Add Delete Upvote Endpoint

Author: Cgtycolak

backend/src/main/java/com/group1/cuisines/controllers/RecipeController.java

@@ -98,5 +98,19 @@ public ResponseEntity<?> getBookmarks(@PathVariable Integer recipeId) {
         return ResponseEntity.ok().body(whoBookmarked);
     }
 
+    @DeleteMapping("/recipes/{recipeId}/comments/{commentId}/upvote")
+    public ResponseEntity<?> deleteUpvote(@PathVariable Integer commentId) {
+        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
+        if (authentication == null || authentication.getPrincipal().equals("anonymousUser")) {
+            return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body("Authentication required.");
+        }
+        String username = authentication.getName();
+        boolean success = recipeService.deleteUpvote(commentId, username);
+        if (success) {
+            return ResponseEntity.ok().body("Upvote removed successfully.");
+        } else {
+            return ResponseEntity.badRequest().body("Failed to remove upvote.");
+        }
+    }
 
 }

backend/src/main/java/com/group1/cuisines/repositories/UpvoteRepository.java

@@ -4,6 +4,9 @@
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
+import java.util.Optional;
+
 @Repository
-public interface UpvoteRepository extends JpaRepository<Upvote,Integer> {
+public interface UpvoteRepository extends JpaRepository<Upvote, Integer> {
+    Optional<Upvote> findByCommentIdAndUserId(Integer commentId, Integer userId);
 }

backend/src/main/java/com/group1/cuisines/services/RecipeService.java

@@ -29,6 +29,8 @@ public class RecipeService {
     private RatingRepository ratingRepository;
     @Autowired
     private BookmarkRepository bookmarkRepository;
+    @Autowired
+    private UpvoteRepository upvoteRepository;
 
     @Transactional
     public RecipeDetailDto createRecipe(NewRecipeDto newRecipe, String username) throws Exception {
@@ -145,4 +147,19 @@ public List<User> getWhoBookmarked(Integer recipeId) {
         return bookmarkRepository.findByRecipeId(recipeId).stream().map(Bookmark::getUser).toList();
     }
 
+    @Transactional
+    public boolean deleteUpvote(Integer commentId, String username) {
+        User user = userRepository.findByUsername(username).orElse(null);
+        if (user == null) {
+            return false;
+        }
+        Optional<Upvote> upvote = upvoteRepository.findByCommentIdAndUserId(commentId, user.getId());
+        if (upvote.isPresent()) {
+            upvoteRepository.delete(upvote.get());
+            return true;
+        }
+        return false;
+    }
+
+
 }