Add action for randomizing habit history (dev mode)

uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/show/ShowHabitsMenu.java

@@ -24,6 +24,7 @@ import android.view.*;
 
 import org.isoron.androidbase.activities.*;
 import org.isoron.uhabits.*;
+import org.isoron.uhabits.core.preferences.Preferences;
 import org.isoron.uhabits.core.ui.screens.habits.show.*;
 
 import javax.inject.*;
@@ -35,13 +36,26 @@ public class ShowHabitsMenu extends BaseMenu
 {
     @NonNull
     private Lazy<ShowHabitMenuBehavior> behavior;
+    @NonNull
+    private final Preferences prefs;
 
     @Inject
     public ShowHabitsMenu(@NonNull BaseActivity activity,
-                          @NonNull Lazy<ShowHabitMenuBehavior> behavior)
+                          @NonNull Lazy<ShowHabitMenuBehavior> behavior,
+                          @NonNull Preferences prefs)
     {
         super(activity);
         this.behavior = behavior;
+        this.prefs = prefs;
+    }
+
+    @Override
+    public void onCreate(@NonNull Menu menu)
+    {
+        super.onCreate(menu);
+
+        if (prefs.isDeveloper())
+            menu.findItem(R.id.action_randomize).setVisible(true);
     }
 
     @Override
@@ -61,6 +75,10 @@ public class ShowHabitsMenu extends BaseMenu
                 behavior.get().onDeleteHabit();
                 return true;
 
+            case R.id.action_randomize:
+                behavior.get().onRandomize();
+                return true;
+
             default:
                 return false;
         }

uhabits-android/src/main/res/menu/show_habit.xml

@@ -37,4 +37,10 @@
         android:title="@string/edit"
         app:showAsAction="ifRoom"/>
 
+    <item
+        android:id="@+id/action_randomize"
+        android:title="Randomize"
+        android:visible="false"
+        app:showAsAction="never"/>
+
 </menu>

uhabits-core/src/main/java/org/isoron/uhabits/core/ui/screens/habits/show/ShowHabitMenuBehavior.java

@@ -25,12 +25,16 @@ import org.isoron.uhabits.core.commands.*;
 import org.isoron.uhabits.core.models.*;
 import org.isoron.uhabits.core.tasks.*;
 import org.isoron.uhabits.core.ui.callbacks.*;
+import org.isoron.uhabits.core.utils.*;
 
 import java.io.*;
 import java.util.*;
 
 import javax.inject.*;
 
+import static java.lang.Math.*;
+
+
 public class ShowHabitMenuBehavior
 {
     private HabitList habitList;
@@ -95,6 +99,27 @@ public class ShowHabitMenuBehavior
         });
     }
 
+    public void onRandomize()
+    {
+        Random random = new Random();
+        habit.getRepetitions().removeAll();
+        double strength = 50;
+
+        for (int i = 0; i < 365 * 5; i++)
+        {
+            if (i % 7 == 0) strength = max(0, min(100, strength + 10 * random.nextGaussian()));
+            if (random.nextInt(100) > strength) continue;
+
+            int value = 1;
+            if (habit.isNumerical())
+                value = (int) (1000 + 250 * random.nextGaussian() * strength / 100) * 1000;
+
+            habit.getRepetitions().add(new Repetition(DateUtils.getToday().minus(i), value));
+        }
+
+        habit.invalidateNewerThan(Timestamp.ZERO);
+    }
+
     public enum Message
     {
         COULD_NOT_EXPORT, HABIT_DELETED