"""Config flow for Squeezebox integration."""

from __future__ import annotations

import asyncio
from http import HTTPStatus
import logging
from typing import TYPE_CHECKING, Any

from pysqueezebox import Server, async_discover
import voluptuous as vol

from homeassistant.components.media_player import DOMAIN as MP_DOMAIN
from homeassistant.config_entries import (
    ConfigEntry,
    ConfigFlow,
    ConfigFlowResult,
    OptionsFlow,
)
from homeassistant.const import CONF_HOST, CONF_PASSWORD, CONF_PORT, CONF_USERNAME
from homeassistant.core import callback
from homeassistant.data_entry_flow import AbortFlow
from homeassistant.helpers import entity_registry as er
from homeassistant.helpers.aiohttp_client import async_get_clientsession
from homeassistant.helpers.device_registry import format_mac
from homeassistant.helpers.selector import (
    NumberSelector,
    NumberSelectorConfig,
    NumberSelectorMode,
)
from homeassistant.helpers.service_info.dhcp import DhcpServiceInfo

from .const import (
    CONF_BROWSE_LIMIT,
    CONF_HTTPS,
    CONF_SERVER_LIST,
    CONF_VOLUME_STEP,
    DEFAULT_BROWSE_LIMIT,
    DEFAULT_PORT,
    DEFAULT_VOLUME_STEP,
    DOMAIN,
)

_LOGGER = logging.getLogger(__name__)

TIMEOUT = 5


FULL_EDIT_SCHEMA = vol.Schema(
    {
        vol.Required(CONF_HOST): str,
        vol.Required(CONF_PORT, default=DEFAULT_PORT): int,
        vol.Optional(CONF_USERNAME): str,
        vol.Optional(CONF_PASSWORD): str,
        vol.Optional(CONF_HTTPS, default=False): bool,
    }
)

SHORT_EDIT_SCHEMA = vol.Schema(
    {
        vol.Optional(CONF_USERNAME): str,
        vol.Optional(CONF_PASSWORD): str,
        vol.Optional(CONF_HTTPS, default=False): bool,
    }
)


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

    VERSION = 1

    def __init__(self) -> None:
        """Initialize an instance of the squeezebox config flow."""
        self.discovery_task: asyncio.Task | None = None
        self.discovered_servers: list[dict[str, Any]] = []
        self.chosen_server: dict[str, Any] = {}

    @staticmethod
    @callback
    def async_get_options_flow(config_entry: ConfigEntry) -> OptionsFlowHandler:
        """Get the options flow for this handler."""
        return OptionsFlowHandler()

    async def _discover(self) -> None:
        """Discover an unconfigured LMS server."""
        # Reset discovery state to avoid stale or duplicate servers across runs
        self.discovered_servers = []
        self.chosen_server = {}
        _discovery_task: asyncio.Task | None = None

        def _discovery_callback(server: Server) -> None:
            _discovery_info: dict[str, Any] | None = {}
            if server.uuid:
                # ignore already configured uuids
                for entry in self._async_current_entries():
                    if entry.unique_id == server.uuid:
                        return
                _discovery_info = {
                    CONF_HOST: server.host,
                    CONF_PORT: int(server.port),
                    "uuid": server.uuid,
                    "name": server.name,
                }

                _LOGGER.debug(
                    "Discovered server: %s, creating discovery_info %s",
                    server,
                    _discovery_info,
                )
                if _discovery_info not in self.discovered_servers:
                    self.discovered_servers.append(_discovery_info)

        _discovery_task = self.hass.async_create_task(
            async_discover(_discovery_callback)
        )

        await asyncio.sleep(TIMEOUT)

        _LOGGER.debug("Discovered Servers %s", self.discovered_servers)
        _discovery_task.cancel()

    async def _validate_input(self, data: dict[str, Any]) -> str | None:
        """Validate the user input allows us to connect.

