Allow skipping registration PIN intervals on success

Closes #7517
Closes #7518

src/org/thoughtcrime/securesms/lock/RegistrationLockReminders.java

@@ -6,14 +6,22 @@ import android.support.annotation.NonNull;
 
 import org.thoughtcrime.securesms.util.TextSecurePreferences;
 
-import java.util.HashMap;
-import java.util.Map;
+import java.util.NavigableSet;
+import java.util.TreeSet;
 import java.util.concurrent.TimeUnit;
 
 public class RegistrationLockReminders {
 
-  public static final long INITIAL_INTERVAL = TimeUnit.HOURS.toMillis(6);
-  
+  private static final NavigableSet<Long> INTERVALS = new TreeSet<Long>() {{
+    add(TimeUnit.HOURS.toMillis(6));
+    add(TimeUnit.HOURS.toMillis(12));
+    add(TimeUnit.DAYS.toMillis(1));
+    add(TimeUnit.DAYS.toMillis(3));
+    add(TimeUnit.DAYS.toMillis(7));
+  }};
+
+  public static final long INITIAL_INTERVAL = INTERVALS.first();
+
   public static boolean needsReminder(@NonNull Context context) {
     if (!TextSecurePreferences.isRegistrationtLockEnabled(context)) return false;
 
@@ -24,20 +32,16 @@ public class RegistrationLockReminders {
   }
 
   public static void scheduleReminder(@NonNull Context context, boolean success) {
-    long lastReminderInterval = TextSecurePreferences.getRegistrationLockNextReminderInterval(context);
-    long nextReminderInterval;
+    Long nextReminderInterval;
 
     if (success) {
-      if      (lastReminderInterval <= TimeUnit.HOURS.toMillis(6))  nextReminderInterval = TimeUnit.HOURS.toMillis(12);
-      else if (lastReminderInterval <= TimeUnit.HOURS.toMillis(12)) nextReminderInterval = TimeUnit.DAYS.toMillis(1);
-      else if (lastReminderInterval <= TimeUnit.DAYS.toMillis(1))   nextReminderInterval = TimeUnit.DAYS.toMillis(3);
-      else if (lastReminderInterval <= TimeUnit.DAYS.toMillis(3))   nextReminderInterval = TimeUnit.DAYS.toMillis(7);
-      else                                                                  nextReminderInterval = TimeUnit.DAYS.toMillis(7);
+      long timeSinceLastReminder = System.currentTimeMillis() - TextSecurePreferences.getRegistrationLockLastReminderTime(context);
+      nextReminderInterval = INTERVALS.higher(timeSinceLastReminder);
+      if (nextReminderInterval == null) nextReminderInterval = INTERVALS.last();
     } else {
-      if      (lastReminderInterval >= TimeUnit.DAYS.toMillis(7)) nextReminderInterval = TimeUnit.DAYS.toMillis(3);
-      else if (lastReminderInterval >= TimeUnit.DAYS.toMillis(3)) nextReminderInterval = TimeUnit.DAYS.toMillis(1);
-      else if (lastReminderInterval >= TimeUnit.DAYS.toMillis(1)) nextReminderInterval = TimeUnit.HOURS.toMillis(12);
-      else                                                                nextReminderInterval = TimeUnit.HOURS.toMillis(6);
+      long lastReminderInterval = TextSecurePreferences.getRegistrationLockNextReminderInterval(context);
+      nextReminderInterval = INTERVALS.lower(lastReminderInterval);
+      if (nextReminderInterval == null) nextReminderInterval = INTERVALS.first();
     }
 
     TextSecurePreferences.setRegistrationLockLastReminderTime(context, System.currentTimeMillis());