fix: resolve nestif issues by extracting helper methods

internal/handlers/api.go

@@ -303,12 +303,24 @@ func (s *Handlers) handlePrivmsg(w http.ResponseWriter, r *http.Request, uid, ni
 	content := strings.Join(lines, "\n")
 
 	if strings.HasPrefix(to, "#") {
-		// Channel message.
+		s.sendChannelMessage(w, r, uid, nick, to, content)
+
+		return
+	}
+
+	// DM.
+	s.sendDirectMessage(w, r, uid, nick, to, content)
+}
+
+func (s *Handlers) sendChannelMessage(
+	w http.ResponseWriter, r *http.Request,
+	uid, nick, channel, content string,
+) {
 	var chID string
 
 	//nolint:gosec // G701: parameterized query, not injection
 	err := s.params.Database.GetDB().QueryRowContext(r.Context(),
-			"SELECT id FROM channels WHERE name = ?", to).Scan(&chID)
+		"SELECT id FROM channels WHERE name = ?", channel).Scan(&chID)
 	if err != nil {
 		s.respondJSON(w, r, map[string]string{"error": "channel not found"}, http.StatusNotFound)
 
@@ -324,8 +336,12 @@ func (s *Handlers) handlePrivmsg(w http.ResponseWriter, r *http.Request, uid, ni
 	}
 
 	s.respondJSON(w, r, map[string]any{"id": msgID, "status": "sent"}, http.StatusCreated)
-	} else {
+}
-		// DM.
+
+func (s *Handlers) sendDirectMessage(
+	w http.ResponseWriter, r *http.Request,
+	uid, nick, to, content string,
+) {
 	targetUser, err := s.params.Database.GetUserByNick(r.Context(), to)
 	if err != nil {
 		s.respondJSON(w, r, map[string]string{"error": "user not found"}, http.StatusNotFound)
@@ -343,7 +359,6 @@ func (s *Handlers) handlePrivmsg(w http.ResponseWriter, r *http.Request, uid, ni
 
 	s.respondJSON(w, r, map[string]any{"id": msgID, "status": "sent"}, http.StatusCreated)
 }
-}
 
 func (s *Handlers) handleJoin(w http.ResponseWriter, r *http.Request, uid, to string) {
 	if to == "" {
@@ -495,12 +510,24 @@ func (s *Handlers) HandleGetHistory() http.HandlerFunc {
 		}
 
 		if strings.HasPrefix(target, "#") {
-			// Channel history — look up channel by name to get its ID for target matching.
+			s.getChannelHistory(w, r, target, beforeTS, limit)
+
+			return
+		}
+
+		s.getDMHistory(w, r, uid, target, beforeTS, limit)
+	}
+}
+
+func (s *Handlers) getChannelHistory(
+	w http.ResponseWriter, r *http.Request,
+	channel, beforeTS string, limit int,
+) {
 	var chID string
 
 	//nolint:gosec // G701: parameterized query, not injection
 	err := s.params.Database.GetDB().QueryRowContext(r.Context(),
-				"SELECT id FROM channels WHERE name = ?", target).Scan(&chID)
+		"SELECT id FROM channels WHERE name = ?", channel).Scan(&chID)
 	if err != nil {
 		s.respondJSON(w, r, map[string]string{"error": "channel not found"}, http.StatusNotFound)
 
@@ -516,8 +543,12 @@ func (s *Handlers) HandleGetHistory() http.HandlerFunc {
 	}
 
 	s.respondJSON(w, r, msgs, http.StatusOK)
-		} else {
+}
-			// DM history.
+
+func (s *Handlers) getDMHistory(
+	w http.ResponseWriter, r *http.Request,
+	uid, target, beforeTS string, limit int,
+) {
 	targetUser, err := s.params.Database.GetUserByNick(r.Context(), target)
 	if err != nil {
 		s.respondJSON(w, r, map[string]string{"error": "user not found"}, http.StatusNotFound)
@@ -535,8 +566,6 @@ func (s *Handlers) HandleGetHistory() http.HandlerFunc {
 
 	s.respondJSON(w, r, msgs, http.StatusOK)
 }
-	}
-}
 
 // HandleServerInfo returns server metadata (MOTD, name).
 func (s *Handlers) HandleServerInfo() http.HandlerFunc {