# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# 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.
"""
Redfish Inspect Interface
"""

from oslo_log import log
from oslo_utils import units
import sushy

from ironic.common import boot_modes
from ironic.common import exception
from ironic.common.i18n import _
from ironic.common.inspection_rules import engine
from ironic.common import states
from ironic.common import utils
from ironic.conf import CONF
from ironic.drivers import base
from ironic.drivers.modules import inspect_utils
from ironic.drivers.modules.redfish import utils as redfish_utils
from ironic.drivers import utils as drivers_utils

LOG = log.getLogger(__name__)

PROCESSOR_INSTRUCTION_SET_MAP = {
    sushy.InstructionSet.ARM_A32: 'arm',
    sushy.InstructionSet.ARM_A64: 'aarch64',
    sushy.InstructionSet.IA_64: 'ia64',
    sushy.InstructionSet.MIPS32: 'mips',
    sushy.InstructionSet.MIPS64: 'mips64',
    sushy.InstructionSet.OEM: None,
    sushy.InstructionSet.X86: 'i686',
    sushy.InstructionSet.X86_64: 'x86_64'
}

BOOT_MODE_MAP = {
    sushy.BOOT_SOURCE_MODE_UEFI: boot_modes.UEFI,
    sushy.BOOT_SOURCE_MODE_BIOS: boot_modes.LEGACY_BIOS
}


class RedfishInspect(base.InspectInterface):

    def __init__(self):
        super().__init__()
        enabled_hooks = [x.strip()
                         for x in CONF.redfish.inspection_hooks.split(',')
                         if x.strip()]
        self.hooks = inspect_utils.validate_inspection_hooks("redfish",
                                                             enabled_hooks)

    def get_properties(self):
        """Return the properties of the interface.

        :returns: dictionary of <property name>:<property description> entries.
        """
        return redfish_utils.COMMON_PROPERTIES.copy()

    def validate(self, task):
        """Validate the driver-specific Node deployment info.

        This method validates whether the 'driver_info' properties of
        the task's node contains the required information for this
        interface to function.

        This method is often executed synchronously in API requests, so it
        should not conduct long-running checks.

        :param task: A TaskManager instance containing the node to act on.
        :raises: InvalidParameterValue on malformed parameter(s)
        :raises: MissingParameterValue on missing parameter(s)
        """
        redfish_utils.parse_driver_info(task.node)

    def inspect_hardware(self, task):
        """Inspect hardware to get the hardware properties.

        Inspects hardware to get the essential properties.
        It fails if any of the essential properties
        are not received from the node.

        :param task: a TaskManager instance.
        :raises: HardwareInspectionFailure if essential properties
                 could not be retrieved successfully.
        :returns: The resulting state of inspection.

        """
        system = redfish_utils.get_system(task.node)

        # get the essential properties and update the node properties
        # with it.
        inspected_properties = task.node.properties
        inventory = {}

        if system.memory_summary and system.memory_summary.size_gib:
            memory = system.memory_summary.size_gib * units.Ki
            inspected_properties['memory_mb'] = memory
            inventory['memory'] = {'physical_mb': memory}

        # match the inventory data of ironic-inspector / ironic-python-agent
        # to make existing inspection hooks and rules work by defaulting
        # the values
        inventory['cpu'] = {
            'count': 0,
            'architecture': '',
        }
        proc_info = self._get_processor_info(task, system)
        inventory['cpu'].update(proc_info)

        # TODO(etingof): should we respect root device hints here?
        local_gb = self._detect_local_gb(task, system)

        if local_gb:
            inspected_properties['local_gb'] = str(local_gb)

        else:
            LOG.warning("Could not provide a valid storage size configured "
                        "for node %(node)s. Assuming this is a disk-less node",
                        {'node': task.node.uuid})
            inspected_properties['local_gb'] = '0'

        if storages := system.storage or system.simple_storage:
            disks = list()
            for storage in storages.get_members():
                drives = storage.drives if hasattr(
                    storage, 'drives') else storage.devices
                for drive in drives:
                    disk = {}
                    disk['name'] = drive.name
                    disk['size'] = drive.capacity_bytes
                    disks.append(disk)

            inventory['disks'] = disks

        if system.ethernet_interfaces and system.ethernet_interfaces.summary:
            inventory['interfaces'] = []
            for eth in system.ethernet_interfaces.get_members():
                iface = {'mac_address': utils.normalize_mac(eth.mac_address),
                         'name': eth.identity}
                inventory['interfaces'].append(iface)

        system_vendor = {}
        if system.model:
            system_vendor['product_name'] = str(system.model)

        if system.serial_number:
            system_vendor['serial_number'] = str(system.serial_number)

        if system.manufacturer:
            system_vendor['manufacturer'] = str(system.manufacturer)

        if system_vendor:
            inventory['system_vendor'] = system_vendor

        if system.boot.mode:
            if not drivers_utils.get_node_capability(task.node, 'boot_mode'):
                capabilities = utils.get_updated_capabilities(
                    inspected_properties.get('capabilities', ''),
                    {'boot_mode': BOOT_MODE_MAP[system.boot.mode]})

