"""Config flow for ONVIF."""
from __future__ import annotations

from collections.abc import Mapping
from pprint import pformat
from typing import Any
from urllib.parse import urlparse

import voluptuous as vol
from wsdiscovery.discovery import ThreadedWSDiscovery as WSDiscovery
from wsdiscovery.scope import Scope
from wsdiscovery.service import Service
from zeep.exceptions import Fault

from homeassistant import config_entries
from homeassistant.components import dhcp
from homeassistant.components.ffmpeg import CONF_EXTRA_ARGUMENTS
from homeassistant.components.stream import (
    CONF_RTSP_TRANSPORT,
    CONF_USE_WALLCLOCK_AS_TIMESTAMPS,
    RTSP_TRANSPORTS,
)
from homeassistant.const import (
    CONF_HOST,
    CONF_NAME,
    CONF_PASSWORD,
    CONF_PORT,
    CONF_USERNAME,
)
from homeassistant.core import HomeAssistant, callback
from homeassistant.data_entry_flow import AbortFlow, FlowResult
from homeassistant.helpers import device_registry as dr

from .const import (
    CONF_DEVICE_ID,
    DEFAULT_ARGUMENTS,
    DEFAULT_PORT,
    DOMAIN,
    GET_CAPABILITIES_EXCEPTIONS,
    LOGGER,
)
from .device import get_device
from .util import is_auth_error, stringify_onvif_error

CONF_MANUAL_INPUT = "Manually configure ONVIF device"


def wsdiscovery() -> list[Service]:
    """Get ONVIF Profile S devices from network."""
    discovery = WSDiscovery(ttl=4)
    discovery.start()
    services = discovery.searchServices(
        scopes=[Scope("onvif://www.onvif.org/Profile/Streaming")]
    )
    discovery.stop()
    return services


async def async_discovery(hass: HomeAssistant) -> list[dict[str, Any]]:
    """Return if there are devices that can be discovered."""
    LOGGER.debug("Starting ONVIF discovery")
    services = await hass.async_add_executor_job(wsdiscovery)

    devices = []
    for service in services:
        url = urlparse(service.getXAddrs()[0])
        device = {
            CONF_DEVICE_ID: None,
            CONF_NAME: service.getEPR(),
            CONF_HOST: url.hostname,
            CONF_PORT: url.port or 80,
        }
        for scope in service.getScopes():
            scope_str = scope.getValue()
            if scope_str.lower().startswith("onvif://www.onvif.org/name"):
                device[CONF_NAME] = scope_str.split("/")[-1]
            if scope_str.lower().startswith("onvif://www.onvif.org/mac"):
                device[CONF_DEVICE_ID] = scope_str.split("/")[-1]
        devices.append(device)

    return devices


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

    VERSION = 1
    _reauth_entry: config_entries.ConfigEntry

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

    def __init__(self):
        """Initialize the ONVIF config flow."""
        self.device_id = None
        self.devices = []
        self.onvif_config = {}

    async def async_step_user(self, user_input=None):
        """Handle user flow."""
        if user_input:
            if user_input["auto"]:
                return await self.async_step_device()
            return await self.async_step_configure()

        return self.async_show_form(
            step_id="user",
            data_schema=vol.Schema({vol.Required("auto", default=True): bool}),
        )

    async def async_step_reauth(self, entry_data: Mapping[str, Any]) -> FlowResult:
        """Handle re-authentication of an existing config entry."""
        reauth_entry = self.hass.config_entries.async_get_entry(
            self.context["entry_id"]
        )
        assert reauth_entry is not None
        self._reauth_entry = reauth_entry
        return await self.async_step_reauth_confirm()

    async def async_step_reauth_confirm(
        self, user_input: dict[str, Any] | None = None
    ) -> FlowResult:
        """Confirm reauth."""
        entry = self._reauth_entry
        errors: dict[str, str] | None = {}
        description_placeholders: dict[str, str] | None = None
        if user_input is not None:
            entry_data = entry.data
            self.onvif_config = entry_data | user_input
            errors, description_placeholders = await self.async_setup_profiles(
                configure_unique_id=False
            )
            if not errors:
                hass = self.hass
                entry_id = entry.entry_id
                hass.config_entries.async_update_entry(entry, data=self.onvif_config)
                hass.async_create_task(hass.config_entries.async_reload(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,
            description_placeholders=description_placeholders,
        )

    async def async_step_dhcp(self, discovery_info: dhcp.DhcpServiceInfo) -> FlowResult:
        """Handle dhcp discovery."""
        hass = self.hass
        mac = discovery_info.macaddress
        registry = dr.async_get(self.hass)
        if not (
            device := registry.async_get_device(
                identifiers=set(), connections={(dr.CONNECTION_NETWORK_MAC, mac)}
            )
        ):
            return self.async_abort(reason="no_devices_found")
        for entry_id in device.config_entries:
            if (
                not (entry := hass.config_entries.async_get_entry(entry_id))
                or entry.domain != DOMAIN
                or entry.state is config_entries.ConfigEntryState.LOADED
            ):
                continue
            if hass.config_entries.async_update_entry(
                entry, data=entry.data | {CONF_HOST: discovery_info.ip}
            ):
                hass.async_create_task(self.hass.config_entries.async_reload(entry_id))
        return self.async_abort(reason="already_configured")

    async def async_step_device(self, user_input=None):
        """Handle WS-Discovery.

