#   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.
#

"""IP Floating action implementations"""

import logging

from openstack import exceptions as sdk_exceptions
from openstack.network.v2 import floating_ip as _floating_ip
from osc_lib import utils

from openstackclient.i18n import _
from openstackclient.identity import common as identity_common
from openstackclient.network import common
from openstackclient.network import sdk_utils


def _get_network_columns(item):
    column_map = {
        'tenant_id': 'project_id',
    }
    return sdk_utils.get_osc_show_columns_for_sdk_resource(item, column_map)


def _get_columns(item):
    columns = list(item.keys())
    if 'tenant_id' in columns:
        columns.remove('tenant_id')
        columns.append('project_id')
    return tuple(sorted(columns))


def _get_attrs(client_manager, parsed_args):
    attrs = {}
    network_client = client_manager.network

    # Name of a network could be empty string.
    if parsed_args.network is not None:
        network = network_client.find_network(parsed_args.network,
                                              ignore_missing=False)
        attrs['floating_network_id'] = network.id

    if parsed_args.subnet:
        subnet = network_client.find_subnet(parsed_args.subnet,
                                            ignore_missing=False)
        attrs['subnet_id'] = subnet.id

    if parsed_args.port:
        port = network_client.find_port(parsed_args.port,
                                        ignore_missing=False)
        attrs['port_id'] = port.id

    if parsed_args.floating_ip_address:
        attrs['floating_ip_address'] = parsed_args.floating_ip_address

    if parsed_args.fixed_ip_address:
        attrs['fixed_ip_address'] = parsed_args.fixed_ip_address

    if parsed_args.description is not None:
        attrs['description'] = parsed_args.description

    if parsed_args.project:
        identity_client = client_manager.identity
        project_id = identity_common.find_project(
            identity_client,
            parsed_args.project,
            parsed_args.project_domain,
        ).id
        attrs['tenant_id'] = project_id

    return attrs


def _find_floating_ip(
    session,
    ip_cache,
    name_or_id,
    ignore_missing=True,
    **params
):
    """Find a floating IP by IP or ID

    The SDK's find_ip() can only locate a floating IP by ID so we have
    to do this ourselves.
    """

    def _get_one_match(name_or_id):
        """Given a list of results, return the match"""
        the_result = None
        for maybe_result in ip_cache:
            id_value = maybe_result.id
            ip_value = maybe_result.floating_ip_address

            if (id_value == name_or_id) or (ip_value == name_or_id):
                # Only allow one resource to be found. If we already
                # found a match, raise an exception to show it.
                if the_result is None:
                    the_result = maybe_result
                else:
                    msg = "More than one %s exists with the name '%s'."
                    msg = (msg % (_floating_ip.FloatingIP, name_or_id))
                    raise sdk_exceptions.DuplicateResource(msg)

        return the_result

    # Try to short-circuit by looking directly for a matching ID.
    try:
        match = _floating_ip.FloatingIP.existing(id=name_or_id, **params)
        return (match.get(session), ip_cache)
    except sdk_exceptions.NotFoundException:
        pass

    if len(ip_cache) == 0:
        ip_cache = list(_floating_ip.FloatingIP.list(session, **params))

    result = _get_one_match(name_or_id)
    if result is not None:
        return (result, ip_cache)

    if ignore_missing:
        return (None, ip_cache)
    raise sdk_exceptions.ResourceNotFound(
        "No %s found for %s" % (_floating_ip.FloatingIP.__name__, name_or_id))


class CreateFloatingIP(common.NetworkAndComputeShowOne):
    _description = _("Create floating IP")

    def update_parser_common(self, parser):
        # In Compute v2 network, floating IPs could be allocated from floating
        # IP pools, which are actually external networks. So deprecate the
        # parameter "pool", and use "network" instead.
        parser.add_argument(
            'network',
            metavar='<network>',
            help=_("Network to allocate floating IP from (name or ID)")
        )
        return parser

    def update_parser_network(self, parser):
        parser.add_argument(
            '--subnet',
            metavar='<subnet>',
            help=_("Subnet on which you want to create the floating IP "
                   "(name or ID)")
        )
        parser.add_argument(
            '--port',
            metavar='<port>',
            help=_("Port to be associated with the floating IP "
                   "(name or ID)")
        )
        parser.add_argument(
            '--floating-ip-address',
            metavar='<floating-ip-address>',
            dest='floating_ip_address',
            help=_("Floating IP address")
        )
        parser.add_argument(
            '--fixed-ip-address',
            metavar='<fixed-ip-address>',
            dest='fixed_ip_address',
            help=_("Fixed IP address mapped to the floating IP")
        )
        parser.add_argument(
            '--description',
            metavar='<description>',
            help=_('Set floating IP description')
        )
        parser.add_argument(
            '--project',
            metavar='<project>',
            help=_("Owner's project (name or ID)")
        )
        identity_common.add_project_domain_option_to_parser(parser)
        return parser

