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>
    /// Sets the active uri.
    /// </summary>
    private Uri ActiveUri
        {
            set
            {
                if (m_oUris.ActiveUri.AbsoluteUri == value.AbsoluteUri)
                {
                    /// Nothing to do.
                    return;
                }

                m_oUris = new CopriServerUriList(m_oUris.Uris.ToArray(), value);
            }
        }

        /// <summary> Gets the known uris. </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 uri which will be applied after restart. </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.</summary>
        public string CorpiServerUriDescription
        {
            get
            {
                return m_oUris.ActiveUri.AbsoluteUri == NextActiveUri.AbsoluteUri
                    ? "Aktiver Copri- Server"
                    : "Copri- Server.\r\nNeustart erforderlich für Wechsel!";
            }
        }

    }
}