sharee.bike-App/SharedBusinessLogic/Services/ServicesContainerMutable.cs

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

namespace ShareeBike.Services
{
	public class ServicesContainerMutable : IEnumerable<string>, INotifyPropertyChanged, IServicesContainer<string>
	{
		private readonly Dictionary<string, string> serviceDict;

		public event PropertyChangedEventHandler PropertyChanged;

		/// <summary> Constructs object on startup of app.</summary>
		/// <param name="services">Fixed list of service- objects .</param>
		/// <param name="activeName">LocksService name which is activated on startup of app.</param>
		public ServicesContainerMutable(
			IEnumerable<string> services,
			string activeName)
		{
			serviceDict = services.Distinct().ToDictionary(x => x);

			if (!serviceDict.ContainsKey(activeName))
			{
				throw new ArgumentException($"Can not instantiate {typeof(string).Name}- object. Active lock service {activeName} must be contained in [{String.Join(",", serviceDict)}].");
			}

			Active = serviceDict[activeName];
		}

		/// <summary> Active locks service.</summary>
		public string Active { get; private set; }

		/// <summary> Sets a lock service as active locks service by name. </summary>
		/// <param name="active">Name of the new locks service.</param>
		public void SetActive(string active)
		{
			if (!serviceDict.ContainsKey(active))
			{
				throw new ArgumentException($"Can not set active lock service {active}. Service must be contained in [{String.Join(",", serviceDict)}].");
			}

			Active = serviceDict[active];

			PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Active)));
		}

		public IEnumerator<string> GetEnumerator()
			=> serviceDict.Values.GetEnumerator();

		IEnumerator IEnumerable.GetEnumerator()
			=> serviceDict.Values.GetEnumerator();
	}
}