using System;
using System.Collections.Generic;

namespace zero.Core.Extensions
{
  public static class DictionaryExtensions
  {
    public static bool TryGetValue<T>(this Dictionary<string, object> model, string key, out T value)
    {
      if (!model.TryGetValue(key, out object valueObj) || !(valueObj is T))
      {
        value = default;
        return false;
      }

      value = (T)valueObj;
      return true;
    }


    public static T GetValueOrDefault<T>(this Dictionary<string, object> model, string key)
    {
      object value = model.GetValueOrDefault(key);
      return value == default || !(value is T) ? default : (T)value; 
    }


    public static Dictionary<TKey, TElement> ToDistinctDictionary<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector)
    {
      Dictionary<TKey, TElement> result = new();

      foreach (TSource sourceElement in source)
      {
        result.TryAdd(keySelector(sourceElement), elementSelector(sourceElement));
      }

      return result;
    }
  }
}