using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using UnityEngine;

namespace UIWidgets
{
	[Serializable]
	public class ObservableList<T> : IObservableList<T>, IList<T>, IObservable, ICollectionChanged, ICollectionItemChanged, IDisposable, IEnumerable, ICollection<T>, IEnumerable<T>
	{
		public bool ResortOnCollectionChanged = true;

		public bool ResortOnCollectionItemChanged = true;

		private Comparison<T> comparison;

		[SerializeField]
		protected List<T> Items;

		private bool IsItemsDisposable;

		private bool IsItemsObservable;

		private bool IsItemsSupportNotifyPropertyChanged;

		private bool isCollectionChanged;

		private bool isCollectionItemChanged;

		private bool isChanged;

		private bool inUpdate;

		private bool disposed;

		public Comparison<T> Comparison
		{
			get
			{
				return comparison;
			}
			set
			{
				comparison = value;
				if (comparison != null)
				{
					if (ResortOnCollectionChanged)
					{
						CollectionChanged();
					}
					else if (ResortOnCollectionItemChanged)
					{
						CollectionItemChanged();
					}
				}
			}
		}

		public int Count
		{
			get
			{
				return Items.Count;
			}
		}

		public bool IsReadOnly
		{
			get
			{
				return false;
			}
		}

		public T this[int index]
		{
			get
			{
				return Items[index];
			}
			set
			{
				RemoveCallback(Items[index]);
				Items[index] = value;
				AddCallback(Items[index]);
				CollectionChanged();
			}
		}

		public event OnChange OnChange;

		public event OnChange OnCollectionChange;

		public event OnChange OnCollectionItemChange;

		public ObservableList(bool observeItems = true)
		{
			IsItemsDisposable = observeItems && typeof(IDisposable).IsAssignableFrom(typeof(T));
			IsItemsObservable = observeItems && typeof(IObservable).IsAssignableFrom(typeof(T));
			IsItemsSupportNotifyPropertyChanged = typeof(INotifyPropertyChanged).IsAssignableFrom(typeof(T));
			Items = new List<T>();
		}

		public ObservableList(IEnumerable<T> enumerable, bool observeItems = true)
		{
			IsItemsDisposable = observeItems && typeof(IDisposable).IsAssignableFrom(typeof(T));
			IsItemsObservable = observeItems && typeof(IObservable).IsAssignableFrom(typeof(T));
			IsItemsSupportNotifyPropertyChanged = typeof(INotifyPropertyChanged).IsAssignableFrom(typeof(T));
			Items = new List<T>(enumerable);
			AddCallbacks(Items);
		}

		private void AddCallbacks(IEnumerable<T> items)
		{
			items.ForEach(AddCallback);
		}

		private void AddCallback(T item)
		{
			if (IsItemsObservable)
			{
				(item as IObservable).OnChange += CollectionItemChanged;
			}
			else if (IsItemsSupportNotifyPropertyChanged)
			{
				(item as INotifyPropertyChanged).PropertyChanged += ItemPropertyChanged;
			}
		}

		private void RemoveCallbacks(IEnumerable<T> items)
		{
			if (IsItemsObservable)
			{
				items.ForEach(delegate(T x)
				{
					(x as IObservable).OnChange -= CollectionItemChanged;
				});
			}
			else if (IsItemsSupportNotifyPropertyChanged)
			{
				items.ForEach(delegate(T x)
				{
					(x as INotifyPropertyChanged).PropertyChanged -= ItemPropertyChanged;
				});
			}
		}

		private void RemoveCallback(T item)
		{
			if (IsItemsObservable)
			{
				(item as IObservable).OnChange -= CollectionItemChanged;
			}
			else if (IsItemsSupportNotifyPropertyChanged)
			{
				(item as INotifyPropertyChanged).PropertyChanged -= ItemPropertyChanged;
			}
		}

		private void ItemPropertyChanged(object sender, PropertyChangedEventArgs e)
		{
			CollectionItemChanged();
		}

		public void CollectionChanged()
		{
			CollectionChanged(true);
		}

		private void CollectionChanged(bool reSort)
		{
			if (inUpdate)
			{
				isCollectionChanged = true;
				isChanged = true;
				return;
			}
			if (reSort && ResortOnCollectionChanged && comparison != null)
			{
				Items.Sort(comparison);
			}
			if (this.OnCollectionChange != null)
			{
				this.OnCollectionChange();
			}
			if (this.OnChange != null)
			{
				this.OnChange();
			}
		}

