#119 add leader changed notification

src/main/java/ru/ulstu/grant/service/GrantNotificationService.java

@@ -18,10 +18,12 @@ public class GrantNotificationService {
     private final static String TEMPLATE_DEADLINE = "grantDeadlineNotification";
     private final static String TEMPLATE_CREATE = "grantCreateNotification";
     private final static String TEMPLATE_AUTHORS_CHANGED = "grantAuthorsChangeNotification";
+    private final static String TEMPLATE_LEADER_CHANGED = "grantLeaderChangeNotification";
 
     private final static String TITLE_DEADLINE = "Приближается дедлайн гранта: %s";
     private final static String TITLE_CREATE = "Создан грант: %s";
     private final static String TITLE_AUTHORS_CHANGED = "Изменился состав рабочей группы гранта: %s";
+    private final static String TITLE_LEADER_CHANGED = "Изменился руководитель гранта: %s";
 
     private final MailService mailService;
 
@@ -53,14 +55,18 @@ public class GrantNotificationService {
         sendForAllAuthors(variables, grant, TEMPLATE_CREATE, String.format(TITLE_CREATE, grant.getTitle()));
     }
 
-    public void authorsChangeNotification(Grant grant, List<User> oldAuthors) {
+    public void sendAuthorsChangeNotification(Grant grant, Set<User> oldAuthors) {
         Map<String, Object> variables = ImmutableMap.of("grant", grant, "oldAuthors", oldAuthors);
         sendForAllAuthors(variables, grant, TEMPLATE_AUTHORS_CHANGED, String.format(TITLE_AUTHORS_CHANGED, grant.getTitle()));
     }
 
+    public void sendLeaderChangeNotification(Grant grant, User oldLeader) {
+        Map<String, Object> variables = ImmutableMap.of("grant", grant, "oldLeader", oldLeader);
+        sendForAllAuthors(variables, grant, TEMPLATE_LEADER_CHANGED, String.format(TITLE_LEADER_CHANGED, grant.getTitle()));
+    }
     private void sendForAllAuthors(Map<String, Object> variables, Grant grant, String template, String title) {
         Set<User> allAuthors = grant.getAuthors();
-        allAuthors.add(grant.getLeader());
         allAuthors.forEach(author -> mailService.sendEmailFromTemplate(variables, author, template, title));
+        mailService.sendEmailFromTemplate(variables, grant.getLeader(), template, title);
     }
 }