fix(assistant): #91 le SSE renvoie le modele reellement utilise (tag fournisseur - modele complet)

tests/test_bookslm.py

@@ -967,3 +967,60 @@ class TestBooksLMAgentEndpoint:
         assert executed.get("ran") is True
         assert "C'est fait." in resp2.text
         assert "event: message" in resp2.text
+
+    def test_agent_message_reports_effective_model(self, bookslm_client, monkeypatch):
+        """The SSE payload carries the model really used, not the raw request.
+
+        The client may leave `model` empty (provider default) — reporting it
+        verbatim left the "provider · model" tag in the UI with the provider
+        only.
+        """
+        import re
+
+        import backend.bookslm_routes as routes
+        from backend.ai import PROVIDERS
+        from backend.ai_chat import LLMResponse
+
+        async def fake_chat_completion(messages, **kwargs):
+            return LLMResponse(content="Bonjour.")
+
+        monkeypatch.setattr(routes, "chat_completion", fake_chat_completion)
+        monkeypatch.setattr(routes, "_resolve_provider_name", lambda requested: "openrouter")
+
+        token, _ = _login_bookslm(bookslm_client)
+        resp = bookslm_client.post(
+            "/api/ai/bookslm/agent",
+            json={"vault": "TestVault", "directory": "", "message": "salut", "mode": "directory"},
+            headers={"Authorization": f"Bearer {token}"},
+        )
+        assert resp.status_code == 200
+        match = re.search(r"event: message\ndata: (.*)", resp.text)
+        assert match, resp.text
+        data = json.loads(match.group(1))
+        assert data["provider"] == "openrouter"
+        expected = PROVIDERS.get("openrouter", {}).get("model", "") or ""
+        assert data["model"] == expected, data
+        assert data["model"], "provider default model must not be reported empty"
+
+
+class TestEffectiveModel:
+    """Unit tests for the provider/model tag payload helper."""
+
+    def test_requested_model_wins(self):
+        from backend.bookslm_routes import _effective_model
+
+        assert _effective_model("openrouter", "openai/gpt-4o-mini") == "openai/gpt-4o-mini"
+
+    def test_falls_back_to_provider_default(self):
+        from backend.ai import PROVIDERS
+        from backend.bookslm_routes import _effective_model
+
+        default = PROVIDERS.get("openrouter", {}).get("model", "")
+        assert _effective_model("openrouter", None) == default
+        assert _effective_model("openrouter", "") == default
+
+    def test_unknown_provider_or_missing_provider_is_empty(self):
+        from backend.bookslm_routes import _effective_model
+
+        assert _effective_model("nope-not-a-provider", None) == ""
+        assert _effective_model(None, None) == ""