"""Diagnostic binary sensors per display (primary, DDC/CI power-control support)."""

from __future__ import annotations

import logging
from typing import Any

from homeassistant.components.binary_sensor import BinarySensorEntity
from homeassistant.config_entries import ConfigEntry
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity import EntityCategory
from homeassistant.helpers.entity_platform import AddEntitiesCallback

from .api_client import MediaServerClient, MediaServerError
from .const import DOMAIN
from .display_device import display_device_info

_LOGGER = logging.getLogger(__name__)


async def async_setup_entry(
    hass: HomeAssistant,
    entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up per-display binary sensor entities."""
    client: MediaServerClient = hass.data[DOMAIN][entry.entry_id]["client"]

    try:
        monitors = await client.get_display_monitors()
    except MediaServerError as err:
        _LOGGER.error("Failed to fetch display monitors: %s", err)
        return

    entities: list[Any] = []
    for monitor in monitors:
        entities.append(DisplayPrimaryBinarySensor(client, entry, monitor))
        entities.append(DisplayPowerControlBinarySensor(client, entry, monitor))

    if entities:
        async_add_entities(entities)
        _LOGGER.info("Added %d display binary sensor entities", len(entities))


class _DisplayBinarySensorBase(BinarySensorEntity):
    """Common boilerplate for per-display diagnostic binary sensors."""

    _attr_has_entity_name = True
    _attr_entity_category = EntityCategory.DIAGNOSTIC

    def __init__(
        self,
        client: MediaServerClient,
        entry: ConfigEntry,
        monitor: dict[str, Any],
    ) -> None:
        self._client = client
        self._monitor_id: int = monitor["id"]
        self._attr_device_info = display_device_info(entry, monitor)


class DisplayPrimaryBinarySensor(_DisplayBinarySensorBase):
    """Indicates whether the display is the OS primary monitor."""

    _attr_name = "Primary display"
    _attr_icon = "mdi:monitor-star"

    def __init__(
        self,
        client: MediaServerClient,
        entry: ConfigEntry,
        monitor: dict[str, Any],
    ) -> None:
        super().__init__(client, entry, monitor)
        self._attr_unique_id = f"{entry.entry_id}_display_primary_{self._monitor_id}"
        self._attr_is_on = bool(monitor.get("is_primary"))

    async def async_update(self) -> None:
        try:
            monitors = await self._client.get_display_monitors()
            for monitor in monitors:
                if monitor["id"] == self._monitor_id:
                    self._attr_is_on = bool(monitor.get("is_primary"))
                    break
        except MediaServerError as err:
            _LOGGER.error("Failed to refresh primary flag for monitor %d: %s", self._monitor_id, err)


class DisplayPowerControlBinarySensor(_DisplayBinarySensorBase):
    """Indicates whether DDC/CI power control is available for this display."""

    _attr_name = "Power control supported"
    _attr_icon = "mdi:power-plug"

    def __init__(
        self,
        client: MediaServerClient,
        entry: ConfigEntry,
        monitor: dict[str, Any],
    ) -> None:
        super().__init__(client, entry, monitor)
        self._attr_unique_id = f"{entry.entry_id}_display_power_supported_{self._monitor_id}"
        self._attr_is_on = bool(monitor.get("power_supported"))

    async def async_update(self) -> None:
        try:
            monitors = await self._client.get_display_monitors()
            for monitor in monitors:
                if monitor["id"] == self._monitor_id:
                    self._attr_is_on = bool(monitor.get("power_supported"))
                    break
        except MediaServerError as err:
            _LOGGER.error(
                "Failed to refresh power_supported flag for monitor %d: %s",
                self._monitor_id, err,
            )