#723 Let LimboPlayer task manager decide which message key to use

- Pass boolean (is registered) value and determine internally which message key (email registration vs. regular) to use in the message task

src/main/java/fr/xephi/authme/task/LimboPlayerTaskManager.java

@@ -44,10 +44,12 @@ public class LimboPlayerTaskManager {
      * Registers a {@link MessageTask} for the given player name.
      *
      * @param name the name of the player to schedule a repeating message task for
-     * @param key the key of the message to display
+     * @param isRegistered whether the name is registered or not
+     *                     (false shows "please register", true shows "please log in")
      */
-    public void registerMessageTask(String name, MessageKey key) {
+    public void registerMessageTask(String name, boolean isRegistered) {
         final int interval = settings.getProperty(RegistrationSettings.MESSAGE_INTERVAL);
+        final MessageKey key = getMessageKey(isRegistered);
         if (interval > 0) {
             final LimboPlayer limboPlayer = limboCache.getLimboPlayer(name);
             if (limboPlayer == null) {
@@ -81,6 +83,22 @@ public class LimboPlayerTaskManager {
         }
     }
 
+    /**
+     * Returns the appropriate message key according to the registration status and settings.
+     *
+     * @param isRegistered whether or not the username is registered
+     * @return the message key to display to the user
+     */
+    private MessageKey getMessageKey(boolean isRegistered) {
+        if (isRegistered) {
+            return MessageKey.LOGIN_MESSAGE;
+        } else {
+            return settings.getProperty(RegistrationSettings.USE_EMAIL_REGISTRATION)
+                ? MessageKey.REGISTER_EMAIL_MESSAGE
+                : MessageKey.REGISTER_MESSAGE;
+        }
+    }
+
     /**
      * Null-safe method to cancel a potentially existing task.
      *