"""This platform enables the possibility to control a MQTT alarm."""
import logging
import re

import voluptuous as vol

from homeassistant.components import mqtt
import homeassistant.components.alarm_control_panel as alarm
from homeassistant.const import (
    CONF_CODE,
    CONF_DEVICE,
    CONF_NAME,
    CONF_VALUE_TEMPLATE,
    STATE_ALARM_ARMED_AWAY,
    STATE_ALARM_ARMED_HOME,
    STATE_ALARM_ARMED_NIGHT,
    STATE_ALARM_DISARMED,
    STATE_ALARM_PENDING,
    STATE_ALARM_TRIGGERED,
)
from homeassistant.core import callback
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.dispatcher import async_dispatcher_connect
from homeassistant.helpers.typing import ConfigType, HomeAssistantType

from . import (
    ATTR_DISCOVERY_HASH,
    CONF_COMMAND_TOPIC,
    CONF_QOS,
    CONF_RETAIN,
    CONF_STATE_TOPIC,
    CONF_UNIQUE_ID,
    MqttAttributes,
    MqttAvailability,
    MqttDiscoveryUpdate,
    MqttEntityDeviceInfo,
    subscription,
)
from .discovery import MQTT_DISCOVERY_NEW, clear_discovery_hash

_LOGGER = logging.getLogger(__name__)

CONF_CODE_ARM_REQUIRED = "code_arm_required"
CONF_CODE_DISARM_REQUIRED = "code_disarm_required"
CONF_PAYLOAD_DISARM = "payload_disarm"
CONF_PAYLOAD_ARM_HOME = "payload_arm_home"
CONF_PAYLOAD_ARM_AWAY = "payload_arm_away"
CONF_PAYLOAD_ARM_NIGHT = "payload_arm_night"
CONF_COMMAND_TEMPLATE = "command_template"

DEFAULT_COMMAND_TEMPLATE = "{{action}}"
DEFAULT_ARM_NIGHT = "ARM_NIGHT"
DEFAULT_ARM_AWAY = "ARM_AWAY"
DEFAULT_ARM_HOME = "ARM_HOME"
DEFAULT_DISARM = "DISARM"
DEFAULT_NAME = "MQTT Alarm"
PLATFORM_SCHEMA = (
    mqtt.MQTT_BASE_PLATFORM_SCHEMA.extend(
        {
            vol.Optional(CONF_CODE): cv.string,
            vol.Optional(CONF_CODE_ARM_REQUIRED, default=True): cv.boolean,
            vol.Optional(CONF_CODE_DISARM_REQUIRED, default=True): cv.boolean,
            vol.Optional(
                CONF_COMMAND_TEMPLATE, default=DEFAULT_COMMAND_TEMPLATE
            ): cv.template,
            vol.Required(CONF_COMMAND_TOPIC): mqtt.valid_publish_topic,
            vol.Optional(CONF_DEVICE): mqtt.MQTT_ENTITY_DEVICE_INFO_SCHEMA,
            vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
            vol.Optional(CONF_PAYLOAD_ARM_AWAY, default=DEFAULT_ARM_AWAY): cv.string,
            vol.Optional(CONF_PAYLOAD_ARM_HOME, default=DEFAULT_ARM_HOME): cv.string,
            vol.Optional(CONF_PAYLOAD_ARM_NIGHT, default=DEFAULT_ARM_NIGHT): cv.string,
            vol.Optional(CONF_PAYLOAD_DISARM, default=DEFAULT_DISARM): cv.string,
            vol.Optional(CONF_RETAIN, default=mqtt.DEFAULT_RETAIN): cv.boolean,
            vol.Required(CONF_STATE_TOPIC): mqtt.valid_subscribe_topic,
            vol.Optional(CONF_UNIQUE_ID): cv.string,
            vol.Optional(CONF_VALUE_TEMPLATE): cv.template,
        }
    )
    .extend(mqtt.MQTT_AVAILABILITY_SCHEMA.schema)
    .extend(mqtt.MQTT_JSON_ATTRS_SCHEMA.schema)
)


async def async_setup_platform(
    hass: HomeAssistantType, config: ConfigType, async_add_entities, discovery_info=None
):
    """Set up MQTT alarm control panel through configuration.yaml."""
    await _async_setup_entity(config, async_add_entities)


async def async_setup_entry(hass, config_entry, async_add_entities):
    """Set up MQTT alarm control panel dynamically through MQTT discovery."""

    async def async_discover(discovery_payload):
        """Discover and add an MQTT alarm control panel."""
        try:
            discovery_hash = discovery_payload.pop(ATTR_DISCOVERY_HASH)
            config = PLATFORM_SCHEMA(discovery_payload)
            await _async_setup_entity(
                config, async_add_entities, config_entry, discovery_hash
            )
        except Exception:
            if discovery_hash:
                clear_discovery_hash(hass, discovery_hash)
            raise

    async_dispatcher_connect(
        hass, MQTT_DISCOVERY_NEW.format(alarm.DOMAIN, "mqtt"), async_discover
    )


async def _async_setup_entity(
    config, async_add_entities, config_entry=None, discovery_hash=None
):
    """Set up the MQTT Alarm Control Panel platform."""
    async_add_entities([MqttAlarm(config, config_entry, discovery_hash)])


class MqttAlarm(
    MqttAttributes,
    MqttAvailability,
    MqttDiscoveryUpdate,
    MqttEntityDeviceInfo,
    alarm.AlarmControlPanel,
):
    """Representation of a MQTT alarm status."""

