"""
Copyright 2020 The Magma Authors.

This source code is licensed under the BSD-style license found in the
LICENSE file in the root directory of this source tree.

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""

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 state_machines.enb_acs_impl import BasicEnodebAcsStateMachine
from state_machines.enb_acs_states import (
    AddObjectsState,
    BaicellsRemWaitState,
    CheckOptionalParamsState,
    DeleteObjectsState,
    EnbSendRebootState,
    EndSessionState,
    EnodebAcsState,
    ErrorState,
    GetObjectParametersState,
    GetParametersState,
    SendGetTransientParametersState,
    SetParameterValuesState,
    WaitEmptyMessageState,
    WaitGetObjectParametersState,
    WaitGetParametersState,
    WaitGetTransientParametersState,
    WaitInformMRebootState,
    WaitInformState,
    WaitRebootResponseState,
    WaitSetParameterValuesState,
)


class BaicellsOldHandler(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='wait_empty', when_boot='wait_rem'),
            'wait_rem': BaicellsRemWaitState(self, when_done='wait_inform'),
            'wait_empty': WaitEmptyMessageState(self, when_done='get_transient_params', when_missing='check_optional_params'),
            'check_optional_params': CheckOptionalParamsState(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': GetObjectParametersState(self, when_done='wait_get_obj_params'),
            'wait_get_obj_params': WaitGetObjectParametersState(self, when_delete='delete_objs', when_add='add_objs', when_set='set_params', when_skip='end_session'),
            'delete_objs': DeleteObjectsState(self, when_add='add_objs', when_skip='set_params'),
            'add_objs': AddObjectsState(self, when_done='set_params'),
            'set_params': SetParameterValuesState(self, when_done='wait_set_params'),
            'wait_set_params': WaitSetParameterValuesState(self, when_done='check_get_params', when_apply_invasive='reboot'),
            '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),
            'reboot': EnbSendRebootState(self, when_done='wait_reboot'),
            'wait_reboot': WaitRebootResponseState(self, when_done='wait_post_reboot_inform'),
            'wait_post_reboot_inform': WaitInformMRebootState(self, when_done='wait_rem_post_reboot', when_timeout='wait_inform_post_reboot'),
            # After rebooting, we don't need to query optional params again.
            'wait_inform_post_reboot': WaitInformState(self, when_done='wait_empty_post_reboot', when_boot='wait_rem_post_reboot'),
            'wait_rem_post_reboot': BaicellsRemWaitState(self, when_done='wait_inform_post_reboot'),
            'wait_empty_post_reboot': WaitEmptyMessageState(self, when_done='get_transient_params', when_missing='check_optional_params'),
            # 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.BAICELLS_OLD

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

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

    @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 BaicellsTrOldDataModel(DataModel):
    """
    Class to represent relevant data model parameters from
    TR-196/TR-098/TR-181.

    This class is effectively read-only

    This is for any version before BaiStation_V100R001C00B110SPC003

    Some eNodeBs have a bug where the meaning of the following parameter is
    inverted:
    Device.Services.FAPService.1.CellConfig.LTE.EPC.PLMNList.1.CellReservedForOperatorUse
    I.e. CellReservedForOperatorUse = True in TR-196 results in the relevant
    SIB parameter being advertised as 'CellReservedForOperatorUse notReserved',
    and vice versa.

    This issue was fixed in the above SW version, so the flag should be
    inverted for the all versions PRECEEDING

    The same problem exists for 'cell barred'. See above description
    """
    # Parameters to query when reading eNodeB config
    LOAD_PARAMETERS = [ParameterName.DEVICE]
    # 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 + 'DeviceInfo.X_BAICELLS_COM_GPS_Status', True, TrParameterType.BOOLEAN, False),
        ParameterName.PTP_STATUS: TrParam(DEVICE_PATH + 'DeviceInfo.X_BAICELLS_COM_1588_Status', True, TrParameterType.BOOLEAN, False),
        ParameterName.MME_STATUS: TrParam(DEVICE_PATH + 'DeviceInfo.X_BAICELLS_COM_MME_Status', True, TrParameterType.BOOLEAN, False),
        ParameterName.REM_STATUS: TrParam(FAPSERVICE_PATH + 'REM.X_BAICELLS_COM_REM_Status', True, TrParameterType.BOOLEAN, True),
        ParameterName.LOCAL_GATEWAY_ENABLE:
            TrParam(DEVICE_PATH + 'DeviceInfo.X_BAICELLS_COM_LTE_LGW_Switch', False, TrParameterType.BOOLEAN, False),
        ParameterName.GPS_ENABLE: TrParam(DEVICE_PATH + 'X_BAICELLS_COM_GpsSyncEnable', False, TrParameterType.BOOLEAN, True),
        ParameterName.GPS_LAT: TrParam(DEVICE_PATH + 'FAP.GPS.LockedLatitude', True, TrParameterType.INT, True),
        ParameterName.GPS_LONG: TrParam(DEVICE_PATH + 'FAP.GPS.LockedLongitude', True, TrParameterType.INT, True),
        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.STRING, False),

