"""Support for MQTT images."""

from __future__ import annotations

from base64 import b64decode
import binascii
from collections.abc import Callable
import logging
from typing import TYPE_CHECKING, Any

import httpx
import voluptuous as vol

from homeassistant.components import image
from homeassistant.components.image import DEFAULT_CONTENT_TYPE, ImageEntity
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import CONF_NAME
from homeassistant.core import HomeAssistant, callback
from homeassistant.helpers import config_validation as cv
from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
from homeassistant.helpers.httpx_client import get_async_client
from homeassistant.helpers.service_info.mqtt import ReceivePayloadType
from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType, VolSchemaType
from homeassistant.util import dt as dt_util

from . import subscription
from .config import MQTT_BASE_SCHEMA
from .const import (
    CONF_CONTENT_TYPE,
    CONF_IMAGE_ENCODING,
    CONF_IMAGE_TOPIC,
    CONF_URL_TEMPLATE,
    CONF_URL_TOPIC,
)
from .entity import MqttEntity, async_setup_entity_entry_helper
from .models import (
    DATA_MQTT,
    MqttValueTemplate,
    MqttValueTemplateException,
    ReceiveMessage,
)
from .schemas import MQTT_ENTITY_COMMON_SCHEMA
from .util import valid_subscribe_topic

_LOGGER = logging.getLogger(__name__)

PARALLEL_UPDATES = 0

DEFAULT_NAME = "MQTT Image"

GET_IMAGE_TIMEOUT = 10


def validate_topic_required(config: ConfigType) -> ConfigType:
    """Ensure at least one subscribe topic is configured."""
    if CONF_IMAGE_TOPIC not in config and CONF_URL_TOPIC not in config:
        raise vol.Invalid("Expected one of [`image_topic`, `url_topic`], got none")
    if CONF_CONTENT_TYPE in config and CONF_URL_TOPIC in config:
        raise vol.Invalid(
            "Option `content_type` can not be used together with `url_topic`"
        )
    return config


PLATFORM_SCHEMA_BASE = MQTT_BASE_SCHEMA.extend(
    {
        vol.Optional(CONF_CONTENT_TYPE): cv.string,
        vol.Optional(CONF_NAME): vol.Any(cv.string, None),
        vol.Exclusive(CONF_URL_TOPIC, "image_topic"): valid_subscribe_topic,
        vol.Exclusive(CONF_IMAGE_TOPIC, "image_topic"): valid_subscribe_topic,
        vol.Optional(CONF_IMAGE_ENCODING): vol.In({"b64", "raw"}),
        vol.Optional(CONF_URL_TEMPLATE): cv.template,
    }
).extend(MQTT_ENTITY_COMMON_SCHEMA.schema)

PLATFORM_SCHEMA_MODERN = vol.All(PLATFORM_SCHEMA_BASE.schema, validate_topic_required)

DISCOVERY_SCHEMA = vol.All(
    PLATFORM_SCHEMA_BASE.extend({}, extra=vol.REMOVE_EXTRA), validate_topic_required
)


async def async_setup_entry(
    hass: HomeAssistant,
    config_entry: ConfigEntry,
    async_add_entities: AddConfigEntryEntitiesCallback,
) -> None:
    """Set up MQTT image through YAML and through MQTT discovery."""
    async_setup_entity_entry_helper(
        hass,
        config_entry,
        MqttImage,
        image.DOMAIN,
        async_add_entities,
        DISCOVERY_SCHEMA,
        PLATFORM_SCHEMA_MODERN,
    )


class MqttImage(MqttEntity, ImageEntity):
    """representation of a MQTT image."""

    _default_name = DEFAULT_NAME
    _entity_id_format: str = image.ENTITY_ID_FORMAT
    _last_image: bytes | None = None
    _client: httpx.AsyncClient
    _url_template: Callable[[ReceivePayloadType], ReceivePayloadType]
    _topic: dict[str, Any]

    def __init__(
        self,
        hass: HomeAssistant,
        config: ConfigType,
        config_entry: ConfigEntry,
        discovery_data: DiscoveryInfoType | None,
    ) -> None:
        """Initialize the MQTT Image."""
        self._client = get_async_client(hass)
        ImageEntity.__init__(self, hass)
        MqttEntity.__init__(self, hass, config, config_entry, discovery_data)

    @staticmethod
    def config_schema() -> VolSchemaType:
        """Return the config schema."""
        return DISCOVERY_SCHEMA

    def _setup_from_config(self, config: ConfigType) -> None:
        """(Re)Setup the entity."""
        self._topic = {
            key: config.get(key)
            for key in (
                CONF_IMAGE_TOPIC,
                CONF_URL_TOPIC,
            )
        }
        if CONF_IMAGE_TOPIC in config:
            self._attr_content_type = config.get(
                CONF_CONTENT_TYPE, DEFAULT_CONTENT_TYPE
            )
        if CONF_URL_TOPIC in config:
            self._attr_image_url = None
        self._url_template = MqttValueTemplate(
            config.get(CONF_URL_TEMPLATE), entity=self
        ).async_render_with_possible_json_value

    @callback
    def _image_data_received(self, msg: ReceiveMessage) -> None:
        """Handle new MQTT messages."""
        try:
            if self._config.get(CONF_IMAGE_ENCODING) == "b64":
                self._last_image = b64decode(msg.payload)
            else:
                if TYPE_CHECKING:
                    assert isinstance(msg.payload, bytes)
                self._last_image = msg.payload
        except (binascii.Error, ValueError, AssertionError) as err:
            _LOGGER.error(
                "Error processing image data received at topic %s: %s",
                msg.topic,
                err,
            )
            self._last_image = None
        self._attr_image_last_updated = dt_util.utcnow()
        self.hass.data[DATA_MQTT].state_write_requests.write_state_request(self)

    @callback
    def _image_from_url_request_received(self, msg: ReceiveMessage) -> None:
        """Handle new MQTT messages."""
        try:
            url = cv.url(self._url_template(msg.payload))
            self._attr_image_url = url
        except MqttValueTemplateException as exc:
            _LOGGER.warning(exc)
            return
        except vol.Invalid:
            _LOGGER.error(
                "Invalid image URL '%s' received at topic %s",
                msg.payload,
                msg.topic,
            )
        self._attr_image_last_updated = dt_util.utcnow()
        self._cached_image = None
        self.hass.data[DATA_MQTT].state_write_requests.write_state_request(self)

    @callback
    def _prepare_subscribe_topics(self) -> None:
        """(Re)Subscribe to topics."""
        self.add_subscription(
            CONF_IMAGE_TOPIC, self._image_data_received, None, disable_encoding=True
        )
        self.add_subscription(
            CONF_URL_TOPIC, self._image_from_url_request_received, None
        )

    async def _subscribe_topics(self) -> None:
        """(Re)Subscribe to topics."""
        subscription.async_subscribe_topics_internal(self.hass, self._sub_state)

    async def async_image(self) -> bytes | None:
        """Return bytes of image."""
        if CONF_IMAGE_TOPIC in self._config:
            return self._last_image
        return await super().async_image()
