"""Config flow for Samsung TV."""
import socket
from urllib.parse import urlparse

import getmac
import voluptuous as vol

from homeassistant import config_entries, data_entry_flow
from homeassistant.components.dhcp import IP_ADDRESS, MAC_ADDRESS
from homeassistant.components.ssdp import (
    ATTR_SSDP_LOCATION,
    ATTR_UPNP_MANUFACTURER,
    ATTR_UPNP_MODEL_NAME,
    ATTR_UPNP_UDN,
)
from homeassistant.const import (
    CONF_HOST,
    CONF_MAC,
    CONF_METHOD,
    CONF_NAME,
    CONF_PORT,
    CONF_TOKEN,
)
from homeassistant.core import callback
from homeassistant.helpers.device_registry import format_mac
from homeassistant.helpers.typing import DiscoveryInfoType

from .bridge import SamsungTVBridge, async_get_device_info, mac_from_device_info
from .const import (
    ATTR_PROPERTIES,
    CONF_MANUFACTURER,
    CONF_MODEL,
    DEFAULT_MANUFACTURER,
    DOMAIN,
    LEGACY_PORT,
    LOGGER,
    METHOD_LEGACY,
    METHOD_WEBSOCKET,
    RESULT_AUTH_MISSING,
    RESULT_CANNOT_CONNECT,
    RESULT_NOT_SUPPORTED,
    RESULT_SUCCESS,
    RESULT_UNKNOWN_HOST,
    WEBSOCKET_PORTS,
)

DATA_SCHEMA = vol.Schema({vol.Required(CONF_HOST): str, vol.Required(CONF_NAME): str})
SUPPORTED_METHODS = [METHOD_LEGACY, METHOD_WEBSOCKET]


def _strip_uuid(udn):
    return udn[5:] if udn.startswith("uuid:") else udn


def _entry_is_complete(entry):
    """Return True if the config entry information is complete."""
    return bool(entry.unique_id and entry.data.get(CONF_MAC))


class SamsungTVConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
    """Handle a Samsung TV config flow."""

    VERSION = 2

    def __init__(self):
        """Initialize flow."""
        self._reauth_entry = None
        self._host = None
        self._mac = None
        self._udn = None
        self._manufacturer = None
        self._model = None
        self._name = None
        self._title = None
        self._id = None
        self._bridge = None
        self._device_info = None

    def _get_entry_from_bridge(self):
        """Get device entry."""
        data = {
            CONF_HOST: self._host,
            CONF_MAC: self._mac,
            CONF_MANUFACTURER: self._manufacturer or DEFAULT_MANUFACTURER,
            CONF_METHOD: self._bridge.method,
            CONF_MODEL: self._model,
            CONF_NAME: self._name,
            CONF_PORT: self._bridge.port,
        }
        if self._bridge.token:
            data[CONF_TOKEN] = self._bridge.token
        return self.async_create_entry(
            title=self._title,
            data=data,
        )

    async def _async_set_device_unique_id(self, raise_on_progress=True):
        """Set device unique_id."""
        if not await self._async_get_and_check_device_info():
            raise data_entry_flow.AbortFlow(RESULT_NOT_SUPPORTED)
        await self._async_set_unique_id_from_udn(raise_on_progress)
        self._async_update_and_abort_for_matching_unique_id()

    async def _async_set_unique_id_from_udn(self, raise_on_progress=True):
        """Set the unique id from the udn."""
        assert self._host is not None
        await self.async_set_unique_id(self._udn, raise_on_progress=raise_on_progress)
        if (entry := self._async_update_existing_host_entry()) and _entry_is_complete(
            entry
        ):
            raise data_entry_flow.AbortFlow("already_configured")

    def _async_update_and_abort_for_matching_unique_id(self):
        """Abort and update host and mac if we have it."""
        updates = {CONF_HOST: self._host}
        if self._mac:
            updates[CONF_MAC] = self._mac
        self._abort_if_unique_id_configured(updates=updates)

    def _try_connect(self):
        """Try to connect and check auth."""
        for method in SUPPORTED_METHODS:
            self._bridge = SamsungTVBridge.get_bridge(method, self._host)
            result = self._bridge.try_connect()
            if result == RESULT_SUCCESS:
                return
            if result != RESULT_CANNOT_CONNECT:
                raise data_entry_flow.AbortFlow(result)
        LOGGER.debug("No working config found")
        raise data_entry_flow.AbortFlow(RESULT_CANNOT_CONNECT)

