using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Threading;
using Tango.FSE.Common.Threading;

namespace Tango.FSE.UI.Threading
{
    /// <summary>
    /// Represents the default FSE <see cref="IDispatcherProvider"/> which will invoke action on the current application dispatcher.
    /// </summary>
    /// <seealso cref="Tango.PPC.Common.Threading.IDispatcherProvider" />
    public class DefaultDispatcherProvider : IDispatcherProvider
    {
        private Dispatcher _dispatcher;

        /// <summary>
        /// Initializes a new instance of the <see cref="DefaultDispatcherProvider"/> class.
        /// </summary>
        /// <param name="dispatcher">The dispatcher.</param>
        public DefaultDispatcherProvider(Dispatcher dispatcher)
        {
            _dispatcher = dispatcher;
        }

        /// <summary>
        /// Invokes the specified action asynchronously.
        /// </summary>
        /// <param name="action">The action.</param>
        public void Invoke(Action action)
        {
            _dispatcher.BeginInvoke(action);
        }

        /// <summary>
        /// Invokes the specified action synchronously.
        /// </summary>
        /// <param name="action">The action.</param>
        public void InvokeBlock(Action action)
        {
            _dispatcher.Invoke(action);
        }

        /// <summary>
        /// Forces the dispatcher message loop.
        /// </summary>
        public void DoEvents()
        {
            _dispatcher.Invoke(DispatcherPriority.Background,
                                         new Action(delegate { }));
        }
    }
}