using System;
using System.ComponentModel;
using System.Threading.Tasks;
using System.Windows.Threading;
using DTS.Common.Events;
using DTS.Common.Interactivity;
using Prism.Commands;
using Prism.Events;
using Prism.Regions;
using Unity;
// ReSharper disable once CheckNamespace
namespace DTS.Common.Base
{
    public abstract class BaseViewModel<TModel> : BasePropertyChanged, IBaseViewModel
        where TModel : class
    {

        protected IEventAggregator Aggregator { get; private set; }
        protected IUnityContainer Container { get; private set; }
        public TModel Model { get; set; }

        protected BaseViewModel()
        {

        }

        protected BaseViewModel(IRegionManager regionManager, IEventAggregator eventAggregator, IUnityContainer unityContainer)
        {
            Aggregator = eventAggregator;
            Container = unityContainer;
            CreateCommands();
        }


        protected virtual void CreateCommands()
        {
            ConfirmationRequest = new InteractionRequest<Confirmation>();
            CloseCommand = new DelegateCommand<object>(CloseMethod);
        }

        #region Commands

        /// <summary>
        /// The interaction request to display the confirmation.
        /// </summary>
        public InteractionRequest<Confirmation> ConfirmationRequest { get; private set; }

        /// <summary>
        /// The delegate command to close object.
        /// </summary>
        public DelegateCommand<object> CloseCommand { get; private set; }

        /// <summary>
        /// This is an execute method for the <see cref="CloseCommand">CloseCommand</see>.
        /// </summary>
        /// <param name="parameter">The parameter to pass to the <see cref="CloseCommand">CloseCommand</see>.</param>
        protected virtual void CloseMethod(object parameter)
        {
            CleanupAtClose();
        }

        private void CleanupAtClose()
        {
            Cleanup();
        }

        #endregion Commands

        #region Bases Methods

        /// <summary>
        /// Executes after the viewmodel activated.
        /// </summary>
        public virtual void Activated()
        {
        }

        /// <summary>
        /// Publishes the <see cref="ShowStatus">ShowStatus</see> during the viewmodel initialization. 
        /// </summary>
        public virtual void Initialize()
        {
            Aggregator.GetEvent<ShowStatus>()
                .Publish(new StatusInfo(StatusInfo.StatusState.Busy, Strings.Strings.Loading));
        }

        /// <summary>
        /// Publishes the <see cref="ShowStatus">ShowStatus</see> during the viewmodel initialization. 
        /// </summary>
        /// <param name="parameter">The parameter to be used initialize viewmodel.</param>
        public virtual void Initialize(object parameter)
        {
            Aggregator.GetEvent<ShowStatus>()
                .Publish(new StatusInfo(StatusInfo.StatusState.Busy, Strings.Strings.Loading));
        }

        public virtual void Initialize(object parameter, object model)
        {

        }

        /// <summary>
        /// Publishes the <see cref="ShowStatus">ShowStatus</see> during the viewmodel initialization. 
        /// </summary>
        public virtual async Task InitializeAsync()
        {
            await Dispatcher.CurrentDispatcher.InvokeAsync(() =>
            {
                Aggregator.GetEvent<ShowStatus>()
                    .Publish(new StatusInfo(StatusInfo.StatusState.Busy, Strings.Strings.Loading));
            });
        }

        /// <summary>
        /// Publishes the <see cref="ShowStatus">ShowStatus</see> during the viewmodel initialization. 
        /// </summary>
        /// <param name="parameter">The parameter to be used initialize viewmodel.</param>
        public virtual async Task InitializeAsync(object parameter)
        {
            await Dispatcher.CurrentDispatcher.InvokeAsync(() =>
            {
                Aggregator.GetEvent<ShowStatus>()
                    .Publish(new StatusInfo(StatusInfo.StatusState.Busy, Strings.Strings.Loading));
            });
        }

        #endregion Bases Methods

        public new event PropertyChangedEventHandler PropertyChanged;
        public bool IsMenuIncluded { get; set; }
        public bool IsNavigationIncluded { get; set; }
        public int Percentage { get; set; }
        public string IsBusyMessage { get; set; }
        public bool IsBusy { get; set; }


        public bool IsDirty { get; set; }
        /// <summary>
        /// Sets the Model to null.
        /// </summary>
        public virtual void Cleanup()
        {
            Model = default(TModel);
        }

        public Task CleanupAsync()
        {
            return Task.CompletedTask;
        }

    }
}