHandler, ICancelHandler, IEventSystemHandler
	{
		[SerializeField]
		[HideInInspector]
		private List<ListViewItem> items = new List<ListViewItem>();

		private List<UnityAction> callbacks = new List<UnityAction>();

		[SerializeField]
		[HideInInspector]
		public bool DestroyGameObjects = true;

		[SerializeField]
		public bool Multiple;

		[SerializeField]
		private int selectedIndex = -1;

		[SerializeField]
		private List<int> selectedIndicies = new List<int>();

		public ListViewBaseEvent OnSelect = new ListViewBaseEvent();

		public ListViewBaseEvent OnDeselect = new ListViewBaseEvent();

		public UnityEvent onSubmit = new UnityEvent();

		public UnityEvent onCancel = new UnityEvent();

		public UnityEvent onItemSelect = new UnityEvent();

		public UnityEvent onItemCancel = new UnityEvent();

		[SerializeField]
		public Transform Container;

		public ListViewFocusEvent OnFocusIn = new ListViewFocusEvent();

		public ListViewFocusEvent OnFocusOut = new ListViewFocusEvent();

		[NonSerialized]
		protected bool SetItemIndicies = true;

		private GameObject Unused;

		[NonSerialized]
		private bool isStartedListViewBase;

		public List<ListViewItem> Items
		{
			get
			{
				return new List<ListViewItem>(items);
			}
			set
			{
				UpdateItems(value);
			}
		}

		public int SelectedIndex
		{
			get
			{
				return selectedIndex;
			}
			set
			{
				if (value == -1)
				{
					if (selectedIndex != -1)
					{
						Deselect(selectedIndex);
					}
					selectedIndex = value;
				}
				else
				{
					Select(value);
				}
			}
		}

		public List<int> SelectedIndicies
		{
			get
			{
				return new List<int>(selectedIndicies);
			}
			set
			{
				IEnumerable<int> enumerable = selectedIndicies.Except(value);
				IEnumerable<int> enumerable2 = value.Except(selectedIndicies);
				enumerable.ForEach(Deselect);
				enumerable2.ForEach(Select);
			}
		}

		private void Awake()
		{
			Start();
		}

		public virtual void Start()
		{
			if (!isStartedListViewBase)
			{
				isStartedListViewBase = true;
				Unused = new GameObject("unused base");
				Unused.SetActive(false);
				Unused.transform.SetParent(base.transform, false);
				if (selectedIndex != -1 && selectedIndicies.Count == 0)
				{
					selectedIndicies.Add(selectedIndex);
				}
				selectedIndicies.RemoveAll(NotIsValid);
				if (selectedIndicies.Count == 0)
				{
					selectedIndex = -1;
				}
			}
		}

		protected bool NotIsValid(int index)
		{
			return !IsValid(index);
		}

		public virtual void UpdateItems()
		{
			UpdateItems(items);
		}

		private void RemoveCallback(ListViewItem item, int index)
		{
			if (!(item == null))
			{
				if (index < callbacks.Count)
				{
					item.onClick.RemoveListener(callbacks[index]);
				}
				item.onSubmit.RemoveListener(Toggle);
				item.onCancel.RemoveListener(OnItemCancel);
				item.onSelect.RemoveListener(HighlightColoring);
				item.onDeselect.RemoveListener(Coloring);
				item.onMove.RemoveListener(OnItemMove);
			}
		}

		private void OnItemCancel(ListViewItem item)
		{
			if (!EventSystem.current.alreadySelecting)
			{
				EventSystem.current.SetSelectedGameObject(base.gameObject);
				onItemCancel.Invoke();
			}
		}

		private void RemoveCallbacks()
		{
			if (callbacks.Count > 0)
			{
				items.ForEach(RemoveCallback);
			}
			callbacks.Clear();
		}

