using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading;
using AspClassic.Scripting.Utils;

namespace AspClassic.Scripting.Runtime;

internal sealed class SymbolDictionary : BaseSymbolDictionary, IDictionary, ICollection, IDictionary<object, object>, ICollection<KeyValuePair<object, object>>, IAttributesCollection, IEnumerable<KeyValuePair<object, object>>, IEnumerable
{
	private Dictionary<SymbolId, object> _data = new Dictionary<SymbolId, object>();

	ICollection<object> IDictionary<object, object>.Keys
	{
		get
		{
			List<object> list = new List<object>();
			lock (this)
			{
				foreach (SymbolId key in _data.Keys)
				{
					if (!(key == BaseSymbolDictionary.ObjectKeys))
					{
						list.Add(SymbolTable.IdToString(key));
					}
				}
				Dictionary<object, object> objectKeysDictionaryIfExists = GetObjectKeysDictionaryIfExists();
				if (objectKeysDictionaryIfExists != null)
				{
					list.AddRange(objectKeysDictionaryIfExists.Keys);
					return list;
				}
				return list;
			}
		}
	}

	ICollection<object> IDictionary<object, object>.Values
	{
		get
		{
			lock (this)
			{
				Dictionary<object, object> objectKeysDictionaryIfExists = GetObjectKeysDictionaryIfExists();
				if (objectKeysDictionaryIfExists == null)
				{
					return _data.Values;
				}
				List<object> list = new List<object>();
				foreach (KeyValuePair<SymbolId, object> datum in _data)
				{
					if (!(datum.Key == BaseSymbolDictionary.ObjectKeys))
					{
						list.Add(datum.Value);
					}
				}
				foreach (object value in objectKeysDictionaryIfExists.Values)
				{
					list.Add(value);
				}
				return list;
			}
		}
	}

	public object this[object key]
	{
		get
		{
			string text = key as string;
			lock (this)
			{
				if (text != null)
				{
					if (_data.TryGetValue(SymbolTable.StringToId(text), out var value))
					{
						return value;
					}
				}
				else
				{
					Dictionary<object, object> objectKeysDictionaryIfExists = GetObjectKeysDictionaryIfExists();
					if (objectKeysDictionaryIfExists != null)
					{
						return objectKeysDictionaryIfExists[key];
					}
				}
			}
			throw new KeyNotFoundException($"'{key}'");
		}
		set
		{
			string text = key as string;
			lock (this)
			{
				if (text != null)
				{
					_data[SymbolTable.StringToId(text)] = value;
					return;
				}
				Dictionary<object, object> objectKeysDictionary = GetObjectKeysDictionary();
				objectKeysDictionary[key] = value;
			}
		}
	}

	public int Count
	{
		get
		{
			lock (this)
			{
				int num = _data.Count;
				Dictionary<object, object> objectKeysDictionaryIfExists = GetObjectKeysDictionaryIfExists();
				if (objectKeysDictionaryIfExists != null)
				{
					num += objectKeysDictionaryIfExists.Count - 1;
				}
				return num;
			}
		}
	}

	public bool IsReadOnly => false;

	object IAttributesCollection.this[SymbolId name]
	{
		get
		{
			lock (this)
			{
				return _data[name];
			}
		}
		set
		{
			lock (this)
			{
				_data[name] = value;
			}
		}
	}

	public IDictionary<SymbolId, object> SymbolAttributes
	{
		get
		{
			lock (this)
			{
				if (GetObjectKeysDictionaryIfExists() == null)
				{
					return _data;
				}
				Dictionary<SymbolId, object> dictionary = new Dictionary<SymbolId, object>();
				foreach (KeyValuePair<SymbolId, object> datum in _data)
				{
					if (!(datum.Key == BaseSymbolDictionary.ObjectKeys))
					{
						dictionary.Add(datum.Key, datum.Value);
					}
				}
				return dictionary;
			}
		}
	}

	public ICollection<object> Keys => AsObjectKeyedDictionary().Keys;

	public bool IsFixedSize => false;

	ICollection IDictionary.Keys
	{
		get
		{
			List<object> list = new List<object>();
			lock (this)
			{
				foreach (SymbolId key in _data.Keys)
				{
					if (!(key == BaseSymbolDictionary.ObjectKeys))
					{
						list.Add(SymbolTable.IdToString(key));
					}
				}
				Dictionary<object, object> objectKeysDictionaryIfExists = GetObjectKeysDictionaryIfExists();
				if (objectKeysDictionaryIfExists != null)
				{
					list.AddRange(objectKeysDictionaryIfExists.Keys);
					return list;
				}
				return list;
			}
		}
	}