		public void CollectionItemChanged()
		{
			if (inUpdate)
			{
				isCollectionItemChanged = true;
				isChanged = true;
				return;
			}
			if (ResortOnCollectionItemChanged && comparison != null)
			{
				Items.Sort(comparison);
			}
			if (this.OnCollectionItemChange != null)
			{
				this.OnCollectionItemChange();
			}
			if (this.OnChange != null)
			{
				this.OnChange();
			}
		}

		[Obsolete("Use CollectionChanged() or CollectionItemChanged()")]
		public void Changed()
		{
			if (inUpdate)
			{
				isChanged = true;
			}
			else if (this.OnChange != null)
			{
				this.OnChange();
			}
		}

		public void BeginUpdate()
		{
			inUpdate = true;
			isChanged = false;
			isCollectionChanged = false;
			isCollectionItemChanged = false;
		}

		public void EndUpdate()
		{
			inUpdate = false;
			if (((isCollectionChanged && ResortOnCollectionItemChanged) || (isCollectionItemChanged && ResortOnCollectionItemChanged)) && comparison != null)
			{
				Items.Sort(comparison);
			}
			if (isCollectionChanged && this.OnCollectionChange != null)
			{
				isCollectionChanged = false;
				this.OnCollectionChange();
			}
			if (isCollectionItemChanged && this.OnCollectionItemChange != null)
			{
				isCollectionItemChanged = false;
				this.OnCollectionItemChange();
			}
			if (isChanged && this.OnChange != null)
			{
				isChanged = false;
				this.OnChange();
			}
		}

		public void Add(T item)
		{
			Items.Add(item);
			AddCallback(item);
			CollectionChanged();
		}

		public void Clear()
		{
			RemoveCallbacks(Items);
			Items.Clear();
			CollectionChanged();
		}

		public bool Contains(T item)
		{
			return Items.Contains(item);
		}

		public void CopyTo(T[] array, int arrayIndex)
		{
			Items.CopyTo(array, arrayIndex);
		}

		IEnumerator<T> IEnumerable<T>.GetEnumerator()
		{
			return Items.GetEnumerator();
		}

		IEnumerator IEnumerable.GetEnumerator()
		{
			return ((IEnumerable)Items).GetEnumerator();
		}

		public int IndexOf(T item)
		{
			return Items.IndexOf(item);
		}

		public void Insert(int index, T item)
		{
			Items.Insert(index, item);
			AddCallback(item);
			CollectionChanged();
		}

		public bool Remove(T item)
		{
			bool flag = Items.Remove(item);
			if (flag)
			{
				RemoveCallback(item);
				CollectionChanged();
			}
			return flag;
		}

		public void RemoveAt(int index)
		{
			RemoveCallback(Items[index]);
			Items.RemoveAt(index);
			CollectionChanged();
		}

		public void AddRange(IEnumerable<T> items)
		{
			Items.AddRange(items);
			AddCallbacks(items);
			CollectionChanged();
		}

		public ReadOnlyCollection<T> AsReadOnly()
		{
			return Items.AsReadOnly();
		}

		public int BinarySearch(T item)
		{
			return Items.BinarySearch(item);
		}

		public int BinarySearch(T item, IComparer<T> comparer)
		{
			return Items.BinarySearch(item, comparer);
		}

		public int BinarySearch(int index, int count, T item, IComparer<T> comparer)
		{
			return Items.BinarySearch(index, count, item, comparer);
		}

		public ObservableList<TOutput> ConvertAll<TOutput>(Converter<T, TOutput> converter, bool observeItems = true)
		{
			return new ObservableList<TOutput>(Items.Convert(converter), observeItems);
		}

		public ObservableList<TOutput> Convert<TOutput>(Converter<T, TOutput> converter, bool observeItems = true)
		{
			return new ObservableList<TOutput>(Items.Convert(converter), observeItems);
		}

		public void CopyTo(T[] array)
		{
			Items.CopyTo(array);
		}

		public void CopyTo(int index, T[] array, int arrayIndex, int count)
		{
			Items.CopyTo(index, array, arrayIndex, count);
		}