                inspected_properties['capabilities'] = capabilities
            inventory['boot'] = {'current_boot_mode':
                                 BOOT_MODE_MAP[system.boot.mode]}

        self._create_ports(task, system)

        pxe_port_macs = self._get_pxe_port_macs(task)
        # existing data format only allows one mac so use that for now
        if pxe_port_macs:
            inventory['boot']['pxe_interface'] = pxe_port_macs[0]

        plugin_data = {}

        inspect_utils.run_inspection_hooks(task, inventory, plugin_data,
                                           self.hooks, None)
        inspect_utils.store_inspection_data(task.node,
                                            inventory,
                                            plugin_data,
                                            task.context)
        engine.apply_rules(task, inventory, plugin_data, 'main')

        valid_keys = self.ESSENTIAL_PROPERTIES
        missing_keys = valid_keys - set(inspected_properties)
        if missing_keys:
            error = (_('Failed to discover the following properties: '
                       '%(missing_keys)s on node %(node)s') %
                     {'missing_keys': ', '.join(missing_keys),
                      'node': task.node.uuid})
            raise exception.HardwareInspectionFailure(error=error)

        task.node.properties = inspected_properties
        task.node.save()
        LOG.debug("Node properties for %(node)s are updated as "
                  "%(properties)s", {'properties': inspected_properties,
                                     'node': task.node.uuid})

        return states.MANAGEABLE

    def _create_ports(self, task, system):
        enabled_macs = redfish_utils.get_enabled_macs(task, system)
        if enabled_macs:
            inspect_utils.create_ports_if_not_exist(task, list(enabled_macs))
        else:
            LOG.warning("Not attempting to create any port as no NICs "
                        "were discovered in 'enabled' state for node "
                        "%(node)s: %(mac_data)s",
                        {'mac_data': enabled_macs, 'node': task.node.uuid})

    def _detect_local_gb(self, task, system):
        simple_storage_size = 0

        try:
            LOG.debug("Attempting to discover system simple storage size for "
                      "node %(node)s", {'node': task.node.uuid})
            if (system.simple_storage
                    and system.simple_storage.disks_sizes_bytes):
                simple_storage_size = [
                    size for size in system.simple_storage.disks_sizes_bytes
                    if size >= 4 * units.Gi
                ] or [0]

                simple_storage_size = simple_storage_size[0]

        except sushy.exceptions.SushyError as ex:
            LOG.debug("No simple storage information discovered "
                      "for node %(node)s: %(err)s", {'node': task.node.uuid,
                                                     'err': ex})

        storage_size = 0

        try:
            LOG.debug("Attempting to discover system storage volume size for "
                      "node %(node)s", {'node': task.node.uuid})
            if system.storage and system.storage.volumes_sizes_bytes:
                storage_size = [
                    size for size in system.storage.volumes_sizes_bytes
                    if size >= 4 * units.Gi
                ] or [0]

                storage_size = storage_size[0]

        except sushy.exceptions.SushyError as ex:
            LOG.debug("No storage volume information discovered "
                      "for node %(node)s: %(err)s", {'node': task.node.uuid,
                                                     'err': ex})

        try:
            if not storage_size:
                LOG.debug("Attempting to discover system storage drive size "
                          "for node %(node)s", {'node': task.node.uuid})
                if system.storage and system.storage.drives_sizes_bytes:
                    storage_size = [
                        size for size in system.storage.drives_sizes_bytes
                        if size >= 4 * units.Gi
                    ] or [0]

                    storage_size = storage_size[0]

        except sushy.exceptions.SushyError as ex:
            LOG.debug("No storage drive information discovered "
                      "for node %(node)s: %(err)s", {'node': task.node.uuid,
                                                     'err': ex})

        # NOTE(etingof): pick the smallest disk larger than 4G among available
        if simple_storage_size and storage_size:
            local_gb = min(simple_storage_size, storage_size)

        else:
            local_gb = max(simple_storage_size, storage_size)

        # Note(deray): Convert the received size to GiB and reduce the
        # value by 1 GB as consumers like Ironic requires the ``local_gb``
        # to be returned 1 less than actual size.
        return max(0, int(local_gb / units.Gi - 1))

    def _get_pxe_port_macs(self, task):
        """Get a list of PXE port MAC addresses.

        :param task: a TaskManager instance.
        :returns: Returns list of PXE port MAC addresses.
                  If cannot be determined, returns None.
        """
        return None

    def _get_processor_info(self, task, system):
        # NOTE(JayF): Checking truthiness here is better than checking for None
        #             because if we have an empty list, we'll raise a
        #             ValueError.
        cpu = {}

        if not system.processors:
            return cpu

        if system.processors.summary:
            cpu['count'], _ = system.processors.summary

        processor = system.processors.get_members()[0]

        if processor.model is not None:
            cpu['model_name'] = str(processor.model)
        if processor.max_speed_mhz is not None:
            cpu['frequency'] = processor.max_speed_mhz
        cpu['architecture'] = PROCESSOR_INSTRUCTION_SET_MAP.get(
            processor.instruction_set) or ''

        return cpu
