"""The Risco integration."""
from collections.abc import Callable
from dataclasses import dataclass, field
from datetime import timedelta
import logging
from typing import Any

from pyrisco import (
    CannotConnectError,
    OperationError,
    RiscoCloud,
    RiscoLocal,
    UnauthorizedError,
)
from pyrisco.common import Partition, Zone

from homeassistant.config_entries import ConfigEntry
from homeassistant.const import (
    CONF_HOST,
    CONF_PASSWORD,
    CONF_PIN,
    CONF_PORT,
    CONF_SCAN_INTERVAL,
    CONF_TYPE,
    CONF_USERNAME,
    Platform,
)
from homeassistant.core import HomeAssistant
from homeassistant.exceptions import ConfigEntryAuthFailed, ConfigEntryNotReady
from homeassistant.helpers.aiohttp_client import async_get_clientsession
from homeassistant.helpers.dispatcher import async_dispatcher_send
from homeassistant.helpers.storage import Store
from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed

from .const import (
    DATA_COORDINATOR,
    DEFAULT_SCAN_INTERVAL,
    DOMAIN,
    EVENTS_COORDINATOR,
    TYPE_LOCAL,
)

PLATFORMS = [
    Platform.ALARM_CONTROL_PANEL,
    Platform.BINARY_SENSOR,
    Platform.SENSOR,
    Platform.SWITCH,
]
LAST_EVENT_STORAGE_VERSION = 1
LAST_EVENT_TIMESTAMP_KEY = "last_event_timestamp"
_LOGGER = logging.getLogger(__name__)


@dataclass
class LocalData:
    """A data class for local data passed to the platforms."""

    system: RiscoLocal
    partition_updates: dict[int, Callable[[], Any]] = field(default_factory=dict)


def is_local(entry: ConfigEntry) -> bool:
    """Return whether the entry represents an instance with local communication."""
    return entry.data.get(CONF_TYPE) == TYPE_LOCAL


def zone_update_signal(zone_id: int) -> str:
    """Return a signal for the dispatch of a zone update."""
    return f"risco_zone_update_{zone_id}"


async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
    """Set up Risco from a config entry."""
    if is_local(entry):
        return await _async_setup_local_entry(hass, entry)

    return await _async_setup_cloud_entry(hass, entry)


async def _async_setup_local_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
    data = entry.data
    risco = RiscoLocal(data[CONF_HOST], data[CONF_PORT], data[CONF_PIN])

    try:
        await risco.connect()
    except CannotConnectError as error:
        raise ConfigEntryNotReady() from error
    except UnauthorizedError:
        _LOGGER.exception("Failed to login to Risco cloud")
        return False

    async def _error(error: Exception) -> None:
        _LOGGER.error("Error in Risco library: %s", error)

    entry.async_on_unload(risco.add_error_handler(_error))

    async def _default(command: str, result: str, *params: list[str]) -> None:
        _LOGGER.debug(
            "Unhandled update from Risco library: %s, %s, %s", command, result, params
        )

    entry.async_on_unload(risco.add_default_handler(_default))

    local_data = LocalData(risco)

    async def _zone(zone_id: int, zone: Zone) -> None:
        _LOGGER.debug("Risco zone update for %d", zone_id)
        async_dispatcher_send(hass, zone_update_signal(zone_id))

    entry.async_on_unload(risco.add_zone_handler(_zone))

    async def _partition(partition_id: int, partition: Partition) -> None:
        _LOGGER.debug("Risco partition update for %d", partition_id)
        callback = local_data.partition_updates.get(partition_id)
        if callback:
            callback()

    entry.async_on_unload(risco.add_partition_handler(_partition))

    entry.async_on_unload(entry.add_update_listener(_update_listener))

    hass.data.setdefault(DOMAIN, {})
    hass.data[DOMAIN][entry.entry_id] = local_data
    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)

    return True


async def _async_setup_cloud_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
    data = entry.data
    risco = RiscoCloud(data[CONF_USERNAME], data[CONF_PASSWORD], data[CONF_PIN])
    try:
        await risco.login(async_get_clientsession(hass))
    except CannotConnectError as error:
        raise ConfigEntryNotReady from error
    except UnauthorizedError as error:
        raise ConfigEntryAuthFailed from error

    scan_interval = entry.options.get(CONF_SCAN_INTERVAL, DEFAULT_SCAN_INTERVAL)
    coordinator = RiscoDataUpdateCoordinator(hass, risco, scan_interval)
    await coordinator.async_config_entry_first_refresh()
    events_coordinator = RiscoEventsDataUpdateCoordinator(
        hass, risco, entry.entry_id, 60
    )

    entry.async_on_unload(entry.add_update_listener(_update_listener))

    hass.data.setdefault(DOMAIN, {})
    hass.data[DOMAIN][entry.entry_id] = {
        DATA_COORDINATOR: coordinator,
        EVENTS_COORDINATOR: events_coordinator,
    }

    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
    await events_coordinator.async_refresh()

    return True


async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
    """Unload a config entry."""
    unload_ok = await hass.config_entries.async_unload_platforms(entry, PLATFORMS)
    if unload_ok:
        if is_local(entry):
            local_data: LocalData = hass.data[DOMAIN][entry.entry_id]
            await local_data.system.disconnect()

        hass.data[DOMAIN].pop(entry.entry_id)

    return unload_ok


async def _update_listener(hass: HomeAssistant, entry: ConfigEntry) -> None:
    """Handle options update."""
    await hass.config_entries.async_reload(entry.entry_id)


class RiscoDataUpdateCoordinator(DataUpdateCoordinator):
    """Class to manage fetching risco data."""

    def __init__(self, hass, risco, scan_interval):
        """Initialize global risco data updater."""
        self.risco = risco
        interval = timedelta(seconds=scan_interval)
        super().__init__(
            hass,
            _LOGGER,
            name=DOMAIN,
            update_interval=interval,
        )

    async def _async_update_data(self):
        """Fetch data from risco."""
        try:
            return await self.risco.get_state()
        except (CannotConnectError, UnauthorizedError, OperationError) as error:
            raise UpdateFailed(error) from error


class RiscoEventsDataUpdateCoordinator(DataUpdateCoordinator):
    """Class to manage fetching risco data."""

    def __init__(self, hass, risco, eid, scan_interval):
        """Initialize global risco data updater."""
        self.risco = risco
        self._store = Store(
            hass, LAST_EVENT_STORAGE_VERSION, f"risco_{eid}_last_event_timestamp"
        )
        interval = timedelta(seconds=scan_interval)
        super().__init__(
            hass,
            _LOGGER,
            name=f"{DOMAIN}_events",
            update_interval=interval,
        )

    async def _async_update_data(self):
        """Fetch data from risco."""
        last_store = await self._store.async_load() or {}
        last_timestamp = last_store.get(
            LAST_EVENT_TIMESTAMP_KEY, "2020-01-01T00:00:00Z"
        )
        try:
            events = await self.risco.get_events(last_timestamp, 10)
        except (CannotConnectError, UnauthorizedError, OperationError) as error:
            raise UpdateFailed(error) from error

        if len(events) > 0:
            await self._store.async_save({LAST_EVENT_TIMESTAMP_KEY: events[0].time})

        return events