        Retrieve unique id and abort if already configured.
        """
        server = Server(
            async_get_clientsession(self.hass),
            data[CONF_HOST],
            data[CONF_PORT],
            data.get(CONF_USERNAME),
            data.get(CONF_PASSWORD),
            https=data.get(CONF_HTTPS, False),
        )

        try:
            status = await server.async_query("serverstatus")
            if not status:
                if server.http_status == HTTPStatus.UNAUTHORIZED:
                    return "invalid_auth"
                return "cannot_connect"
        except Exception:
            _LOGGER.exception("Unknown exception while validating connection")
            return "unknown"

        if "uuid" not in status:
            _LOGGER.exception("Discovered server did not provide a uuid")
            return "missing_uuid"

        await self.async_set_unique_id(status["uuid"])
        self._abort_if_unique_id_configured()

        return None

    async def async_step_choose_server(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Choose manual or discover flow."""
        _chosen_host: str

        if user_input:
            _chosen_host = user_input[CONF_SERVER_LIST]
            for _server in self.discovered_servers:
                if _chosen_host == _server[CONF_HOST]:
                    self.chosen_server[CONF_HOST] = _chosen_host
                    self.chosen_server[CONF_PORT] = _server[CONF_PORT]
                    self.chosen_server[CONF_HTTPS] = False
            return await self.async_step_edit_discovered()

        _options = {
            _server[CONF_HOST]: f"{_server['name']} ({_server[CONF_HOST]})"
            for _server in self.discovered_servers
        }
        return self.async_show_form(
            step_id="choose_server",
            data_schema=vol.Schema({vol.Required(CONF_SERVER_LIST): vol.In(_options)}),
        )

    async def async_step_user(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Handle a flow initialized by the user."""

        return self.async_show_menu(
            step_id="user", menu_options=["start_discovery", "edit"]
        )

    async def async_step_discovery_failed(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Handle a failed discovery."""

        return self.async_show_menu(step_id="discovery_failed", menu_options=["edit"])

    async def async_step_start_discovery(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Handle a flow initialized by the user."""

        if not self.discovery_task:
            self.discovery_task = self.hass.async_create_task(self._discover())

        if self.discovery_task.done():
            self.discovery_task.cancel()
            self.discovery_task = None
            # Sleep to allow task cancellation to complete

            await asyncio.sleep(0.1)

            return self.async_show_progress_done(
                next_step_id="choose_server"
                if self.discovered_servers
                else "discovery_failed"
            )

        return self.async_show_progress(
            step_id="start_discovery",
            progress_action="start_discovery",
            progress_task=self.discovery_task,
        )

    async def async_step_edit(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Edit a discovered or manually inputted server."""

        errors = {}
        if user_input:
            error = await self._validate_input(user_input)
            if not error:
                return self.async_create_entry(
                    title=user_input[CONF_HOST], data=user_input
                )
            errors["base"] = error

        return self.async_show_form(
            step_id="edit",
            data_schema=FULL_EDIT_SCHEMA,
            errors=errors,
        )

    async def async_step_edit_discovered(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Edit a discovered or manually inputted server."""

        if not (await self._validate_input(self.chosen_server)):
            # Attempt to connect with default data successful
            return self.async_create_entry(
                title=self.chosen_server[CONF_HOST], data=self.chosen_server
            )
        errors = {}
        if user_input:
            user_input[CONF_HOST] = self.chosen_server[CONF_HOST]
            user_input[CONF_PORT] = self.chosen_server[CONF_PORT]
            error = await self._validate_input(user_input)
            if not error:
                return self.async_create_entry(
                    title=user_input[CONF_HOST], data=user_input
                )
            errors["base"] = error

        return self.async_show_form(
            step_id="edit_discovered",
            description_placeholders={
                "host": self.chosen_server[CONF_HOST],
                "port": self.chosen_server[CONF_PORT],
            },
            data_schema=SHORT_EDIT_SCHEMA,
            errors=errors,
        )

    async def async_step_edit_integration_discovered(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Edit a discovered or manually inputted server."""

