using Microsoft.Practices.Prism.ViewModel;
using System.Collections.Generic;
using System.Linq;

namespace DTS.Common.BusyIndicatorManager
{
    public class BusyIndicatorManager : NotificationObject
    {
        #region Membervariables

        private Dictionary<int, string> busyParameters;

        #endregion

        #region Constructor

        private BusyIndicatorManager()
        {
            _isBusy = false;
            _message = string.Empty;
            busyParameters = new Dictionary<int, string>();
        }

        #endregion

        #region Singleton Implementation

        private static BusyIndicatorManager _instance;
        private static readonly object SyncRoot = new object();

        public static BusyIndicatorManager Instance
        {
            get
            {
                lock (SyncRoot)
                {
                    return _instance ?? (_instance = new BusyIndicatorManager());
                }
            }
        }

        #endregion

        #region Public Properties

        private bool _isBusy;

        public bool IsBusy
        {
            get => _isBusy;
            private set
            {
                _isBusy = value;
                RaisePropertyChanged("IsBusy");
            }
        }

        private string _message;

        public string Message
        {
            get => _message;
            private set
            {
                _message = value;
                RaisePropertyChanged("Message");
            }
        }

        #endregion

        #region Public Methods

        public void ShowBusy(int id, string busyMessage)
        {
            if (!busyParameters.ContainsKey(id))
            {
                busyParameters.Add(id, busyMessage);
                IsBusy = true;
                Message = busyMessage;
            }
            else
            {
                busyParameters[id] = busyMessage;
                IsBusy = true;
                Message = busyMessage;
            }
        }

        public void CloseBusy(int id)
        {
            if (busyParameters.ContainsKey(id))
                busyParameters.Remove(id);

            if (busyParameters.Count == 0)
            {
                IsBusy = false;
                Message = string.Empty;
            }
            else
            {
                IsBusy = true;
                Message = busyParameters.Last().Value;
            }
        }

        #endregion
    }
}