"""Provides functionality to interact with image processing services."""
from __future__ import annotations

import asyncio
from dataclasses import dataclass
from datetime import timedelta
from enum import StrEnum
import logging
from typing import Any, Final, TypedDict, final

import voluptuous as vol

from homeassistant.components.camera import Image
from homeassistant.const import (
    ATTR_ENTITY_ID,
    ATTR_NAME,
    CONF_ENTITY_ID,
    CONF_NAME,
    CONF_SOURCE,
)
from homeassistant.core import HomeAssistant, ServiceCall, callback
from homeassistant.exceptions import HomeAssistantError
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.config_validation import make_entity_service_schema
from homeassistant.helpers.entity import Entity, EntityDescription
from homeassistant.helpers.entity_component import EntityComponent
from homeassistant.helpers.typing import ConfigType
from homeassistant.util.async_ import run_callback_threadsafe

_LOGGER = logging.getLogger(__name__)

DOMAIN = "image_processing"
SCAN_INTERVAL = timedelta(seconds=10)


class ImageProcessingDeviceClass(StrEnum):
    """Device class for image processing entities."""

    # Automatic license plate recognition
    ALPR = "alpr"

    # Face
    FACE = "face"

    # OCR
    OCR = "ocr"


SERVICE_SCAN = "scan"

EVENT_DETECT_FACE = "image_processing.detect_face"

ATTR_AGE = "age"
ATTR_CONFIDENCE: Final = "confidence"
ATTR_FACES = "faces"
ATTR_GENDER = "gender"
ATTR_GLASSES = "glasses"
ATTR_MOTION: Final = "motion"
ATTR_TOTAL_FACES = "total_faces"

CONF_CONFIDENCE = "confidence"

DEFAULT_TIMEOUT = 10
DEFAULT_CONFIDENCE = 80

SOURCE_SCHEMA = vol.Schema(
    {
        vol.Required(CONF_ENTITY_ID): cv.entity_domain("camera"),
        vol.Optional(CONF_NAME): cv.string,
    }
)

PLATFORM_SCHEMA = cv.PLATFORM_SCHEMA.extend(
    {
        vol.Optional(CONF_SOURCE): vol.All(cv.ensure_list, [SOURCE_SCHEMA]),
        vol.Optional(CONF_CONFIDENCE, default=DEFAULT_CONFIDENCE): vol.All(
            vol.Coerce(float), vol.Range(min=0, max=100)
        ),
    }
)
PLATFORM_SCHEMA_BASE = cv.PLATFORM_SCHEMA_BASE.extend(PLATFORM_SCHEMA.schema)


class FaceInformation(TypedDict, total=False):
    """Face information."""

    confidence: float
    name: str
    age: float
    gender: str
    motion: str
    glasses: str
    entity_id: str


async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
    """Set up the image processing."""
    component = EntityComponent[ImageProcessingEntity](
        _LOGGER, DOMAIN, hass, SCAN_INTERVAL
    )

    await component.async_setup(config)

    async def async_scan_service(service: ServiceCall) -> None:
        """Service handler for scan."""
        image_entities = await component.async_extract_from_service(service)

        update_tasks = []
        for entity in image_entities:
            entity.async_set_context(service.context)
            update_tasks.append(asyncio.create_task(entity.async_update_ha_state(True)))

        if update_tasks:
            await asyncio.wait(update_tasks)

    hass.services.async_register(
        DOMAIN, SERVICE_SCAN, async_scan_service, schema=make_entity_service_schema({})
    )

    return True


@dataclass
class ImageProcessingEntityDescription(EntityDescription):
    """A class that describes sensor entities."""

    device_class: ImageProcessingDeviceClass | None = None
    camera_entity: str | None = None
    confidence: float | None = None


class ImageProcessingEntity(Entity):
    """Base entity class for image processing."""

