#   Copyright 2016 Red Hat, Inc.
#
#   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.
#

import logging
import os
import yaml

from osc_lib import exceptions as oscexc
from osc_lib.i18n import _
from osc_lib import utils as osc_utils

from tripleoclient import command
from tripleoclient import constants
from tripleoclient import utils


class DeleteOvercloud(command.Command):
    """Delete overcloud stack and plan"""

    log = logging.getLogger(__name__ + ".DeleteOvercloud")

    def get_parser(self, prog_name):
        parser = super(DeleteOvercloud, self).get_parser(prog_name)
        parser.add_argument('stack', nargs='?',
                            help=_('Name or ID of heat stack to delete'
                                   '(default=Env: OVERCLOUD_STACK_NAME)'),
                            default=osc_utils.env('OVERCLOUD_STACK_NAME'))
        parser.add_argument('-y', '--yes',
                            help=_('Skip yes/no prompt (assume yes).'),
                            default=False,
                            action="store_true")
        parser.add_argument('-s', '--skip-ipa-cleanup',
                            help=_('Skip removing overcloud hosts, services, '
                                   'and DNS records from FreeIPA. This is '
                                   'particularly relevant for deployments '
                                   'using certificates from FreeIPA for TLS. '
                                   'By default, overcloud hosts, services, '
                                   'and DNS records will be removed from '
                                   'FreeIPA before deleting the overcloud. '
                                   'Using this option might require you to '
                                   'manually cleanup FreeIPA later.'),
                            default=False,
                            action="store_true")
        parser.add_argument('-b', '--baremetal-deployment',
                            metavar='<baremetal_deployment.yaml>',
                            help=_('Configuration file describing the '
                                   'baremetal deployment'))
        parser.add_argument('--networks-file',
                            metavar='<network_data.yaml>',
                            help=_('Configuration file describing the '
                                   'network deployment to enable '
                                   'unprovisioning of networks.'))
        parser.add_argument('--network-ports',
                            help=_('Enable unprovisioning of network ports'),
                            default=False,
                            action="store_true")
        parser.add_argument(
            '--heat-type',
            action='store',
            default='pod',
            choices=['installed', 'pod', 'container', 'native'],
            help=_('The type of Heat process that was used to execute'
                   'the deployment.\n'
                   'pod (Default): Use an ephemeral Heat pod.\n'
                   'installed: Use the system installed Heat.\n'
                   'container: Use an ephemeral Heat container.\n'
                   'native: Use an ephemeral Heat process.')
        )
        return parser

    def _validate_args(self, parsed_args):
        if parsed_args.stack in (None, ''):
            raise oscexc.CommandError("You must specify a stack name")
        if parsed_args.networks_file:
            networks_file_path = os.path.abspath(parsed_args.networks_file)
            if not os.path.exists(networks_file_path):
                raise oscexc.CommandError(
                    "Network configuration file does not exist:"
                    " {args}".format(args=parsed_args.networks_file))

    def take_action(self, parsed_args):
        self.log.debug("take_action({args})".format(args=parsed_args))

        self._validate_args(parsed_args)

        if not parsed_args.yes:
            confirm = utils.prompt_user_for_confirmation(
                message=_("Are you sure you want to delete this overcloud "
                          "[y/N]? "),
                logger=self.log)
            if not confirm:
                raise oscexc.CommandError("Action not confirmed, exiting.")

        if parsed_args.skip_ipa_cleanup:
            playbooks = ["cli-overcloud-delete.yaml"]
        else:
            # Order is important, let's make sure we cleanup FreeIPA before we
            # start removing infrastructure.
            playbooks = ["cli-cleanup-ipa.yml", "cli-overcloud-delete.yaml"]

        heat_stack_delete = parsed_args.heat_type in ["installed", "native"]

        with utils.TempDirs() as tmp:
            utils.run_ansible_playbook(
                playbooks,
                constants.ANSIBLE_INVENTORY.format(parsed_args.stack),
                workdir=tmp,
                playbook_dir=constants.ANSIBLE_TRIPLEO_PLAYBOOKS,
                verbosity=utils.playbook_verbosity(self=self),
                extra_vars={
                    "stack_name": parsed_args.stack,
                    "heat_stack_delete": heat_stack_delete
                }
            )

        if parsed_args.baremetal_deployment:
            with open(parsed_args.baremetal_deployment, 'r') as fp:
                roles = yaml.safe_load(fp)

            with utils.TempDirs() as tmp:
                utils.run_ansible_playbook(
                    playbook='cli-overcloud-node-unprovision.yaml',
                    workdir=tmp,
                    inventory='localhost,',
                    playbook_dir=constants.ANSIBLE_TRIPLEO_PLAYBOOKS,
                    verbosity=utils.playbook_verbosity(self=self),
                    extra_vars={
                        "stack_name": parsed_args.stack,
                        "baremetal_deployment": roles,
                        "all": True,
                        "prompt": False,
                        "manage_network_ports": parsed_args.network_ports,
                    }
                )

        if parsed_args.networks_file:
            networks_file_path = os.path.abspath(parsed_args.networks_file)

            with utils.TempDirs() as tmp:
                utils.run_ansible_playbook(
                    playbook='cli-overcloud-network-unprovision.yaml',
                    inventory='localhost,',
                    workdir=tmp,
                    playbook_dir=constants.ANSIBLE_TRIPLEO_PLAYBOOKS,
                    verbosity=utils.playbook_verbosity(self=self),
                    extra_vars={
                        "network_data_path": networks_file_path
                    }
                )
        print("Success.")