"""Config flow for Samsung SyncThru."""

import re
from urllib.parse import urlparse

from pysyncthru import ConnectionMode, SyncThru, SyncThruAPINotSupported
from url_normalize import url_normalize
import voluptuous as vol

from homeassistant import config_entries
from homeassistant.components import ssdp
from homeassistant.const import CONF_NAME, CONF_URL
from homeassistant.data_entry_flow import FlowResult
from homeassistant.helpers import aiohttp_client

from .const import DEFAULT_MODEL, DEFAULT_NAME_TEMPLATE, DOMAIN


class SyncThruConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
    """Samsung SyncThru config flow."""

    VERSION = 1

    url: str
    name: str

    async def async_step_user(self, user_input=None):
        """Handle user initiated flow."""
        if user_input is None:
            return await self._async_show_form(step_id="user")
        return await self._async_check_and_create("user", user_input)

    async def async_step_ssdp(self, discovery_info: ssdp.SsdpServiceInfo) -> FlowResult:
        """Handle SSDP initiated flow."""
        await self.async_set_unique_id(discovery_info.upnp[ssdp.ATTR_UPNP_UDN])
        self._abort_if_unique_id_configured()

        self.url = url_normalize(
            discovery_info.upnp.get(
                ssdp.ATTR_UPNP_PRESENTATION_URL,
                f"http://{urlparse(discovery_info.ssdp_location or '').hostname}/",
            )
        )

        for existing_entry in (
            x for x in self._async_current_entries() if x.data[CONF_URL] == self.url
        ):
            # Update unique id of entry with the same URL
            if not existing_entry.unique_id:
                self.hass.config_entries.async_update_entry(
                    existing_entry, unique_id=discovery_info.upnp[ssdp.ATTR_UPNP_UDN]
                )
            return self.async_abort(reason="already_configured")

        self.name = discovery_info.upnp.get(ssdp.ATTR_UPNP_FRIENDLY_NAME, "")
        if self.name:
            # Remove trailing " (ip)" if present for consistency with user driven config
            self.name = re.sub(r"\s+\([\d.]+\)\s*$", "", self.name)

        self.context["title_placeholders"] = {CONF_NAME: self.name}
        return await self.async_step_confirm()

    async def async_step_confirm(self, user_input=None):
        """Handle discovery confirmation by user."""
        if user_input is not None:
            return await self._async_check_and_create("confirm", user_input)

        return await self._async_show_form(
            step_id="confirm",
            user_input={CONF_URL: self.url, CONF_NAME: self.name},
        )

    async def _async_show_form(self, step_id, user_input=None, errors=None):
        """Show our form."""
        if user_input is None:
            user_input = {}
        return self.async_show_form(
            step_id=step_id,
            data_schema=vol.Schema(
                {
                    vol.Required(CONF_URL, default=user_input.get(CONF_URL, "")): str,
                    vol.Optional(CONF_NAME, default=user_input.get(CONF_NAME, "")): str,
                }
            ),
            errors=errors or {},
        )

    async def _async_check_and_create(self, step_id, user_input):
        """Validate input, proceed to create."""
        user_input[CONF_URL] = url_normalize(
            user_input[CONF_URL], default_scheme="http"
        )
        if "://" not in user_input[CONF_URL]:
            return await self._async_show_form(
                step_id=step_id, user_input=user_input, errors={CONF_URL: "invalid_url"}
            )

        # If we don't have a unique id, copy one from existing entry with same URL
        if not self.unique_id:
            for existing_entry in (
                x
                for x in self._async_current_entries()
                if x.data[CONF_URL] == user_input[CONF_URL] and x.unique_id
            ):
                await self.async_set_unique_id(existing_entry.unique_id)
                break

        session = aiohttp_client.async_get_clientsession(self.hass)
        printer = SyncThru(
            user_input[CONF_URL], session, connection_mode=ConnectionMode.API
        )
        errors = {}
        try:
            await printer.update()
            if not user_input.get(CONF_NAME):
                user_input[CONF_NAME] = DEFAULT_NAME_TEMPLATE.format(
                    printer.model() or DEFAULT_MODEL
                )
        except SyncThruAPINotSupported:
            errors[CONF_URL] = "syncthru_not_supported"
        else:
            if printer.is_unknown_state():
                errors[CONF_URL] = "unknown_state"

        if errors:
            return await self._async_show_form(
                step_id=step_id, user_input=user_input, errors=errors
            )

        return self.async_create_entry(
            title=user_input.get(CONF_NAME),
            data=user_input,
        )
