"""Tests that on_session_finalize and on_session_reset plugin hooks fire in the gateway."""
from datetime import datetime
from types import SimpleNamespace
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from gateway.config import GatewayConfig, Platform, PlatformConfig
from gateway.platforms.base import MessageEvent
from gateway.session import SessionEntry, SessionSource, build_session_key


def _make_source() -> SessionSource:
    return SessionSource(
        platform=Platform.TELEGRAM,
        user_id="u1",
        chat_id="c1",
        user_name="tester",
        chat_type="dm",
    )


def _make_event(text: str) -> MessageEvent:
    return MessageEvent(text=text, source=_make_source(), message_id="m1")


def _make_runner():
    from gateway.run import GatewayRunner

    runner = object.__new__(GatewayRunner)
    runner.config = GatewayConfig(
        platforms={Platform.TELEGRAM: PlatformConfig(enabled=True, token="***")}
    )
    adapter = MagicMock()
    adapter.send = AsyncMock()
    runner.adapters = {Platform.TELEGRAM: adapter}
    runner._voice_mode = {}
    runner.hooks = SimpleNamespace(emit=AsyncMock(), loaded_hooks=False)
    runner._session_model_overrides = {}
    runner._pending_model_notes = {}
    runner._background_tasks = set()

    session_key = build_session_key(_make_source())
    session_entry = SessionEntry(
        session_key=session_key,
        session_id="sess-old",
        created_at=datetime.now(),
        updated_at=datetime.now(),
        platform=Platform.TELEGRAM,
        chat_type="dm",
    )
    new_session_entry = SessionEntry(
        session_key=session_key,
        session_id="sess-new",
        created_at=datetime.now(),
        updated_at=datetime.now(),
        platform=Platform.TELEGRAM,
        chat_type="dm",
    )
    runner.session_store = MagicMock()
    runner.session_store.get_or_create_session.return_value = new_session_entry
    runner.session_store.reset_session.return_value = new_session_entry
    runner.session_store._entries = {session_key: session_entry}
    runner.session_store._generate_session_key.return_value = session_key
    runner._running_agents = {}
    runner._pending_messages = {}
    runner._pending_approvals = {}
    runner._session_db = None
    runner._agent_cache_lock = None
    runner._is_user_authorized = lambda _source: True
    runner._format_session_info = lambda: ""

    return runner


@pytest.mark.asyncio
@patch("hermes_cli.plugins.invoke_hook")
async def test_reset_fires_finalize_hook(mock_invoke_hook):
    """/new must fire on_session_finalize with the OLD session id."""
    runner = _make_runner()

    await runner._handle_reset_command(_make_event("/new"))

    assert any(
        c.args == ("on_session_finalize",)
        and c.kwargs["session_id"] == "sess-old"
        and c.kwargs["platform"] == "telegram"
        and c.kwargs["old_session_id"] == "sess-old"
        and c.kwargs["new_session_id"] == "sess-new"
        for c in mock_invoke_hook.call_args_list
    )


@pytest.mark.asyncio
@patch("hermes_cli.plugins.invoke_hook")
async def test_reset_fires_reset_hook(mock_invoke_hook):
    """/new must fire on_session_reset with the NEW session id."""
    runner = _make_runner()

    await runner._handle_reset_command(_make_event("/new"))

    assert any(
        c.args == ("on_session_reset",)
        and c.kwargs["session_id"] == "sess-new"
        and c.kwargs["platform"] == "telegram"
        and c.kwargs["old_session_id"] == "sess-old"
        and c.kwargs["new_session_id"] == "sess-new"
        for c in mock_invoke_hook.call_args_list
    )


@pytest.mark.asyncio
@patch("hermes_cli.plugins.invoke_hook")
async def test_finalize_before_reset(mock_invoke_hook):
    """on_session_finalize must fire before on_session_reset."""
    runner = _make_runner()

    await runner._handle_reset_command(_make_event("/new"))

    calls = [c for c in mock_invoke_hook.call_args_list
             if c[0][0] in {"on_session_finalize", "on_session_reset"}]
    hook_names = [c[0][0] for c in calls]
    assert hook_names == ["on_session_finalize", "on_session_reset"]


