"""Config flow for WiZ Platform."""
from __future__ import annotations

import logging
from typing import Any

from pywizlight import wizlight
from pywizlight.discovery import DiscoveredBulb
from pywizlight.exceptions import WizLightConnectionError, WizLightTimeOutError
import voluptuous as vol

from homeassistant import config_entries
from homeassistant.components import dhcp
from homeassistant.const import CONF_HOST
from homeassistant.data_entry_flow import AbortFlow, FlowResult
from homeassistant.util.network import is_ip_address

from .const import DEFAULT_NAME, DISCOVER_SCAN_TIMEOUT, DOMAIN, WIZ_CONNECT_EXCEPTIONS
from .discovery import async_discover_devices
from .utils import _short_mac, name_from_bulb_type_and_mac

_LOGGER = logging.getLogger(__name__)

CONF_DEVICE = "device"


class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
    """Handle a config flow for WiZ."""

    VERSION = 1

    def __init__(self) -> None:
        """Initialize the config flow."""
        self._discovered_device: DiscoveredBulb | None = None
        self._discovered_devices: dict[str, DiscoveredBulb] = {}
        self._name: str | None = None

    async def async_step_dhcp(self, discovery_info: dhcp.DhcpServiceInfo) -> FlowResult:
        """Handle discovery via dhcp."""
        self._discovered_device = DiscoveredBulb(
            discovery_info.ip, discovery_info.macaddress
        )
        return await self._async_handle_discovery()

    async def async_step_integration_discovery(
        self, discovery_info: dict[str, str]
    ) -> FlowResult:
        """Handle integration discovery."""
        self._discovered_device = DiscoveredBulb(
            discovery_info["ip_address"], discovery_info["mac_address"]
        )
        return await self._async_handle_discovery()

    async def _async_handle_discovery(self) -> FlowResult:
        """Handle any discovery."""
        device = self._discovered_device
        assert device is not None
        _LOGGER.debug("Discovered device: %s", device)
        ip_address = device.ip_address
        mac = device.mac_address
        await self.async_set_unique_id(mac)
        self._abort_if_unique_id_configured(updates={CONF_HOST: ip_address})
        await self._async_connect_discovered_or_abort()
        return await self.async_step_discovery_confirm()

    async def _async_connect_discovered_or_abort(self) -> None:
        """Connect to the device and verify its responding."""
        device = self._discovered_device
        assert device is not None
        bulb = wizlight(device.ip_address)
        try:
            bulbtype = await bulb.get_bulbtype()
        except WIZ_CONNECT_EXCEPTIONS as ex:
            _LOGGER.debug(
                "Failed to connect to %s during discovery: %s",
                device.ip_address,
                ex,
                exc_info=True,
            )
            raise AbortFlow("cannot_connect") from ex
        self._name = name_from_bulb_type_and_mac(bulbtype, device.mac_address)

    async def async_step_discovery_confirm(
        self, user_input: dict[str, Any] | None = None
    ) -> FlowResult:
        """Confirm discovery."""
        assert self._discovered_device is not None
        assert self._name is not None
        ip_address = self._discovered_device.ip_address
        if user_input is not None:
            # Make sure the device is still there and
            # update the name if the firmware has auto
            # updated since discovery
            await self._async_connect_discovered_or_abort()
            return self.async_create_entry(
                title=self._name,
                data={CONF_HOST: ip_address},
            )

        self._set_confirm_only()
        placeholders = {"name": self._name, "host": ip_address}
        self.context["title_placeholders"] = placeholders
        return self.async_show_form(
            step_id="discovery_confirm",
            description_placeholders=placeholders,
        )

    async def async_step_pick_device(
        self, user_input: dict[str, Any] | None = None
    ) -> FlowResult:
        """Handle the step to pick discovered device."""
        if user_input is not None:
            device = self._discovered_devices[user_input[CONF_DEVICE]]
            await self.async_set_unique_id(device.mac_address, raise_on_progress=False)
            bulb = wizlight(device.ip_address)
            try:
                bulbtype = await bulb.get_bulbtype()
            except WIZ_CONNECT_EXCEPTIONS:
                return self.async_abort(reason="cannot_connect")
            else:
                return self.async_create_entry(
                    title=name_from_bulb_type_and_mac(bulbtype, device.mac_address),
                    data={CONF_HOST: device.ip_address},
                )

        current_unique_ids = self._async_current_ids()
        current_hosts = {
            entry.data[CONF_HOST]
            for entry in self._async_current_entries(include_ignore=False)
        }
        discovered_devices = await async_discover_devices(
            self.hass, DISCOVER_SCAN_TIMEOUT
        )
        self._discovered_devices = {
            device.mac_address: device for device in discovered_devices
        }
        devices_name = {
            mac: f"{DEFAULT_NAME} {_short_mac(mac)} ({device.ip_address})"
            for mac, device in self._discovered_devices.items()
            if mac not in current_unique_ids and device.ip_address not in current_hosts
        }
        # Check if there is at least one device
        if not devices_name:
            return self.async_abort(reason="no_devices_found")
        return self.async_show_form(
            step_id="pick_device",
            data_schema=vol.Schema({vol.Required(CONF_DEVICE): vol.In(devices_name)}),
        )

    async def async_step_user(
        self, user_input: dict[str, Any] | None = None
    ) -> FlowResult:
        """Handle a flow initialized by the user."""
        errors = {}
        if user_input is not None:
            if not (host := user_input[CONF_HOST]):
                return await self.async_step_pick_device()
            if not is_ip_address(user_input[CONF_HOST]):
                errors["base"] = "no_ip"
            else:
                bulb = wizlight(host)
                try:
                    bulbtype = await bulb.get_bulbtype()
                    mac = await bulb.getMac()
                except WizLightTimeOutError:
                    errors["base"] = "bulb_time_out"
                except ConnectionRefusedError:
                    errors["base"] = "cannot_connect"
                except WizLightConnectionError:
                    errors["base"] = "no_wiz_light"
                except Exception:  # pylint: disable=broad-except
                    _LOGGER.exception("Unexpected exception")
                    errors["base"] = "unknown"
                else:
                    await self.async_set_unique_id(mac, raise_on_progress=False)
                    self._abort_if_unique_id_configured(
                        updates={CONF_HOST: user_input[CONF_HOST]}
                    )
                    name = name_from_bulb_type_and_mac(bulbtype, mac)
                    return self.async_create_entry(
                        title=name,
                        data=user_input,
                    )

        return self.async_show_form(
            step_id="user",
            data_schema=vol.Schema({vol.Optional(CONF_HOST, default=""): str}),
            errors=errors,
        )