		public bool Exists(Predicate<T> match)
		{
			return Items.Exists(match);
		}

		public T Find(Predicate<T> match)
		{
			return Items.Find(match);
		}

		public ObservableList<T> FindAll(Predicate<T> match, bool observeItems = true)
		{
			return new ObservableList<T>(Items.FindAll(match), observeItems);
		}

		public int FindIndex(Predicate<T> match)
		{
			return Items.FindIndex(match);
		}

		public int FindIndex(int startIndex, Predicate<T> match)
		{
			return Items.FindIndex(startIndex, match);
		}

		public int FindIndex(int startIndex, int count, Predicate<T> match)
		{
			return Items.FindIndex(startIndex, count, match);
		}

		public T FindLast(Predicate<T> match)
		{
			return Items.FindLast(match);
		}

		public int FindLastIndex(Predicate<T> match)
		{
			return Items.FindLastIndex(match);
		}

		public int FindLastIndex(int startIndex, Predicate<T> match)
		{
			return Items.FindLastIndex(startIndex, match);
		}

		public int FindLastIndex(int startIndex, int count, Predicate<T> match)
		{
			return Items.FindLastIndex(startIndex, count, match);
		}

		public void ForEach(Action<T> action)
		{
			Items.ForEach(action);
		}

		public ObservableList<T> GetRange(int index, int count, bool observeItems = true)
		{
			return new ObservableList<T>(Items.GetRange(index, count), observeItems);
		}

		public int IndexOf(T item, int index)
		{
			return Items.IndexOf(item, index);
		}

		public int IndexOf(T item, int index, int count)
		{
			return Items.IndexOf(item, index, count);
		}

		public void InsertRange(int index, IEnumerable<T> collection)
		{
			Items.InsertRange(index, collection);
			AddCallbacks(collection);
			CollectionChanged();
		}

		public int LastIndexOf(T item)
		{
			return Items.LastIndexOf(item);
		}

		public int LastIndexOf(T item, int index)
		{
			return Items.LastIndexOf(item, index);
		}

		public int LastIndexOf(T item, int index, int count)
		{
			return Items.LastIndexOf(item, index, count);
		}

		public int RemoveAll(Predicate<T> match)
		{
			RemoveCallbacks(Items.FindAll(match));
			int result = Items.RemoveAll(match);
			CollectionChanged();
			return result;
		}

		public void RemoveRange(int index, int count)
		{
			RemoveCallbacks(Items.GetRange(index, count));
			Items.RemoveRange(index, count);
			CollectionChanged();
		}

		public void Reverse()
		{
			Items.Reverse();
			CollectionChanged();
		}

		public void Reverse(int index, int count)
		{
			Items.Reverse(index, count);
			CollectionChanged();
		}

		public void Sort()
		{
			Items.Sort();
			CollectionChanged();
		}

		public void Sort(Comparison<T> comparison)
		{
			Items.Sort(comparison);
			CollectionChanged();
		}

		public void Sort(IComparer<T> comparer)
		{
			Items.Sort(comparer);
			CollectionChanged();
		}

		public void Sort(int index, int count, IComparer<T> comparer)
		{
			Items.Sort(index, count, comparer);
			CollectionChanged();
		}

		public T[] ToArray()
		{
			return Items.ToArray();
		}

		public void TrimExcess()
		{
			Items.TrimExcess();
		}

		public bool TrueForAll(Predicate<T> match)
		{
			return Items.TrueForAll(match);
		}

		public void Dispose()
		{
			Dispose(true);
			GC.SuppressFinalize(this);
		}

		private void DisposeItem(T item)
		{
			RemoveCallback(item);
			if (IsItemsDisposable)
			{
				(item as IDisposable).Dispose();
			}
		}

		protected virtual void Dispose(bool disposing)
		{
			ResortOnCollectionChanged = false;
			ResortOnCollectionItemChanged = false;
			if (!disposed)
			{
				if (disposing)
				{
				}
				if (Items != null)
				{
					BeginUpdate();
					Items.ForEach(DisposeItem);
					EndUpdate();
					Items = null;
				}
				disposed = true;
			}
		}

		~ObservableList()
		{
			Dispose(false);
		}
	}
}