"""Support for covers which integrate with other components."""
import logging

import voluptuous as vol

from homeassistant.components.cover import (
    ATTR_POSITION,
    ATTR_TILT_POSITION,
    DEVICE_CLASSES_SCHEMA,
    ENTITY_ID_FORMAT,
    PLATFORM_SCHEMA,
    SUPPORT_CLOSE,
    SUPPORT_CLOSE_TILT,
    SUPPORT_OPEN,
    SUPPORT_OPEN_TILT,
    SUPPORT_SET_POSITION,
    SUPPORT_SET_TILT_POSITION,
    SUPPORT_STOP,
    SUPPORT_STOP_TILT,
    CoverEntity,
)
from homeassistant.const import (
    CONF_DEVICE_CLASS,
    CONF_ENTITY_ID,
    CONF_ENTITY_PICTURE_TEMPLATE,
    CONF_FRIENDLY_NAME,
    CONF_ICON_TEMPLATE,
    CONF_OPTIMISTIC,
    CONF_VALUE_TEMPLATE,
    EVENT_HOMEASSISTANT_START,
    MATCH_ALL,
    STATE_CLOSED,
    STATE_OPEN,
)
from homeassistant.core import callback
from homeassistant.exceptions import TemplateError
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.entity import async_generate_entity_id
from homeassistant.helpers.event import async_track_state_change_event
from homeassistant.helpers.script import Script

from . import extract_entities, initialise_templates
from .const import CONF_AVAILABILITY_TEMPLATE

_LOGGER = logging.getLogger(__name__)
_VALID_STATES = [STATE_OPEN, STATE_CLOSED, "true", "false"]

CONF_COVERS = "covers"

CONF_POSITION_TEMPLATE = "position_template"
CONF_TILT_TEMPLATE = "tilt_template"
OPEN_ACTION = "open_cover"
CLOSE_ACTION = "close_cover"
STOP_ACTION = "stop_cover"
POSITION_ACTION = "set_cover_position"
TILT_ACTION = "set_cover_tilt_position"
CONF_TILT_OPTIMISTIC = "tilt_optimistic"

CONF_VALUE_OR_POSITION_TEMPLATE = "value_or_position"
CONF_OPEN_OR_CLOSE = "open_or_close"

TILT_FEATURES = (
    SUPPORT_OPEN_TILT
    | SUPPORT_CLOSE_TILT
    | SUPPORT_STOP_TILT
    | SUPPORT_SET_TILT_POSITION
)

COVER_SCHEMA = vol.All(
    vol.Schema(
        {
            vol.Inclusive(OPEN_ACTION, CONF_OPEN_OR_CLOSE): cv.SCRIPT_SCHEMA,
            vol.Inclusive(CLOSE_ACTION, CONF_OPEN_OR_CLOSE): cv.SCRIPT_SCHEMA,
            vol.Optional(STOP_ACTION): cv.SCRIPT_SCHEMA,
            vol.Exclusive(
                CONF_POSITION_TEMPLATE, CONF_VALUE_OR_POSITION_TEMPLATE
            ): cv.template,
            vol.Exclusive(
                CONF_VALUE_TEMPLATE, CONF_VALUE_OR_POSITION_TEMPLATE
            ): cv.template,
            vol.Optional(CONF_AVAILABILITY_TEMPLATE): cv.template,
            vol.Optional(CONF_POSITION_TEMPLATE): cv.template,
            vol.Optional(CONF_TILT_TEMPLATE): cv.template,
            vol.Optional(CONF_ICON_TEMPLATE): cv.template,
            vol.Optional(CONF_ENTITY_PICTURE_TEMPLATE): cv.template,
            vol.Optional(CONF_DEVICE_CLASS): DEVICE_CLASSES_SCHEMA,
            vol.Optional(CONF_OPTIMISTIC): cv.boolean,
            vol.Optional(CONF_TILT_OPTIMISTIC): cv.boolean,
            vol.Optional(POSITION_ACTION): cv.SCRIPT_SCHEMA,
            vol.Optional(TILT_ACTION): cv.SCRIPT_SCHEMA,
            vol.Optional(CONF_FRIENDLY_NAME): cv.string,
            vol.Optional(CONF_ENTITY_ID): cv.entity_ids,
        }
    ),
    cv.has_at_least_one_key(OPEN_ACTION, POSITION_ACTION),
)

