core/homeassistant/components/template/__init__.py

"""The template component."""
from __future__ import annotations

import asyncio
import logging

from homeassistant import config as conf_util
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import CONF_UNIQUE_ID, SERVICE_RELOAD
from homeassistant.core import Event, HomeAssistant, ServiceCall
from homeassistant.exceptions import HomeAssistantError
from homeassistant.helpers import discovery
from homeassistant.helpers.reload import async_reload_integration_platforms
from homeassistant.helpers.service import async_register_admin_service
from homeassistant.helpers.typing import ConfigType
from homeassistant.loader import async_get_integration

from .const import CONF_TRIGGER, DOMAIN, PLATFORMS
from .coordinator import TriggerUpdateCoordinator

_LOGGER = logging.getLogger(__name__)


async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
    """Set up the template integration."""
    if DOMAIN in config:
        await _process_config(hass, config)

    async def _reload_config(call: Event | ServiceCall) -> None:
        """Reload top-level + platforms."""
        try:
            unprocessed_conf = await conf_util.async_hass_config_yaml(hass)
        except HomeAssistantError as err:
            _LOGGER.error(err)
            return

        integration = await async_get_integration(hass, DOMAIN)
        conf = await conf_util.async_process_component_and_handle_errors(
            hass, unprocessed_conf, integration
        )

        if conf is None:
            return

        await async_reload_integration_platforms(hass, DOMAIN, PLATFORMS)

        if DOMAIN in conf:
            await _process_config(hass, conf)

        hass.bus.async_fire(f"event_{DOMAIN}_reloaded", context=call.context)

    async_register_admin_service(hass, DOMAIN, SERVICE_RELOAD, _reload_config)

    return True


async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
    """Set up a config entry."""
    await hass.config_entries.async_forward_entry_setups(
        entry, (entry.options["template_type"],)
    )
    entry.async_on_unload(entry.add_update_listener(config_entry_update_listener))
    return True


async def config_entry_update_listener(hass: HomeAssistant, entry: ConfigEntry) -> None:
    """Update listener, called when the config entry options are changed."""
    await hass.config_entries.async_reload(entry.entry_id)


async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
    """Unload a config entry."""
    return await hass.config_entries.async_unload_platforms(
        entry, (entry.options["template_type"],)
    )


async def _process_config(hass: HomeAssistant, hass_config: ConfigType) -> None:
    """Process config."""
    coordinators: list[TriggerUpdateCoordinator] | None = hass.data.pop(DOMAIN, None)

    # Remove old ones
    if coordinators:
        for coordinator in coordinators:
            coordinator.async_remove()

    async def init_coordinator(hass, conf_section):
        coordinator = TriggerUpdateCoordinator(hass, conf_section)
        await coordinator.async_setup(hass_config)
        return coordinator

    coordinator_tasks = []

    for conf_section in hass_config[DOMAIN]:
        if CONF_TRIGGER in conf_section:
            coordinator_tasks.append(init_coordinator(hass, conf_section))
            continue

        for platform_domain in PLATFORMS:
            if platform_domain in conf_section:
                hass.async_create_task(
                    discovery.async_load_platform(
                        hass,
                        platform_domain,
                        DOMAIN,
                        {
                            "unique_id": conf_section.get(CONF_UNIQUE_ID),
                            "entities": conf_section[platform_domain],
                        },
                        hass_config,
                    )
                )

    if coordinator_tasks:
        hass.data[DOMAIN] = await asyncio.gather(*coordinator_tasks)