"""Integration tests for Supervisor hot-reload with enable/disable/enable flow.

These tests exercise the actual Supervisor._on_config_change code path,
not just AdapterState math in isolation. They verify the rate-limit
guarantee is maintained across adapter stop/start cycles.

IMPORTANT: These tests are designed to:
- FAIL on unfixed code (Test B fails because last_completed_poll is lost)
- PASS on fixed code (last_completed_poll is preserved across disable/enable)
"""

import asyncio
import base64
import os
from datetime import datetime, timedelta, timezone
from pathlib import Path
from unittest.mock import AsyncMock, MagicMock, patch

import pytest
import pytest_asyncio

from central.config_models import AdapterConfig
from central.bootstrap_config import get_settings
from central.crypto import KEY_SIZE, clear_key_cache


def adapter_is_running(state) -> bool:
    """Check if adapter is running (compatible with both fixed and unfixed code)."""
    # Fixed code has is_running property; unfixed checks task directly
    if hasattr(state, 'is_running'):
        return state.is_running
    return state.task is not None and not state.task.done()


async def cleanup_adapter(supervisor, name: str) -> None:
    """Clean up adapter (compatible with both fixed and unfixed code)."""
    # Fixed code has _remove_adapter; unfixed uses _stop_adapter which pops
    if hasattr(supervisor, '_remove_adapter'):
        await supervisor._remove_adapter(name)
    else:
        await supervisor._stop_adapter(name)

# Test database DSN
TEST_DB_DSN = os.environ.get(
    "CENTRAL_TEST_DB_DSN",
    "postgresql://central_test:testpass@localhost/central_test",
)


@pytest.fixture(scope="session")
def master_key_path(tmp_path_factory: pytest.TempPathFactory) -> Path:
    """Create a master key file for the test session."""
    key = os.urandom(KEY_SIZE)
    key_path = tmp_path_factory.mktemp("keys") / "master.key"
    key_path.write_text(base64.b64encode(key).decode())
    return key_path


@pytest.fixture(autouse=True)
def setup_master_key(master_key_path: Path, monkeypatch: pytest.MonkeyPatch):
    """Configure master key path for all tests.

    Clear get_settings (and the crypto key cache) AFTER setting the env so
    crypto rebuilds from the test key regardless of suite order, and again on
    teardown so the test key never leaks into a later test. See PR M-b.
    """
    monkeypatch.setenv("CENTRAL_DB_DSN", TEST_DB_DSN)
    monkeypatch.setenv("CENTRAL_MASTER_KEY_PATH", str(master_key_path))
    clear_key_cache()
    get_settings.cache_clear()
    yield
    clear_key_cache()
    get_settings.cache_clear()


class MockConfigSource:
    """Mock ConfigSource for testing Supervisor without DB."""

    def __init__(self) -> None:
        self._adapters: dict[str, AdapterConfig] = {}

    def set_adapter(self, config: AdapterConfig | None, name: str | None = None) -> None:
        """Set or remove an adapter config."""
        if config is None:
            if name:
                self._adapters.pop(name, None)
        else:
            self._adapters[config.name] = config

    async def list_enabled_adapters(self) -> list[AdapterConfig]:
        return [a for a in self._adapters.values() if a.enabled and not a.is_paused]

    async def get_adapter(self, name: str) -> AdapterConfig | None:
        return self._adapters.get(name)

    async def watch_for_changes(self, callback) -> None:
        # No-op for testing
        return

    async def close(self) -> None:
        pass


class MockNWSAdapter:
    """Mock NWSAdapter that tracks poll calls and allows control."""