    def take_action_network(self, client, parsed_args):
        attrs = _get_attrs(self.app.client_manager, parsed_args)
        obj = client.create_ip(**attrs)
        display_columns, columns = _get_network_columns(obj)
        data = utils.get_item_properties(obj, columns)
        return (display_columns, data)

    def take_action_compute(self, client, parsed_args):
        obj = client.floating_ips.create(parsed_args.network)
        columns = _get_columns(obj._info)
        data = utils.get_dict_properties(obj._info, columns)
        return (columns, data)


class CreateIPFloating(CreateFloatingIP):
    _description = _("Create floating IP")

    # TODO(tangchen): Remove this class and ``ip floating create`` command
    #                 two cycles after Mitaka.

    # This notifies cliff to not display the help for this command
    deprecated = True

    log = logging.getLogger('deprecated')

    def take_action_network(self, client, parsed_args):
        self.log.warning(_('This command has been deprecated. '
                           'Please use "floating ip create" instead.'))
        return super(CreateIPFloating, self).take_action_network(
            client, parsed_args)

    def take_action_compute(self, client, parsed_args):
        self.log.warning(_('This command has been deprecated. '
                           'Please use "floating ip create" instead.'))
        return super(CreateIPFloating, self).take_action_compute(
            client, parsed_args)


class DeleteFloatingIP(common.NetworkAndComputeDelete):
    _description = _("Delete floating IP(s)")

    # Used by base class to find resources in parsed_args.
    resource = 'floating_ip'
    r = None

    def update_parser_common(self, parser):
        parser.add_argument(
            'floating_ip',
            metavar="<floating-ip>",
            nargs="+",
            help=_("Floating IP(s) to delete (IP address or ID)")
        )
        return parser

    def take_action_network(self, client, parsed_args):
        (obj, self.ip_cache) = _find_floating_ip(
            client.session,
            self.ip_cache,
            self.r,
            ignore_missing=False,
        )
        client.delete_ip(obj)

    def take_action_compute(self, client, parsed_args):
        obj = utils.find_resource(client.floating_ips, self.r)
        client.floating_ips.delete(obj.id)

    def take_action(self, parsed_args):
        """Implements a naive cache for the list of floating IPs"""

        # NOTE(dtroyer): This really only prevents multiple list()
        #                calls when performing multiple resource deletes
        #                in a single command. In an interactive session
        #                each delete command will call list().
        self.ip_cache = []
        super(DeleteFloatingIP, self).take_action(parsed_args)


class DeleteIPFloating(DeleteFloatingIP):
    _description = _("Delete floating IP(s)")

    # TODO(tangchen): Remove this class and ``ip floating delete`` command
    #                 two cycles after Mitaka.

    # This notifies cliff to not display the help for this command
    deprecated = True

    log = logging.getLogger('deprecated')

    def take_action_network(self, client, parsed_args):
        self.log.warning(_('This command has been deprecated. '
                           'Please use "floating ip delete" instead.'))
        return super(DeleteIPFloating, self).take_action_network(
            client, parsed_args)

    def take_action_compute(self, client, parsed_args):
        self.log.warning(_('This command has been deprecated. '
                           'Please use "floating ip delete" instead.'))
        return super(DeleteIPFloating, self).take_action_compute(
            client, parsed_args)


class ListFloatingIP(common.NetworkAndComputeLister):
    # TODO(songminglong): Use SDK resource mapped attribute names once
    # the OSC minimum requirements include SDK 1.0
    _description = _("List floating IP(s)")

    def update_parser_network(self, parser):
        parser.add_argument(
            '--network',
            metavar='<network>',
            help=_("List floating IP(s) according to "
                   "given network (name or ID)")
        )
        parser.add_argument(
            '--port',
            metavar='<port>',
            help=_("List floating IP(s) according to "
                   "given port (name or ID)")
        )
        parser.add_argument(
            '--fixed-ip-address',
            metavar='<fixed-ip-address>',
            help=_("List floating IP(s) according to "
                   "given fixed IP address")
        )
        parser.add_argument(
            '--long',
            action='store_true',
            default=False,
            help=_("List additional fields in output")
        )
        parser.add_argument(
            '--status',
            metavar='<status>',
            choices=['ACTIVE', 'DOWN'],
            help=_("List floating IP(s) according to "
                   "given status ('ACTIVE', 'DOWN')")
        )
        parser.add_argument(
            '--project',
            metavar='<project>',
            help=_("List floating IP(s) according to "
                   "given project (name or ID)")
        )
        identity_common.add_project_domain_option_to_parser(parser)
        parser.add_argument(
            '--router',
            metavar='<router>',
            help=_("List floating IP(s) according to "
                   "given router (name or ID)")
        )

