#if FAT

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

namespace LinqInternal.Collections.Specialized
{
    internal sealed class ConvertedValueCollection<TKey, TInput, TValue> : ICollection<TValue>, ICollection, IReadOnlyCollection<TValue>
    {
        private readonly IDictionary<TKey, TInput> _wrapped;
        private readonly Func<TInput, TValue> _converter;

        internal ConvertedValueCollection(IDictionary<TKey, TInput> wrapped, Func<TInput, TValue> converter)
        {
            if (wrapped == null)
            {
                throw new ArgumentNullException("wrapped");
            }
            if (converter == null)
            {
                throw new ArgumentNullException("converter");
            }
            _wrapped = wrapped;
            _converter = converter;
        }

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

        bool ICollection.IsSynchronized
        {
            get { return ((ICollection)_wrapped).IsSynchronized; }
        }

        object ICollection.SyncRoot
        {
            get { return ((ICollection)_wrapped).SyncRoot; }
        }

        bool ICollection<TValue>.IsReadOnly
        {
            get { return true; }
        }

        public void CopyTo(TValue[] array, int arrayIndex)
        {
            Extensions.CanCopyTo(_wrapped.Count, array, arrayIndex);
            _wrapped.ConvertProgressive
                (
                    pair =>
                    {
                        var converter = _converter;
                        return converter(pair.Value);
                    }
                ).CopyTo(array, arrayIndex);
        }

        public IEnumerator<TValue> GetEnumerator()
        {
            return _wrapped.ConvertProgressive
                (
                    pair =>
                    {
                        var converter = _converter;
                        return converter(pair.Value);
                    }
                ).GetEnumerator();
        }

        void ICollection.CopyTo(Array array, int index)
        {
            ((ICollection)_wrapped).CopyTo(array, index);
        }

        void ICollection<TValue>.Add(TValue item)
        {
            throw new NotSupportedException();
        }

        void ICollection<TValue>.Clear()
        {
            throw new NotSupportedException();
        }

        bool ICollection<TValue>.Contains(TValue item)
        {
            return _wrapped.Where
                (
                    pair =>
                    {
                        var converter = _converter;
                        return EqualityComparer<TValue>.Default.Equals(item, converter(pair.Value));
                    }
                ).HasAtLeast(1);
        }

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

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

#endif