@pytest.mark.asyncio
@patch("hermes_cli.plugins.invoke_hook")
async def test_shutdown_fires_finalize_for_active_agents(mock_invoke_hook):
    """Gateway stop() must fire on_session_finalize for each active agent."""
    from gateway.run import GatewayRunner

    runner = object.__new__(GatewayRunner)
    runner._running = True
    runner._background_tasks = set()
    runner._pending_messages = {}
    runner._pending_approvals = {}
    runner._shutdown_event = MagicMock()
    runner.adapters = {}
    runner._exit_reason = "test"
    runner._exit_code = None
    runner._draining = False
    runner._restart_requested = False
    runner._restart_task_started = False
    runner._restart_detached = False
    runner._restart_via_service = False
    runner._restart_drain_timeout = 0.0
    runner._stop_task = None
    runner._running_agents_ts = {}
    runner._update_runtime_status = MagicMock()

    agent1 = MagicMock()
    agent1.session_id = "sess-a"
    agent2 = MagicMock()
    agent2.session_id = "sess-b"
    runner._running_agents = {"key-a": agent1, "key-b": agent2}

    with patch("gateway.status.remove_pid_file"), \
         patch("gateway.status.write_runtime_status"):
        await runner.stop()

    finalize_calls = [
        c for c in mock_invoke_hook.call_args_list
        if c[0][0] == "on_session_finalize"
    ]
    session_ids = {c[1]["session_id"] for c in finalize_calls}
    assert session_ids == {"sess-a", "sess-b"}


@pytest.mark.asyncio
@patch("hermes_cli.plugins.invoke_hook", side_effect=Exception("boom"))
async def test_hook_error_does_not_break_reset(mock_invoke_hook):
    """Plugin hook errors must not prevent /new from completing."""
    runner = _make_runner()

    result = await runner._handle_reset_command(_make_event("/new"))

    # Should still return a success message despite hook errors
    assert "Session reset" in result or "New session" in result


@pytest.mark.asyncio
@patch("hermes_cli.plugins.invoke_hook")
async def test_idle_expiry_fires_finalize_hook(mock_invoke_hook):
    """Regression test for #14981.

    When ``_session_expiry_watcher`` sweeps a session that has aged past
    its reset policy (idle timeout, scheduled reset), it must fire
    ``on_session_finalize`` so plugin providers get the same final-pass
    extraction opportunity they'd get from /new or CLI shutdown.  Before
    the fix, the expiry path evicted the agent but silently skipped the
    hook.
    """
    from datetime import datetime, timedelta

    from gateway.run import GatewayRunner

    runner = object.__new__(GatewayRunner)
    runner._running = True
    runner._running_agents = {}
    runner._agent_cache = {}
    runner._agent_cache_lock = None
    runner._last_session_store_prune_ts = 0.0

    session_key = "agent:main:telegram:dm:42"
    expired_entry = SessionEntry(
        session_key=session_key,
        session_id="sess-expired",
        created_at=datetime.now() - timedelta(hours=2),
        updated_at=datetime.now() - timedelta(hours=2),
        platform=Platform.TELEGRAM,
        chat_type="dm",
    )
    expired_entry.expiry_finalized = False

    runner.session_store = MagicMock()
    runner.session_store._ensure_loaded = MagicMock()
    runner.session_store._entries = {session_key: expired_entry}
    runner.session_store._is_session_expired = MagicMock(return_value=True)
    runner.session_store._lock = MagicMock()
    runner.session_store._lock.__enter__ = MagicMock(return_value=None)
    runner.session_store._lock.__exit__ = MagicMock(return_value=None)
    runner.session_store._save = MagicMock()

    runner._evict_cached_agent = MagicMock()
    runner._cleanup_agent_resources = MagicMock()
    runner._sweep_idle_cached_agents = MagicMock(return_value=0)