        return parser

    def take_action_network(self, client, parsed_args):
        network_client = self.app.client_manager.network
        identity_client = self.app.client_manager.identity

        columns = (
            'id',
            'floating_ip_address',
            'fixed_ip_address',
            'port_id',
            'floating_network_id',
            'project_id',
        )
        headers = (
            'ID',
            'Floating IP Address',
            'Fixed IP Address',
            'Port',
            'Floating Network',
            'Project',
        )
        if parsed_args.long:
            columns = columns + (
                'router_id',
                'status',
                'description',
            )
            headers = headers + (
                'Router',
                'Status',
                'Description',
            )

        query = {}

        if parsed_args.network is not None:
            network = network_client.find_network(parsed_args.network,
                                                  ignore_missing=False)
            query['floating_network_id'] = network.id
        if parsed_args.port is not None:
            port = network_client.find_port(parsed_args.port,
                                            ignore_missing=False)
            query['port_id'] = port.id
        if parsed_args.fixed_ip_address is not None:
            query['fixed_ip_address'] = parsed_args.fixed_ip_address
        if parsed_args.status:
            query['status'] = parsed_args.status
        if parsed_args.project is not None:
            project = identity_common.find_project(
                identity_client,
                parsed_args.project,
                parsed_args.project_domain,
            )
            query['tenant_id'] = project.id
            query['project_id'] = project.id
        if parsed_args.router is not None:
            router = network_client.find_router(parsed_args.router,
                                                ignore_missing=False)
            query['router_id'] = router.id

        data = client.ips(**query)

        return (headers,
                (utils.get_item_properties(
                    s, columns,
                    formatters={},
                ) for s in data))

    def take_action_compute(self, client, parsed_args):
        columns = (
            'ID',
            'IP',
            'Fixed IP',
            'Instance ID',
            'Pool',
        )
        headers = (
            'ID',
            'Floating IP Address',
            'Fixed IP Address',
            'Server',
            'Pool',
        )

        data = client.floating_ips.list()

        return (headers,
                (utils.get_item_properties(
                    s, columns,
                    formatters={},
                ) for s in data))


class ListIPFloating(ListFloatingIP):
    _description = _("List floating IP(s)")

    # TODO(tangchen): Remove this class and ``ip floating list`` command
    #                 two cycles after Mitaka.

    # This notifies cliff to not display the help for this command
    deprecated = True

    log = logging.getLogger('deprecated')

    def take_action_network(self, client, parsed_args):
        self.log.warning(_('This command has been deprecated. '
                           'Please use "floating ip list" instead.'))
        return super(ListIPFloating, self).take_action_network(
            client, parsed_args)

    def take_action_compute(self, client, parsed_args):
        self.log.warning(_('This command has been deprecated. '
                           'Please use "floating ip list" instead.'))
        return super(ListIPFloating, self).take_action_compute(
            client, parsed_args)


class ShowFloatingIP(common.NetworkAndComputeShowOne):
    _description = _("Display floating IP details")

    # ip_cache is unused here but is a side effect of _find_floating_ip()
    ip_cache = []

    def update_parser_common(self, parser):
        parser.add_argument(
            'floating_ip',
            metavar="<floating-ip>",
            help=_("Floating IP to display (IP address or ID)")
        )
        return parser

    def take_action_network(self, client, parsed_args):
        (obj, self.ip_cache) = _find_floating_ip(
            client.session,
            [],
            parsed_args.floating_ip,
            ignore_missing=False,
        )
        display_columns, columns = _get_network_columns(obj)
        data = utils.get_item_properties(obj, columns)
        return (display_columns, data)

    def take_action_compute(self, client, parsed_args):
        obj = utils.find_resource(
            client.floating_ips,
            parsed_args.floating_ip,
        )
        columns = _get_columns(obj._info)
        data = utils.get_dict_properties(obj._info, columns)
        return (columns, data)


class ShowIPFloating(ShowFloatingIP):
    _description = _("Display floating IP details")

    # TODO(tangchen): Remove this class and ``ip floating show`` command
    #                 two cycles after Mitaka.

    # This notifies cliff to not display the help for this command
    deprecated = True

    log = logging.getLogger('deprecated')

    def take_action_network(self, client, parsed_args):
        self.log.warning(_('This command has been deprecated. '
                           'Please use "floating ip show" instead.'))
        return super(ShowIPFloating, self).take_action_network(
            client, parsed_args)

    def take_action_compute(self, client, parsed_args):
        self.log.warning(_('This command has been deprecated. '
                           'Please use "floating ip show" instead.'))
        return super(ShowIPFloating, self).take_action_compute(
            client, parsed_args)