feat: the assistant's talk is kept in the database per user and the model sees a trimmed window of it; clear is a broom; the ball steps aside for the chat and comes back where the chat was

internal/server/ai_test.go

@@ -130,7 +130,7 @@ func TestAIChatNeedsUserOn(t *testing.T) {
 	_ = s.db.SetConfig(cfgAIType, "openai")
 	_ = s.db.SetConfig(cfgAIURL, srv.URL)
 	post := func() *httptest.ResponseRecorder {
-		req := httptest.NewRequest(http.MethodPost, "/api/panel/ai/chat", strings.NewReader(`{"messages":[{"role":"user","content":"hi"}],"context":"x"}`))
+		req := httptest.NewRequest(http.MethodPost, "/api/panel/ai/chat", strings.NewReader(`{"message":"hi","context":"x"}`))
 		req.AddCookie(c)
 		w := httptest.NewRecorder()
 		s.Handler().ServeHTTP(w, req)
@@ -146,6 +146,10 @@ func TestAIChatNeedsUserOn(t *testing.T) {
 	if w.Code != 200 || string(b) != "ok" {
 		t.Fatalf("on: %d %q", w.Code, b)
 	}
+	// The talk is kept: the question and the answer.
+	if h := s.aiHistory(a.ID, 10); len(h) != 2 || h[0].Content != "hi" || h[1].Content != "ok" {
+		t.Fatalf("history: %+v", h)
+	}
 }
 
 func TestVersionAtLeast(t *testing.T) {
@@ -158,3 +162,41 @@ func TestVersionAtLeast(t *testing.T) {
 		}
 	}
 }
+
+// The window the model sees: newest first within the budget, old results
+// and answers cut down, results as the user's words, same roles merged.
+func TestAIWindow(t *testing.T) {
+	big := strings.Repeat("x", 5000)
+	rows := []aiMsg{
+		{Role: "user", Content: "старое"},
+		{Role: "assistant", Content: big},
+		{Role: "result", Content: big},
+		{Role: "user", Content: "дальше"},
+		{Role: "assistant", Content: "ок"},
+		{Role: "result", Content: "вывод"},
+	}
+	w := aiWindow(rows, 100000)
+	if len(w) != 5 || w[0].Role != "user" || w[len(w)-1].Role != "user" {
+		t.Fatalf("roles: %+v", w)
+	}
+	if len(w[1].Content) > 3200 || len(w[2].Content) > 1700+len("дальше")+40 {
+		t.Fatalf("old not cut: %d %d", len(w[1].Content), len(w[2].Content))
+	}
+	if !strings.Contains(w[4].Content, "вывод") || !strings.HasPrefix(w[4].Content, "Результат") {
+		t.Fatalf("last result: %q", w[4].Content)
+	}
+	// A small budget keeps the newest, starting with the user.
+	w = aiWindow(rows, 60)
+	if len(w) == 0 || w[0].Role != "user" || !strings.Contains(w[len(w)-1].Content, "вывод") {
+		t.Fatalf("small: %+v", w)
+	}
+}
+
+func TestStripThink(t *testing.T) {
+	if got := stripThink("::думаю::\nхм\n::ответ::\n391"); got != "391" {
+		t.Fatalf("%q", got)
+	}
+	if got := stripThink("просто"); got != "просто" {
+		t.Fatalf("%q", got)
+	}
+}