		private void AddCallbacks()
		{
			items.ForEach(AddCallback);
		}

		private void AddCallback(ListViewItem item, int index)
		{
			callbacks.Insert(index, delegate
			{
				Toggle(item);
			});
			item.onClick.AddListener(callbacks[index]);
			item.onSubmit.AddListener(OnItemSubmit);
			item.onCancel.AddListener(OnItemCancel);
			item.onSelect.AddListener(HighlightColoring);
			item.onDeselect.AddListener(Coloring);
			item.onMove.AddListener(OnItemMove);
		}

		private void OnItemSelect(ListViewItem item)
		{
			onItemSelect.Invoke();
		}

		private void OnItemSubmit(ListViewItem item)
		{
			Toggle(item);
			if (!IsSelected(item.Index))
			{
				HighlightColoring(item);
			}
		}

		protected virtual void OnItemMove(AxisEventData eventData, ListViewItem item)
		{
			switch (eventData.moveDir)
			{
			case MoveDirection.Left:
				break;
			case MoveDirection.Right:
				break;
			case MoveDirection.Up:
				if (item.Index > 0)
				{
					SelectComponentByIndex(item.Index - 1);
				}
				break;
			case MoveDirection.Down:
				if (IsValid(item.Index + 1))
				{
					SelectComponentByIndex(item.Index + 1);
				}
				break;
			}
		}

		protected virtual void ScrollTo(int index)
		{
		}

		public virtual int Add(ListViewItem item)
		{
			item.transform.SetParent(Container, false);
			AddCallback(item, items.Count);
			items.Add(item);
			item.Index = callbacks.Count - 1;
			return callbacks.Count - 1;
		}

		public virtual void Clear()
		{
			items.Clear();
			UpdateItems();
		}

		protected virtual int Remove(ListViewItem item)
		{
			RemoveCallbacks();
			int index = item.Index;
			selectedIndicies = (from x in selectedIndicies
				where x != index
				select (x <= index) ? x : x--).ToList();
			if (selectedIndex == index)
			{
				Deselect(index);
				selectedIndex = ((selectedIndicies.Count <= 0) ? (-1) : selectedIndicies.Last());
			}
			else if (selectedIndex > index)
			{
				selectedIndex--;
			}
			items.Remove(item);
			Free(item);
			AddCallbacks();
			return index;
		}

		private void Free(Component item)
		{
			if (item == null)
			{
				return;
			}
			if (DestroyGameObjects)
			{
				if (!(item.gameObject == null))
				{
					UnityEngine.Object.Destroy(item.gameObject);
				}
			}
			else if (!(item.transform == null) && !(Unused == null) && !(Unused.transform == null))
			{
				item.transform.SetParent(Unused.transform, false);
			}
		}

		private void UpdateItems(List<ListViewItem> newItems)
		{
			RemoveCallbacks();
			items.Where((ListViewItem item) => item != null && !newItems.Contains(item)).ForEach(Free);
			newItems.ForEach(UpdateItem);
			items = newItems;
			AddCallbacks();
		}

		private void UpdateItem(ListViewItem item, int index)
		{
			if (!(item == null))
			{
				if (SetItemIndicies)
				{
					item.Index = index;
				}
				item.transform.SetParent(Container, false);
			}
		}

		public virtual bool IsValid(int index)
		{
			return index >= 0 && index < items.Count;
		}

		protected ListViewItem GetItem(int index)
		{
			return items.Find((ListViewItem x) => x.Index == index);
		}

		public virtual void Select(int index)
		{
			if (index == -1)
			{
				return;
			}
			if (!IsValid(index))
			{
				string message = string.Format("Index must be between 0 and Items.Count ({0}). Gameobject {1}.", items.Count - 1, base.name);
				throw new IndexOutOfRangeException(message);
			}
			if (IsSelected(index) && Multiple)
			{
				return;
			}
			if (!Multiple)
			{
				if (selectedIndex != -1 && selectedIndex != index)
				{
					Deselect(selectedIndex);
				}
				selectedIndicies.Clear();
			}
			selectedIndicies.Add(index);
			selectedIndex = index;
			SelectItem(index);
			OnSelect.Invoke(index, GetItem(index));
		}