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {vol.Required(CONF_COVERS): cv.schema_with_slug_keys(COVER_SCHEMA)}
)


async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
    """Set up the Template cover."""
    covers = []

    for device, device_config in config[CONF_COVERS].items():
        state_template = device_config.get(CONF_VALUE_TEMPLATE)
        position_template = device_config.get(CONF_POSITION_TEMPLATE)
        tilt_template = device_config.get(CONF_TILT_TEMPLATE)
        icon_template = device_config.get(CONF_ICON_TEMPLATE)
        availability_template = device_config.get(CONF_AVAILABILITY_TEMPLATE)
        entity_picture_template = device_config.get(CONF_ENTITY_PICTURE_TEMPLATE)

        friendly_name = device_config.get(CONF_FRIENDLY_NAME, device)
        device_class = device_config.get(CONF_DEVICE_CLASS)
        open_action = device_config.get(OPEN_ACTION)
        close_action = device_config.get(CLOSE_ACTION)
        stop_action = device_config.get(STOP_ACTION)
        position_action = device_config.get(POSITION_ACTION)
        tilt_action = device_config.get(TILT_ACTION)
        optimistic = device_config.get(CONF_OPTIMISTIC)
        tilt_optimistic = device_config.get(CONF_TILT_OPTIMISTIC)

        templates = {
            CONF_VALUE_TEMPLATE: state_template,
            CONF_POSITION_TEMPLATE: position_template,
            CONF_TILT_TEMPLATE: tilt_template,
            CONF_ICON_TEMPLATE: icon_template,
            CONF_AVAILABILITY_TEMPLATE: availability_template,
            CONF_ENTITY_PICTURE_TEMPLATE: entity_picture_template,
        }

        initialise_templates(hass, templates)
        entity_ids = extract_entities(
            device, "cover", device_config.get(CONF_ENTITY_ID), templates
        )

        covers.append(
            CoverTemplate(
                hass,
                device,
                friendly_name,
                device_class,
                state_template,
                position_template,
                tilt_template,
                icon_template,
                entity_picture_template,
                availability_template,
                open_action,
                close_action,
                stop_action,
                position_action,
                tilt_action,
                optimistic,
                tilt_optimistic,
                entity_ids,
            )
        )

    async_add_entities(covers)


class CoverTemplate(CoverEntity):
    """Representation of a Template cover."""

    def __init__(
        self,
        hass,
        device_id,
        friendly_name,
        device_class,
        state_template,
        position_template,
        tilt_template,
        icon_template,
        entity_picture_template,
        availability_template,
        open_action,
        close_action,
        stop_action,
        position_action,
        tilt_action,
        optimistic,
        tilt_optimistic,
        entity_ids,
    ):
        """Initialize the Template cover."""
        self.hass = hass
        self.entity_id = async_generate_entity_id(
            ENTITY_ID_FORMAT, device_id, hass=hass
        )
        self._name = friendly_name
        self._template = state_template
        self._position_template = position_template
        self._tilt_template = tilt_template
        self._icon_template = icon_template
        self._device_class = device_class
        self._entity_picture_template = entity_picture_template
        self._availability_template = availability_template
        self._open_script = None
        if open_action is not None:
            self._open_script = Script(hass, open_action)
        self._close_script = None
        if close_action is not None:
            self._close_script = Script(hass, close_action)
        self._stop_script = None
        if stop_action is not None:
            self._stop_script = Script(hass, stop_action)
        self._position_script = None
        if position_action is not None:
            self._position_script = Script(hass, position_action)
        self._tilt_script = None
        if tilt_action is not None:
            self._tilt_script = Script(hass, tilt_action)
        self._optimistic = optimistic or (not state_template and not position_template)
        self._tilt_optimistic = tilt_optimistic or not tilt_template
        self._icon = None
        self._entity_picture = None
        self._position = None
        self._tilt_value = None
        self._entities = entity_ids
        self._available = True

    async def async_added_to_hass(self):
        """Register callbacks."""

        @callback
        def template_cover_state_listener(event):
            """Handle target device state changes."""
            self.async_schedule_update_ha_state(True)

        @callback
        def template_cover_startup(event):
            """Update template on startup."""
            if self._entities != MATCH_ALL:
                # Track state change only for valid templates
                async_track_state_change_event(
                    self.hass, self._entities, template_cover_state_listener
                )

            self.async_schedule_update_ha_state(True)

        self.hass.bus.async_listen_once(
            EVENT_HOMEASSISTANT_START, template_cover_startup
        )

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

    @property
    def is_closed(self):
        """Return if the cover is closed."""
        return self._position == 0

    @property
    def current_cover_position(self):
        """Return current position of cover.

        None is unknown, 0 is closed, 100 is fully open.
        """
        if self._position_template or self._position_script:
            return self._position
        return None

    @property
    def current_cover_tilt_position(self):
        """Return current position of cover tilt.

