Fix timestamps on DatabaseActivityPage preventing pagination

Author: jvyden

Refresh.Database/Models/Activity/DatabaseActivityGroup.cs

@@ -20,4 +20,17 @@ internal void Cleanup()
 
         this.UserChildren = null;
     }
+    
+    public void TraverseChildrenForEventsRecursively(Action<Event> callback)
+    {
+        foreach (Event @event in this.Events)
+        {
+            callback(@event);
+        }
+
+        foreach (DatabaseActivityGroup group in this.Children)
+        {
+            group.TraverseChildrenForEventsRecursively(callback);
+        }
+    }
 }

Refresh.Database/Models/Activity/DatabaseActivityPage.cs

@@ -15,12 +15,24 @@ internal DatabaseActivityPage(GameDatabaseContext database, IReadOnlyCollection<
         this.GenerateGroups(events);
 
         this.Cleanup();
-
-        if (this.EventGroups.Count > 0)
+        
+        this.Start = DateTimeOffset.MaxValue;
+        this.End = DateTimeOffset.MinValue;
+        foreach (DatabaseActivityGroup group in this.EventGroups)
         {
-            this.Start = DateTimeOffset.FromUnixTimeMilliseconds(parameters.Timestamp);
-            this.End = DateTimeOffset.FromUnixTimeMilliseconds(parameters.EndTimestamp);
+            group.TraverseChildrenForEventsRecursively((e) =>
+            {
+                if (e.Timestamp > this.End)
+                    this.End = e.Timestamp;
+
+                if (e.Timestamp < this.Start)
+                    this.Start = e.Timestamp;
+            });
         }
+
+        // go back 1 week by default to look for next page
+        if(this.End != DateTimeOffset.MinValue)
+            this.End = this.End.Subtract(TimeSpan.FromDays(7));
     }
 
     public DateTimeOffset Start;