        # RF-related parameters
        ParameterName.EARFCNDL: TrParam(FAPSERVICE_PATH + 'X_BAICELLS_COM_LTE.EARFCNDLInUse', True, TrParameterType.INT, False),
        ParameterName.EARFCNUL: TrParam(FAPSERVICE_PATH + 'X_BAICELLS_COM_LTE.EARFCNULInUse', True, TrParameterType.INT, False),
        ParameterName.BAND: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.RAN.RF.FreqBandIndicator', True, TrParameterType.INT, False),
        ParameterName.PCI: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.RAN.RF.PhyCellID', True, TrParameterType.INT, 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.SUBFRAME_ASSIGNMENT: TrParam(
            FAPSERVICE_PATH
            + 'CellConfig.LTE.RAN.PHY.TDDFrame.SubFrameAssignment', True, TrParameterType.INT, False,
        ),
        ParameterName.SPECIAL_SUBFRAME_PATTERN: TrParam(
            FAPSERVICE_PATH
            + 'CellConfig.LTE.RAN.PHY.TDDFrame.SpecialSubframePatterns', True, TrParameterType.INT, 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_IP: TrParam(
            FAPSERVICE_PATH + 'FAPControl.LTE.Gateway.S1SigLinkServerList', True, TrParameterType.STRING, False,
        ),
        ParameterName.MME_PORT: TrParam(FAPSERVICE_PATH + 'FAPControl.LTE.Gateway.S1SigLinkPort', True, TrParameterType.INT, False),
        ParameterName.NUM_PLMNS: TrParam(
            FAPSERVICE_PATH + 'CellConfig.LTE.EPC.PLMNListNumberOfEntries', True, TrParameterType.INT, False,
        ),
        ParameterName.PLMN: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.EPC.PLMNList.', True, TrParameterType.STRING, False),
        # PLMN arrays are added below
        ParameterName.TAC: TrParam(FAPSERVICE_PATH + 'CellConfig.LTE.EPC.TAC', True, TrParameterType.INT, False),
        ParameterName.IP_SEC_ENABLE: TrParam(
            DEVICE_PATH + 'Services.FAPService.Ipsec.IPSEC_ENABLE', False, TrParameterType.BOOLEAN, False,
        ),
        ParameterName.MME_POOL_ENABLE: TrParam(
            FAPSERVICE_PATH +
            'FAPControl.LTE.Gateway.X_BAICELLS_COM_MmePool.Enable', True, TrParameterType.BOOLEAN, True,
        ),

        # 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.INT, False),

        # Performance management parameters
        ParameterName.PERF_MGMT_ENABLE: TrParam(
            DEVICE_PATH + 'FAP.PerfMgmt.Config.1.Enable', False, TrParameterType.BOOLEAN, False,
        ),
        ParameterName.PERF_MGMT_UPLOAD_INTERVAL: TrParam(
            DEVICE_PATH + 'FAP.PerfMgmt.Config.1.PeriodicUploadInterval', False, TrParameterType.INT, False,
        ),
        ParameterName.PERF_MGMT_UPLOAD_URL: TrParam(
            DEVICE_PATH + 'FAP.PerfMgmt.Config.1.URL', False, TrParameterType.STRING, 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.STRING, 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,
        ParameterName.CELL_BARRED: transform_for_enb.invert_cell_barred,
        ParameterName.CELL_RESERVED: transform_for_enb.invert_cell_reserved,
    }
    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]:
        return cls.LOAD_PARAMETERS

    @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 BaicellsTrOldConfigurationInitializer(EnodebConfigurationPostProcessor):
    def postprocess(self, mconfig: Any, service_cfg: Any, desired_cfg: EnodebConfiguration) -> None:
        desired_cfg.set_parameter(ParameterName.CELL_BARRED, False)