        None is unknown, 0 is closed, 100 is fully open.
        """
        return self._tilt_value

    @property
    def icon(self):
        """Return the icon to use in the frontend, if any."""
        return self._icon

    @property
    def entity_picture(self):
        """Return the entity picture to use in the frontend, if any."""
        return self._entity_picture

    @property
    def device_class(self):
        """Return the device class of the cover."""
        return self._device_class

    @property
    def supported_features(self):
        """Flag supported features."""
        supported_features = SUPPORT_OPEN | SUPPORT_CLOSE

        if self._stop_script is not None:
            supported_features |= SUPPORT_STOP

        if self._position_script is not None:
            supported_features |= SUPPORT_SET_POSITION

        if self._tilt_script is not None:
            supported_features |= TILT_FEATURES

        return supported_features

    @property
    def should_poll(self):
        """Return the polling state."""
        return False

    @property
    def available(self) -> bool:
        """Return if the device is available."""
        return self._available

    async def async_open_cover(self, **kwargs):
        """Move the cover up."""
        if self._open_script:
            await self._open_script.async_run(context=self._context)
        elif self._position_script:
            await self._position_script.async_run(
                {"position": 100}, context=self._context
            )
        if self._optimistic:
            self._position = 100
            self.async_write_ha_state()

    async def async_close_cover(self, **kwargs):
        """Move the cover down."""
        if self._close_script:
            await self._close_script.async_run(context=self._context)
        elif self._position_script:
            await self._position_script.async_run(
                {"position": 0}, context=self._context
            )
        if self._optimistic:
            self._position = 0
            self.async_write_ha_state()

    async def async_stop_cover(self, **kwargs):
        """Fire the stop action."""
        if self._stop_script:
            await self._stop_script.async_run(context=self._context)

    async def async_set_cover_position(self, **kwargs):
        """Set cover position."""
        self._position = kwargs[ATTR_POSITION]
        await self._position_script.async_run(
            {"position": self._position}, context=self._context
        )
        if self._optimistic:
            self.async_write_ha_state()

    async def async_open_cover_tilt(self, **kwargs):
        """Tilt the cover open."""
        self._tilt_value = 100
        await self._tilt_script.async_run(
            {"tilt": self._tilt_value}, context=self._context
        )
        if self._tilt_optimistic:
            self.async_write_ha_state()

    async def async_close_cover_tilt(self, **kwargs):
        """Tilt the cover closed."""
        self._tilt_value = 0
        await self._tilt_script.async_run(
            {"tilt": self._tilt_value}, context=self._context
        )
        if self._tilt_optimistic:
            self.async_write_ha_state()

    async def async_set_cover_tilt_position(self, **kwargs):
        """Move the cover tilt to a specific position."""
        self._tilt_value = kwargs[ATTR_TILT_POSITION]
        await self._tilt_script.async_run(
            {"tilt": self._tilt_value}, context=self._context
        )
        if self._tilt_optimistic:
            self.async_write_ha_state()

    async def async_update(self):
        """Update the state from the template."""
        if self._template is not None:
            try:
                state = self._template.async_render().lower()
                if state in _VALID_STATES:
                    if state in ("true", STATE_OPEN):
                        self._position = 100
                    else:
                        self._position = 0
                else:
                    _LOGGER.error(
                        "Received invalid cover is_on state: %s. Expected: %s",
                        state,
                        ", ".join(_VALID_STATES),
                    )
                    self._position = None
            except TemplateError as ex:
                _LOGGER.error(ex)
                self._position = None
        if self._position_template is not None:
            try:
                state = float(self._position_template.async_render())
                if state < 0 or state > 100:
                    self._position = None
                    _LOGGER.error(
                        "Cover position value must be"
                        " between 0 and 100."
                        " Value was: %.2f",
                        state,
                    )
                else:
                    self._position = state
            except (TemplateError, ValueError) as err:
                _LOGGER.error(err)
                self._position = None
        if self._tilt_template is not None:
            try:
                state = float(self._tilt_template.async_render())
                if state < 0 or state > 100:
                    self._tilt_value = None
                    _LOGGER.error(
                        "Tilt value must be between 0 and 100. Value was: %.2f", state,
                    )
                else:
                    self._tilt_value = state
            except (TemplateError, ValueError) as err:
                _LOGGER.error(err)
                self._tilt_value = None

        for property_name, template in (
            ("_icon", self._icon_template),
            ("_entity_picture", self._entity_picture_template),
            ("_available", self._availability_template),
        ):
            if template is None:
                continue

            try:
                value = template.async_render()
                if property_name == "_available":
                    value = value.lower() == "true"
                setattr(self, property_name, value)
            except TemplateError as ex:
                friendly_property_name = property_name[1:].replace("_", " ")
                if ex.args and ex.args[0].startswith(
                    "UndefinedError: 'None' has no attribute"
                ):
                    # Common during HA startup - so just a warning
                    _LOGGER.warning(
                        "Could not render %s template %s, the state is unknown",
                        friendly_property_name,
                        self._name,
                    )
                    return

                try:
                    setattr(self, property_name, getattr(super(), property_name))
                except AttributeError:
                    _LOGGER.error(
                        "Could not render %s template %s: %s",
                        friendly_property_name,
                        self._name,
                        ex,
                    )
