"""message.complete names a final that reuses a response the turn already delivered.

The housekeeping-tool fallback (turn_empty_response, ``fallback_prior_turn_content``) ends a
turn on the answer the model streamed BEFORE its tool call. The renderer bounds "the current
response" at the bubble's last tool row, so without an identity it appended that answer again:
the same reply twice in one bubble, nothing between the copies when the tool is silent
(``todo_list``).
"""

import contextlib
from types import SimpleNamespace

import tui_gateway.server as srv


def _payload(monkeypatch, result):
    monkeypatch.setattr(srv, "_get_usage", lambda _agent: {})
    monkeypatch.setattr(srv, "render_message", lambda _text, _cols: None)
    monkeypatch.setattr(srv, "_clear_inflight_turn", lambda _session: None)
    agent = SimpleNamespace(_session_title_hint="Scratch")
    session = {"pending_title": None, "session_key": "k", "history_lock": contextlib.nullcontext(), "agent": agent}
    st = SimpleNamespace(
        result=result, agent=agent, terminal_callback=None, receipt_committed=True, receipt_attempted=False,
        marker_key="", error_retained=False, error_detail="", prompt_text="ping",
    )
    payload, _, _ = srv._complete_turn_payload(session, st, None, 80)
    return payload


def test_reused_final_is_named_on_the_wire(monkeypatch):
    payload = _payload(monkeypatch, {"final_response": "Here is the answer.", "response_previewed": True,
                                     "response_reused": True})
    assert payload["response_reused"] is True
    assert srv._event_frame("message.complete", "sid", payload)["params"]["payload"]["response_reused"] is True