    requires_api_key = None  # Mock adapters don't require API keys

    def __init__(self, config, config_store, cursor_db_path) -> None:
        self.config = config
        self._config_store = config_store
        self.cadence_s = config.cadence_s
        self.states = set(s.upper() for s in config.settings.get("states", []))
        self.poll_count = 0
        self.poll_times: list[datetime] = []
        self._shutdown = False

    async def startup(self) -> None:
        pass

    async def shutdown(self) -> None:
        self._shutdown = True

    async def apply_config(self, config: AdapterConfig) -> None:
        """Apply new configuration."""
        self.config = config
        self.cadence_s = config.cadence_s
        self.states = set(s.upper() for s in config.settings.get("states", []))

    async def poll(self):
        """Yield nothing - we just track that poll was called."""
        self.poll_count += 1
        self.poll_times.append(datetime.now(timezone.utc))
        return
        yield  # Make this an async generator

    def is_published(self, event_id: str) -> bool:
        return False

    def mark_published(self, event_id: str) -> None:
        pass

    def bump_last_seen(self, event_id: str) -> None:
        pass

    def sweep_old_ids(self) -> int:
        return 0


@pytest.fixture
def mock_nats():
    """Mock NATS connection.

    nats-py's `nc.jetstream()` is synchronous, so model it with a sync
    MagicMock. (As an AsyncMock attribute, `supervisor._js = nc.jetstream()`
    would assign an unawaited coroutine — the "coroutine ... was never awaited"
    warning — rather than the JetStream mock.)
    """
    mock_nc = AsyncMock()
    mock_nc.publish = AsyncMock()
    mock_js = AsyncMock()
    mock_js.publish = AsyncMock()
    mock_nc.jetstream = MagicMock(return_value=mock_js)
    return mock_nc


@pytest.fixture
def mock_config_store():
    """Mock ConfigStore for testing Supervisor."""
    store = MagicMock()
    store.list_streams = AsyncMock(return_value=[])
    store.get_stream = AsyncMock(return_value=None)
    store.set_adapter_last_error = AsyncMock()
    store.get_api_key = AsyncMock(return_value=None)
    return store


class TestEnableDisableEnableIntegration:
    """Integration tests for enable→disable→enable flow through Supervisor.

    These tests verify that _on_config_change → _stop_adapter → _start_adapter
    preserves last_completed_poll correctly.
    """

    @pytest.mark.asyncio
    async def test_enable_disable_enable_gap_longer_than_cadence(
        self, mock_nats, mock_config_store, tmp_path: Path
    ) -> None:
        """Test A: Re-enable after gap longer than cadence polls immediately.

        - Start adapter (cadence 60s)
        - Simulate completed poll 5 minutes ago
        - Disable adapter
        - Re-enable adapter
        - Assert next poll fires immediately (last+cadence is in past)
        - Assert exactly ONE poll happens, not multiple catch-up
        """
        from central.supervisor import Supervisor, AdapterState

        config_source = MockConfigSource()
        initial_config = AdapterConfig(
            name="nws",
            enabled=True,
            cadence_s=60,
            settings={"states": ["ID"], "contact_email": "test@test.com"},
            paused_at=None,
            updated_at=datetime.now(timezone.utc),
        )
        config_source.set_adapter(initial_config)

        supervisor = Supervisor(
            config_source=config_source,
            config_store=mock_config_store,
            nats_url="nats://localhost:4222",
            cloudevents_config=None,
        )

        # Mock NATS connection
        supervisor._nc = mock_nats
        supervisor._js = mock_nats.jetstream()

        # Patch NWSAdapter to use our mock
        # Inject mock adapter into supervisor's registry
        supervisor._adapters["nws"] = MockNWSAdapter
        # Start supervisor (starts adapter)
        await supervisor._start_adapter(initial_config)

        state = supervisor._adapter_states.get("nws")
        assert state is not None
        assert adapter_is_running(state)

        # Simulate completed poll 5 minutes ago
        state.last_completed_poll = datetime.now(timezone.utc) - timedelta(minutes=5)
        saved_last_poll = state.last_completed_poll

        # Disable adapter
        disabled_config = AdapterConfig(
            name="nws",
            enabled=False,
            cadence_s=60,
            settings={"states": ["ID"], "contact_email": "test@test.com"},
            paused_at=None,
            updated_at=datetime.now(timezone.utc),
        )
        config_source.set_adapter(disabled_config)
        await supervisor._on_config_change("adapters", "nws")

        # Verify stopped but state preserved (THIS IS THE KEY CHECK)
        # On unfixed code, state will be NONE because pop() removes it
        # On fixed code, state still exists with is_running=False
        state = supervisor._adapter_states.get("nws")
        assert state is not None, (
            "State was removed on stop! This violates the rate-limit guarantee. "
            "State should be preserved to maintain last_completed_poll."
        )
        assert not adapter_is_running(state)
        assert state.last_completed_poll == saved_last_poll

