"""Config flow for ONVIF."""

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

from onvif.util import is_auth_error, stringify_onvif_error
import voluptuous as vol
from wsdiscovery.discovery import ThreadedWSDiscovery as WSDiscovery
from wsdiscovery.qname import QName
from wsdiscovery.scope import Scope
from wsdiscovery.service import Service
from zeep.exceptions import Fault

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.config_entries import (
    ConfigEntry,
    ConfigEntryState,
    ConfigFlow,
    ConfigFlowResult,
    OptionsFlow,
)
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, SectionConfig, section
from homeassistant.helpers import device_registry as dr
from homeassistant.helpers.service_info.dhcp import DhcpServiceInfo

from .const import (
    CONF_DEVICE_ID,
    CONF_ENABLE_WEBHOOKS,
    CONF_HARDWARE,
    CONF_MORE_OPTIONS,
    DEFAULT_ARGUMENTS,
    DEFAULT_ENABLE_WEBHOOKS,
    DEFAULT_PORT,
    DOMAIN,
    GET_CAPABILITIES_EXCEPTIONS,
    LOGGER,
)
from .device import get_device

CONF_MANUAL_INPUT = "Manually configure ONVIF device"


def wsdiscovery() -> list[Service]:
    """Get ONVIF Profile S devices from network."""
    discovery = WSDiscovery(ttl=4, relates_to=True)
    try:
        discovery.start()
        return discovery.searchServices(
            types=[
                QName(
                    "http://www.onvif.org/ver10/network/wsdl",
                    "NetworkVideoTransmitter",
                    "dp0",
                )
            ],
            scopes=[Scope("onvif://www.onvif.org/Profile/Streaming")],
            timeout=10,
        )
    finally:
        discovery.stop()


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,
            CONF_HARDWARE: None,
        }
        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/hardware"):
                device[CONF_HARDWARE] = 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(ConfigFlow, domain=DOMAIN):
    """Handle a ONVIF config flow."""

    VERSION = 1

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

    def __init__(self) -> None:
        """Initialize the ONVIF config flow."""
        self.device_id = None
        self.devices: list[dict[str, Any]] = []
        self.onvif_config: dict[str, Any] = {}

    @override
    async def async_step_user(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """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]
    ) -> ConfigFlowResult:
        """Handle re-authentication of an existing config entry."""
        return await self.async_step_reauth_confirm()

    async def async_step_reauth_confirm(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Confirm reauth."""
        errors: dict[str, str] | None = {}
        reauth_entry = self._get_reauth_entry()
        description_placeholders: dict[str, str] | None = None
        if user_input is not None:
            self.onvif_config = reauth_entry.data | user_input
            errors, description_placeholders = await self.async_setup_profiles(
                configure_unique_id=False
            )
            if not errors:
                return self.async_update_reload_and_abort(
                    reauth_entry, data=self.onvif_config
                )

        username = (user_input or {}).get(CONF_USERNAME) or reauth_entry.data[
            CONF_USERNAME
        ]
        return self.async_show_form(
            step_id="reauth_confirm",
            data_schema=vol.Schema(
                {
                    vol.Required(CONF_USERNAME, default=username): str,
                    vol.Required(CONF_PASSWORD): str,
                }
            ),
            errors=errors,
            description_placeholders=description_placeholders,
        )

    @override
    async def async_step_dhcp(
        self, discovery_info: DhcpServiceInfo
    ) -> ConfigFlowResult:
        """Handle dhcp discovery."""
        hass = self.hass
        mac = discovery_info.macaddress
        registry = dr.async_get(self.hass)
        if not (
            devices := registry.async_get_devices(
                connections={(dr.CONNECTION_NETWORK_MAC, mac)}
            )
        ):
            return self.async_abort(reason="no_devices_found")
        for device in devices:
            if (
                not (
                    entry := hass.config_entries.async_get_entry(device.config_entry_id)
                )
                or entry.domain != DOMAIN
                or entry.state is 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.entry_id)
                )
        return self.async_abort(reason="already_configured")

    async def async_step_device(
        self, user_input: dict[str, str] | None = None
    ) -> ConfigFlowResult:
        """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:
                if device[CONF_HOST] == 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)

        if LOGGER.isEnabledFor(logging.DEBUG):
            LOGGER.debug("Discovered ONVIF devices %s", pformat(self.devices))

        if self.devices:
            devices = {CONF_MANUAL_INPUT: CONF_MANUAL_INPUT}
            for device in self.devices:
                description = f"{device[CONF_NAME]} ({device[CONF_HOST]})"
                if hardware := device[CONF_HARDWARE]:
                    description += f" [{hardware}]"
                devices[device[CONF_HOST]] = description

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

        return await self.async_step_configure()

    async def async_step_configure(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """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(
                {
                    # Name field is no longer allowed in config flow schemas
                    # pylint: disable-next=home-assistant-config-flow-name-field
                    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."""
        if LOGGER.isEnabledFor(logging.DEBUG):
            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
                    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(OptionsFlow):
    """Handle ONVIF options."""

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

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

    async def async_step_onvif_devices(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Manage the ONVIF devices options."""
        if user_input is not None:
            more_options = user_input.pop(CONF_MORE_OPTIONS, {})
            self.options[CONF_EXTRA_ARGUMENTS] = user_input[CONF_EXTRA_ARGUMENTS]
            self.options[CONF_RTSP_TRANSPORT] = user_input[CONF_RTSP_TRANSPORT]
            self.options[CONF_ENABLE_WEBHOOKS] = user_input[CONF_ENABLE_WEBHOOKS]
            self.options[CONF_USE_WALLCLOCK_AS_TIMESTAMPS] = more_options.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)

        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),
                    vol.Optional(
                        CONF_ENABLE_WEBHOOKS,
                        default=self.config_entry.options.get(
                            CONF_ENABLE_WEBHOOKS, DEFAULT_ENABLE_WEBHOOKS
                        ),
                    ): bool,
                    vol.Required(CONF_MORE_OPTIONS): section(
                        vol.Schema(
                            {
                                vol.Optional(
                                    CONF_USE_WALLCLOCK_AS_TIMESTAMPS,
                                    default=self.config_entry.options.get(
                                        CONF_USE_WALLCLOCK_AS_TIMESTAMPS, False
                                    ),
                                ): bool,
                            }
                        ),
                        SectionConfig(collapsed=True),
                    ),
                }
            ),
        )
