using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using TINK.Model.Services.CopriApi.ServerUris;

namespace TINK.Model.Connector
{
	/// <summary> View model managing active uri and sets of uris. </summary>
	public class CopriServerUriListViewModel : INotifyPropertyChanged
	{
		/// <summary>
		/// Object holding active uris.
		/// </summary>
		private CopriServerUriList m_oUris;

		/// <summary>
		/// Fired whenever a property changes.
		/// </summary>
		public event PropertyChangedEventHandler PropertyChanged;

		/// <summary>Maps uris to user fiendly descriptions.</summary>
		private Dictionary<string, string> uriToServerText;

		/// <summary>Maps user fiendly descriptions to uris.</summary>
		private Dictionary<string, string> serverTextToUri;

		public CopriServerUriListViewModel(CopriServerUriList p_oSource)
		{
			uriToServerText = new Dictionary<string, string> {
				{ CopriServerUriList.TINK_DEVEL, "TINK-Konrad-devellopment" },
				{ CopriServerUriList.TINK_LIVE, "TINK-Konrad-live" },
				{ CopriServerUriList.SHAREE_DEVEL, "Sharee-fr01-devellopment" },
				{ CopriServerUriList.SHAREE_LIVE, "Sharee-fr01-live" }
			};

			serverTextToUri = uriToServerText.ToDictionary(x => x.Value, x => x.Key);

			m_oUris = new CopriServerUriList(p_oSource);
			NextActiveUri = m_oUris.ActiveUri;

		}


		/// <summary> Gets the known uris text, i.e. binds to picker ItemsSource. </summary>
		public IList<string> ServerTextList
		{
			get
			{
				return m_oUris.Uris.Select(x => (uriToServerText.ContainsKey(x.AbsoluteUri) ? uriToServerText[x.AbsoluteUri] : x.AbsoluteUri)).OrderBy(x => x).ToList();
			}
		}

		/// <summary> Holds the uri which will be applied after restart of app. </summary>
		public Uri NextActiveUri { get; private set; }

		/// <summary> Holds the active uri, i.e. binds to picker SelectedItem. </summary>
		public string NextActiveServerText
		{
			get
			{
				return uriToServerText.ContainsKey(NextActiveUri.AbsoluteUri) ? uriToServerText[NextActiveUri.AbsoluteUri] : NextActiveUri.AbsoluteUri;
			}

			set
			{
				NextActiveUri = new Uri(serverTextToUri.ContainsKey(value) ? serverTextToUri[value] : value);

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

		/// <summary> Holds the description of the picker, i.e. binds to label Text.</summary>
		public string CorpiServerUriDescription
		{
			get
			{
				return m_oUris.ActiveUri.AbsoluteUri == NextActiveUri.AbsoluteUri
					? "Aktiver Copri- Server"
					: "Copri- Server.\r\nNeustart erforderlich für Wechsel!";
			}
		}

	}
}