        # Re-enable adapter
        reenabled_config = AdapterConfig(
            name="nws",
            enabled=True,
            cadence_s=60,
            settings={"states": ["ID"], "contact_email": "test@test.com"},
            paused_at=None,
            updated_at=datetime.now(timezone.utc),
        )
        config_source.set_adapter(reenabled_config)
        await supervisor._on_config_change("adapters", "nws")

        # Verify restarted with preserved last_completed_poll
        state = supervisor._adapter_states.get("nws")
        assert state is not None
        assert adapter_is_running(state)
        assert state.last_completed_poll == saved_last_poll

        # The loop should detect that last_poll + cadence is in the past
        # and poll immediately. Let's verify by checking the wait time logic.
        now = datetime.now(timezone.utc)
        next_poll_at = saved_last_poll.timestamp() + 60  # cadence = 60s
        wait_time = max(0, next_poll_at - now.timestamp())

        # last_poll was 5 minutes ago, cadence is 60s
        # next_poll_at = 5_minutes_ago + 60s = 4_minutes_ago
        # wait_time should be 0 (poll immediately)
        assert wait_time == 0, (
            f"Expected immediate poll (wait=0), got wait={wait_time}s. "
            f"last_poll was {saved_last_poll}, now is {now}"
        )

        # Cleanup
        supervisor._shutdown_event.set()
        await cleanup_adapter(supervisor, "nws")

    @pytest.mark.asyncio
    async def test_enable_disable_enable_gap_shorter_than_cadence(
        self, mock_nats, mock_config_store, tmp_path: Path
    ) -> None:
        """Test B: Re-enable after gap shorter than cadence respects rate limit.

        THIS IS THE KEY TEST that failed before the fix.

        - Start adapter (cadence 60s)
        - Simulate completed poll 10 seconds ago
        - Disable adapter
        - Re-enable adapter 20 seconds later (still within cadence window)
        - Assert next poll fires at last_poll + 60s, NOT immediately
        """
        from central.supervisor import Supervisor, AdapterState

        config_source = MockConfigSource()
        initial_config = AdapterConfig(
            name="nws",
            enabled=True,
            cadence_s=60,
            settings={"states": ["ID"], "contact_email": "test@test.com"},
            paused_at=None,
            updated_at=datetime.now(timezone.utc),
        )
        config_source.set_adapter(initial_config)

        supervisor = Supervisor(
            config_source=config_source,
            config_store=mock_config_store,
            nats_url="nats://localhost:4222",
            cloudevents_config=None,
        )

        supervisor._nc = mock_nats
        supervisor._js = mock_nats.jetstream()

        # Inject mock adapter into supervisor's registry
        supervisor._adapters["nws"] = MockNWSAdapter
        # Start adapter
        await supervisor._start_adapter(initial_config)

        state = supervisor._adapter_states.get("nws")
        assert state is not None

        # Simulate completed poll 10 seconds ago
        state.last_completed_poll = datetime.now(timezone.utc) - timedelta(seconds=10)
        saved_last_poll = state.last_completed_poll

        # Disable adapter
        disabled_config = AdapterConfig(
            name="nws",
            enabled=False,
            cadence_s=60,
            settings={"states": ["ID"], "contact_email": "test@test.com"},
            paused_at=None,
            updated_at=datetime.now(timezone.utc),
        )
        config_source.set_adapter(disabled_config)
        await supervisor._on_config_change("adapters", "nws")

        # Verify stopped but state preserved (THIS IS THE KEY CHECK)
        # On unfixed code, state will be NONE because pop() removes it
        # On fixed code, state still exists with is_running=False
        state = supervisor._adapter_states.get("nws")
        assert state is not None, (
            "State was removed on stop! This violates the rate-limit guarantee. "
            "State should be preserved to maintain last_completed_poll."
        )
        assert not adapter_is_running(state)
        assert state.last_completed_poll == saved_last_poll

