Rewrite syncplay using a state design pattern

MediaBrowser.Model/SyncPlay/GroupState.cs

@@ -0,0 +1,25 @@
+namespace MediaBrowser.Model.SyncPlay
+{
+    /// <summary>
+    /// Enum GroupState.
+    /// </summary>
+    public enum GroupState
+    {
+        /// <summary>
+        /// The group is in idle state. No media is playing.
+        /// </summary>
+        Idle,
+        /// <summary>
+        /// The group is in wating state. Playback is paused. Will start playing when users are ready.
+        /// </summary>
+        Waiting,
+        /// <summary>
+        /// The group is in paused state. Playback is paused. Will resume on play command.
+        /// </summary>
+        Paused,
+        /// <summary>
+        /// The group is in playing state. Playback is advancing.
+        /// </summary>
+        Playing
+    }
+}

MediaBrowser.Model/SyncPlay/PlaybackRequest.cs

@@ -1,34 +0,0 @@
-using System;
-
-namespace MediaBrowser.Model.SyncPlay
-{
-    /// <summary>
-    /// Class PlaybackRequest.
-    /// </summary>
-    public class PlaybackRequest
-    {
-        /// <summary>
-        /// Gets or sets the request type.
-        /// </summary>
-        /// <value>The request type.</value>
-        public PlaybackRequestType Type { get; set; }
-
-        /// <summary>
-        /// Gets or sets when the request has been made by the client.
-        /// </summary>
-        /// <value>The date of the request.</value>
-        public DateTime? When { get; set; }
-
-        /// <summary>
-        /// Gets or sets the position ticks.
-        /// </summary>
-        /// <value>The position ticks.</value>
-        public long? PositionTicks { get; set; }
-
-        /// <summary>
-        /// Gets or sets the ping time.
-        /// </summary>
-        /// <value>The ping time.</value>
-        public long? Ping { get; set; }
-    }
-}

MediaBrowser.Model/SyncPlay/SyncPlayBroadcastType.cs

@@ -0,0 +1,28 @@
+namespace MediaBrowser.Model.SyncPlay
+{
+    /// <summary>
+    /// Used to filter the sessions of a group.
+    /// </summary>
+    public enum SyncPlayBroadcastType
+    {
+        /// <summary>
+        /// All sessions will receive the message.
+        /// </summary>
+        AllGroup = 0,
+
+        /// <summary>
+        /// Only the specified session will receive the message.
+        /// </summary>
+        CurrentSession = 1,
+
+        /// <summary>
+        /// All sessions, except the current one, will receive the message.
+        /// </summary>
+        AllExceptCurrentSession = 2,
+
+        /// <summary>
+        /// Only sessions that are not buffering will receive the message.
+        /// </summary>
+        AllReady = 3
+    }
+}