	ICollection IDictionary.Values
	{
		get
		{
			List<object> list = new List<object>();
			lock (this)
			{
				foreach (KeyValuePair<SymbolId, object> datum in _data)
				{
					if (!(datum.Key == BaseSymbolDictionary.ObjectKeys))
					{
						list.Add(datum.Value);
					}
				}
				Dictionary<object, object> objectKeysDictionaryIfExists = GetObjectKeysDictionaryIfExists();
				if (objectKeysDictionaryIfExists != null)
				{
					list.AddRange(objectKeysDictionaryIfExists.Values);
					return list;
				}
				return list;
			}
		}
	}

	object IDictionary.this[object key]
	{
		get
		{
			return AsObjectKeyedDictionary()[key];
		}
		set
		{
			AsObjectKeyedDictionary()[key] = value;
		}
	}

	public bool IsSynchronized => true;

	public object SyncRoot => this;

	public SymbolDictionary()
	{
	}

	public SymbolDictionary(IAttributesCollection from)
	{
		lock (from)
		{
			foreach (KeyValuePair<object, object> item in from)
			{
				AsObjectKeyedDictionary().Add(item.Key, item.Value);
			}
		}
	}

	private Dictionary<object, object> GetObjectKeysDictionary()
	{
		Dictionary<object, object> dictionary = GetObjectKeysDictionaryIfExists();
		if (dictionary == null)
		{
			dictionary = new Dictionary<object, object>();
			_data.Add(BaseSymbolDictionary.ObjectKeys, dictionary);
		}
		return dictionary;
	}

	private Dictionary<object, object> GetObjectKeysDictionaryIfExists()
	{
		if (_data.TryGetValue(BaseSymbolDictionary.ObjectKeys, out var value))
		{
			return (Dictionary<object, object>)value;
		}
		return null;
	}

	void IDictionary<object, object>.Add(object key, object value)
	{
		string text = key as string;
		lock (this)
		{
			if (text != null)
			{
				_data.Add(SymbolTable.StringToId(text), value);
				return;
			}
			Dictionary<object, object> objectKeysDictionary = GetObjectKeysDictionary();
			objectKeysDictionary[key] = value;
		}
	}

	bool IDictionary<object, object>.ContainsKey(object key)
	{
		string text = key as string;
		lock (this)
		{
			if (text != null)
			{
				if (!SymbolTable.StringHasId(text))
				{
					return false;
				}
				return _data.ContainsKey(SymbolTable.StringToId(text));
			}
			return GetObjectKeysDictionaryIfExists()?.ContainsKey(key) ?? false;
		}
	}

	bool IDictionary<object, object>.Remove(object key)
	{
		string text = key as string;
		lock (this)
		{
			if (text != null)
			{
				return _data.Remove(SymbolTable.StringToId(text));
			}
			return GetObjectKeysDictionaryIfExists()?.Remove(key) ?? false;
		}
	}

	bool IDictionary<object, object>.TryGetValue(object key, out object value)
	{
		string text = key as string;
		lock (this)
		{
			if (text != null)
			{
				return _data.TryGetValue(SymbolTable.StringToId(text), out value);
			}
			value = null;
			return GetObjectKeysDictionaryIfExists()?.TryGetValue(key, out value) ?? false;
		}
	}

	public void Add(KeyValuePair<object, object> item)
	{
		string text = item.Key as string;
		lock (this)
		{
			if (text != null)
			{
				_data.Add(SymbolTable.StringToId(text), item.Value);
				return;
			}
			Dictionary<object, object> objectKeysDictionary = GetObjectKeysDictionary();
			objectKeysDictionary[item.Key] = item.Value;
		}
	}

	public void Clear()
	{
		lock (this)
		{
			_data.Clear();
		}
	}

	public bool Contains(KeyValuePair<object, object> item)
	{
		if (AsObjectKeyedDictionary().TryGetValue(item.Key, out var value) && value == item.Value)
		{
			return true;
		}
		return false;
	}

	public void CopyTo(KeyValuePair<object, object>[] array, int arrayIndex)
	{
		ContractUtils.RequiresNotNull(array, "array");
		lock (this)
		{
			ContractUtils.RequiresArrayRange(array, arrayIndex, Count, "arrayIndex", "array");
			foreach (KeyValuePair<object, object> item in (IEnumerable<KeyValuePair<object, object>>)this)
			{
				array[arrayIndex++] = item;
			}
		}
	}

	public bool Remove(KeyValuePair<object, object> item)
	{
		lock (this)
		{
			if (item.Key is string text && AsObjectKeyedDictionary().TryGetValue(text, out var value) && value == item.Value)
			{
				_data.Remove(SymbolTable.StringToId(text));
				return true;
			}
		}
		return false;
	}

