"""Component to embed TP-Link smart home devices."""
from __future__ import annotations

import asyncio
from datetime import timedelta
from typing import Any

from kasa import SmartDevice, SmartDeviceException
from kasa.discover import Discover

from homeassistant import config_entries
from homeassistant.components import network
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import (
    CONF_HOST,
    CONF_MAC,
    CONF_NAME,
    EVENT_HOMEASSISTANT_STARTED,
)
from homeassistant.core import HomeAssistant, callback
from homeassistant.exceptions import ConfigEntryNotReady
from homeassistant.helpers import device_registry as dr, discovery_flow
from homeassistant.helpers.event import async_track_time_interval
from homeassistant.helpers.typing import ConfigType

from .const import DOMAIN, PLATFORMS
from .coordinator import TPLinkDataUpdateCoordinator

DISCOVERY_INTERVAL = timedelta(minutes=15)


@callback
def async_trigger_discovery(
    hass: HomeAssistant,
    discovered_devices: dict[str, SmartDevice],
) -> None:
    """Trigger config flows for discovered devices."""
    for formatted_mac, device in discovered_devices.items():
        discovery_flow.async_create_flow(
            hass,
            DOMAIN,
            context={"source": config_entries.SOURCE_INTEGRATION_DISCOVERY},
            data={
                CONF_NAME: device.alias,
                CONF_HOST: device.host,
                CONF_MAC: formatted_mac,
            },
        )


async def async_discover_devices(hass: HomeAssistant) -> dict[str, SmartDevice]:
    """Discover TPLink devices on configured network interfaces."""
    broadcast_addresses = await network.async_get_ipv4_broadcast_addresses(hass)
    tasks = [Discover.discover(target=str(address)) for address in broadcast_addresses]
    discovered_devices: dict[str, SmartDevice] = {}
    for device_list in await asyncio.gather(*tasks):
        for device in device_list.values():
            discovered_devices[dr.format_mac(device.mac)] = device
    return discovered_devices


async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
    """Set up the TP-Link component."""
    hass.data[DOMAIN] = {}

    if discovered_devices := await async_discover_devices(hass):
        async_trigger_discovery(hass, discovered_devices)

    async def _async_discovery(*_: Any) -> None:
        if discovered := await async_discover_devices(hass):
            async_trigger_discovery(hass, discovered)

    hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STARTED, _async_discovery)
    async_track_time_interval(hass, _async_discovery, DISCOVERY_INTERVAL)

    return True


async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
    """Set up TPLink from a config entry."""
    try:
        device: SmartDevice = await Discover.discover_single(entry.data[CONF_HOST])
    except SmartDeviceException as ex:
        raise ConfigEntryNotReady from ex

    hass.data[DOMAIN][entry.entry_id] = TPLinkDataUpdateCoordinator(hass, device)
    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)

    return True


async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
    """Unload a config entry."""
    hass_data: dict[str, Any] = hass.data[DOMAIN]
    device: SmartDevice = hass_data[entry.entry_id].device
    if unload_ok := await hass.config_entries.async_unload_platforms(entry, PLATFORMS):
        hass_data.pop(entry.entry_id)
    await device.protocol.close()
    return unload_ok


def legacy_device_id(device: SmartDevice) -> str:
    """Convert the device id so it matches what was used in the original version."""
    device_id: str = device.device_id
    # Plugs are prefixed with the mac in python-kasa but not
    # in pyHS100 so we need to strip off the mac
    if "_" not in device_id:
        return device_id
    return device_id.split("_")[1]