    async def _async_get_and_check_device_info(self):
        """Try to get the device info."""
        _port, _method, info = await async_get_device_info(
            self.hass, self._bridge, self._host
        )
        if not info:
            if not _method:
                LOGGER.debug(
                    "Samsung host %s is not supported by either %s or %s methods",
                    self._host,
                    METHOD_LEGACY,
                    METHOD_WEBSOCKET,
                )
                raise data_entry_flow.AbortFlow(RESULT_NOT_SUPPORTED)
            return False
        dev_info = info.get("device", {})
        device_type = dev_info.get("type")
        if device_type != "Samsung SmartTV":
            raise data_entry_flow.AbortFlow(RESULT_NOT_SUPPORTED)
        self._model = dev_info.get("modelName")
        name = dev_info.get("name")
        self._name = name.replace("[TV] ", "") if name else device_type
        self._title = f"{self._name} ({self._model})"
        self._udn = _strip_uuid(dev_info.get("udn", info["id"]))
        if mac := mac_from_device_info(info):
            self._mac = mac
        elif mac := getmac.get_mac_address(ip=self._host):
            self._mac = mac
        self._device_info = info
        return True

    async def async_step_import(self, user_input=None):
        """Handle configuration by yaml file."""
        # We need to import even if we cannot validate
        # since the TV may be off at startup
        await self._async_set_name_host_from_input(user_input)
        self._async_abort_entries_match({CONF_HOST: self._host})
        port = user_input.get(CONF_PORT)
        if port in WEBSOCKET_PORTS:
            user_input[CONF_METHOD] = METHOD_WEBSOCKET
        elif port == LEGACY_PORT:
            user_input[CONF_METHOD] = METHOD_LEGACY
        user_input[CONF_MANUFACTURER] = DEFAULT_MANUFACTURER
        return self.async_create_entry(
            title=self._title,
            data=user_input,
        )

    async def _async_set_name_host_from_input(self, user_input):
        try:
            self._host = await self.hass.async_add_executor_job(
                socket.gethostbyname, user_input[CONF_HOST]
            )
        except socket.gaierror as err:
            raise data_entry_flow.AbortFlow(RESULT_UNKNOWN_HOST) from err
        self._name = user_input.get(CONF_NAME, self._host)
        self._title = self._name

    async def async_step_user(self, user_input=None):
        """Handle a flow initialized by the user."""
        if user_input is not None:
            await self._async_set_name_host_from_input(user_input)
            await self.hass.async_add_executor_job(self._try_connect)
            self._async_abort_entries_match({CONF_HOST: self._host})
            if self._bridge.method != METHOD_LEGACY:
                # Legacy bridge does not provide device info
                await self._async_set_device_unique_id(raise_on_progress=False)
            return self._get_entry_from_bridge()

        return self.async_show_form(step_id="user", data_schema=DATA_SCHEMA)

    @callback
    def _async_update_existing_host_entry(self):
        """Check existing entries and update them.

        Returns the existing entry if it was updated.
        """
        for entry in self._async_current_entries(include_ignore=False):
            if entry.data[CONF_HOST] != self._host:
                continue
            entry_kw_args = {}
            if self.unique_id and entry.unique_id is None:
                entry_kw_args["unique_id"] = self.unique_id
            if self._mac and not entry.data.get(CONF_MAC):
                entry_kw_args["data"] = {**entry.data, CONF_MAC: self._mac}
            if entry_kw_args:
                self.hass.config_entries.async_update_entry(entry, **entry_kw_args)
                self.hass.async_create_task(
                    self.hass.config_entries.async_reload(entry.entry_id)
                )
                return entry
        return None

    async def _async_start_discovery_with_mac_address(self):
        """Start discovery."""
        assert self._host is not None
        if (entry := self._async_update_existing_host_entry()) and entry.unique_id:
            # If we have the unique id and the mac we abort
            # as we do not need anything else
            raise data_entry_flow.AbortFlow("already_configured")
        self._async_abort_if_host_already_in_progress()

    @callback
    def _async_abort_if_host_already_in_progress(self):
        self.context[CONF_HOST] = self._host
        for progress in self._async_in_progress():
            if progress.get("context", {}).get(CONF_HOST) == self._host:
                raise data_entry_flow.AbortFlow("already_in_progress")

