Refactoring

* refactoring
* fixes
* messages
* new interface

SeniorAssistant/Data/SeniorDataContext.cs

@@ -1,7 +1,10 @@
-using LinqToDB;
+using System;
+using System.Linq;
+using LinqToDB;
 using LinqToDB.Data;
 using LinqToDB.DataProvider;
 using SeniorAssistant.Models;
+using SeniorAssistant.Models.Data;
 using SeniorAssistant.Models.Users;
 
 namespace SeniorAssistant.Data
@@ -20,5 +23,37 @@ namespace SeniorAssistant.Data
         public ITable<Patient> Patients => GetTable<Patient>();
         public ITable<Notification> Notifications => GetTable<Notification>();
         public ITable<Message> Messages => GetTable<Message>();
+
+        public T[] GetLastMessages<T>(ITable<T> table, string receiver, ref int numNotSeen, int max = 10)
+            where T : IHasMessage
+        {
+            var notSeen = (from t in table
+                           where t.Receiver.Equals(receiver) && t.Seen == default
+                           orderby t.Time descending
+                           select t).Take(max).ToArray();
+            var messages = new T[max];
+            numNotSeen = notSeen.Length;
+
+            int i;
+            for (i = 0; i < numNotSeen; i++)
+            {
+                messages[i] = notSeen[i];
+            }
+
+            if (numNotSeen < max)
+            {
+                var messSeen = (from t in table
+                                where t.Receiver.Equals(receiver) && t.Seen != default
+                                orderby t.Time descending
+                                select t).Take(max - numNotSeen).ToArray();
+
+                foreach (var m in messSeen)
+                {
+                    messages[i] = m;
+                    i++;
+                }
+            }
+            return messages;
+        }
     }
 }