#   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.
#

"""Identity v3 Trust action implementations"""

import datetime
import logging
import six

from cliff import command
from cliff import lister
from cliff import show

from openstackclient.common import utils
from openstackclient.identity import common


class CreateTrust(show.ShowOne):
    """Create new trust"""

    log = logging.getLogger(__name__ + '.CreateTrust')

    def get_parser(self, prog_name):
        parser = super(CreateTrust, self).get_parser(prog_name)
        parser.add_argument(
            'trustor',
            metavar='<trustor-user>',
            help='User that is delegating authorization (name or ID)',
        )
        parser.add_argument(
            'trustee',
            metavar='<trustee-user>',
            help='User that is assuming authorization (name or ID)',
        )
        parser.add_argument(
            '--project',
            metavar='<project>',
            required=True,
            help='Project being delegated (name or ID) (required)',
        )
        parser.add_argument(
            '--role',
            metavar='<role>',
            action='append',
            default=[],
            help='Roles to authorize (name or ID) '
                 '(repeat to set multiple values) (required)',
            required=True
        )
        parser.add_argument(
            '--impersonate',
            dest='impersonate',
            action='store_true',
            default=False,
            help='Tokens generated from the trust will represent <trustor>'
                 ' (defaults to False)',
        )
        parser.add_argument(
            '--expiration',
            metavar='<expiration>',
            help='Sets an expiration date for the trust'
                 ' (format of YYYY-mm-ddTHH:MM:SS)',
        )
        common.add_project_domain_option_to_parser(parser)
        parser.add_argument(
            '--trustor-domain',
            metavar='<trustor-domain>',
            help='Domain that contains <trustor> (name or ID)',
        )
        parser.add_argument(
            '--trustee-domain',
            metavar='<trustee-domain>',
            help='Domain that contains <trustee> (name or ID)',
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)' % parsed_args)
        identity_client = self.app.client_manager.identity

        # NOTE(stevemar): Find the two users, project and roles that
        # are necessary for making a trust usable, the API dictates that
        # trustee, project and role are optional, but that makes the trust
        # pointless, and trusts are immutable, so let's enforce it at the
        # client level.
        trustor_id = common.find_user(identity_client,
                                      parsed_args.trustor,
                                      parsed_args.trustor_domain).id
        trustee_id = common.find_user(identity_client,
                                      parsed_args.trustee,
                                      parsed_args.trustee_domain).id
        project_id = common.find_project(identity_client,
                                         parsed_args.project,
                                         parsed_args.project_domain).id

        role_names = []
        for role in parsed_args.role:
            role_name = utils.find_resource(
                identity_client.roles,
                role,
            ).name
            role_names.append(role_name)

        expires_at = None
        if parsed_args.expiration:
            expires_at = datetime.datetime.strptime(parsed_args.expiration,
                                                    '%Y-%m-%dT%H:%M:%S')

        trust = identity_client.trusts.create(
            trustee_id, trustor_id,
            impersonation=parsed_args.impersonate,
            project=project_id,
            role_names=role_names,
            expires_at=expires_at,
        )

        trust._info.pop('roles_links', None)
        trust._info.pop('links', None)

        # Format roles into something sensible
        roles = trust._info.pop('roles')
        msg = ' '.join(r['name'] for r in roles)
        trust._info['roles'] = msg

        return zip(*sorted(six.iteritems(trust._info)))


class DeleteTrust(command.Command):
    """Delete trust(s)"""

    log = logging.getLogger(__name__ + '.DeleteTrust')

    def get_parser(self, prog_name):
        parser = super(DeleteTrust, self).get_parser(prog_name)
        parser.add_argument(
            'trust',
            metavar='<trust>',
            help='Trust(s) to delete',
            nargs="+",
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)' % parsed_args)
        identity_client = self.app.client_manager.identity
        for t in parsed_args.trust:
            trust_obj = utils.find_resource(identity_client.trusts, t)
            identity_client.trusts.delete(trust_obj.id)


class ListTrust(lister.Lister):
    """List trusts"""

    log = logging.getLogger(__name__ + '.ListTrust')

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)' % parsed_args)
        columns = ('ID', 'Expires At', 'Impersonation', 'Project ID',
                   'Trustee User ID', 'Trustor User ID')
        data = self.app.client_manager.identity.trusts.list()
        return (columns,
                (utils.get_item_properties(
                    s, columns,
                    formatters={},
                ) for s in data))


class ShowTrust(show.ShowOne):
    """Display trust details"""

    log = logging.getLogger(__name__ + '.ShowTrust')

    def get_parser(self, prog_name):
        parser = super(ShowTrust, self).get_parser(prog_name)
        parser.add_argument(
            'trust',
            metavar='<trust>',
            help='Trust to display',
        )
        return parser

    def take_action(self, parsed_args):
        self.log.debug('take_action(%s)' % parsed_args)
        identity_client = self.app.client_manager.identity
        trust = utils.find_resource(identity_client.trusts,
                                    parsed_args.trust)

        trust._info.pop('roles_links', None)
        trust._info.pop('links', None)

        # Format roles into something sensible
        roles = trust._info.pop('roles')
        msg = ' '.join(r['name'] for r in roles)
        trust._info['roles'] = msg

        return zip(*sorted(six.iteritems(trust._info)))
