"""Gateway must-deliver notes on the current user message.

The gateway relocates per-turn volatile facts OUT of the ephemeral system
prompt — auto-reset notes, the first-contact intro, voice-channel changes —
and stages them on ``agent._gateway_turn_context_notes``.
``build_turn_context`` consumes them once and delivers them through the same
api_content sidecar channel as plugin context (string content), or as an
appended text part on multimodal (list) content, where the string sidecar
cannot apply and the fact would otherwise silently drop.
"""

from __future__ import annotations

import types
from unittest.mock import patch

import pytest

from agent.turn_context import (
    append_notes_to_multimodal_content,
    build_turn_context,
    compose_user_api_content,
    consume_gateway_turn_context_notes,
)


class _FakeTodoStore:
    def has_items(self):
        return True


class _FakeGuardrails:
    def reset_for_turn(self):
        pass


class _FakeAgent:
    """Minimal stand-in covering only what the prologue touches
    (mirrors tests/agent/test_api_content_sidecar.py)."""

    def __init__(self):
        self.session_id = "sess-1"
        self.model = "test/model"
        self.provider = "openrouter"
        self.base_url = "https://openrouter.ai/api/v1"
        self.api_key = "sk-x"
        self.api_mode = "chat_completions"
        self.platform = "discord"
        self.quiet_mode = True
        self.max_iterations = 90
        self.tools = []
        self.valid_tool_names = set()
        self._skip_mcp_refresh = True
        self.compression_enabled = False
        self.context_compressor = types.SimpleNamespace(
            protect_first_n=2, protect_last_n=2
        )
        self._cached_system_prompt = "SYSTEM"
        self._memory_store = None
        self._memory_manager = None
        self._memory_nudge_interval = 0
        self._turns_since_memory = 0
        self._user_turn_count = 0
        self._todo_store = _FakeTodoStore()
        self._tool_guardrails = _FakeGuardrails()
        self._compression_warning = None
        self._interrupt_requested = False
        self._memory_write_origin = "assistant_tool"
        self._stream_context_scrubber = None
        self._stream_think_scrubber = None

    def _ensure_db_session(self):
        pass

    def _restore_primary_runtime(self):
        pass

    def _cleanup_dead_connections(self):
        return False

    def _emit_status(self, _msg):
        pass

    def _replay_compression_warning(self):
        pass

    def _hydrate_todo_store(self, *_a, **_k):
        pass

    def _safe_print(self, *_a, **_k):
        pass

    def _persist_session(self, messages, _history=None):
        pass


def _build(agent, **overrides):
    kwargs = dict(
        agent=agent,
        user_message="hello",
        system_message=None,
        conversation_history=None,
        task_id=None,
        stream_callback=None,
        persist_user_message=None,
        restore_or_build_system_prompt=lambda *a, **k: None,
        install_safe_stdio=lambda: None,
        sanitize_surrogates=lambda s: s,
        summarize_user_message_for_log=lambda s: str(s),
        set_session_context=lambda _sid: None,
        set_current_write_origin=lambda _o: None,
        ra=lambda: types.SimpleNamespace(_set_interrupt=lambda *a, **k: None),
    )
    kwargs.update(overrides)
    return build_turn_context(**kwargs)


@pytest.fixture(autouse=True)
def _stub_runtime_main():
    with patch("agent.auxiliary_client.set_runtime_main", lambda *a, **k: None):
        yield


RESET_NOTE = (
    "[System note: The user's previous session expired due to inactivity. "
    "This is a fresh conversation with no prior context.]"
)
VC_NOTE = "[Voice channel now: dev-vc (2 members)]"


class TestConsumeIsOneShot:
    def test_consume_clears_the_attribute(self):
        agent = _FakeAgent()
        agent._gateway_turn_context_notes = RESET_NOTE
        assert consume_gateway_turn_context_notes(agent) == RESET_NOTE
        assert consume_gateway_turn_context_notes(agent) == ""

    def test_absent_attribute_is_empty(self):
        assert consume_gateway_turn_context_notes(_FakeAgent()) == ""

    def test_non_string_value_is_empty(self):
        agent = _FakeAgent()
        agent._gateway_turn_context_notes = ["not-a-string"]
        assert consume_gateway_turn_context_notes(agent) == ""


class TestStringContentSidecarDelivery:
    def test_notes_ride_the_api_content_sidecar(self):
        """String user message: the note lands in the API copy only — the
        stored content stays clean and the sidecar persists the exact sent
        bytes (replay keeps them byte-stable in history)."""
        agent = _FakeAgent()
        agent._gateway_turn_context_notes = RESET_NOTE
        with patch("hermes_cli.plugins.invoke_hook", return_value=[]):
            ctx = _build(agent)
        msg = ctx.messages[ctx.current_turn_user_idx]
        assert msg["content"] == "hello"
        assert msg["api_content"] == "hello\n\n" + RESET_NOTE
        # The composed bytes match what conversation_loop would send.
        assert msg["api_content"] == compose_user_api_content(
            "hello", ctx.ext_prefetch_cache, ctx.plugin_user_context
        )
        # Consumed: a later turn on the same cached agent replays nothing.
        assert agent._gateway_turn_context_notes == ""

    def test_notes_append_after_plugin_context(self):
        agent = _FakeAgent()
        agent._gateway_turn_context_notes = VC_NOTE
        with patch(
            "hermes_cli.plugins.invoke_hook",
            return_value=[{"context": "PLUGIN-CTX"}],
        ):
            ctx = _build(agent)
        msg = ctx.messages[ctx.current_turn_user_idx]
        assert msg["api_content"] == "hello\n\nPLUGIN-CTX\n\n" + VC_NOTE

    def test_no_notes_means_no_stamp(self):
        agent = _FakeAgent()
        with patch("hermes_cli.plugins.invoke_hook", return_value=[]):
            ctx = _build(agent)
        assert "api_content" not in ctx.messages[ctx.current_turn_user_idx]


class TestMultimodalFallback:
    def test_notes_appended_as_text_part_on_list_content(self):
        """Multimodal turns can't take the string sidecar
        (compose_user_api_content returns None for lists) — the must-deliver
        fact is appended as a durable text part instead of dropping."""
        agent = _FakeAgent()
        agent._gateway_turn_context_notes = RESET_NOTE
        content = [
            {"type": "text", "text": "look at this"},
            {"type": "image_url", "image_url": {"url": "https://x/img.png"}},
        ]
        with patch("hermes_cli.plugins.invoke_hook", return_value=[]):
            ctx = _build(agent, user_message=content)
        msg = ctx.messages[ctx.current_turn_user_idx]
        assert msg["content"][-1] == {"type": "text", "text": RESET_NOTE}
        # No string sidecar for list content.
        assert "api_content" not in msg

    def test_helper_appends_only_to_lists(self):
        content = [{"type": "text", "text": "hi"}]
        assert append_notes_to_multimodal_content(content, "NOTE") is True
        assert content[-1] == {"type": "text", "text": "NOTE"}
        assert append_notes_to_multimodal_content("string", "NOTE") is False
        assert append_notes_to_multimodal_content(content, "") is False