Fix order by position

uhabits-core/src/main/java/org/isoron/uhabits/core/models/Habit.java

@@ -343,6 +343,16 @@ public class Habit
         return new HabitData(data);
     }
 
+    public Integer getPosition()
+    {
+        return data.position;
+    }
+
+    public void setPosition(int newPosition)
+    {
+        data.position = newPosition;
+    }
+
     public static class HabitData
     {
         @NonNull
@@ -370,6 +380,8 @@ public class Habit
         @Nullable
         public Reminder reminder;
 
+        public int position;
+
         public HabitData()
         {
             this.color = 8;
@@ -381,6 +393,7 @@ public class Habit
             this.targetType = AT_LEAST;
             this.targetValue = 100;
             this.unit = "";
+            this.position = 0;
         }
 
         public HabitData(@NonNull HabitData model)
@@ -395,6 +408,7 @@ public class Habit
             this.type = model.type;
             this.unit = model.unit;
             this.reminder = model.reminder;
+            this.position = model.position;
         }
 
         @Override
@@ -411,6 +425,7 @@ public class Habit
                 .append("type", type)
                 .append("unit", unit)
                 .append("reminder", reminder)
+                .append("position", position)
                 .toString();
         }
 
@@ -434,6 +449,7 @@ public class Habit
                 .append(frequency, habitData.frequency)
                 .append(unit, habitData.unit)
                 .append(reminder, habitData.reminder)
+                .append(position, habitData.position)
                 .isEquals();
         }
 
@@ -451,6 +467,7 @@ public class Habit
                 .append(type)
                 .append(unit)
                 .append(reminder)
+                .append(position)
                 .toHashCode();
         }
     }

uhabits-core/src/main/java/org/isoron/uhabits/core/models/memory/MemoryHabitList.java

@@ -139,10 +139,18 @@ public class MemoryHabitList extends HabitList
             Double s1 = h1.getScores().getTodayValue();
             Double s2 = h2.getScores().getTodayValue();
             if (s1.equals(s2)) return nameComparator.compare(h1, h2);
-            return s2.compareTo(s1);
+            else return s2.compareTo(s1);
         };
 
-        if (order == BY_POSITION) return null;
+        Comparator<Habit> positionComparator = (h1, h2) ->
+        {
+            Integer p1 = h1.getPosition();
+            Integer p2 = h2.getPosition();
+            if (p1.equals(p2)) return nameComparator.compare(h1, h2);
+            else return p1.compareTo(p2);
+        };
+
+        if (order == BY_POSITION) return positionComparator;
         if (order == BY_NAME) return nameComparator;
         if (order == BY_COLOR) return colorComparator;
         if (order == BY_SCORE) return scoreComparator;

uhabits-core/src/main/java/org/isoron/uhabits/core/models/sqlite/SQLiteHabitList.java

@@ -85,11 +85,11 @@ public class SQLiteHabitList extends HabitList
     public synchronized void add(@NonNull Habit habit)
     {
         loadRecords();
+        habit.setPosition(size());
         list.add(habit);
 
         HabitRecord record = new HabitRecord();
         record.copyFrom(habit);
-        record.position = size();
         repository.save(record);
         rebuildOrder();
 
@@ -173,8 +173,8 @@ public class SQLiteHabitList extends HabitList
             ((SQLiteRepetitionList) habit.getRepetitions()).removeAll();
             repository.remove(record);
         });
-        rebuildOrder();
 
+        rebuildOrder();
         getObservable().notifyListeners();
     }
 
@@ -213,7 +213,7 @@ public class SQLiteHabitList extends HabitList
         {
             repository.execSQL("update habits set position = position - 1 " +
                                "where position > ? and position <= ?",
-                fromPos, toPos);
+                               fromPos, toPos);
         }
 
         fromRecord.position = toPos;

uhabits-core/src/main/java/org/isoron/uhabits/core/models/sqlite/records/HabitRecord.java

@@ -91,6 +91,7 @@ public class HabitRecord
         this.targetType = model.getTargetType();
         this.targetValue = model.getTargetValue();
         this.unit = model.getUnit();
+        this.position = model.getPosition();
 
         Frequency freq = model.getFrequency();
         this.freqNum = freq.getNumerator();
@@ -120,6 +121,7 @@ public class HabitRecord
         habit.setTargetType(this.targetType);
         habit.setTargetValue(this.targetValue);
         habit.setUnit(this.unit);
+        habit.setPosition(this.position);
 
         if (reminderHour != null && reminderMin != null)
         {