"""Support for alarm control panels that can be controlled through IFTTT."""
import logging
import re

import voluptuous as vol

from homeassistant.components.alarm_control_panel import (
    AlarmControlPanel,
    FORMAT_NUMBER,
    FORMAT_TEXT,
)
from homeassistant.components.alarm_control_panel import PLATFORM_SCHEMA
from homeassistant.components.alarm_control_panel.const import (
    SUPPORT_ALARM_ARM_AWAY,
    SUPPORT_ALARM_ARM_HOME,
    SUPPORT_ALARM_ARM_NIGHT,
)
from homeassistant.const import (
    ATTR_ENTITY_ID,
    ATTR_STATE,
    CONF_CODE,
    CONF_NAME,
    CONF_OPTIMISTIC,
    STATE_ALARM_ARMED_AWAY,
    STATE_ALARM_ARMED_HOME,
    STATE_ALARM_ARMED_NIGHT,
    STATE_ALARM_DISARMED,
)
import homeassistant.helpers.config_validation as cv

from . import ATTR_EVENT, DOMAIN, SERVICE_PUSH_ALARM_STATE, SERVICE_TRIGGER

_LOGGER = logging.getLogger(__name__)

ALLOWED_STATES = [
    STATE_ALARM_DISARMED,
    STATE_ALARM_ARMED_NIGHT,
    STATE_ALARM_ARMED_AWAY,
    STATE_ALARM_ARMED_HOME,
]

DATA_IFTTT_ALARM = "ifttt_alarm"
DEFAULT_NAME = "Home"

CONF_EVENT_AWAY = "event_arm_away"
CONF_EVENT_HOME = "event_arm_home"
CONF_EVENT_NIGHT = "event_arm_night"
CONF_EVENT_DISARM = "event_disarm"

DEFAULT_EVENT_AWAY = "alarm_arm_away"
DEFAULT_EVENT_HOME = "alarm_arm_home"
DEFAULT_EVENT_NIGHT = "alarm_arm_night"
DEFAULT_EVENT_DISARM = "alarm_disarm"

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
        vol.Optional(CONF_CODE): cv.string,
        vol.Optional(CONF_EVENT_AWAY, default=DEFAULT_EVENT_AWAY): cv.string,
        vol.Optional(CONF_EVENT_HOME, default=DEFAULT_EVENT_HOME): cv.string,
        vol.Optional(CONF_EVENT_NIGHT, default=DEFAULT_EVENT_NIGHT): cv.string,
        vol.Optional(CONF_EVENT_DISARM, default=DEFAULT_EVENT_DISARM): cv.string,
        vol.Optional(CONF_OPTIMISTIC, default=False): cv.boolean,
    }
)

PUSH_ALARM_STATE_SERVICE_SCHEMA = vol.Schema(
    {vol.Required(ATTR_ENTITY_ID): cv.entity_ids, vol.Required(ATTR_STATE): cv.string}
)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up a control panel managed through IFTTT."""
    if DATA_IFTTT_ALARM not in hass.data:
        hass.data[DATA_IFTTT_ALARM] = []

    name = config.get(CONF_NAME)
    code = config.get(CONF_CODE)
    event_away = config.get(CONF_EVENT_AWAY)
    event_home = config.get(CONF_EVENT_HOME)
    event_night = config.get(CONF_EVENT_NIGHT)
    event_disarm = config.get(CONF_EVENT_DISARM)
    optimistic = config.get(CONF_OPTIMISTIC)

    alarmpanel = IFTTTAlarmPanel(
        name, code, event_away, event_home, event_night, event_disarm, optimistic
    )
    hass.data[DATA_IFTTT_ALARM].append(alarmpanel)
    add_entities([alarmpanel])

    async def push_state_update(service):
        """Set the service state as device state attribute."""
        entity_ids = service.data.get(ATTR_ENTITY_ID)
        state = service.data.get(ATTR_STATE)
        devices = hass.data[DATA_IFTTT_ALARM]
        if entity_ids:
            devices = [d for d in devices if d.entity_id in entity_ids]

        for device in devices:
            device.push_alarm_state(state)
            device.async_schedule_update_ha_state()

    hass.services.register(
        DOMAIN,
        SERVICE_PUSH_ALARM_STATE,
        push_state_update,
        schema=PUSH_ALARM_STATE_SERVICE_SCHEMA,
    )


class IFTTTAlarmPanel(AlarmControlPanel):
    """Representation of an alarm control panel controlled through IFTTT."""

    def __init__(
        self, name, code, event_away, event_home, event_night, event_disarm, optimistic
    ):
        """Initialize the alarm control panel."""
        self._name = name
        self._code = code
        self._event_away = event_away
        self._event_home = event_home
        self._event_night = event_night
        self._event_disarm = event_disarm
        self._optimistic = optimistic
        self._state = None

    @property
    def name(self):
        """Return the name of the device."""
        return self._name

    @property
    def state(self):
        """Return the state of the device."""
        return self._state

    @property
    def supported_features(self) -> int:
        """Return the list of supported features."""
        return SUPPORT_ALARM_ARM_HOME | SUPPORT_ALARM_ARM_AWAY | SUPPORT_ALARM_ARM_NIGHT

    @property
    def assumed_state(self):
        """Notify that this platform return an assumed state."""
        return True

    @property
    def code_format(self):
        """Return one or more digits/characters."""
        if self._code is None:
            return None
        if isinstance(self._code, str) and re.search("^\\d+$", self._code):
            return FORMAT_NUMBER
        return FORMAT_TEXT

    def alarm_disarm(self, code=None):
        """Send disarm command."""
        if not self._check_code(code):
            return
        self.set_alarm_state(self._event_disarm, STATE_ALARM_DISARMED)

    def alarm_arm_away(self, code=None):
        """Send arm away command."""
        if not self._check_code(code):
            return
        self.set_alarm_state(self._event_away, STATE_ALARM_ARMED_AWAY)

    def alarm_arm_home(self, code=None):
        """Send arm home command."""
        if not self._check_code(code):
            return
        self.set_alarm_state(self._event_home, STATE_ALARM_ARMED_HOME)

    def alarm_arm_night(self, code=None):
        """Send arm night command."""
        if not self._check_code(code):
            return
        self.set_alarm_state(self._event_night, STATE_ALARM_ARMED_NIGHT)

    def set_alarm_state(self, event, state):
        """Call the IFTTT trigger service to change the alarm state."""
        data = {ATTR_EVENT: event}

        self.hass.services.call(DOMAIN, SERVICE_TRIGGER, data)
        _LOGGER.debug("Called IFTTT integration to trigger event %s", event)
        if self._optimistic:
            self._state = state

    def push_alarm_state(self, value):
        """Push the alarm state to the given value."""
        if value in ALLOWED_STATES:
            _LOGGER.debug("Pushed the alarm state to %s", value)
            self._state = value

    def _check_code(self, code):
        return self._code is None or self._code == code