"""Number platform for Remote Media Player integration (display brightness)."""

from __future__ import annotations

import logging
from typing import Any

from homeassistant.components.number import NumberEntity, NumberMode
from homeassistant.config_entries import ConfigEntry
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.update_coordinator import CoordinatorEntity

from .api_client import MediaServerClient, MediaServerError
from .const import DOMAIN
from .display_coordinator import DisplayCoordinator
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 display brightness + contrast number entities from a config entry."""
    data = hass.data[DOMAIN][entry.entry_id]
    client: MediaServerClient = data["client"]
    coordinator: DisplayCoordinator = data["display_coordinator"]

    if not coordinator.data:
        return

    entities: list[Any] = []
    for monitor in coordinator.data.values():
        if monitor.get("brightness") is not None:
            entities.append(DisplayBrightnessNumber(coordinator, client, entry, monitor))
        if monitor.get("contrast_supported"):
            entities.append(DisplayContrastNumber(coordinator, client, entry, monitor))

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


class _DisplayNumberBase(CoordinatorEntity[DisplayCoordinator], NumberEntity):
    """Shared boilerplate for per-display number entities."""

    _attr_has_entity_name = True
    _attr_native_min_value = 0
    _attr_native_max_value = 100
    _attr_native_step = 1
    _attr_native_unit_of_measurement = "%"
    _attr_mode = NumberMode.SLIDER

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

    @property
    def _monitor(self) -> dict[str, Any]:
        if self.coordinator.data is None:
            return {}
        return self.coordinator.data.get(self._monitor_id, {})


class DisplayBrightnessNumber(_DisplayNumberBase):
    """Number entity for controlling display brightness."""

    _attr_translation_key = "brightness"
    _attr_icon = "mdi:brightness-6"

    def __init__(
        self,
        coordinator: DisplayCoordinator,
        client: MediaServerClient,
        entry: ConfigEntry,
        monitor: dict[str, Any],
    ) -> None:
        super().__init__(coordinator, client, entry, monitor)
        self._attr_unique_id = f"{entry.entry_id}_display_brightness_{self._monitor_id}"

    @property
    def native_value(self) -> float | None:
        value = self._monitor.get("brightness")
        return None if value is None else float(value)

    async def async_set_native_value(self, value: float) -> None:
        try:
            await self._client.set_display_brightness(self._monitor_id, int(value))
        except MediaServerError as err:
            _LOGGER.error("Failed to set brightness for monitor %d: %s", self._monitor_id, err)
            return
        self.coordinator.apply_optimistic(self._monitor_id, brightness=int(value))


class DisplayContrastNumber(_DisplayNumberBase):
    """Number entity for controlling DDC/CI display contrast."""

    _attr_translation_key = "contrast"
    _attr_icon = "mdi:contrast-circle"

    def __init__(
        self,
        coordinator: DisplayCoordinator,
        client: MediaServerClient,
        entry: ConfigEntry,
        monitor: dict[str, Any],
    ) -> None:
        super().__init__(coordinator, client, entry, monitor)
        self._attr_unique_id = f"{entry.entry_id}_display_contrast_{self._monitor_id}"

    @property
    def native_value(self) -> float | None:
        value = self._monitor.get("contrast")
        return None if value is None else float(value)

    async def async_set_native_value(self, value: float) -> None:
        try:
            result = await self._client.set_display_contrast(self._monitor_id, int(value))
        except MediaServerError as err:
            _LOGGER.error("Failed to set contrast for monitor %d: %s", self._monitor_id, err)
            return
        if not result.get("success"):
            # DDC/CI silently dropped the write — pull authoritative state from
            # the server instead of trusting our optimistic value.
            _LOGGER.warning(
                "Monitor %d rejected contrast %d (DDC/CI silently dropped)",
                self._monitor_id, int(value),
            )
            await self.coordinator.async_request_refresh()
            return
        self.coordinator.apply_optimistic(self._monitor_id, contrast=int(value))