		protected void SilentDeselect(List<int> indicies)
		{
			selectedIndicies = selectedIndicies.Except(indicies).ToList();
			selectedIndex = ((selectedIndicies.Count <= 0) ? (-1) : selectedIndicies[selectedIndicies.Count - 1]);
		}

		protected void SilentSelect(List<int> indicies)
		{
			if (indicies == null)
			{
				indicies = new List<int>();
			}
			selectedIndicies.AddRange(indicies.Except(selectedIndicies));
			selectedIndex = ((selectedIndicies.Count <= 0) ? (-1) : selectedIndicies[selectedIndicies.Count - 1]);
		}

		public void Deselect(int index)
		{
			if (index != -1 && IsSelected(index))
			{
				selectedIndicies.Remove(index);
				selectedIndex = ((selectedIndicies.Count <= 0) ? (-1) : selectedIndicies.Last());
				if (IsValid(index))
				{
					DeselectItem(index);
					OnDeselect.Invoke(index, GetItem(index));
				}
			}
		}

		public bool IsSelected(int index)
		{
			return selectedIndicies.Contains(index);
		}

		public void Toggle(int index)
		{
			if (IsSelected(index) && Multiple)
			{
				Deselect(index);
			}
			else
			{
				Select(index);
			}
		}

		private void Toggle(ListViewItem item)
		{
			bool flag = Input.GetKey(KeyCode.LeftShift) || Input.GetKey(KeyCode.RightShift);
			bool flag2 = selectedIndicies.Count > 0;
			if (Multiple && flag && flag2 && selectedIndicies[0] != item.Index)
			{
				selectedIndicies.GetRange(1, selectedIndicies.Count - 1).ForEach(Deselect);
				int num = Mathf.Min(selectedIndicies[0], item.Index);
				int num2 = Mathf.Max(selectedIndicies[0], item.Index);
				Enumerable.Range(num, num2 - num + 1).ForEach(Select);
			}
			else
			{
				Toggle(item.Index);
			}
		}

		protected int GetComponentIndex(ListViewItem item)
		{
			return item.Index;
		}

		protected void SetComponentAsLastSibling(ListViewItem item)
		{
			item.transform.SetAsLastSibling();
		}

		protected virtual void SelectItem(int index)
		{
		}

		protected virtual void DeselectItem(int index)
		{
		}

		protected virtual void Coloring(ListViewItem component)
		{
		}

		protected virtual void HighlightColoring(ListViewItem component)
		{
		}

		protected virtual void OnDestroy()
		{
			RemoveCallbacks();
			items.ForEach(Free);
		}

		public virtual bool SelectComponent()
		{
			if (items.Count == 0)
			{
				return false;
			}
			int index = ((SelectedIndex != -1) ? SelectedIndex : 0);
			SelectComponentByIndex(index);
			return true;
		}

		protected void SelectComponentByIndex(int index)
		{
			ScrollTo(index);
			ListViewItemEventData listViewItemEventData = new ListViewItemEventData(EventSystem.current);
			listViewItemEventData.NewSelectedObject = GetItem(index).gameObject;
			ListViewItemEventData listViewItemEventData2 = listViewItemEventData;
			ExecuteEvents.Execute(listViewItemEventData2.NewSelectedObject, listViewItemEventData2, ExecuteEvents.selectHandler);
		}

		void ISelectHandler.OnSelect(BaseEventData eventData)
		{
			if (!EventSystem.current.alreadySelecting)
			{
				EventSystem.current.SetSelectedGameObject(base.gameObject);
			}
			OnFocusIn.Invoke(eventData);
		}

		void IDeselectHandler.OnDeselect(BaseEventData eventData)
		{
			OnFocusOut.Invoke(eventData);
		}

		void ISubmitHandler.OnSubmit(BaseEventData eventData)
		{
			SelectComponent();
			onSubmit.Invoke();
		}

		void ICancelHandler.OnCancel(BaseEventData eventData)
		{
			onCancel.Invoke();
		}

		public virtual void ForEachComponent(Action<ListViewItem> func)
		{
			items.ForEach(func);
		}
	}
}