"""Config flow for the MELCloud platform."""
from __future__ import annotations

import asyncio
from collections.abc import Mapping
from http import HTTPStatus
import logging
from typing import Any

from aiohttp import ClientError, ClientResponseError
import pymelcloud
import voluptuous as vol

from homeassistant import config_entries
from homeassistant.const import CONF_PASSWORD, CONF_TOKEN, CONF_USERNAME
from homeassistant.core import DOMAIN as HOMEASSISTANT_DOMAIN, HomeAssistant
from homeassistant.data_entry_flow import AbortFlow, FlowResult, FlowResultType
from homeassistant.helpers.aiohttp_client import async_get_clientsession
from homeassistant.helpers.issue_registry import IssueSeverity, async_create_issue

from .const import DOMAIN

_LOGGER = logging.getLogger(__name__)


async def async_create_import_issue(
    hass: HomeAssistant, source: str, issue: str, success: bool = False
) -> None:
    """Create issue from import."""
    if source != config_entries.SOURCE_IMPORT:
        return
    if not success:
        async_create_issue(
            hass,
            DOMAIN,
            f"deprecated_yaml_import_issue_{issue}",
            breaks_in_ha_version="2024.2.0",
            is_fixable=False,
            severity=IssueSeverity.ERROR,
            translation_key=f"deprecated_yaml_import_issue_{issue}",
        )
        return
    async_create_issue(
        hass,
        HOMEASSISTANT_DOMAIN,
        f"deprecated_yaml_{DOMAIN}",
        breaks_in_ha_version="2024.2.0",
        is_fixable=False,
        issue_domain=DOMAIN,
        severity=IssueSeverity.WARNING,
        translation_key="deprecated_yaml",
        translation_placeholders={
            "domain": DOMAIN,
            "integration_title": "MELCloud",
        },
    )


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

    VERSION = 1

    entry: config_entries.ConfigEntry | None = None

    async def _create_entry(self, username: str, token: str):
        """Register new entry."""
        await self.async_set_unique_id(username)
        try:
            self._abort_if_unique_id_configured({CONF_TOKEN: token})
        except AbortFlow:
            await async_create_import_issue(self.hass, self.context["source"], "", True)
            raise
        return self.async_create_entry(
            title=username, data={CONF_USERNAME: username, CONF_TOKEN: token}
        )

    async def _create_client(
        self,
        username: str,
        *,
        password: str | None = None,
        token: str | None = None,
    ):
        """Create client."""
        try:
            async with asyncio.timeout(10):
                if (acquired_token := token) is None:
                    acquired_token = await pymelcloud.login(
                        username,
                        password,
                        async_get_clientsession(self.hass),
                    )
                await pymelcloud.get_devices(
                    acquired_token,
                    async_get_clientsession(self.hass),
                )
        except ClientResponseError as err:
            if err.status in (HTTPStatus.UNAUTHORIZED, HTTPStatus.FORBIDDEN):
                await async_create_import_issue(
                    self.hass, self.context["source"], "invalid_auth"
                )
                return self.async_abort(reason="invalid_auth")
            await async_create_import_issue(
                self.hass, self.context["source"], "cannot_connect"
            )
            return self.async_abort(reason="cannot_connect")
        except (asyncio.TimeoutError, ClientError):
            await async_create_import_issue(
                self.hass, self.context["source"], "cannot_connect"
            )
            return self.async_abort(reason="cannot_connect")

        return await self._create_entry(username, acquired_token)

    async def async_step_user(self, user_input=None):
        """User initiated config flow."""
        if user_input is None:
            return self.async_show_form(
                step_id="user",
                data_schema=vol.Schema(
                    {vol.Required(CONF_USERNAME): str, vol.Required(CONF_PASSWORD): str}
                ),
            )
        username = user_input[CONF_USERNAME]
        return await self._create_client(username, password=user_input[CONF_PASSWORD])

    async def async_step_import(self, user_input):
        """Import a config entry."""
        result = await self._create_client(
            user_input[CONF_USERNAME], token=user_input[CONF_TOKEN]
        )
        if result["type"] == FlowResultType.CREATE_ENTRY:
            await async_create_import_issue(self.hass, self.context["source"], "", True)
        return result

    async def async_step_reauth(self, entry_data: Mapping[str, Any]) -> FlowResult:
        """Handle initiation of re-authentication with MELCloud."""
        self.entry = self.hass.config_entries.async_get_entry(self.context["entry_id"])
        return await self.async_step_reauth_confirm()

    async def async_step_reauth_confirm(
        self, user_input: dict[str, Any] | None = None
    ) -> FlowResult:
        """Handle re-authentication with MELCloud."""
        errors: dict[str, str] = {}

        if user_input is not None and self.entry:
            aquired_token, errors = await self.async_reauthenticate_client(user_input)

            if not errors:
                self.hass.config_entries.async_update_entry(
                    self.entry,
                    data={CONF_TOKEN: aquired_token},
                )
                self.hass.async_create_task(
                    self.hass.config_entries.async_reload(self.entry.entry_id)
                )
                return self.async_abort(reason="reauth_successful")

        return self.async_show_form(
            step_id="reauth_confirm",
            data_schema=vol.Schema(
                {vol.Required(CONF_USERNAME): str, vol.Required(CONF_PASSWORD): str}
            ),
            errors=errors,
        )

    async def async_reauthenticate_client(
        self, user_input: dict[str, Any]
    ) -> tuple[str | None, dict[str, str]]:
        """Reauthenticate with MELCloud."""
        errors: dict[str, str] = {}
        acquired_token = None

        try:
            async with asyncio.timeout(10):
                acquired_token = await pymelcloud.login(
                    user_input[CONF_USERNAME],
                    user_input[CONF_PASSWORD],
                    async_get_clientsession(self.hass),
                )
        except (ClientResponseError, AttributeError) as err:
            if isinstance(err, ClientResponseError) and err.status in (
                HTTPStatus.UNAUTHORIZED,
                HTTPStatus.FORBIDDEN,
            ):
                errors["base"] = "invalid_auth"
            elif isinstance(err, AttributeError) and err.name == "get":
                errors["base"] = "invalid_auth"
            else:
                errors["base"] = "cannot_connect"
        except (
            asyncio.TimeoutError,
            ClientError,
        ):
            errors["base"] = "cannot_connect"

        return acquired_token, errors