# SPDX-FileCopyrightText: 2020 The Magma Authors.
# SPDX-FileCopyrightText: 2022 Open Networking Foundation <support@opennetworking.org>
#
# SPDX-License-Identifier: BSD-3-Clause

from typing import Any, Callable, Dict, List, Optional, Type

from common.service import MagmaService
from data_models import transform_for_enb, transform_for_magma
from data_models.data_model import DataModel, TrParam
from data_models.data_model_parameters import (
    ParameterName,
    TrParameterType,
)
from device_config.enodeb_config_postprocessor import (
    EnodebConfigurationPostProcessor,
)
from device_config.enodeb_configuration import EnodebConfiguration
from devices.device_utils import EnodebDeviceName
from exceptions import Tr069Error
from logger import EnodebdLogger as logger
from state_machines.acs_state_utils import (
    get_all_objects_to_add,
    get_all_objects_to_delete,
)
from state_machines.enb_acs import EnodebAcsStateMachine
from state_machines.enb_acs_impl import BasicEnodebAcsStateMachine
from state_machines.enb_acs_states import (
    AcsMsgAndTransition,
    AcsReadMsgResult,
    AddObjectsState,
    DeleteObjectsState,
    EndSessionState,
    EnodebAcsState,
    ErrorState,
    GetParametersState,
    GetRPCMethodsState,
    SendGetTransientParametersState,
    SendRebootState,
    SetParameterValuesNotAdminState,
    WaitEmptyMessageState,
    WaitGetObjectParametersState,
    WaitGetParametersState,
    WaitGetTransientParametersState,
    WaitInformMRebootState,
    WaitInformState,
    WaitRebootResponseState,
    WaitSetParameterValuesState,
)
from tr069 import models


class CaviumHandler(BasicEnodebAcsStateMachine):
    def __init__(
            self,
            service: MagmaService,
    ) -> None:
        self._state_map = {}
        super().__init__(service=service, use_param_key=False)

    def reboot_asap(self) -> None:
        self.transition('reboot')

    def is_enodeb_connected(self) -> bool:
        return not isinstance(self.state, WaitInformState)

    def _init_state_map(self) -> None:
        self._state_map = {
            'wait_inform': WaitInformState(self, when_done='get_rpc_methods'),
            'get_rpc_methods': GetRPCMethodsState(self, when_done='wait_empty', when_skip='get_transient_params'),
            'wait_empty': WaitEmptyMessageState(self, when_done='get_transient_params'),
            'get_transient_params': SendGetTransientParametersState(self, when_done='wait_get_transient_params'),
            'wait_get_transient_params': WaitGetTransientParametersState(self, when_get='get_params', when_get_obj_params='get_obj_params', when_delete='delete_objs', when_add='add_objs', when_set='set_params', when_skip='end_session'),
            'get_params': GetParametersState(self, when_done='wait_get_params'),
            'wait_get_params': WaitGetParametersState(self, when_done='get_obj_params'),
            'get_obj_params': CaviumGetObjectParametersState(self, when_done='wait_get_obj_params'),
            'wait_get_obj_params': CaviumWaitGetObjectParametersState(self, when_edit='disable_admin', when_skip='get_transient_params'),
            'disable_admin': CaviumDisableAdminEnableState(self, admin_value=False, when_done='wait_disable_admin'),
            'wait_disable_admin': CaviumWaitDisableAdminEnableState(self, admin_value=False, when_add='add_objs', when_delete='delete_objs', when_done='set_params'),
            'delete_objs': DeleteObjectsState(self, when_add='add_objs', when_skip='set_params'),
            'add_objs': AddObjectsState(self, when_done='set_params'),
            'set_params': SetParameterValuesNotAdminState(self, when_done='wait_set_params'),
            'wait_set_params': WaitSetParameterValuesState(self, when_done='enable_admin', when_apply_invasive='enable_admin'),
            'enable_admin': CaviumDisableAdminEnableState(self, admin_value=True, when_done='wait_enable_admin'),
            'wait_enable_admin': CaviumWaitDisableAdminEnableState(self, admin_value=True, when_done='check_get_params', when_add='check_get_params', when_delete='check_get_params'),
            'check_get_params': GetParametersState(self, when_done='check_wait_get_params', request_all_params=True),
            'check_wait_get_params': WaitGetParametersState(self, when_done='end_session'),
            'end_session': EndSessionState(self),
            # Below states only entered through manual user intervention
            'reboot': SendRebootState(self, when_done='wait_reboot'),
            'wait_reboot': WaitRebootResponseState(self, when_done='wait_post_reboot_inform'),
            'wait_post_reboot_inform': WaitInformMRebootState(self, when_done='wait_reboot_delay', when_timeout='wait_inform'),
            # The states below are entered when an unexpected message type is
            # received
            'unexpected_fault': ErrorState(self, inform_transition_target='wait_inform'),
        }

