feat: a new chat is named by the model in two or three words, asked aside; the machine's name gets its room in the chat's header

internal/server/ai.go

@@ -10,6 +10,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"log"
 	"net/http"
 	"strconv"
 	"strings"
@@ -537,8 +538,13 @@ func (s *Server) handleAIChat(w http.ResponseWriter, r *http.Request) {
 		in.Chat = s.aiNewChat(a.ID)
 	}
 	w.Header().Set("X-Chat-Id", strconv.FormatInt(in.Chat, 10))
+	fresh := in.Message != "" && len(s.aiHistoryOf(a.ID, in.Chat, 1)) == 0
 	s.aiAppendTo(a.ID, in.Chat, "result", in.Result)
 	s.aiAppendTo(a.ID, in.Chat, "user", in.Message)
+	if fresh {
+		// A new chat gets a short name from the model, aside.
+		go s.aiNameChat(a.ID, in.Chat, in.Message)
+	}
 	msgs := aiWindow(s.aiHistoryOf(a.ID, in.Chat, 60), 24000)
 	if len(in.Context) > 30000 {
 		in.Context = utf8Safe(in.Context[len(in.Context)-30000:])
@@ -598,6 +604,45 @@ func (s *Server) handleAIChat(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+// aiNameChat asks the model for a two-or-three-word name of the chat its
+// first question opened, and gives the chat that name.
+func (s *Server) aiNameChat(owner, chat int64, question string) {
+	ctx, cancel := context.WithTimeout(context.Background(), 90*time.Second)
+	defer cancel()
+	if r := []rune(question); len(r) > 600 {
+		question = string(r[:600])
+	}
+	var b strings.Builder
+	err := aiStream(ctx, s.aiConfig(), "Придумай короткое название чата по первому вопросу пользователя: 2-3 слова, по-русски, "+
+		"без кавычек и точки в конце. Ответь только названием.", []aiMsg{{Role: "user", Content: question}}, func(t string) { b.WriteString(t) })
+	if err != nil {
+		log.Printf("ai: naming chat %d: %v", chat, err)
+		return
+	}
+	if t := chatTitle(b.String()); t != "" {
+		_, _ = s.db.sql.Exec(`UPDATE ai_chats SET title = ? WHERE id = ? AND admin_id = ?`, t, chat, owner)
+	}
+}
+
+// chatTitle tidies what the model gave for a name: the first line, no
+// thinking, quotes or end mark, four words at most.
+func chatTitle(s string) string {
+	s = stripThink(s)
+	if i := strings.IndexByte(strings.TrimSpace(s), '\n'); i >= 0 {
+		s = strings.TrimSpace(s)[:i]
+	}
+	s = strings.Trim(strings.TrimSpace(s), "\"'«»„“”`*#.!:;")
+	w := strings.Fields(s)
+	if len(w) > 4 {
+		w = w[:4]
+	}
+	s = strings.Join(w, " ")
+	if r := []rune(s); len(r) > 40 {
+		s = string(r[:40])
+	}
+	return s
+}
+
 // GET /api/panel/ai/chats - the user's chats, newest first.
 func (s *Server) handleAIChats(w http.ResponseWriter, r *http.Request) {
 	a := s.currentAdmin(r)