"""Tests for the Slack ``require_mention_channels`` per-channel override.

Channels listed here ALWAYS require an explicit bot @mention, even when
``require_mention`` is disabled globally or the channel would otherwise be
free-response — the opposite direction of ``free_response_channels`` (#13855).
Wake checks (bot-authored thread, previously mentioned thread, active session)
still apply, so ongoing conversations are not cut off.
"""

import sys
from unittest.mock import AsyncMock, MagicMock

import pytest

from gateway.config import PlatformConfig


def _ensure_slack_mock():
    if "slack_bolt" in sys.modules and hasattr(sys.modules["slack_bolt"], "__file__"):
        return

    slack_bolt = MagicMock()
    slack_bolt.async_app.AsyncApp = MagicMock
    slack_bolt.adapter.socket_mode.async_handler.AsyncSocketModeHandler = MagicMock

    slack_sdk = MagicMock()
    slack_sdk.web.async_client.AsyncWebClient = MagicMock

    for name, mod in [
        ("slack_bolt", slack_bolt),
        ("slack_bolt.async_app", slack_bolt.async_app),
        ("slack_bolt.adapter", slack_bolt.adapter),
        ("slack_bolt.adapter.socket_mode", slack_bolt.adapter.socket_mode),
        (
            "slack_bolt.adapter.socket_mode.async_handler",
            slack_bolt.adapter.socket_mode.async_handler,
        ),
        ("slack_sdk", slack_sdk),
        ("slack_sdk.web", slack_sdk.web),
        ("slack_sdk.web.async_client", slack_sdk.web.async_client),
    ]:
        sys.modules.setdefault(name, mod)


_ensure_slack_mock()

import plugins.platforms.slack.adapter as _slack_mod  # noqa: E402

_slack_mod.SLACK_AVAILABLE = True

from plugins.platforms.slack.adapter import SlackAdapter, _apply_yaml_config  # noqa: E402

BOT_USER_ID = "U_BOT"
CHANNEL_ID = "C_FORCED"


@pytest.fixture(autouse=True)
def _clean_env(monkeypatch, tmp_path):
    monkeypatch.setattr(
        "gateway.platforms.base.DOCUMENT_CACHE_DIR", tmp_path / "doc_cache"
    )
    for var in (
        "SLACK_REQUIRE_MENTION",
        "SLACK_REQUIRE_MENTION_CHANNELS",
        "SLACK_FREE_RESPONSE_CHANNELS",
        "SLACK_STRICT_MENTION",
        "SLACK_THREAD_REQUIRE_MENTION",
    ):
        monkeypatch.delenv(var, raising=False)


@pytest.fixture()
def adapter():
    config = PlatformConfig(enabled=True, token="xoxb-fake-token")
    a = SlackAdapter(config)
    a._app = MagicMock()
    a._app.client = AsyncMock()
    a._app.client.users_info = AsyncMock(
        return_value={
            "user": {
                "is_bot": False,
                "profile": {"display_name": "Test User"},
                "real_name": "Test User",
            }
        }
    )
    a._bot_user_id = BOT_USER_ID
    a._running = True
    a.handle_message = AsyncMock()
    a._fetch_thread_context = AsyncMock(return_value="")
    a._fetch_thread_parent_text = AsyncMock(return_value="")
    a._has_active_session_for_thread = MagicMock(return_value=False)
    return a


def _event(text, ts="100.000", thread_ts=None, channel=CHANNEL_ID):
    event = {
        "type": "message",
        "channel": channel,
        "channel_type": "channel",
        "user": "U_HUMAN",
        "text": text,
        "ts": ts,
    }
    if thread_ts is not None:
        event["thread_ts"] = thread_ts
    return event


# ---------------------------------------------------------------------------
# _slack_require_mention_channels() parsing
# ---------------------------------------------------------------------------


def _make(extra=None):
    a = object.__new__(SlackAdapter)
    a.config = PlatformConfig(enabled=True, extra=dict(extra or {}))
    return a


def test_require_mention_channels_default_empty():
    assert _make()._slack_require_mention_channels() == set()


def test_require_mention_channels_csv_and_list():
    assert _make({"require_mention_channels": "C1, C2"})._slack_require_mention_channels() == {
        "C1",
        "C2",
    }
    assert _make({"require_mention_channels": ["C1", "C2"]})._slack_require_mention_channels() == {
        "C1",
        "C2",
    }


def test_require_mention_channels_env_fallback(monkeypatch):
    monkeypatch.setenv("SLACK_REQUIRE_MENTION_CHANNELS", "C9")
    assert _make()._slack_require_mention_channels() == {"C9"}


def test_yaml_bridge_sets_env(monkeypatch):
    monkeypatch.delenv("SLACK_REQUIRE_MENTION_CHANNELS", raising=False)
    _apply_yaml_config({}, {"require_mention_channels": ["C1", "C2"]})
    import os

    assert os.environ["SLACK_REQUIRE_MENTION_CHANNELS"] == "C1,C2"
    monkeypatch.delenv("SLACK_REQUIRE_MENTION_CHANNELS", raising=False)


# ---------------------------------------------------------------------------
# Routing behaviour
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_forced_channel_requires_mention_even_when_global_off(adapter):
    adapter.config.extra["require_mention"] = False
    adapter.config.extra["require_mention_channels"] = CHANNEL_ID

    await adapter._handle_slack_message(_event("ambient chatter"))

    adapter.handle_message.assert_not_called()


@pytest.mark.asyncio
async def test_forced_channel_overrides_free_response(adapter):
    adapter.config.extra["free_response_channels"] = CHANNEL_ID
    adapter.config.extra["require_mention_channels"] = CHANNEL_ID

    await adapter._handle_slack_message(_event("still ambient chatter"))

    adapter.handle_message.assert_not_called()


@pytest.mark.asyncio
async def test_forced_channel_mention_routes(adapter):
    adapter.config.extra["require_mention"] = False
    adapter.config.extra["require_mention_channels"] = CHANNEL_ID

    await adapter._handle_slack_message(_event(f"<@{BOT_USER_ID}> hello"))

    adapter.handle_message.assert_called_once()
    assert adapter.handle_message.call_args[0][0].text == "hello"


@pytest.mark.asyncio
async def test_forced_channel_wake_checks_still_apply(adapter):
    """A previously mentioned thread still auto-follows in a forced channel."""
    adapter.config.extra["require_mention"] = False
    adapter.config.extra["require_mention_channels"] = CHANNEL_ID
    adapter._mentioned_threads.add("100.000")

    await adapter._handle_slack_message(
        _event("follow-up", ts="101.000", thread_ts="100.000")
    )

    adapter.handle_message.assert_called_once()


@pytest.mark.asyncio
async def test_other_channel_stays_free_response(adapter):
    adapter.config.extra["require_mention"] = False
    adapter.config.extra["require_mention_channels"] = CHANNEL_ID

    await adapter._handle_slack_message(
        _event("no mention needed here", channel="C_OTHER")
    )

    adapter.handle_message.assert_called_once()