    entity_description: ImageProcessingEntityDescription
    _attr_device_class: ImageProcessingDeviceClass | None
    _attr_camera_entity: str | None
    _attr_confidence: float | None
    timeout = DEFAULT_TIMEOUT

    @property
    def camera_entity(self) -> str | None:
        """Return camera entity id from process pictures."""
        if hasattr(self, "_attr_camera_entity"):
            return self._attr_camera_entity
        if hasattr(self, "entity_description"):
            return self.entity_description.camera_entity
        return None

    @property
    def confidence(self) -> float | None:
        """Return minimum confidence to do some things."""
        if hasattr(self, "_attr_confidence"):
            return self._attr_confidence
        if hasattr(self, "entity_description"):
            return self.entity_description.confidence
        return None

    @property
    def device_class(self) -> ImageProcessingDeviceClass | None:
        """Return the class of this entity."""
        if hasattr(self, "_attr_device_class"):
            return self._attr_device_class
        if hasattr(self, "entity_description"):
            return self.entity_description.device_class
        return None

    def process_image(self, image: bytes) -> None:
        """Process image."""
        raise NotImplementedError()

    async def async_process_image(self, image: bytes) -> None:
        """Process image."""
        return await self.hass.async_add_executor_job(self.process_image, image)

    async def async_update(self) -> None:
        """Update image and process it.

        This method is a coroutine.
        """
        camera = self.hass.components.camera

        try:
            image: Image = await camera.async_get_image(
                self.camera_entity, timeout=self.timeout
            )

        except HomeAssistantError as err:
            _LOGGER.error("Error on receive image from entity: %s", err)
            return

        # process image data
        await self.async_process_image(image.content)


class ImageProcessingFaceEntity(ImageProcessingEntity):
    """Base entity class for face image processing."""

    _attr_device_class = ImageProcessingDeviceClass.FACE

    def __init__(self) -> None:
        """Initialize base face identify/verify entity."""
        self.faces: list[FaceInformation] = []
        self.total_faces = 0

    @property
    def state(self) -> str | int | None:
        """Return the state of the entity."""
        confidence: float = 0
        state = None

        # No confidence support
        if not self.confidence:
            return self.total_faces

        # Search high confidence
        for face in self.faces:
            if ATTR_CONFIDENCE not in face:
                continue

            if (f_co := face[ATTR_CONFIDENCE]) > confidence:
                confidence = f_co
                for attr in (ATTR_NAME, ATTR_MOTION):
                    if attr in face:
                        state = face[attr]  # type: ignore[literal-required]
                        break

        return state

    @final
    @property
    def state_attributes(self) -> dict[str, Any]:
        """Return device specific state attributes."""
        return {ATTR_FACES: self.faces, ATTR_TOTAL_FACES: self.total_faces}

    def process_faces(self, faces: list[FaceInformation], total: int) -> None:
        """Send event with detected faces and store data."""
        run_callback_threadsafe(
            self.hass.loop, self.async_process_faces, faces, total
        ).result()

    @callback
    def async_process_faces(self, faces: list[FaceInformation], total: int) -> None:
        """Send event with detected faces and store data.

        known are a dict in follow format:
         [
           {
              ATTR_CONFIDENCE: 80,
              ATTR_NAME: 'Name',
              ATTR_AGE: 12.0,
              ATTR_GENDER: 'man',
              ATTR_MOTION: 'smile',
              ATTR_GLASSES: 'sunglasses'
           },
         ]

        This method must be run in the event loop.
        """
        # Send events
        for face in faces:
            if (
                ATTR_CONFIDENCE in face
                and self.confidence
                and face[ATTR_CONFIDENCE] < self.confidence
            ):
                continue

            face.update({ATTR_ENTITY_ID: self.entity_id})
            self.hass.async_add_job(self.hass.bus.async_fire, EVENT_DETECT_FACE, face)

        # Update entity store
        self.faces = faces
        self.total_faces = total
