using System.Collections;
using System.Collections.Generic;

/// <summary>
/// Copyright
/// MIT License
/// 
/// Copyright Fizz Cube Ltd(c) 2018 
/// 
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
/// 
/// The above copyright notice and this permission notice shall be included in all
/// copies or substantial portions of the Software.
/// 
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
/// SOFTWARE.
/// 
/// ===
///
/// Copyright Marco Hoffmann(c) 2020
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
///furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in all
/// copies or substantial portions of the Software.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
/// SOFTWARE.
///
/// MIT License
/// </summary>

namespace EpicTransport;

public class BidirectionalDictionary<T1, T2> : IEnumerable
{
	private Dictionary<T1, T2> t1ToT2Dict = new();
	private Dictionary<T2, T1> t2ToT1Dict = new();

	public IEnumerable<T1> FirstTypes => t1ToT2Dict.Keys;
	public IEnumerable<T2> SecondTypes => t2ToT1Dict.Keys;

	public IEnumerator GetEnumerator() => t1ToT2Dict.GetEnumerator();

	public int Count => t1ToT2Dict.Count;

	public void Add(T1 key, T2 value)
	{
		t1ToT2Dict[key] = value;
		t2ToT1Dict[value] = key;
	}

	public void Add(T2 key, T1 value)
	{
		t2ToT1Dict[key] = value;
		t1ToT2Dict[value] = key;
	}

	public T2 Get(T1 key) => t1ToT2Dict[key];

	public T1 Get(T2 key) => t2ToT1Dict[key];

	public bool TryGetValue(T1 key, out T2 value) => t1ToT2Dict.TryGetValue(key, out value);

	public bool TryGetValue(T2 key, out T1 value) => t2ToT1Dict.TryGetValue(key, out value);

	public bool Contains(T1 key) => t1ToT2Dict.ContainsKey(key);

	public bool Contains(T2 key) => t2ToT1Dict.ContainsKey(key);

	public void Remove(T1 key)
	{
		if (Contains(key))
		{
			var val = t1ToT2Dict[key];
			t1ToT2Dict.Remove(key);
			t2ToT1Dict.Remove(val);
		}
	}

	public void Remove(T2 key)
	{
		if (Contains(key))
		{
			var val = t2ToT1Dict[key];
			t1ToT2Dict.Remove(val);
			t2ToT1Dict.Remove(key);
		}
	}

	public T1 this[T2 key]
	{
		get => t2ToT1Dict[key];
		set
		{
			t2ToT1Dict[key] = value;
			t1ToT2Dict[value] = key;
		}
	}

	public T2 this[T1 key]
	{
		get => t1ToT2Dict[key];
		set
		{
			t1ToT2Dict[key] = value;
			t2ToT1Dict[value] = key;
		}
	}
}