from __future__ import annotations

from beaver.engine.context import ContextBuildInput, ContextBuilder, RuntimeContext, SessionContext


def test_context_builder_injects_current_date_and_time() -> None:
    result = ContextBuilder().build_messages(
        ContextBuildInput(
            base_system_prompt="Follow user requests.",
            current_user_input="今天几号？",
            session_context=SessionContext(session_id="web:alpha", source="web", model="stub-model"),
            runtime_context=RuntimeContext(
                utc_datetime="2026-05-26T01:10:00+00:00",
                local_datetime="2026-05-26T09:10:00+08:00",
                timezone="Asia/Shanghai",
                utc_offset="+08:00",
            ),
        )
    )

    system_prompt = result.messages[0]["content"]
    assert "# Current Date and Time" in system_prompt
    assert "Current UTC time: 2026-05-26T01:10:00+00:00" in system_prompt
    assert "Current local time: 2026-05-26T09:10:00+08:00" in system_prompt
    assert "Local timezone: Asia/Shanghai" in system_prompt
    assert "Local UTC offset: +08:00" in system_prompt
    assert '"today", "tomorrow", "now", "this week", and "next month"' in system_prompt
    assert result.messages[-1] == {"role": "user", "content": "今天几号？"}