refactor: use DTOs instead of manual maps in user responses

internal/handlers/auth_handler.go

@@ -151,22 +151,8 @@ func (h *AuthHandler) Register(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	userData := map[string]any{
-		"id":             result.User.ID,
-		"username":       result.User.Username,
-		"email":          result.User.Email,
-		"email_verified": result.User.EmailVerified,
-		"created_at":     result.User.CreatedAt,
-		"updated_at":     result.User.UpdatedAt,
-		"deleted_at":     result.User.DeletedAt,
-	}
-
-	responseData := map[string]any{
-		"user":              userData,
-		"verification_sent": result.VerificationSent,
-	}
-
-	SendCreatedResponse(w, "Registration successful. Check your email to confirm your account.", responseData)
+	responseDTO := dto.ToRegistrationResponseDTO(result.User, result.VerificationSent)
+	SendCreatedResponse(w, "Registration successful. Check your email to confirm your account.", responseDTO)
 }
 
 // @Summary Confirm email address
@@ -192,9 +178,7 @@ func (h *AuthHandler) ConfirmEmail(w http.ResponseWriter, r *http.Request) {
 	}
 
 	userDTO := dto.ToUserDTO(user)
-	SendSuccessResponse(w, "Email confirmed successfully", map[string]any{
-		"user": userDTO,
-	})
+	SendSuccessResponse(w, "Email confirmed successfully", userDTO)
 }
 
 // @Summary Resend verification email
@@ -397,9 +381,7 @@ func (h *AuthHandler) UpdateEmail(w http.ResponseWriter, r *http.Request) {
 	}
 
 	userDTO := dto.ToUserDTO(user)
-	SendSuccessResponse(w, "Email updated. Check your inbox to confirm the new address.", map[string]any{
-		"user": userDTO,
-	})
+	SendSuccessResponse(w, "Email updated. Check your inbox to confirm the new address.", userDTO)
 }
 
 // @Summary Update username
@@ -445,9 +427,7 @@ func (h *AuthHandler) UpdateUsername(w http.ResponseWriter, r *http.Request) {
 	}
 
 	userDTO := dto.ToUserDTO(user)
-	SendSuccessResponse(w, "Username updated successfully.", map[string]any{
-		"user": userDTO,
-	})
+	SendSuccessResponse(w, "Username updated successfully.", userDTO)
 }
 
 // @Summary Update password
@@ -498,9 +478,7 @@ func (h *AuthHandler) UpdatePassword(w http.ResponseWriter, r *http.Request) {
 	}
 
 	userDTO := dto.ToUserDTO(user)
-	SendSuccessResponse(w, "Password updated successfully.", map[string]any{
-		"user": userDTO,
-	})
+	SendSuccessResponse(w, "Password updated successfully.", userDTO)
 }
 
 // @Summary Request account deletion
@@ -565,18 +543,20 @@ func (h *AuthHandler) ConfirmAccountDeletion(w http.ResponseWriter, r *http.Requ
 		case errors.Is(err, services.ErrEmailSenderUnavailable):
 			SendErrorResponse(w, "Account deletion isn't available right now because email delivery is disabled.", http.StatusServiceUnavailable)
 		case errors.Is(err, services.ErrDeletionEmailFailed):
-			SendSuccessResponse(w, "Your account has been deleted, but we couldn't send the confirmation email.", map[string]any{
-				"posts_deleted": req.DeletePosts,
-			})
+			responseDTO := dto.AccountDeletionResponseDTO{
+				PostsDeleted: req.DeletePosts,
+			}
+			SendSuccessResponse(w, "Your account has been deleted, but we couldn't send the confirmation email.", responseDTO)
 		default:
 			SendErrorResponse(w, "We couldn't confirm the deletion right now.", http.StatusInternalServerError)
 		}
 		return
 	}
 
-	SendSuccessResponse(w, "Your account has been deleted.", map[string]any{
-		"posts_deleted": req.DeletePosts,
-	})
+	responseDTO := dto.AccountDeletionResponseDTO{
+		PostsDeleted: req.DeletePosts,
+	}
+	SendSuccessResponse(w, "Your account has been deleted.", responseDTO)
 }
 
 // @Summary Logout user

internal/handlers/post_handler.go

@@ -64,12 +64,13 @@ func (h *PostHandler) GetPosts(w http.ResponseWriter, r *http.Request) {
 	}
 
 	postDTOs := dto.ToPostDTOs(posts)
-	SendSuccessResponse(w, "Posts retrieved successfully", map[string]any{
-		"posts":  postDTOs,
-		"count":  len(postDTOs),
-		"limit":  limit,
-		"offset": offset,
-	})
+	responseDTO := dto.PostListDTO{
+		Posts:  postDTOs,
+		Count:  len(postDTOs),
+		Limit:  limit,
+		Offset: offset,
+	}
+	SendSuccessResponse(w, "Posts retrieved successfully", responseDTO)
 }
 
