#
# Copyright (c) 2022 Wind River Systems, Inc.
#
# SPDX-License-Identifier: Apache-2.0
#
import abc

from oslo_log import log as logging

from dcmanager.common import consts
from dcmanager.common import exceptions
from dcmanager.common import prestage
from dcmanager.common import utils
from dcmanager.db import api as db_api
from dcmanager.orchestrator.states.base import BaseState

LOG = logging.getLogger(__name__)


class PrestageState(BaseState):
    """Perform prepare operation"""

    def __init__(self, next_state, region_name):
        super(PrestageState, self).__init__(
            next_state=next_state, region_name=region_name)

    @abc.abstractmethod
    def _do_state_action(self, strategy_step):
        pass

    def perform_state_action(self, strategy_step):
        """Wrapper to ensure proper error handling"""
        try:
            self._do_state_action(strategy_step)
        except exceptions.StrategySkippedException:
            # Move deploy_status back to complete (nothing has changed)
            db_api.subcloud_update(
                self.context, strategy_step.subcloud.id,
                deploy_status=consts.DEPLOY_STATE_DONE)
            raise
        except Exception:
            prestage.prestage_fail(self.context, strategy_step.subcloud.id)
            raise

        # state machine can proceed to the next state
        return self.next_state


class PrestagePreCheckState(PrestageState):
    """Perform pre check operations"""

    def __init__(self, region_name):
        super(PrestagePreCheckState, self).__init__(
            next_state=consts.STRATEGY_STATE_PRESTAGE_PREPARE,
            region_name=region_name)

    @utils.synchronized('prestage-update-extra-args', external=True)
    def _update_oam_floating_ip(self, strategy_step, oam_floating_ip):
        # refresh the extra_args
        extra_args = utils.get_sw_update_strategy_extra_args(self.context)
        if 'oam_floating_ip_dict' in extra_args:
            LOG.debug("Updating oam_floating_ip_dict: %s: %s",
                      strategy_step.subcloud.name, oam_floating_ip)
            oam_floating_ip_dict = extra_args['oam_floating_ip_dict']
            oam_floating_ip_dict[strategy_step.subcloud.name] \
                = oam_floating_ip
        else:
            LOG.debug("Creating oam_floating_ip_dict: %s: %s",
                      strategy_step.subcloud.name, oam_floating_ip)
            oam_floating_ip_dict = {
                strategy_step.subcloud.name: oam_floating_ip
            }
        db_api.sw_update_strategy_update(
            self.context, state=None, update_type=None,
            additional_args={'oam_floating_ip_dict': oam_floating_ip_dict})

    def _do_state_action(self, strategy_step):
        extra_args = utils.get_sw_update_strategy_extra_args(self.context)
        if extra_args is None:
            message = "Prestage pre-check: missing all mandatory arguments"
            self.error_log(strategy_step, message)
            raise Exception(message)

        payload = {
            'sysadmin_password': extra_args['sysadmin_password'],
            'force': extra_args['force']
        }
        try:
            oam_floating_ip = prestage.validate_prestage(
                strategy_step.subcloud, payload)

            self._update_oam_floating_ip(strategy_step, oam_floating_ip)
            if strategy_step.stage == 1:
                # Note: this cleanup happens for every subcloud, but they are all
                # processed before moving on to the next strategy step
                # TODO(kmacleod) although this is a quick check, it is
                # synchronized, so we may want to figure out a better
                # way to only run this once
                prestage.cleanup_failed_preparation()
            prestage.prestage_start(self.context, strategy_step.subcloud.id)

        except exceptions.PrestagePreCheckFailedException as ex:
            # We've either failed precheck or we want to skip this subcloud.
            # Either way, we'll re-raise up to the base class for status
            # update, and then let OrchThread take it from here
            if ex.orch_skip:
                raise exceptions.StrategySkippedException(details=str(ex))

            self.error_log(strategy_step, "Pre-check failed: %s" % ex)
            raise
        else:
            self.info_log(strategy_step, "Pre-check pass")


class PrestagePrepareState(PrestageState):
    """Perform prepare operation"""

    def __init__(self, region_name):
        super(PrestagePrepareState, self).__init__(
            next_state=consts.STRATEGY_STATE_PRESTAGE_PACKAGES,
            region_name=region_name)

    def _do_state_action(self, strategy_step):
        extra_args = utils.get_sw_update_strategy_extra_args(self.context)
        payload = {
            'sysadmin_password': extra_args['sysadmin_password'],
            'oam_floating_ip':
                extra_args['oam_floating_ip_dict'][strategy_step.subcloud.name],
            'force': extra_args['force']
        }
        prestage.prestage_prepare(self.context, strategy_step.subcloud, payload)
        self.info_log(strategy_step, "Prepare finished")


class PrestagePackagesState(PrestageState):
    """Perform prestage packages operation"""

    def __init__(self, region_name):
        super(PrestagePackagesState, self).__init__(
            next_state=consts.STRATEGY_STATE_PRESTAGE_IMAGES,
            region_name=region_name)

    def _do_state_action(self, strategy_step):
        extra_args = utils.get_sw_update_strategy_extra_args(self.context)
        payload = {
            'sysadmin_password': extra_args['sysadmin_password'],
            'oam_floating_ip':
                extra_args['oam_floating_ip_dict'][strategy_step.subcloud.name],
            'force': extra_args['force']
        }
        prestage.prestage_packages(self.context,
                                   strategy_step.subcloud, payload)
        self.info_log(strategy_step, "Packages finished")


class PrestageImagesState(PrestageState):
    """Perform prestage images operation"""

    def __init__(self, region_name):
        super(PrestageImagesState, self).__init__(
            next_state=consts.STRATEGY_STATE_COMPLETE,
            region_name=region_name)

    def _do_state_action(self, strategy_step):
        extra_args = utils.get_sw_update_strategy_extra_args(self.context)
        payload = {
            'sysadmin_password': extra_args['sysadmin_password'],
            'oam_floating_ip':
                extra_args['oam_floating_ip_dict'][strategy_step.subcloud.name],
            'force': extra_args['force']
        }
        prestage.prestage_images(self.context, strategy_step.subcloud, payload)
        self.info_log(strategy_step, "Images finished")
        prestage.prestage_complete(self.context, strategy_step.subcloud.id)