    @property
    def device_name(self) -> str:
        return EnodebDeviceName.CAVIUM

    @property
    def data_model_class(self) -> Type[DataModel]:
        return CaviumTrDataModel

    @property
    def config_postprocessor(self) -> EnodebConfigurationPostProcessor:
        return CaviumTrConfigurationInitializer()

    @property
    def state_map(self) -> Dict[str, EnodebAcsState]:
        return self._state_map

    @property
    def disconnected_state_name(self) -> str:
        return 'wait_inform'

    @property
    def unexpected_fault_state_name(self) -> str:
        return 'unexpected_fault'


class CaviumGetObjectParametersState(EnodebAcsState):
    """
    When booted, the PLMN list is empty so we cannot get individual
    object parameters. Instead, get the parent object PLMN_LIST
    which will include any children if they exist.
    """

    def __init__(self, acs: EnodebAcsStateMachine, when_done: str):
        super().__init__()
        self.acs = acs
        self.done_transition = when_done

    def get_msg(self, message: Any) -> AcsMsgAndTransition:
        """ Respond with GetParameterValuesRequest """
        names = [ParameterName.PLMN_LIST]

        # Generate the request
        request = models.GetParameterValues()
        request.ParameterNames = models.ParameterNames()
        request.ParameterNames.arrayType = 'xsd:string[%d]' \
                                           % len(names)
        request.ParameterNames.string = []
        for name in names:
            path = self.acs.data_model.get_parameter(name).path
            request.ParameterNames.string.append(path)

        return AcsMsgAndTransition(request, self.done_transition)

    def state_description(self) -> str:
        return 'Getting object parameters'


class CaviumWaitGetObjectParametersState(WaitGetObjectParametersState):
    def __init__(
        self,
        acs: EnodebAcsStateMachine,
        when_edit: str,
        when_skip: str,
    ):
        super().__init__(
            acs=acs,
            when_add=when_edit,
            when_delete=when_edit,
            when_set=when_edit,
            when_skip=when_skip,
        )


class CaviumDisableAdminEnableState(EnodebAcsState):
    """
    Cavium requires that we disable 'Admin Enable' before configuring
    most parameters
    """

    def __init__(self, acs: EnodebAcsStateMachine, admin_value: bool, when_done: str):
        super().__init__()
        self.acs = acs
        self.admin_value = admin_value
        self.done_transition = when_done

    def read_msg(self, message: Any) -> AcsReadMsgResult:
        if not isinstance(message, models.DummyInput):
            return AcsReadMsgResult(False, None)
        return AcsReadMsgResult(True, None)

    def get_msg(self, message: Any) -> AcsMsgAndTransition:
        """
        Returns:
            A SetParameterValueRequest for setting 'Admin Enable' to False
        """
        param_name = ParameterName.ADMIN_STATE
        # if we want the cell to be down don't force it up
        desired_admin_value = \
                self.acs.desired_cfg.get_parameter(param_name) \
                and self.admin_value
        admin_value = \
                self.acs.data_model.transform_for_enb(
                    param_name,
                    desired_admin_value,
                )
        admin_path = self.acs.data_model.get_parameter(param_name).path
        param_values = {admin_path: admin_value}

        request = models.SetParameterValues()
        request.ParameterList = models.ParameterValueList()
        request.ParameterList.arrayType = 'cwmp:ParameterValueStruct[%d]' \
                                          % len(param_values)

        name_value = models.ParameterValueStruct()
        name_value.Name = admin_path
        name_value.Value = models.anySimpleType()
        name_value.Value.type = 'xsd:string'
        name_value.Value.Data = str(admin_value)
        request.ParameterList.ParameterValueStruct = [name_value]

        return AcsMsgAndTransition(request, self.done_transition)

    def state_description(self) -> str:
        return 'Disabling admin_enable (Cavium only)'


class CaviumWaitDisableAdminEnableState(EnodebAcsState):
    def __init__(
            self,
            acs: EnodebAcsStateMachine,
            admin_value: bool,
            when_done: str,
            when_add: str,
            when_delete: str,
    ):
        super().__init__()
        self.acs = acs
        self.done_transition = when_done
        self.add_obj_transition = when_add
        self.del_obj_transition = when_delete
        self.admin_value = admin_value

