"""Diagnostic sensors exposed per display (resolution, etc.)."""

from __future__ import annotations

import logging
from typing import Any

from homeassistant.components.sensor import SensorEntity
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 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 = [
        DisplayResolutionSensor(client, entry, monitor)
        for monitor in monitors
        if monitor.get("resolution")
    ]

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


class DisplayResolutionSensor(SensorEntity):
    """Diagnostic sensor reporting the EDID-derived display resolution."""

    _attr_has_entity_name = True
    _attr_name = "Resolution"
    _attr_entity_category = EntityCategory.DIAGNOSTIC
    _attr_icon = "mdi:monitor-screenshot"

    def __init__(
        self,
        client: MediaServerClient,
        entry: ConfigEntry,
        monitor: dict[str, Any],
    ) -> None:
        """Initialize the display resolution sensor."""
        self._client = client
        self._monitor_id: int = monitor["id"]
        self._attr_native_value = monitor.get("resolution")
        self._attr_unique_id = f"{entry.entry_id}_display_resolution_{self._monitor_id}"
        self._attr_device_info = display_device_info(entry, monitor)

    async def async_update(self) -> None:
        """Refresh resolution from the server (rarely changes)."""
        try:
            monitors = await self._client.get_display_monitors()
            for monitor in monitors:
                if monitor["id"] == self._monitor_id:
                    self._attr_native_value = monitor.get("resolution")
                    break
        except MediaServerError as err:
            _LOGGER.error("Failed to refresh resolution for monitor %d: %s", self._monitor_id, err)