    def __init__(self, config, config_entry, discovery_hash):
        """Init the MQTT Alarm Control Panel."""
        self._state = None
        self._config = config
        self._unique_id = config.get(CONF_UNIQUE_ID)
        self._sub_state = None

        device_config = config.get(CONF_DEVICE)

        MqttAttributes.__init__(self, config)
        MqttAvailability.__init__(self, config)
        MqttDiscoveryUpdate.__init__(self, discovery_hash, self.discovery_update)
        MqttEntityDeviceInfo.__init__(self, device_config, config_entry)

    async def async_added_to_hass(self):
        """Subscribe mqtt events."""
        await super().async_added_to_hass()
        await self._subscribe_topics()

    async def discovery_update(self, discovery_payload):
        """Handle updated discovery message."""
        config = PLATFORM_SCHEMA(discovery_payload)
        self._config = config
        await self.attributes_discovery_update(config)
        await self.availability_discovery_update(config)
        await self.device_info_discovery_update(config)
        await self._subscribe_topics()
        self.async_write_ha_state()

    async def _subscribe_topics(self):
        """(Re)Subscribe to topics."""
        value_template = self._config.get(CONF_VALUE_TEMPLATE)
        if value_template is not None:
            value_template.hass = self.hass
        command_template = self._config[CONF_COMMAND_TEMPLATE]
        command_template.hass = self.hass

        @callback
        def message_received(msg):
            """Run when new MQTT message has been received."""
            payload = msg.payload
            if value_template is not None:
                payload = value_template.async_render_with_possible_json_value(
                    msg.payload, self._state
                )
            if payload not in (
                STATE_ALARM_DISARMED,
                STATE_ALARM_ARMED_HOME,
                STATE_ALARM_ARMED_AWAY,
                STATE_ALARM_ARMED_NIGHT,
                STATE_ALARM_PENDING,
                STATE_ALARM_TRIGGERED,
            ):
                _LOGGER.warning("Received unexpected payload: %s", msg.payload)
                return
            self._state = payload
            self.async_write_ha_state()

        self._sub_state = await subscription.async_subscribe_topics(
            self.hass,
            self._sub_state,
            {
                "state_topic": {
                    "topic": self._config[CONF_STATE_TOPIC],
                    "msg_callback": message_received,
                    "qos": self._config[CONF_QOS],
                }
            },
        )

    async def async_will_remove_from_hass(self):
        """Unsubscribe when removed."""
        self._sub_state = await subscription.async_unsubscribe_topics(
            self.hass, self._sub_state
        )
        await MqttAttributes.async_will_remove_from_hass(self)
        await MqttAvailability.async_will_remove_from_hass(self)

    @property
    def should_poll(self):
        """No polling needed."""
        return False

    @property
    def name(self):
        """Return the name of the device."""
        return self._config[CONF_NAME]

    @property
    def unique_id(self):
        """Return a unique ID."""
        return self._unique_id

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

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

    @property
    def code_arm_required(self):
        """Whether the code is required for arm actions."""
        code_required = self._config.get(CONF_CODE_ARM_REQUIRED)
        return code_required

    async def async_alarm_disarm(self, code=None):
        """Send disarm command.

        This method is a coroutine.
        """
        code_required = self._config[CONF_CODE_DISARM_REQUIRED]
        if code_required and not self._validate_code(code, "disarming"):
            return
        payload = self._config[CONF_PAYLOAD_DISARM]
        self._publish(code, payload)

    async def async_alarm_arm_home(self, code=None):
        """Send arm home command.

        This method is a coroutine.
        """
        code_required = self._config[CONF_CODE_ARM_REQUIRED]
        if code_required and not self._validate_code(code, "arming home"):
            return
        action = self._config[CONF_PAYLOAD_ARM_HOME]
        self._publish(code, action)

    async def async_alarm_arm_away(self, code=None):
        """Send arm away command.

        This method is a coroutine.
        """
        code_required = self._config[CONF_CODE_ARM_REQUIRED]
        if code_required and not self._validate_code(code, "arming away"):
            return
        action = self._config[CONF_PAYLOAD_ARM_AWAY]
        self._publish(code, action)

    async def async_alarm_arm_night(self, code=None):
        """Send arm night command.

        This method is a coroutine.
        """
        code_required = self._config[CONF_CODE_ARM_REQUIRED]
        if code_required and not self._validate_code(code, "arming night"):
            return
        action = self._config[CONF_PAYLOAD_ARM_NIGHT]
        self._publish(code, action)

    def _publish(self, code, action):
        """Publish via mqtt."""
        command_template = self._config[CONF_COMMAND_TEMPLATE]
        values = {"action": action, "code": code}
        payload = command_template.async_render(**values)
        mqtt.async_publish(
            self.hass,
            self._config[CONF_COMMAND_TOPIC],
            payload,
            self._config[CONF_QOS],
            self._config[CONF_RETAIN],
        )

    def _validate_code(self, code, state):
        """Validate given code."""
        conf_code = self._config.get(CONF_CODE)
        check = conf_code is None or code == conf_code
        if not check:
            _LOGGER.warning("Wrong code entered for %s", state)
        return check
