"""Tests for MB-Secure snapshot and event coordination."""

from unittest.mock import AsyncMock, MagicMock

import pytest
from homeassistant.core import HomeAssistant
from homeassistant.exceptions import ConfigEntryAuthFailed
from homeassistant.helpers.update_coordinator import UpdateFailed
from pytest_homeassistant_custom_component.common import MockConfigEntry

from custom_components.mb_secure.api import BridgeAuthenticationError
from custom_components.mb_secure.const import CONF_TOKEN, DOMAIN
from custom_components.mb_secure.coordinator import MBSecureCoordinator
from custom_components.mb_secure.models import BridgeInfo, BridgeSnapshot, DomainEvent


def snapshot(state: str = "disarmed", revision: int = 1) -> BridgeSnapshot:
    """Return a minimal area snapshot."""
    return BridgeSnapshot.from_dict(
        {
            "revision": revision,
            "controllers": [
                {
                    "id": "controller-1",
                    "name": "Controller",
                    "state": "online",
                    "capabilities": [],
                }
            ],
            "areas": [
                {
                    "id": "area-1",
                    "controller_id": "controller-1",
                    "name": "Area",
                    "state": state,
                    "capabilities": ["arm_away"],
                }
            ],
            "points": [],
            "modules": [],
            "outputs": [],
        }
    )


def coordinator(
    hass: HomeAssistant, client: MagicMock
) -> tuple[MBSecureCoordinator, MockConfigEntry]:
    """Create a coordinator and attached mock config entry."""
    entry = MockConfigEntry(
        domain=DOMAIN,
        data={"host": "bridge.local", "port": 8099, CONF_TOKEN: "x" * 32},
        unique_id="bridge-installation-1",
    )
    entry.add_to_hass(hass)
    return MBSecureCoordinator(hass, entry, client), entry


async def test_snapshot_authentication_failure_starts_reauth(
    hass: HomeAssistant,
) -> None:
    """Rejected bridge credentials are converted to Home Assistant reauth."""
    client = MagicMock()
    client.async_get_info = AsyncMock(side_effect=BridgeAuthenticationError)
    instance, _ = coordinator(hass, client)

    with pytest.raises(ConfigEntryAuthFailed):
        await instance._async_update_data()


async def test_snapshot_rejects_changed_bridge_identity(
    hass: HomeAssistant,
) -> None:
    """An endpoint cannot silently replace the configured bridge instance."""
    client = MagicMock()
    client.async_get_info = AsyncMock(
        return_value=BridgeInfo(
            bridge_id="different-installation",
            bridge_version="0.1.0",
            api_version=1,
            connected=True,
            capabilities=frozenset(),
        )
    )
    client.async_get_snapshot = AsyncMock(return_value=snapshot())
    instance, _ = coordinator(hass, client)

    with pytest.raises(UpdateFailed, match="bridge installation ID has changed"):
        await instance._async_update_data()

    client.async_get_snapshot.assert_not_awaited()


async def test_contiguous_event_updates_coordinator_data(
    hass: HomeAssistant,
) -> None:
    """A contiguous event updates state without waiting for the next poll."""
    client = MagicMock()

    async def events():
        yield DomainEvent(
            revision=2,
            event_type="state_changed",
            object_type="area",
            object_id="area-1",
            state="armed_away",
        )
        raise BridgeAuthenticationError

    client.async_events = events
    instance, entry = coordinator(hass, client)
    instance.async_set_updated_data(snapshot())
    entry.async_start_reauth = MagicMock()

    await instance._async_event_loop()

    assert instance.data.revision == 2
    assert instance.data.areas["area-1"].state == "armed_away"
    entry.async_start_reauth.assert_called_once_with(hass)


async def test_event_gap_requests_snapshot_reconciliation(
    hass: HomeAssistant,
) -> None:
    """A revision gap schedules a full snapshot refresh."""
    client = MagicMock()

    async def events():
        yield DomainEvent(
            revision=3,
            event_type="state_changed",
            object_type="area",
            object_id="area-1",
            state="armed_away",
        )
        raise BridgeAuthenticationError

    client.async_events = events
    instance, entry = coordinator(hass, client)
    instance.async_set_updated_data(snapshot())
    instance.async_request_refresh = AsyncMock()
    entry.async_start_reauth = MagicMock()

    await instance._async_event_loop()

    instance.async_request_refresh.assert_awaited_once()
    assert instance.data.revision == 1