    def read_msg(self, message: Any) -> Optional[str]:
        if type(message) == models.Fault:
            logger.error('Received Fault in response to SetParameterValues')
            if message.SetParameterValuesFault is not None:
                for fault in message.SetParameterValuesFault:
                    logger.error(
                        'SetParameterValuesFault Param: %s, Code: %s, String: %s',
                        fault.ParameterName, fault.FaultCode, fault.FaultString,
                    )
            raise Tr069Error(
                'Received Fault in response to SetParameterValues '
                '(faultstring = %s)' % message.FaultString,
            )
        elif not isinstance(message, models.SetParameterValuesResponse):
            return AcsReadMsgResult(False, None)
        if message.Status != 0:
            raise Tr069Error(
                'Received SetParameterValuesResponse with '
                'Status=%d' % message.Status,
            )
        param_name = ParameterName.ADMIN_STATE
        desired_admin_value = \
                self.acs.desired_cfg.get_parameter(param_name) \
                and self.admin_value
        magma_value = \
                self.acs.data_model.transform_for_magma(
                    param_name,
                    desired_admin_value,
                )
        self.acs.device_cfg.set_parameter(param_name, magma_value)

        if len(
            get_all_objects_to_delete(
                self.acs.desired_cfg,
                self.acs.device_cfg,
            ),
        ) > 0:
            return AcsReadMsgResult(True, self.del_obj_transition)
        elif len(
            get_all_objects_to_add(
                self.acs.desired_cfg,
                self.acs.device_cfg,
            ),
        ) > 0:
            return AcsReadMsgResult(True, self.add_obj_transition)
        else:
            return AcsReadMsgResult(True, self.done_transition)

    def state_description(self) -> str:
        return 'Disabling admin_enable (Cavium only)'


class CaviumTrDataModel(DataModel):
    """
    Class to represent relevant data model parameters from TR-196/TR-098/TR-181.
    This class is effectively read-only
    """
    # Mapping of TR parameter paths to aliases
    DEVICE_PATH = 'Device.'
    FAPSERVICE_PATH = DEVICE_PATH + 'Services.FAPService.1.'
    PARAMETERS = {
        # Top-level objects
        ParameterName.DEVICE: TrParam(DEVICE_PATH, True, TrParameterType.OBJECT, False),
        ParameterName.FAP_SERVICE: TrParam(FAPSERVICE_PATH, True, TrParameterType.OBJECT, False),

        # Device info parameters
        ParameterName.GPS_STATUS: TrParam(DEVICE_PATH + 'FAP.GPS.ContinuousGPSStatus.GotFix', True, TrParameterType.BOOLEAN, False),
        ParameterName.GPS_LAT: TrParam(DEVICE_PATH + 'FAP.GPS.LockedLatitude', True, TrParameterType.INT, False),
        ParameterName.GPS_LONG: TrParam(DEVICE_PATH + 'FAP.GPS.LockedLongitude', True, TrParameterType.INT, False),
        ParameterName.SW_VERSION: TrParam(DEVICE_PATH + 'DeviceInfo.SoftwareVersion', True, TrParameterType.STRING, False),
        ParameterName.SERIAL_NUMBER: TrParam(DEVICE_PATH + 'DeviceInfo.SerialNumber', True, TrParameterType.STRING, False),

        # Capabilities
        ParameterName.DUPLEX_MODE_CAPABILITY: TrParam(
            FAPSERVICE_PATH + 'Capabilities.LTE.DuplexMode', True, TrParameterType.STRING, False,
        ),
        ParameterName.BAND_CAPABILITY: TrParam(FAPSERVICE_PATH + 'Capabilities.LTE.BandsSupported', True, TrParameterType.UNSIGNED_INT, False),

        # RF-related parameters
        ParameterName.EARFCNDL: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.RAN.RF.EARFCNDL', True, TrParameterType.UNSIGNED_INT, False),
        ParameterName.EARFCNUL: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.RAN.RF.EARFCNUL', True, TrParameterType.UNSIGNED_INT, False),
        ParameterName.BAND: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.RAN.RF.FreqBandIndicator', True, TrParameterType.UNSIGNED_INT, False),
        ParameterName.PCI1: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.RAN.RF.PhyCellID', True, TrParameterType.STRING, False),
        ParameterName.DL_BANDWIDTH: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.RAN.RF.DLBandwidth', True, TrParameterType.STRING, False),
        ParameterName.UL_BANDWIDTH: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.RAN.RF.ULBandwidth', True, TrParameterType.STRING, False),
        ParameterName.CELL_ID: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.RAN.Common.CellIdentity', True, TrParameterType.UNSIGNED_INT, False),