        Let user choose between discovered devices and manual configuration.
        If no device is found allow user to manually input configuration.
        """
        if user_input:
            if user_input[CONF_HOST] == CONF_MANUAL_INPUT:
                return await self.async_step_configure()

            for device in self.devices:
                name = f"{device[CONF_NAME]} ({device[CONF_HOST]})"
                if name == user_input[CONF_HOST]:
                    self.device_id = device[CONF_DEVICE_ID]
                    self.onvif_config = {
                        CONF_NAME: device[CONF_NAME],
                        CONF_HOST: device[CONF_HOST],
                        CONF_PORT: device[CONF_PORT],
                    }
                    return await self.async_step_configure()

        discovery = await async_discovery(self.hass)
        for device in discovery:
            configured = any(
                entry.unique_id == device[CONF_DEVICE_ID]
                for entry in self._async_current_entries()
            )

            if not configured:
                self.devices.append(device)

        LOGGER.debug("Discovered ONVIF devices %s", pformat(self.devices))

        if self.devices:
            names = [
                f"{device[CONF_NAME]} ({device[CONF_HOST]})" for device in self.devices
            ]

            names.append(CONF_MANUAL_INPUT)

            return self.async_show_form(
                step_id="device",
                data_schema=vol.Schema({vol.Optional(CONF_HOST): vol.In(names)}),
            )

        return await self.async_step_configure()

    async def async_step_configure(
        self, user_input: dict[str, Any] | None = None
    ) -> FlowResult:
        """Device configuration."""
        errors: dict[str, str] = {}
        description_placeholders: dict[str, str] = {}
        if user_input:
            self.onvif_config = user_input
            errors, description_placeholders = await self.async_setup_profiles()
            if not errors:
                title = f"{self.onvif_config[CONF_NAME]} - {self.device_id}"
                return self.async_create_entry(title=title, data=self.onvif_config)

        def conf(name, default=None):
            return self.onvif_config.get(name, default)

        # Username and Password are optional and default empty
        # due to some cameras not allowing you to change ONVIF user settings.
        # See https://github.com/home-assistant/core/issues/39182
        # and https://github.com/home-assistant/core/issues/35904
        return self.async_show_form(
            step_id="configure",
            data_schema=vol.Schema(
                {
                    vol.Required(CONF_NAME, default=conf(CONF_NAME)): str,
                    vol.Required(CONF_HOST, default=conf(CONF_HOST)): str,
                    vol.Required(CONF_PORT, default=conf(CONF_PORT, DEFAULT_PORT)): int,
                    vol.Optional(CONF_USERNAME, default=conf(CONF_USERNAME, "")): str,
                    vol.Optional(CONF_PASSWORD, default=conf(CONF_PASSWORD, "")): str,
                }
            ),
            errors=errors,
            description_placeholders=description_placeholders,
        )

    async def async_setup_profiles(
        self, configure_unique_id: bool = True
    ) -> tuple[dict[str, str], dict[str, str]]:
        """Fetch ONVIF device profiles."""
        LOGGER.debug(
            "Fetching profiles from ONVIF device %s", pformat(self.onvif_config)
        )

        device = get_device(
            self.hass,
            self.onvif_config[CONF_HOST],
            self.onvif_config[CONF_PORT],
            self.onvif_config[CONF_USERNAME],
            self.onvif_config[CONF_PASSWORD],
        )

        try:
            await device.update_xaddrs()
            device_mgmt = await device.create_devicemgmt_service()
            # Get the MAC address to use as the unique ID for the config flow
            if not self.device_id:
                try:
                    network_interfaces = await device_mgmt.GetNetworkInterfaces()
                    interface = next(
                        filter(lambda interface: interface.Enabled, network_interfaces),
                        None,
                    )
                    if interface:
                        self.device_id = interface.Info.HwAddress
                except Fault as fault:
                    if "not implemented" not in fault.message:
                        raise fault
                    LOGGER.debug(
                        "%s: Could not get network interfaces: %s",
                        self.onvif_config[CONF_NAME],
                        stringify_onvif_error(fault),
                    )
            # If no network interfaces are exposed, fallback to serial number
            if not self.device_id:
                device_info = await device_mgmt.GetDeviceInformation()
                self.device_id = device_info.SerialNumber