        # Re-enable adapter (simulate 20 seconds later, but we're just
        # checking the rate limit logic)
        reenabled_config = AdapterConfig(
            name="nws",
            enabled=True,
            cadence_s=60,
            settings={"states": ["ID"], "contact_email": "test@test.com"},
            paused_at=None,
            updated_at=datetime.now(timezone.utc),
        )
        config_source.set_adapter(reenabled_config)
        await supervisor._on_config_change("adapters", "nws")

        # Verify restarted with preserved last_completed_poll
        state = supervisor._adapter_states.get("nws")
        assert state is not None
        assert adapter_is_running(state)
        assert state.last_completed_poll == saved_last_poll

        # The loop should detect that last_poll + cadence is still in the future
        # and wait until then.
        now = datetime.now(timezone.utc)
        next_poll_at = saved_last_poll.timestamp() + 60
        wait_time = max(0, next_poll_at - now.timestamp())

        # last_poll was ~10 seconds ago, cadence is 60s
        # wait_time should be ~50s (60 - 10 = 50)
        assert 45 < wait_time < 55, (
            f"Expected ~50s wait (respecting rate limit), got wait={wait_time}s. "
            f"Rate limit violated: poll would happen before last_poll + cadence"
        )

        # Cleanup
        supervisor._shutdown_event.set()
        await cleanup_adapter(supervisor, "nws")

    @pytest.mark.asyncio
    async def test_enable_disable_delete_readd_fresh_state(
        self, mock_nats, mock_config_store, tmp_path: Path
    ) -> None:
        """Test C: Delete then re-add clears preserved state.

        - Start adapter
        - Simulate completed poll
        - Disable adapter
        - DELETE adapter from DB (not just disable)
        - Re-add adapter with same name
        - Assert preserved timestamp is dropped (fresh adapter, immediate poll)
        """
        from central.supervisor import Supervisor

        config_source = MockConfigSource()
        initial_config = AdapterConfig(
            name="nws",
            enabled=True,
            cadence_s=60,
            settings={"states": ["ID"], "contact_email": "test@test.com"},
            paused_at=None,
            updated_at=datetime.now(timezone.utc),
        )
        config_source.set_adapter(initial_config)

        supervisor = Supervisor(
            config_source=config_source,
            config_store=mock_config_store,
            nats_url="nats://localhost:4222",
            cloudevents_config=None,
        )

        supervisor._nc = mock_nats
        supervisor._js = mock_nats.jetstream()

        # Inject mock adapter into supervisor's registry
        supervisor._adapters["nws"] = MockNWSAdapter
        # Start adapter
        await supervisor._start_adapter(initial_config)

        state = supervisor._adapter_states.get("nws")
        assert state is not None

        # Simulate completed poll 10 seconds ago
        state.last_completed_poll = datetime.now(timezone.utc) - timedelta(seconds=10)

        # Disable adapter
        disabled_config = AdapterConfig(
            name="nws",
            enabled=False,
            cadence_s=60,
            settings={"states": ["ID"], "contact_email": "test@test.com"},
            paused_at=None,
            updated_at=datetime.now(timezone.utc),
        )
        config_source.set_adapter(disabled_config)
        await supervisor._on_config_change("adapters", "nws")

        # DELETE adapter from DB (remove from config source)
        config_source.set_adapter(None, name="nws")
        await supervisor._on_config_change("adapters", "nws")

        # Verify adapter fully removed
        assert "nws" not in supervisor._adapter_states

        # Re-add adapter with same name
        new_config = AdapterConfig(
            name="nws",
            enabled=True,
            cadence_s=60,
            settings={"states": ["ID"], "contact_email": "test@test.com"},
            paused_at=None,
            updated_at=datetime.now(timezone.utc),
        )
        config_source.set_adapter(new_config)
        await supervisor._on_config_change("adapters", "nws")

        # Verify new adapter started fresh
        state = supervisor._adapter_states.get("nws")
        assert state is not None
        assert adapter_is_running(state)
        # last_completed_poll should be None (fresh adapter)
        assert state.last_completed_poll is None, (
            f"Expected None (fresh adapter), got {state.last_completed_poll}. "
            f"Preserved state not cleared on delete."
        )