        # Other LTE parameters
        ParameterName.ADMIN_STATE: TrParam(FAPSERVICE_PATH + 'FAPControl.LTE.AdminState', False, TrParameterType.BOOLEAN, False),
        ParameterName.OP_STATE: TrParam(FAPSERVICE_PATH + 'FAPControl.LTE.OpState', True, TrParameterType.BOOLEAN, False),
        ParameterName.RF_TX_STATUS: TrParam(FAPSERVICE_PATH + 'FAPControl.LTE.RFTxStatus', True, TrParameterType.BOOLEAN, False),

        # RAN parameters
        ParameterName.CELL_RESERVED: TrParam(
            FAPSERVICE_PATH
            + 'CellConfig.LTE.RAN.CellRestriction.CellReservedForOperatorUse', True, TrParameterType.BOOLEAN, False,
        ),
        ParameterName.CELL_BARRED: TrParam(
            FAPSERVICE_PATH
            + 'CellConfig.LTE.RAN.CellRestriction.CellBarred', True, TrParameterType.BOOLEAN, False,
        ),

        # Core network parameters
        ParameterName.MME_ADDRESS: TrParam(
            FAPSERVICE_PATH + 'FAPControl.LTE.Gateway.S1SigLinkServerList', True, TrParameterType.STRING, False,
        ),
        ParameterName.MME_PORT: TrParam(FAPSERVICE_PATH + 'FAPControl.LTE.Gateway.S1SigLinkPort', True, TrParameterType.UNSIGNED_INT, False),
        ParameterName.NUM_PLMNS: TrParam(
            FAPSERVICE_PATH + 'CellConfig.LTE.EPC.PLMNListNumberOfEntries', True, TrParameterType.UNSIGNED_INT, False,
        ),
        ParameterName.PLMN: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.EPC.PLMNList.', True, TrParameterType.OBJECT, False),
        # PLMN arrays are added below
        ParameterName.TAC1: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.EPC.TAC', True, TrParameterType.UNSIGNED_INT, False),
        ParameterName.IP_SEC_ENABLE: TrParam(
            DEVICE_PATH + 'IPsec.Enable', False, TrParameterType.BOOLEAN, False,
        ),
        ParameterName.PERIODIC_INFORM_INTERVAL:
            TrParam(DEVICE_PATH + 'ManagementServer.PeriodicInformInterval', False, TrParameterType.UNSIGNED_INT, False),

        # Management server parameters
        ParameterName.PERIODIC_INFORM_ENABLE: TrParam(
                DEVICE_PATH + 'ManagementServer.PeriodicInformEnable',
                False, TrParameterType.BOOLEAN, False,
        ),
        ParameterName.PERIODIC_INFORM_INTERVAL: TrParam(
                DEVICE_PATH + 'ManagementServer.PeriodicInformInterval',
                False, TrParameterType.UNSIGNED_INT, False,
        ),

        # Performance management parameters
        ParameterName.PERF_MGMT_ENABLE: TrParam(
            FAPSERVICE_PATH + 'PerfMgmt.Config.1.Enable', False, TrParameterType.BOOLEAN, False,
        ),
        ParameterName.PERF_MGMT_UPLOAD_INTERVAL: TrParam(
            FAPSERVICE_PATH + 'PerfMgmt.Config.1.PeriodicUploadInterval', False, TrParameterType.UNSIGNED_INT, False,
        ),
        ParameterName.PERF_MGMT_UPLOAD_URL: TrParam(
            FAPSERVICE_PATH + 'PerfMgmt.Config.1.URL', False, TrParameterType.STRING, False,
        ),
        ParameterName.PERF_MGMT_USER: TrParam(
            FAPSERVICE_PATH + 'PerfMgmt.Config.1.Username',
            False, TrParameterType.STRING, False,
        ),
        ParameterName.PERF_MGMT_PASSWORD: TrParam(
            FAPSERVICE_PATH + 'PerfMgmt.Config.1.Password',
            False, TrParameterType.STRING, False,
        ),

