/*
 * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 * 
 *  http://aws.amazon.com/apache2.0
 * 
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

using System.Collections.Generic;

namespace Amazon.Extensions.Configuration.SystemsManager.Internal
{
    public static class DictionaryExtensions
    {
        public static bool EquivalentTo<TKey, TValue>(this IDictionary<TKey, TValue> first, IDictionary<TKey, TValue> second) => EquivalentTo(first, second, null);

        public static bool EquivalentTo<TKey, TValue>(this IDictionary<TKey, TValue> first, IDictionary<TKey, TValue> second, IEqualityComparer<TValue> valueComparer)
        {
            if (first == second) return true;
            if (first == null || second == null) return false;
            if (first.Count != second.Count) return false;

            valueComparer = valueComparer ?? EqualityComparer<TValue>.Default;

            foreach (var kvp in first)
            {
                if (!second.TryGetValue(kvp.Key, out var secondValue)) return false;
                if (!valueComparer.Equals(kvp.Value, secondValue)) return false;
            }
            return true;
        }
    }
}