using System.Collections.Generic;

namespace NEG.Utils.Collections
{
    public static class DictionaryExtensions
    {
        /// <summary>
        /// Adds an element to a dictionary if there was none assigned to specified <paramref name="key"/>, otherwise replaces the existing 
        /// </summary>
        /// <returns>true if element was added, false if it was replaced</returns>
        public static bool AddOrUpdate<K, V>(this Dictionary<K, V> dict, K key, V value)
        {
            if (dict.ContainsKey(key))
            {
                dict[key] = value;
                return false;
            }
            else
            {
                dict.Add(key, value);
                return true;
            }
        }


        /// <summary>
        /// Gets a value from the dictionary under a specified key or sets it if there was no assoiation then return the associated value
        /// </summary>
        /// <returns></returns>
        public static V GetOrSetToDefault<K, V>(this Dictionary<K, V> dict, K key, V defaultValue)
        {
            if (dict.TryGetValue(key, out V value))
            {
                return value;
            }
            dict.Add(key, defaultValue);

            return defaultValue;
        }
    }
}