        # PLMN Info
        ParameterName.PLMN_LIST: TrParam(
            FAPSERVICE_PATH + 'CellConfig.LTE.EPC.PLMNList.', False, TrParameterType.OBJECT, False,
        ),
    }

    NUM_PLMNS_IN_CONFIG = 6
    for i in range(1, NUM_PLMNS_IN_CONFIG + 1):
        PARAMETERS[ParameterName.PLMN_N % i] = TrParam(
            FAPSERVICE_PATH + 'CellConfig.LTE.EPC.PLMNList.%d.' % i, True, TrParameterType.OBJECT, False,
        )
        PARAMETERS[ParameterName.PLMN_N_CELL_RESERVED % i] = TrParam(
            FAPSERVICE_PATH
            + 'CellConfig.LTE.EPC.PLMNList.%d.CellReservedForOperatorUse' % i, True, TrParameterType.BOOLEAN, False,
        )
        PARAMETERS[ParameterName.PLMN_N_ENABLE % i] = TrParam(
            FAPSERVICE_PATH + 'CellConfig.LTE.EPC.PLMNList.%d.Enable' % i, True, TrParameterType.BOOLEAN, False,
        )
        PARAMETERS[ParameterName.PLMN_N_PRIMARY % i] = TrParam(
            FAPSERVICE_PATH + 'CellConfig.LTE.EPC.PLMNList.%d.IsPrimary' % i, True, TrParameterType.BOOLEAN, False,
        )
        PARAMETERS[ParameterName.PLMN_N_PLMNID % i] = TrParam(
            FAPSERVICE_PATH + 'CellConfig.LTE.EPC.PLMNList.%d.PLMNID' % i, True, TrParameterType.STRING, False,
        )

    TRANSFORMS_FOR_ENB = {
        ParameterName.DL_BANDWIDTH: transform_for_enb.bandwidth,
        ParameterName.UL_BANDWIDTH: transform_for_enb.bandwidth,
    }
    TRANSFORMS_FOR_MAGMA = {
        ParameterName.DL_BANDWIDTH: transform_for_magma.bandwidth,
        ParameterName.UL_BANDWIDTH: transform_for_magma.bandwidth,
        # We don't set GPS, so we don't need transform for enb
        ParameterName.GPS_LAT: transform_for_magma.gps_tr181,
        ParameterName.GPS_LONG: transform_for_magma.gps_tr181,
    }

    @classmethod
    def get_parameter(cls, param_name: ParameterName) -> Optional[TrParam]:
        return cls.PARAMETERS.get(param_name)

    @classmethod
    def _get_magma_transforms(
        cls,
    ) -> Dict[ParameterName, Callable[[Any], Any]]:
        return cls.TRANSFORMS_FOR_MAGMA

    @classmethod
    def _get_enb_transforms(cls) -> Dict[ParameterName, Callable[[Any], Any]]:
        return cls.TRANSFORMS_FOR_ENB

    @classmethod
    def get_load_parameters(cls) -> List[ParameterName]:
        """
        Load all the parameters instead of a subset.
        """
        return [ParameterName.DEVICE]

    @classmethod
    def get_num_plmns(cls) -> int:
        return cls.NUM_PLMNS_IN_CONFIG

    @classmethod
    def get_parameter_names(cls) -> List[ParameterName]:
        excluded_params = [
            str(ParameterName.DEVICE),
            str(ParameterName.FAP_SERVICE),
        ]
        names = list(
            filter(
                lambda x: (not str(x).startswith('PLMN'))
                and (str(x) not in excluded_params),
                cls.PARAMETERS.keys(),
            ),
        )
        return names

    @classmethod
    def get_numbered_param_names(
        cls,
    ) -> Dict[ParameterName, List[ParameterName]]:
        names = {}
        for i in range(1, cls.NUM_PLMNS_IN_CONFIG + 1):
            params = []
            params.append(ParameterName.PLMN_N_CELL_RESERVED % i)
            params.append(ParameterName.PLMN_N_ENABLE % i)
            params.append(ParameterName.PLMN_N_PRIMARY % i)
            params.append(ParameterName.PLMN_N_PLMNID % i)
            names[ParameterName.PLMN_N % i] = params
        return names


class CaviumTrConfigurationInitializer(EnodebConfigurationPostProcessor):
    def postprocess(self, desired_cfg: EnodebConfiguration) -> None:
        desired_cfg.set_parameter(ParameterName.CELL_BARRED, True)
        desired_cfg.set_parameter(ParameterName.ADMIN_STATE, True)