From def3d35fb5a2267798c2d603f5896d5f788def8c Mon Sep 17 00:00:00 2001
From: Trevor Payne <tpayne@pepperdash.com>
Date: Wed, 28 Sep 2022 00:46:05 -0500
Subject: [PATCH] fix: Add method by which to clear MeetingInfo xSig when there
 are no bookings

---
 .../Codec/iHasScheduleAwareness.cs            | 25 ++++++++++
 .../VideoCodec/VideoCodecBase.cs              | 50 +++++++++++--------
 2 files changed, 55 insertions(+), 20 deletions(-)

diff --git a/essentials-framework/Essentials Devices Common/Essentials Devices Common/Codec/iHasScheduleAwareness.cs b/essentials-framework/Essentials Devices Common/Essentials Devices Common/Codec/iHasScheduleAwareness.cs
index 9169fd7c..73ff093f 100644
--- a/essentials-framework/Essentials Devices Common/Essentials Devices Common/Codec/iHasScheduleAwareness.cs	
+++ b/essentials-framework/Essentials Devices Common/Essentials Devices Common/Codec/iHasScheduleAwareness.cs	
@@ -37,6 +37,9 @@ namespace PepperDash.Essentials.Devices.Common.Codec
 
         private int _meetingWarningMinutes = 5;
 
+        private bool _nullMeeting { get; set; }
+
+
         private Meeting _previousChangedMeeting;
 
         private eMeetingEventChangeType _previousChangeType = eMeetingEventChangeType.Unknown;
@@ -91,6 +94,23 @@ namespace PepperDash.Essentials.Devices.Common.Codec
         /// <param name="meeting"></param>
         private void OnMeetingChange(eMeetingEventChangeType changeType, Meeting meeting)
         {
+            if (meeting == null)
+            {
+                var message = _nullMeeting
+                    ? "*****************OnMeetingChange No meetings to update*****************"
+                    : "*****************OnMeetingChange No meetings present.  Clearing List*****************";
+                Debug.Console(2, message);
+                if (_nullMeeting) return;
+                _nullMeeting = true;
+                var handler = MeetingEventChange;
+                if (handler != null)
+                {
+                    handler(this, new MeetingEventArgs() { ChangeType = eMeetingEventChangeType.Unknown, Meeting = null });
+                }
+                return;
+
+            }
+            _nullMeeting = false;
             Debug.Console(2, "*****************OnMeetingChange.  id: {0} changeType: {1}**********************", meeting.Id, changeType);
             if (changeType != (changeType & meeting.NotifiedChangeTypes))
             {
@@ -119,6 +139,11 @@ namespace PepperDash.Essentials.Devices.Common.Codec
             //  Iterate the meeting list and check if any meeting need to do anything
 
             const double meetingTimeEpsilon = 0.05;
+            if (Meetings.Count < 1)
+            {
+                OnMeetingChange(eMeetingEventChangeType.Unknown, null);
+                return;
+            }
             foreach (var m in Meetings)
             {
                 var changeType = eMeetingEventChangeType.Unknown;
diff --git a/essentials-framework/Essentials Devices Common/Essentials Devices Common/VideoCodec/VideoCodecBase.cs b/essentials-framework/Essentials Devices Common/Essentials Devices Common/VideoCodec/VideoCodecBase.cs
index 13099208..3f6b106b 100644
--- a/essentials-framework/Essentials Devices Common/Essentials Devices Common/VideoCodec/VideoCodecBase.cs	
+++ b/essentials-framework/Essentials Devices Common/Essentials Devices Common/VideoCodec/VideoCodecBase.cs	
@@ -831,6 +831,10 @@ namespace PepperDash.Essentials.Devices.Common.VideoCodec
 			codec.CodecSchedule.MeetingsListHasChanged += (sender, args) => UpdateMeetingsList(codec, trilist, joinMap);
 			codec.CodecSchedule.MeetingEventChange += (sender, args) =>
 				{
+				    if (args.Meeting == null)
+				    {
+                        UpdateMeetingsList(codec, trilist, joinMap);
+                    }
 					if (args.ChangeType == eMeetingEventChangeType.MeetingStartWarning)
 					{
 						UpdateMeetingsList(codec, trilist, joinMap);
@@ -909,6 +913,12 @@ namespace PepperDash.Essentials.Devices.Common.VideoCodec
 	        var stringIndex = 0;
 	        var meetingIndex = 0;
 
+            if (meetings.Count == 0)
+            {
+                var clearBytes = XSigHelpers.ClearOutputs();
+                return Encoding.GetEncoding(XSigEncoding).GetString(clearBytes, 0, clearBytes.Length);
+            }
+
 	        var tokenArray = new XSigToken[_meetingsToDisplay * offset];
 	        /* 
 	         * Digitals
@@ -1290,28 +1300,28 @@ namespace PepperDash.Essentials.Devices.Common.VideoCodec
 			};
 
 			var joinCodec = this as IJoinCalls;
-			if (joinCodec != null)
-			{
-					trilist.SetSigFalseAction(joinMap.JoinAllCalls.JoinNumber, () => joinCodec.JoinAllCalls());
+	        if (joinCodec != null)
+	        {
+	            trilist.SetSigFalseAction(joinMap.JoinAllCalls.JoinNumber, () => joinCodec.JoinAllCalls());
 
-					for (int i = 0; i < joinMap.JoinCallStart.JoinSpan; i++)
-					{
-							trilist.SetSigFalseAction((uint)(joinMap.JoinCallStart.JoinNumber + i), () =>
-									{
-											var call = ActiveCalls[i];
-											if (call != null)
-											{
-													joinCodec.JoinCall(call);
-											} 
-											else
-											{
-													Debug.Console(0, this, "[Join Call] Unable to find call at index '{0}'", i);
-											}
-									});
-					}
-			}
+	            for (int i = 0; i < joinMap.JoinCallStart.JoinSpan; i++)
+	            {
+	                trilist.SetSigFalseAction((uint) (joinMap.JoinCallStart.JoinNumber + i), () =>
+	                {
+	                    var call = ActiveCalls[i];
+	                    if (call != null)
+	                    {
+	                        joinCodec.JoinCall(call);
+	                    }
+	                    else
+	                    {
+	                        Debug.Console(0, this, "[Join Call] Unable to find call at index '{0}'", i);
+	                    }
+	                });
+	            }
+	        }
 
-			var holdCodec = this as IHasCallHold;
+	        var holdCodec = this as IHasCallHold;
 			if (holdCodec != null)
 			{
 					trilist.SetSigFalseAction(joinMap.HoldAllCalls.JoinNumber, () =>