    @callback
    def _abort_if_manufacturer_is_not_samsung(self):
        if not self._manufacturer or not self._manufacturer.lower().startswith(
            "samsung"
        ):
            raise data_entry_flow.AbortFlow(RESULT_NOT_SUPPORTED)

    async def async_step_ssdp(self, discovery_info: DiscoveryInfoType):
        """Handle a flow initialized by ssdp discovery."""
        LOGGER.debug("Samsung device found via SSDP: %s", discovery_info)
        model_name = discovery_info.get(ATTR_UPNP_MODEL_NAME)
        self._udn = _strip_uuid(discovery_info[ATTR_UPNP_UDN])
        self._host = urlparse(discovery_info[ATTR_SSDP_LOCATION]).hostname
        await self._async_set_unique_id_from_udn()
        self._manufacturer = discovery_info[ATTR_UPNP_MANUFACTURER]
        self._abort_if_manufacturer_is_not_samsung()
        if not await self._async_get_and_check_device_info():
            # If we cannot get device info for an SSDP discovery
            # its likely a legacy tv.
            self._name = self._title = self._model = model_name
        self._async_update_and_abort_for_matching_unique_id()
        self._async_abort_if_host_already_in_progress()
        self.context["title_placeholders"] = {"device": self._title}
        return await self.async_step_confirm()

    async def async_step_dhcp(self, discovery_info: DiscoveryInfoType):
        """Handle a flow initialized by dhcp discovery."""
        LOGGER.debug("Samsung device found via DHCP: %s", discovery_info)
        self._mac = discovery_info[MAC_ADDRESS]
        self._host = discovery_info[IP_ADDRESS]
        await self._async_start_discovery_with_mac_address()
        await self._async_set_device_unique_id()
        self.context["title_placeholders"] = {"device": self._title}
        return await self.async_step_confirm()

    async def async_step_zeroconf(self, discovery_info: DiscoveryInfoType):
        """Handle a flow initialized by zeroconf discovery."""
        LOGGER.debug("Samsung device found via ZEROCONF: %s", discovery_info)
        self._mac = format_mac(discovery_info[ATTR_PROPERTIES]["deviceid"])
        self._host = discovery_info[CONF_HOST]
        await self._async_start_discovery_with_mac_address()
        await self._async_set_device_unique_id()
        self.context["title_placeholders"] = {"device": self._title}
        return await self.async_step_confirm()

    async def async_step_confirm(self, user_input=None):
        """Handle user-confirmation of discovered node."""
        if user_input is not None:

            await self.hass.async_add_executor_job(self._try_connect)
            return self._get_entry_from_bridge()

        self._set_confirm_only()
        return self.async_show_form(
            step_id="confirm", description_placeholders={"device": self._title}
        )

    async def async_step_reauth(self, data):
        """Handle configuration by re-auth."""
        self._reauth_entry = self.hass.config_entries.async_get_entry(
            self.context["entry_id"]
        )
        data = self._reauth_entry.data
        if data.get(CONF_MODEL) and data.get(CONF_NAME):
            self._title = f"{data[CONF_NAME]} ({data[CONF_MODEL]})"
        else:
            self._title = data.get(CONF_NAME) or data[CONF_HOST]
        return await self.async_step_reauth_confirm()

    async def async_step_reauth_confirm(self, user_input=None):
        """Confirm reauth."""
        errors = {}
        if user_input is not None:
            bridge = SamsungTVBridge.get_bridge(
                self._reauth_entry.data[CONF_METHOD], self._reauth_entry.data[CONF_HOST]
            )
            result = await self.hass.async_add_executor_job(bridge.try_connect)
            if result == RESULT_SUCCESS:
                new_data = dict(self._reauth_entry.data)
                new_data[CONF_TOKEN] = bridge.token
                self.hass.config_entries.async_update_entry(
                    self._reauth_entry, data=new_data
                )
                await self.hass.config_entries.async_reload(self._reauth_entry.entry_id)
                return self.async_abort(reason="reauth_successful")
            if result not in (RESULT_AUTH_MISSING, RESULT_CANNOT_CONNECT):
                return self.async_abort(reason=result)

            # On websocket we will get RESULT_CANNOT_CONNECT when auth is missing
            errors = {"base": RESULT_AUTH_MISSING}

        self.context["title_placeholders"] = {"device": self._title}
        return self.async_show_form(
            step_id="reauth_confirm",
            errors=errors,
            description_placeholders={"device": self._title},
        )