    # The watcher starts with `await asyncio.sleep(60)` and loops while
    # `self._running`.  Patch sleep so the 60s initial delay is instant, and
    # make the expiry hook invocation flip `_running` false so the loop
    # exits cleanly after one pass.
    _orig_sleep = __import__("asyncio").sleep

    async def _fast_sleep(_):
        await _orig_sleep(0)

    def _hook_and_stop(*a, **kw):
        runner._running = False
        return None

    mock_invoke_hook.side_effect = _hook_and_stop

    with patch("gateway.run.asyncio.sleep", side_effect=_fast_sleep):
        await runner._session_expiry_watcher(interval=0)

    # Look for the finalize call targeting the expired session.
    finalize_calls = [
        c for c in mock_invoke_hook.call_args_list
        if c[0] and c[0][0] == "on_session_finalize"
    ]
    session_ids = {c[1].get("session_id") for c in finalize_calls}
    assert "sess-expired" in session_ids, (
        f"on_session_finalize was not fired during idle expiry; "
        f"got session_ids={session_ids} (regression of #14981)"
    )


@pytest.mark.asyncio
@patch("hermes_cli.plugins.invoke_hook")
async def test_idle_expiry_clears_last_resolved_model(mock_invoke_hook):
    """Regression test for #58403.

    ``_session_expiry_watcher`` permanently finalizes an expired session and
    already drops ``_session_model_overrides`` / the reasoning override /
    ``_pending_model_notes`` — a resumed conversation must not inherit stale
    per-session state. It missed ``_last_resolved_model``: without clearing
    it, a resumed session could serve a cached model from before it went
    idle on a transient config-cache miss, exactly the #58403 class the
    /new and compression-exhausted-reset paths already guard against.
    """
    from datetime import datetime, timedelta

    from gateway.run import GatewayRunner

    runner = object.__new__(GatewayRunner)
    runner._running = True
    runner._running_agents = {}
    runner._agent_cache = {}
    runner._agent_cache_lock = None
    runner._last_session_store_prune_ts = 0.0

    session_key = "agent:main:telegram:dm:42"
    expired_entry = SessionEntry(
        session_key=session_key,
        session_id="sess-expired",
        created_at=datetime.now() - timedelta(hours=2),
        updated_at=datetime.now() - timedelta(hours=2),
        platform=Platform.TELEGRAM,
        chat_type="dm",
    )
    expired_entry.expiry_finalized = False

    runner.session_store = MagicMock()
    runner.session_store._ensure_loaded = MagicMock()
    runner.session_store._entries = {session_key: expired_entry}
    runner.session_store._is_session_expired = MagicMock(return_value=True)
    runner.session_store._lock = MagicMock()
    runner.session_store._lock.__enter__ = MagicMock(return_value=None)
    runner.session_store._lock.__exit__ = MagicMock(return_value=None)
    runner.session_store._save = MagicMock()

    runner._evict_cached_agent = MagicMock()
    runner._cleanup_agent_resources = MagicMock()
    runner._sweep_idle_cached_agents = MagicMock(return_value=0)
    runner._session_model_overrides = {}
    runner._pending_model_notes = {}
    runner._last_resolved_model = {
        session_key: "gpt-5",
        "agent:main:telegram:dm:other": "keep-me",
    }

    _orig_sleep = __import__("asyncio").sleep

    async def _fast_sleep(_):
        await _orig_sleep(0)

    def _hook_and_stop(*a, **kw):
        runner._running = False
        return None

    mock_invoke_hook.side_effect = _hook_and_stop

    with patch("gateway.run.asyncio.sleep", side_effect=_fast_sleep):
        await runner._session_expiry_watcher(interval=0)

    assert session_key not in runner._last_resolved_model, (
        "session-expiry finalization did not clear the expired session's "
        "_last_resolved_model entry (#58403)"
    )
    assert runner._last_resolved_model["agent:main:telegram:dm:other"] == "keep-me", (
        "session-expiry finalization must only clear the expired session's "
        "own key, not unrelated sessions' cached entries"
    )
