import asyncio
import pytest

from pathlib import Path
from hermes_cli import kanban_db as kb
from unittest.mock import AsyncMock, MagicMock, patch


# ---------------------------------------------------------------------------
# Fixtures
# ---------------------------------------------------------------------------

@pytest.fixture
def kanban_home(tmp_path, monkeypatch):
    home = tmp_path / ".hermes"
    home.mkdir()
    monkeypatch.setenv("HERMES_HOME", str(home))
    monkeypatch.setattr(Path, "home", lambda: tmp_path)
    kb.init_db()
    return home


@pytest.mark.asyncio
async def test_notifier_unsubs_after_completed_event(kanban_home):
    """
    Subscription should be remove after completed event
    """
    import hermes_cli.kanban_db as kb
    from gateway.run import GatewayRunner
    from gateway.config import Platform

    conn = kb.connect()
    try:
        tid = kb.create_task(conn, title="test task", assignee="worker1")
        kb.add_notify_sub(conn, task_id=tid, platform="telegram", chat_id="chat1")
        kb.complete_task(conn, tid, result="completed by agent")
    finally:
        conn.close()

    runner = object.__new__(GatewayRunner)
    runner._running = True
    runner._kanban_sub_fail_counts = {}

    fake_adapter = MagicMock()

    async def _send_and_stop(chat_id, msg, metadata=None):
        runner._running = False

    fake_adapter.send = AsyncMock(side_effect=_send_and_stop)
    runner.adapters = {Platform.TELEGRAM: fake_adapter}

    _orig_sleep = asyncio.sleep

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

    with patch("gateway.run.asyncio.sleep", side_effect=_fast_sleep):
        await asyncio.wait_for(
            runner._kanban_notifier_watcher(interval=1),
            timeout=10.0,
        )

    fake_adapter.send.assert_called_once()
    call_msg = fake_adapter.send.call_args[0][1]
    assert "completed" in call_msg

    conn = kb.connect()
    try:
        subs = kb.list_notify_subs(conn, tid)
    finally:
        conn.close()
    assert subs == [], "Subscription should be unsub after completed event"


@pytest.mark.asyncio
@pytest.mark.parametrize('kind', ["gave_up", "crashed", "timed_out"])
async def test_notifier_unsubs_after_abnormal_events(kind, kanban_home):
    """
    Event kinds gave_up / crashed / timed_out send a notification but DO
    NOT delete the subscription. The dispatcher may respawn the task and
    fire the same event kind again (e.g. a worker that crashes, gets
    reclaimed, and crashes a second time); the user must hear about the
    second event too. Subscriptions are removed only when the task hits
    a truly final status (done / archived) — see the comment on
    TERMINAL_KINDS in gateway/run.py and PR #21398.
    """
    import hermes_cli.kanban_db as kb
    from gateway.run import GatewayRunner
    from gateway.config import Platform

    conn = kb.connect()

    try:
        tid = kb.create_task(conn, title=f"test {kind} task", assignee="worker1")
        kb.add_notify_sub(conn, task_id=tid, platform="telegram", chat_id="chat1")
        kb._append_event(conn, tid, kind=kind)
    finally:
        conn.close()

    runner = object.__new__(GatewayRunner)
    runner._running = True
    runner._kanban_sub_fail_counts = {}

    fake_adapter = MagicMock()

    async def _send_and_stop(chat_id, msg, metadata=None):
        runner._running = False

    fake_adapter.send = AsyncMock(side_effect=_send_and_stop)
    runner.adapters = {Platform.TELEGRAM: fake_adapter}

    _orig_sleep = asyncio.sleep

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

    with patch("gateway.run.asyncio.sleep", side_effect=_fast_sleep):
        await asyncio.wait_for(
            runner._kanban_notifier_watcher(interval=1),
            timeout=10.0,
        )

    # The user is notified about the abnormal event...
    fake_adapter.send.assert_called_once()
    assert kind.replace('_', ' ') in fake_adapter.send.call_args[0][1]

    # ...but the subscription survives so a respawn-then-same-event cycle
    # reaches the user too. The cursor (last_event_id) advanced inside
    # the same write txn as the claim, so the same event won't re-fire.
    conn = kb.connect()
    try:
        subs = kb.list_notify_subs(conn, tid)
    finally:
        conn.close()
    assert len(subs) == 1, (
        f"Subscription should survive {kind!r} so the next cycle of the "
        f"same event reaches the user; got {subs!r}"
    )
    assert int(subs[0]["last_event_id"]) >= 1, (
        "Cursor should have advanced past the delivered event "
        "(claim_unseen_events_for_sub advances atomically inside the "
        "same write txn as the read)."
    )


@pytest.mark.asyncio
async def test_notifier_second_blocked_delivers(kanban_home):
    """
    After the first blocked, should receive second blocked notification.
    """
    import hermes_cli.kanban_db as kb
    from gateway.run import GatewayRunner
    from gateway.config import Platform

    runner = object.__new__(GatewayRunner)
    runner._running = True
    runner._kanban_sub_fail_counts = {}

    delivered_msgs: list[str] = []

    async def _capture_send(chat_id, msg, metadata=None):
        delivered_msgs.append(msg)

    fake_adapter = MagicMock()
    fake_adapter.send = AsyncMock(side_effect=_capture_send)
    runner.adapters = {Platform.TELEGRAM: fake_adapter}

