Resume stale graphical CCS interviews

api/QuestionsApi/Services/CcsStore.cs

@@ -436,6 +436,9 @@ public sealed class CcsStore
             : [new CcsVitalSnapshot { SimulatedMinute = attempt.SimulatedMinute, Values = new Dictionary<string, string>(attempt.CurrentVitals) }];
         CcsInterviewStateResponse? interview = null;
         var currentInterviewNode = CurrentInterviewNode(attempt, definition);
+        var openingCompleted = attempt.OpeningCompleted ?? true;
+        if (definition.InitialInterview.Topics.Count > 0 && currentInterviewNode?.IsTerminal != true)
+            openingCompleted = false;
         if (currentInterviewNode is not null)
         {
             interview = new CcsInterviewStateResponse
@@ -443,7 +446,7 @@ public sealed class CcsStore
                 CurrentNodeId = currentInterviewNode.Id,
                 CurrentNode = currentInterviewNode,
                 VisitedChoiceIds = attempt.InterviewChoiceIds,
-                Completed = attempt.OpeningCompleted ?? false
+                Completed = openingCompleted
             };
         }
         return new CcsAttemptResponse
@@ -452,7 +455,7 @@ public sealed class CcsStore
             CaseTitle = completed ? definition.Title : $"CCS Case {attempt.CaseExternalId}",
             Mode = attempt.Mode, State = attempt.State, Revision = attempt.Revision,
             SimulatedMinute = attempt.SimulatedMinute, SimulatedStartUtc = definition.InitialChart.SimulatedStartUtc,
-            OpeningCompleted = attempt.OpeningCompleted ?? true, Location = attempt.Location,
+            OpeningCompleted = openingCompleted, Location = attempt.Location,
             DeadlineUtc = attempt.DeadlineUtc, HardDeadlineUtc = attempt.HardDeadlineUtc,
             FinalOrdersDeadlineUtc = attempt.FinalOrdersDeadlineUtc,
             CreatedUtc = attempt.CreatedUtc, RealTimeMinutes = definition.RealTimeMinutes,
@@ -482,12 +485,18 @@ public sealed class CcsStore
 
     public static void ApplyDialogueChoice(CcsAttempt attempt, CcsCaseRevision definition, string choiceId, DateTime now)
     {
-        if (attempt.OpeningCompleted == true) throw new InvalidOperationException("The initial interview is already complete.");
         if (definition.InitialInterview.Topics.Count > 0)
         {
+            if (attempt.OpeningCompleted == true
+                && attempt.InterviewNodeId.Equals("complete", StringComparison.OrdinalIgnoreCase))
+                throw new InvalidOperationException("The initial interview is already complete.");
+            // Attempts that passed through the legacy classic opening can have
+            // this flag set before any graphical topic was completed.
+            attempt.OpeningCompleted = false;
             ApplyTopicChoice(attempt, definition.InitialInterview, choiceId, now);
             return;
         }
+        if (attempt.OpeningCompleted == true) throw new InvalidOperationException("The initial interview is already complete.");
         var interview = EffectiveInterview(definition);
         var node = interview.Nodes.FirstOrDefault(value =>
             value.Id.Equals(attempt.InterviewNodeId, StringComparison.OrdinalIgnoreCase))