        errors = {}
        if user_input:
            user_input[CONF_HOST] = self.chosen_server[CONF_HOST]
            user_input[CONF_PORT] = self.chosen_server[CONF_PORT]
            error = await self._validate_input(user_input)
            if not error:
                return self.async_create_entry(
                    title=user_input[CONF_HOST], data=user_input
                )
            errors["base"] = error
        return self.async_show_form(
            step_id="edit_integration_discovered",
            description_placeholders={
                "desc": f"LMS Host: {self.chosen_server[CONF_HOST]}, Port: {self.chosen_server[CONF_PORT]}"
            },
            data_schema=SHORT_EDIT_SCHEMA,
            errors=errors,
        )

    async def async_step_integration_discovery(
        self, _discovery_info: dict[str, Any]
    ) -> ConfigFlowResult:
        """Handle discovery of a server."""
        _LOGGER.debug("Reached server discovery flow with info: %s", _discovery_info)
        if "uuid" in _discovery_info:
            await self.async_set_unique_id(_discovery_info.pop("uuid"))
            self._abort_if_unique_id_configured()
        else:
            # attempt to connect to server and determine uuid. will fail if
            # password required
            error = await self._validate_input(_discovery_info)
            if error:
                await self._async_handle_discovery_without_unique_id()

        self.context.update(
            {"title_placeholders": {"host": _discovery_info[CONF_HOST]}}
        )
        self.chosen_server = _discovery_info
        return await self.async_step_edit_integration_discovered()

    async def async_step_dhcp(
        self, _discovery_info: DhcpServiceInfo
    ) -> ConfigFlowResult:
        """Handle dhcp discovery of a Squeezebox player."""
        _LOGGER.debug(
            "Reached dhcp discovery of a player with info: %s", _discovery_info
        )
        await self.async_set_unique_id(format_mac(_discovery_info.macaddress))
        self._abort_if_unique_id_configured()

        _LOGGER.debug("Configuring dhcp player with unique id: %s", self.unique_id)

        registry = er.async_get(self.hass)

        if TYPE_CHECKING:
            assert self.unique_id
        # if we have detected this player, do nothing. if not, there must be a server out there for us to configure, so start the normal user flow (which tries to autodetect server)
        if registry.async_get_entity_id(MP_DOMAIN, DOMAIN, self.unique_id) is not None:
            # this player is already known, so do nothing other than mark as configured
            raise AbortFlow("already_configured")

        # if the player is unknown, then we likely need to configure its server
        return await self.async_step_user()


OPTIONS_SCHEMA = vol.Schema(
    {
        vol.Required(CONF_BROWSE_LIMIT): vol.All(
            NumberSelector(
                NumberSelectorConfig(min=1, max=65534, mode=NumberSelectorMode.BOX)
            ),
            vol.Coerce(int),
        ),
        vol.Required(CONF_VOLUME_STEP): vol.All(
            NumberSelector(
                NumberSelectorConfig(min=1, max=20, mode=NumberSelectorMode.SLIDER)
            ),
            vol.Coerce(int),
        ),
    }
)


class OptionsFlowHandler(OptionsFlow):
    """Options Flow Handler."""

    async def async_step_init(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Options Flow Steps."""

        if user_input is not None:
            return self.async_create_entry(title="", data=user_input)

        return self.async_show_form(
            step_id="init",
            data_schema=self.add_suggested_values_to_schema(
                OPTIONS_SCHEMA,
                {
                    CONF_BROWSE_LIMIT: self.config_entry.options.get(
                        CONF_BROWSE_LIMIT, DEFAULT_BROWSE_LIMIT
                    ),
                    CONF_VOLUME_STEP: self.config_entry.options.get(
                        CONF_VOLUME_STEP, DEFAULT_VOLUME_STEP
                    ),
                },
            ),
        )