 // @Summary Get a single post
@@ -230,13 +231,14 @@ func (h *PostHandler) SearchPosts(w http.ResponseWriter, r *http.Request) {
 	}
 
 	postDTOs := dto.ToPostDTOs(posts)
-	SendSuccessResponse(w, "Search results retrieved successfully", map[string]any{
-		"posts":  postDTOs,
-		"count":  len(postDTOs),
-		"query":  query,
-		"limit":  limit,
-		"offset": offset,
-	})
+	responseDTO := dto.SearchPostListDTO{
+		Posts:  postDTOs,
+		Count:  len(postDTOs),
+		Query:  query,
+		Limit:  limit,
+		Offset: offset,
+	}
+	SendSuccessResponse(w, "Search results retrieved successfully", responseDTO)
 }
 
 // @Summary Update a post

internal/handlers/user_handler.go

@@ -47,13 +47,13 @@ func (h *UserHandler) GetUsers(w http.ResponseWriter, r *http.Request) {
 	}
 
 	userDTOs := dto.ToSanitizedUserDTOs(users)
-
-	SendSuccessResponse(w, "Users retrieved successfully", map[string]any{
-		"users":  userDTOs,
-		"count":  len(userDTOs),
-		"limit":  limit,
-		"offset": offset,
-	})
+	responseDTO := dto.UserListDTO{
+		Users:  userDTOs,
+		Count:  len(userDTOs),
+		Limit:  limit,
+		Offset: offset,
+	}
+	SendSuccessResponse(w, "Users retrieved successfully", responseDTO)
 }
 
 // @Summary Get user
@@ -132,10 +132,8 @@ func (h *UserHandler) CreateUser(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	SendCreatedResponse(w, "User created successfully. Verification email sent.", map[string]any{
-		"user":              result.User,
-		"verification_sent": result.VerificationSent,
-	})
+	responseDTO := dto.ToRegistrationResponseDTO(result.User, result.VerificationSent)
+	SendCreatedResponse(w, "User created successfully. Verification email sent.", responseDTO)
 }
 
 // @Summary Get user posts
@@ -167,12 +165,13 @@ func (h *UserHandler) GetUserPosts(w http.ResponseWriter, r *http.Request) {
 	}
 
 	postDTOs := dto.ToPostDTOs(posts)
-	SendSuccessResponse(w, "User posts retrieved successfully", map[string]any{
-		"posts":  postDTOs,
-		"count":  len(postDTOs),
-		"limit":  limit,
-		"offset": offset,
-	})
+	responseDTO := dto.PostListDTO{
+		Posts:  postDTOs,
+		Count:  len(postDTOs),
+		Limit:  limit,
+		Offset: offset,
+	}
+	SendSuccessResponse(w, "User posts retrieved successfully", responseDTO)
 }
 
 func (h *UserHandler) MountRoutes(r chi.Router, config RouteModuleConfig) {

internal/handlers/vote_handler.go

@@ -213,22 +213,26 @@ func (h *VoteHandler) GetUserVote(w http.ResponseWriter, r *http.Request) {
 	vote, err := h.voteService.GetUserVote(userID, postID, ipAddress, userAgent)
 	if err != nil {
 		if err.Error() == "record not found" {
-			SendSuccessResponse(w, "No vote found", map[string]any{
-				"has_vote":     false,
-				"vote":         nil,
-				"is_anonymous": false,
-			})
+			responseDTO := dto.VoteResponseDTO{
+				HasVote:     false,
+				Vote:        nil,
+				IsAnonymous: false,
+			}
+			SendSuccessResponse(w, "No vote found", responseDTO)
 			return
 		}
 		SendErrorResponse(w, "Internal server error", http.StatusInternalServerError)
 		return
 	}
 
-	SendSuccessResponse(w, "Vote retrieved successfully", map[string]any{
-		"has_vote":     true,
-		"vote":         vote,
-		"is_anonymous": false,
-	})
+	voteDTO := dto.ToVoteDTO(vote)
+	isAnonymous := vote.UserID == nil
+	responseDTO := dto.VoteResponseDTO{
+		HasVote:     true,
+		Vote:        &voteDTO,
+		IsAnonymous: isAnonymous,
+	}
+	SendSuccessResponse(w, "Vote retrieved successfully", responseDTO)
 }
 
 // @Summary Get post votes
@@ -263,15 +267,12 @@ func (h *VoteHandler) GetPostVotes(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	allVotes := make([]any, 0, len(votes))
-	for _, vote := range votes {
-		allVotes = append(allVotes, vote)
+	voteDTOs := dto.ToVoteDTOs(votes)
+	responseDTO := dto.VoteListDTO{
+		Votes: voteDTOs,
+		Count: len(voteDTOs),
 	}
-
-	SendSuccessResponse(w, "Votes retrieved successfully", map[string]any{
-		"votes": allVotes,
-		"count": len(allVotes),
-	})
+	SendSuccessResponse(w, "Votes retrieved successfully", responseDTO)
 }
 
 func (h *VoteHandler) MountRoutes(r chi.Router, config RouteModuleConfig) {