    _orig_sleep = asyncio.sleep
    tick_count = 0

    async def _fast_sleep(_):
        nonlocal tick_count
        await _orig_sleep(0)
        tick_count += 1
        if tick_count >= 6:
            runner._running = False

    conn = kb.connect()
    try:
        tid = kb.create_task(conn, title="test task", assignee="worker1")
        kb.add_notify_sub(conn, task_id=tid, platform="telegram", chat_id="chat1")

        # Cycle 1: blocked
        kb.block_task(conn, tid, reason="first block")
    finally:
        conn.close()

    with patch("gateway.run.asyncio.sleep", side_effect=_fast_sleep):
        await asyncio.wait_for(
            runner._kanban_notifier_watcher(interval=1),
            timeout=10.0,
        )

    # Cycle 2: unblock → block run again
    runner._running = True
    tick_count = 0

    conn = kb.connect()
    try:
        kb.unblock_task(conn, tid)
        kb.block_task(conn, tid, reason="second block")
    finally:
        conn.close()

    with patch("gateway.run.asyncio.sleep", side_effect=_fast_sleep):
        await asyncio.wait_for(
            runner._kanban_notifier_watcher(interval=1),
            timeout=10.0,
        )

    blocked_deliveries = [m for m in delivered_msgs if "blocked" in m]
    assert "second block" not in blocked_deliveries[0]
    assert "second block" in blocked_deliveries[1]
    assert len(blocked_deliveries) == 2, (
        f"Should receive 2 blocked notification, but only get {len(blocked_deliveries)} count\n"
        f"Message {delivered_msgs}"
    )


# ---------------------------------------------------------------------------
# Regression: gateway watchers must not double-init the kanban DB.
#
# Both the notifier watcher (`_kanban_notifier_watcher`) and the dispatcher
# tick (`_tick_once_for_board`) used to call `_kb.connect(board=slug)`
# immediately followed by `_kb.init_db(board=slug)`. Since `connect()`
# already runs the schema + idempotent migration on first open per process,
# the explicit `init_db()` was redundant — and worse, `init_db()`
# deliberately busts the per-process cache and re-runs the migration on a
# *second* connection, which races the first.  On legacy DBs this surfaced
# as `duplicate column name: <col>` (now tolerated by
# `_add_column_if_missing`) and intermittent `database is locked` errors
# (issue #21378).
#
# The fix removes the `init_db()` calls in both watchers; this regression
# test pins that behaviour so we don't reintroduce them.
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_notifier_does_not_call_init_db(kanban_home):
    """Notifier watcher path must not invoke `_kb.init_db` (issue #21378)."""
    import hermes_cli.kanban_db as kb
    from gateway.run import GatewayRunner
    from gateway.config import Platform

    runner = object.__new__(GatewayRunner)
    runner._running = True
    runner._kanban_sub_fail_counts = {}

    fake_adapter = MagicMock()
    fake_adapter.send = AsyncMock()
    runner.adapters = {Platform.TELEGRAM: fake_adapter}

    _orig_sleep = asyncio.sleep
    tick_count = 0

    async def _fast_sleep(_):
        nonlocal tick_count
        await _orig_sleep(0)
        tick_count += 1
        if tick_count >= 3:
            runner._running = False

    init_db_calls: list[object] = []
    real_init_db = kb.init_db

    def _spy_init_db(*args, **kwargs):
        init_db_calls.append((args, kwargs))
        return real_init_db(*args, **kwargs)

    with patch("gateway.run.asyncio.sleep", side_effect=_fast_sleep), \
         patch("hermes_cli.kanban_db.init_db", side_effect=_spy_init_db):
        await asyncio.wait_for(
            runner._kanban_notifier_watcher(interval=1),
            timeout=10.0,
        )

    assert init_db_calls == [], (
        "_kanban_notifier_watcher must not call init_db on every tick — "
        "connect() handles first-run schema init. "
        "Reintroducing init_db revives issue #21378. "
        f"Got {len(init_db_calls)} call(s): {init_db_calls}"
    )


def test_dispatcher_tick_does_not_call_init_db(kanban_home, monkeypatch):
    """`_tick_once_for_board` must not invoke `_kb.init_db` (issue #21378).

    `connect()` already runs the schema + idempotent migration on first open
    per process. The explicit `init_db()` call was redundant and triggered a
    second migration on a second connection that raced the first.
    """
    import hermes_cli.kanban_db as kb
    from gateway.run import GatewayRunner
    from unittest.mock import patch

    runner = object.__new__(GatewayRunner)

    init_db_calls: list[object] = []
    real_init_db = kb.init_db

    def _spy_init_db(*args, **kwargs):
        init_db_calls.append((args, kwargs))
        return real_init_db(*args, **kwargs)

    # The dispatcher watcher's tick lives as a local closure inside
    # `_kanban_dispatcher_watcher`. Read the source and assert the
    # specific patterns that would reintroduce the bug are absent.
    import inspect
    src = inspect.getsource(GatewayRunner._kanban_dispatcher_watcher)
    assert "_kb.init_db(board=slug)" not in src, (
        "_kanban_dispatcher_watcher must not call _kb.init_db(board=slug) — "
        "see issue #21378. Use connect() alone; it runs migrations on first "
        "open per process."
    )

    notifier_src = inspect.getsource(GatewayRunner._kanban_notifier_watcher)
    assert "_kb.init_db(board=slug)" not in notifier_src, (
        "_kanban_notifier_watcher must not call _kb.init_db(board=slug) — "
        "see issue #21378."
    )