Merge branch '12-' into 'master'

Resolve "Реализовать уведомление о смене статуса статьи"

Closes #12

See merge request romanov73/ng-tracker!13

src/main/java/ru/ulstu/paper/service/PaperService.java

@@ -7,6 +7,8 @@ import ru.ulstu.paper.model.Paper;
 import ru.ulstu.paper.model.PaperDto;
 import ru.ulstu.paper.model.PaperStatusDto;
 import ru.ulstu.paper.repository.PaperRepository;
+import ru.ulstu.user.model.UserDto;
+import ru.ulstu.user.service.MailService;
 
 import java.io.IOException;
 import java.util.Arrays;
@@ -20,11 +22,14 @@ public class PaperService {
 
     private final PaperRepository paperRepository;
     private final FileService fileService;
+    public final MailService mailService;
+
 
     public PaperService(PaperRepository paperRepository,
-                        FileService fileService) {
+                        FileService fileService, MailService mailService) {
         this.paperRepository = paperRepository;
         this.fileService = fileService;
+        this.mailService = mailService;
     }
 
     public List<PaperDto> findAll() {
@@ -62,6 +67,9 @@ public class PaperService {
     @Transactional
     public Integer update(PaperDto paperDto) throws IOException {
         Paper paper = paperRepository.findOne(paperDto.getId());
+        if(paper != null && paper.getStatus() != paperDto.getStatus()){
+            sendMessageAboutStatusChange(paper.getStatus(),paperDto);
+        }
         if (paperDto.getTmpFileName() != null && paper.getFileData() != null) {
             fileService.deleteFile(paper.getFileData());
         }
@@ -80,4 +88,12 @@ public class PaperService {
     public List<PaperStatusDto> getPaperStatuses() {
         return convert(Arrays.asList(Paper.PaperStatus.values()), status ->new PaperStatusDto(status));
     }
+
+    private void sendMessageAboutStatusChange(Paper.PaperStatus oldStatus, PaperDto paper){
+        for (UserDto user: paper.getAuthors()) {
+            mailService.sendEmail(user.getEmail(), "Обновление статуса статьи",
+                    "Статус статьи " + paper.getTitle() + " сменился с " + oldStatus.getName()
+                            + " на " + paper.getStatus().getName());
+        }
+    }
 }