using System;
using System.Concurrency;
using System.Linq;
using MahTweets.Mango.Core.Extensions.MahTweets.Core.Extensions;
using MahTweets.Mango.Core.Models;

namespace MahTweets.Mango.Core
{
    public class DirectMessageStatusSubscriber : IStatusSubscriber
    {
        private readonly IScheduler _scheduler;

        public DirectMessageStatusSubscriber()
            : this(Scheduler.ThreadPool)
        {
        }

        public DirectMessageStatusSubscriber(IScheduler scheduler)
        {
            _scheduler = scheduler;
        }

        public IDisposable Subscribe(IObservable<StatusUpdate> source, IObserver<StatusUpdate> target)
        {
            return source
                .ObserveOn(_scheduler)
                .Where(update => update.Types.HasType("Direct Message"))
                .Subscribe(target);
        }

        public string SubscriberName
        {
            get { return SubscriberNames.DirectMessages; }
        }
    }
}