//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="PartialDictionaryValues.cs"
//     Project: StgSharp
//     AuthorGroup: Nitload Space
//     Copyright (c) Nitload Space. All rights reserved.
//     
//     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.
//     
//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace StgSharp.Collections
{
    public partial class PartialDictionary<TKey, TValue>
    {

        internal sealed class PartialDictionaryValues : ICollection<TValue>
        {

            private readonly PartialDictionary<TKey, TValue> _values;

            public PartialDictionaryValues(
                           PartialDictionary<TKey, TValue> value )
            {
                _values = value;
            }

            public bool IsReadOnly => true;

            public int Count => _values.Count;

            void ICollection<TValue>.Add( TValue item )
            {
                return;
            }

            void ICollection<TValue>.Clear()
            {
                return;
            }

            public bool Contains( TValue item )
            {
                foreach (var kvp in _values) 
                {
                    if (kvp.Value != null && kvp.Value.Equals(item))
                    {
                        return true;
                    }
                }
                return false;
            }

            public void CopyTo( TValue[] array, int arrayIndex )
            {
                foreach (var kvp in _values)
                {
                    array[arrayIndex] = kvp.Value;
                    arrayIndex++;
                }
            }

            public IEnumerator<TValue> GetEnumerator()
            {
                foreach (var key in _values._keys)
                {
                    yield return _values._source[key];
                }
            }

            bool ICollection<TValue>.Remove( TValue item )
            {
                throw new NotSupportedException();
            }

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

        }

    }
}