	IEnumerator<KeyValuePair<object, object>> IEnumerable<KeyValuePair<object, object>>.GetEnumerator()
	{
		bool lockTaken = false;
		SymbolDictionary obj2 = default(SymbolDictionary);
		try
		{
			SymbolDictionary obj;
			obj2 = (obj = this);
			Monitor.Enter(obj, ref lockTaken);
			foreach (KeyValuePair<SymbolId, object> o in _data)
			{
				KeyValuePair<SymbolId, object> keyValuePair = o;
				if (!(keyValuePair.Key == BaseSymbolDictionary.ObjectKeys))
				{
					KeyValuePair<SymbolId, object> keyValuePair2 = o;
					string key = SymbolTable.IdToString(keyValuePair2.Key);
					KeyValuePair<SymbolId, object> keyValuePair3 = o;
					yield return new KeyValuePair<object, object>(key, keyValuePair3.Value);
				}
			}
			Dictionary<object, object> objData = GetObjectKeysDictionaryIfExists();
			if (objData == null)
			{
				yield break;
			}
			foreach (KeyValuePair<object, object> item in objData)
			{
				yield return item;
			}
		}
		finally
		{
			if (lockTaken)
			{
				Monitor.Exit(obj2);
			}
		}
	}

	public IEnumerator GetEnumerator()
	{
		foreach (KeyValuePair<SymbolId, object> o in _data)
		{
			KeyValuePair<SymbolId, object> keyValuePair = o;
			if (!(keyValuePair.Key == BaseSymbolDictionary.ObjectKeys))
			{
				KeyValuePair<SymbolId, object> keyValuePair2 = o;
				yield return SymbolTable.IdToString(keyValuePair2.Key);
			}
		}
		IDictionary<object, object> objData = GetObjectKeysDictionaryIfExists();
		if (objData == null)
		{
			yield break;
		}
		foreach (object key in objData.Keys)
		{
			yield return key;
		}
	}

	public void Add(SymbolId name, object value)
	{
		lock (this)
		{
			_data.Add(name, value);
		}
	}

	public bool ContainsKey(SymbolId name)
	{
		lock (this)
		{
			return _data.ContainsKey(name);
		}
	}

	public bool Remove(SymbolId name)
	{
		lock (this)
		{
			return _data.Remove(name);
		}
	}

	public bool TryGetValue(SymbolId name, out object value)
	{
		lock (this)
		{
			return _data.TryGetValue(name, out value);
		}
	}

	public void AddObjectKey(object name, object value)
	{
		AsObjectKeyedDictionary().Add(name, value);
	}

	public bool ContainsObjectKey(object name)
	{
		return AsObjectKeyedDictionary().ContainsKey(name);
	}

	public bool RemoveObjectKey(object name)
	{
		return AsObjectKeyedDictionary().Remove(name);
	}

	public bool TryGetObjectValue(object name, out object value)
	{
		return AsObjectKeyedDictionary().TryGetValue(name, out value);
	}

	public IDictionary<object, object> AsObjectKeyedDictionary()
	{
		return this;
	}

	void IDictionary.Add(object key, object value)
	{
		AsObjectKeyedDictionary().Add(key, value);
	}

	public bool Contains(object key)
	{
		lock (this)
		{
			return AsObjectKeyedDictionary().ContainsKey(key);
		}
	}

	IDictionaryEnumerator IDictionary.GetEnumerator()
	{
		Dictionary<object, object> objectKeysDictionaryIfExists = GetObjectKeysDictionaryIfExists();
		if (objectKeysDictionaryIfExists == null)
		{
			return new TransformDictionaryEnumerator(_data);
		}
		List<IDictionaryEnumerator> list = new List<IDictionaryEnumerator>();
		list.Add(new TransformDictionaryEnumerator(_data));
		Dictionary<object, object>.Enumerator enumerator = objectKeysDictionaryIfExists.GetEnumerator();
		list.Add(enumerator);
		return new DictionaryUnionEnumerator(list);
	}

	void IDictionary.Remove(object key)
	{
		string text = key as string;
		lock (this)
		{
			if (text != null)
			{
				_data.Remove(SymbolTable.StringToId(text));
			}
			else
			{
				GetObjectKeysDictionaryIfExists()?.Remove(key);
			}
		}
	}

	public void CopyTo(Array array, int index)
	{
		ContractUtils.RequiresNotNull(array, "array");
		lock (this)
		{
			ContractUtils.RequiresListRange(array, index, Count, "index", "array");
			IEnumerator enumerator = GetEnumerator();
			try
			{
				while (enumerator.MoveNext())
				{
					object current = enumerator.Current;
					array.SetValue(current, index++);
				}
			}
			finally
			{
				IDisposable disposable = enumerator as IDisposable;
				if (disposable != null)
				{
					disposable.Dispose();
				}
			}
		}
	}
}