            if not self.device_id:
                raise AbortFlow(reason="no_mac")

            if configure_unique_id:
                await self.async_set_unique_id(self.device_id, raise_on_progress=False)
                self._abort_if_unique_id_configured(
                    updates={
                        CONF_HOST: self.onvif_config[CONF_HOST],
                        CONF_PORT: self.onvif_config[CONF_PORT],
                        CONF_NAME: self.onvif_config[CONF_NAME],
                        CONF_USERNAME: self.onvif_config[CONF_USERNAME],
                        CONF_PASSWORD: self.onvif_config[CONF_PASSWORD],
                    }
                )
            # Verify there is an H264 profile
            media_service = await device.create_media_service()
            profiles = await media_service.GetProfiles()
        except AttributeError:  # Likely an empty document or 404 from the wrong port
            LOGGER.debug(
                "%s: No ONVIF service found at %s:%s",
                self.onvif_config[CONF_NAME],
                self.onvif_config[CONF_HOST],
                self.onvif_config[CONF_PORT],
                exc_info=True,
            )
            return {CONF_PORT: "no_onvif_service"}, {}
        except Fault as err:
            stringified_error = stringify_onvif_error(err)
            description_placeholders = {"error": stringified_error}
            if is_auth_error(err):
                LOGGER.debug(
                    "%s: Could not authenticate with camera: %s",
                    self.onvif_config[CONF_NAME],
                    stringified_error,
                )
                return {CONF_PASSWORD: "auth_failed"}, description_placeholders
            LOGGER.debug(
                "%s: Could not determine camera capabilities: %s",
                self.onvif_config[CONF_NAME],
                stringified_error,
                exc_info=True,
            )
            return {"base": "onvif_error"}, description_placeholders
        except GET_CAPABILITIES_EXCEPTIONS as err:
            LOGGER.debug(
                "%s: Could not determine camera capabilities: %s",
                self.onvif_config[CONF_NAME],
                stringify_onvif_error(err),
                exc_info=True,
            )
            return {"base": "onvif_error"}, {"error": stringify_onvif_error(err)}
        else:
            if not any(
                profile.VideoEncoderConfiguration
                and profile.VideoEncoderConfiguration.Encoding == "H264"
                for profile in profiles
            ):
                raise AbortFlow(reason="no_h264")
            return {}, {}
        finally:
            await device.close()


class OnvifOptionsFlowHandler(config_entries.OptionsFlow):
    """Handle ONVIF options."""

    def __init__(self, config_entry: config_entries.ConfigEntry) -> None:
        """Initialize ONVIF options flow."""
        self.config_entry = config_entry
        self.options = dict(config_entry.options)

    async def async_step_init(self, user_input=None):
        """Manage the ONVIF options."""
        return await self.async_step_onvif_devices()

    async def async_step_onvif_devices(self, user_input=None):
        """Manage the ONVIF devices options."""
        if user_input is not None:
            self.options[CONF_EXTRA_ARGUMENTS] = user_input[CONF_EXTRA_ARGUMENTS]
            self.options[CONF_RTSP_TRANSPORT] = user_input[CONF_RTSP_TRANSPORT]
            self.options[CONF_USE_WALLCLOCK_AS_TIMESTAMPS] = user_input.get(
                CONF_USE_WALLCLOCK_AS_TIMESTAMPS,
                self.config_entry.options.get(CONF_USE_WALLCLOCK_AS_TIMESTAMPS, False),
            )
            return self.async_create_entry(title="", data=self.options)

        advanced_options = {}
        if self.show_advanced_options:
            advanced_options[
                vol.Optional(
                    CONF_USE_WALLCLOCK_AS_TIMESTAMPS,
                    default=self.config_entry.options.get(
                        CONF_USE_WALLCLOCK_AS_TIMESTAMPS, False
                    ),
                )
            ] = bool
        return self.async_show_form(
            step_id="onvif_devices",
            data_schema=vol.Schema(
                {
                    vol.Optional(
                        CONF_EXTRA_ARGUMENTS,
                        default=self.config_entry.options.get(
                            CONF_EXTRA_ARGUMENTS, DEFAULT_ARGUMENTS
                        ),
                    ): str,
                    vol.Optional(
                        CONF_RTSP_TRANSPORT,
                        default=self.config_entry.options.get(
                            CONF_RTSP_TRANSPORT, next(iter(RTSP_TRANSPORTS))
                        ),
                    ): vol.In(RTSP_TRANSPORTS),
                    **advanced_options,
                }
            ),
        )