        # Cleanup
        supervisor._shutdown_event.set()
        await cleanup_adapter(supervisor, "nws")

    @pytest.mark.asyncio
    async def test_stop_preserves_state_start_reuses_it(
        self, mock_nats, mock_config_store, tmp_path: Path
    ) -> None:
        """Verify _stop_adapter preserves state and _start_adapter reuses it."""
        from central.supervisor import Supervisor

        config_source = MockConfigSource()
        config = AdapterConfig(
            name="nws",
            enabled=True,
            cadence_s=60,
            settings={"states": ["ID"], "contact_email": "test@test.com"},
            paused_at=None,
            updated_at=datetime.now(timezone.utc),
        )
        config_source.set_adapter(config)

        supervisor = Supervisor(
            config_source=config_source,
            config_store=mock_config_store,
            nats_url="nats://localhost:4222",
            cloudevents_config=None,
        )

        supervisor._nc = mock_nats
        supervisor._js = mock_nats.jetstream()

        # Inject mock adapter into supervisor's registry
        supervisor._adapters["nws"] = MockNWSAdapter
        # Start adapter
        await supervisor._start_adapter(config)

        state = supervisor._adapter_states.get("nws")
        state.last_completed_poll = datetime.now(timezone.utc) - timedelta(seconds=30)
        saved_poll = state.last_completed_poll

        # Stop adapter
        await supervisor._stop_adapter("nws")

        # State should still exist
        assert "nws" in supervisor._adapter_states
        state = supervisor._adapter_states["nws"]
        assert not adapter_is_running(state)
        assert state.last_completed_poll == saved_poll

        # Restart adapter
        await supervisor._start_adapter(config)

        # Should reuse existing state
        state = supervisor._adapter_states.get("nws")
        assert adapter_is_running(state)
        assert state.last_completed_poll == saved_poll

        # Cleanup
        supervisor._shutdown_event.set()
        await cleanup_adapter(supervisor, "nws")

    @pytest.mark.asyncio
    async def test_remove_adapter_clears_state(
        self, mock_nats, mock_config_store, tmp_path: Path
    ) -> None:
        """Verify _remove_adapter fully clears state."""
        from central.supervisor import Supervisor

        config_source = MockConfigSource()
        config = AdapterConfig(
            name="nws",
            enabled=True,
            cadence_s=60,
            settings={"states": ["ID"], "contact_email": "test@test.com"},
            paused_at=None,
            updated_at=datetime.now(timezone.utc),
        )
        config_source.set_adapter(config)

        supervisor = Supervisor(
            config_source=config_source,
            config_store=mock_config_store,
            nats_url="nats://localhost:4222",
            cloudevents_config=None,
        )

        supervisor._nc = mock_nats
        supervisor._js = mock_nats.jetstream()

        # Inject mock adapter into supervisor's registry
        supervisor._adapters["nws"] = MockNWSAdapter
        await supervisor._start_adapter(config)

        state = supervisor._adapter_states.get("nws")
        state.last_completed_poll = datetime.now(timezone.utc)

        # Remove adapter
        await cleanup_adapter(supervisor, "nws")

        # State should be gone
        assert "nws" not in supervisor._adapter_states


def test_enrichment_cache_path_is_hermetic(mock_config_store, tmp_path: Path) -> None:
    """No test may touch the production enrichment cache.

    The autouse `isolate_enrichment_cache` fixture (conftest) must redirect
    ENRICHMENT_CACHE_DB_PATH off /var/lib/central onto a per-test temp dir, and
    constructing a Supervisor must open the cache there — not in production.
    """
    import central.supervisor as supervisor_mod

    patched = supervisor_mod.ENRICHMENT_CACHE_DB_PATH
    assert tmp_path in patched.parents
    assert "/var/lib/central" not in str(patched)

    supervisor = supervisor_mod.Supervisor(
        config_source=MockConfigSource(),
        config_store=mock_config_store,
        nats_url="nats://localhost:4222",
        cloudevents_config=None,
    )
    # __init__ opened the cache at the temp path, leaving the db file behind.
    assert patched.exists()
    assert supervisor._enrichment_cache is not None