# Copyright 2013 Hewlett-Packard Development Company, L.P.
# All Rights Reserved.
#
#    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.

"""
Baremetal interface (v2 extension).
"""

from novaclient import base
from novaclient.i18n import _
from novaclient.openstack.common import cliutils
from novaclient import utils


class BareMetalNode(base.Resource):
    """
    A baremetal node (typically a physical server or an empty VM).
    """

    def __repr__(self):
        return "<BareMetalNode: %s>" % self.id


class BareMetalNodeInterface(base.Resource):
    """
    An interface belonging to a baremetal node.
    """

    def __repr__(self):
        return "<BareMetalNodeInterface: %s>" % self.id


class BareMetalNodeManager(base.ManagerWithFind):
    """
    Manage :class:`BareMetalNode` resources.
    """
    resource_class = BareMetalNode

    def create(self,
               service_host,
               cpus,
               memory_mb,
               local_gb,
               prov_mac_address,
               pm_address=None,
               pm_user=None,
               pm_password=None,
               terminal_port=None):
        """
        Create a baremetal node.

        :param service_host: Name of controlling compute host
        :param cpus: Number of CPUs in the node
        :param memory_mb: Megabytes of RAM in the node
        :param local_gb: Gigabytes of local storage in the node
        :param pm_address: Power management IP for the node
        :param pm_user: Username for the node's power management
        :param pm_password: Password for the node's power management
        :param prov_mac_address: MAC address to provision the node
        :param terminal_port: ShellInABox port
        :rtype: :class:`BareMetalNode`
        """
        body = {'node': {'service_host': service_host,
                         'cpus': cpus,
                         'memory_mb': memory_mb,
                         'local_gb': local_gb,
                         'pm_address': pm_address,
                         'pm_user': pm_user,
                         'pm_password': pm_password,
                         'prov_mac_address': prov_mac_address,
                         'terminal_port': terminal_port}}

        return self._create('/os-baremetal-nodes', body, 'node')

    def delete(self, node):
        """
        Delete a baremetal node.

        :param node: The :class:`BareMetalNode` to delete.
        """
        self._delete('/os-baremetal-nodes/%s' % base.getid(node))

    def get(self, node_id):
        """
        Get a baremetal node.

        :param node_id: The ID of the node to delete.
        :rtype: :class:`BareMetalNode`
        """
        return self._get("/os-baremetal-nodes/%s" % node_id, 'node')

    def list(self):
        """
        Get a list of all baremetal nodes.

        :rtype: list of :class:`BareMetalNode`
        """
        return self._list('/os-baremetal-nodes', 'nodes')

    def add_interface(self, node_id, address, datapath_id=0, port_no=0):
        """
        Add an interface to a baremetal node.

        :param node_id: The ID of the node to modify.
        :param address: The MAC address to add.
        :param datapath_id: Datapath ID of OpenFlow switch for the interface
        :param port_no: OpenFlow port number for the interface
        :rtype: :class:`BareMetalNodeInterface`
        """
        body = {'add_interface': {'address': address,
                                  'datapath_id': datapath_id,
                                  'port_no': port_no}}
        url = '/os-baremetal-nodes/%s/action' % node_id
        _resp, body = self.api.client.post(url, body=body)
        return BareMetalNodeInterface(self, body['interface'])

    def remove_interface(self, node_id, address):
        """
        Remove an interface from a baremetal node.

        :param node_id: The ID of the node to modify.
        :param address: The MAC address to remove.
        :rtype: bool
        """
        req_body = {'remove_interface': {'address': address}}
        url = '/os-baremetal-nodes/%s/action' % node_id
        self.api.client.post(url, body=req_body)

    def list_interfaces(self, node_id):
        """
        List the interfaces on a baremetal node.

        :param node_id: The ID of the node to list.
        :rtype: list
        """
        interfaces = []
        node = self._get("/os-baremetal-nodes/%s" % node_id, 'node')
        for interface in node.interfaces:
            interface_object = BareMetalNodeInterface(self, interface)
            interfaces.append(interface_object)
        return interfaces


@cliutils.arg(
    'service_host',
    metavar='<service_host>',
    help=_('Name of nova compute host which will control this baremetal '
           'node'))
@cliutils.arg(
    'cpus',
    metavar='<cpus>',
    type=int,
    help=_('Number of CPUs in the node'))
@cliutils.arg(
    'memory_mb',
    metavar='<memory_mb>',
    type=int,
    help=_('Megabytes of RAM in the node'))
@cliutils.arg(
    'local_gb',
    metavar='<local_gb>',
    type=int,
    help=_('Gigabytes of local storage in the node'))
@cliutils.arg(
    'prov_mac_address',
    metavar='<prov_mac_address>',
    help=_('MAC address to provision the node'))
@cliutils.arg(
    '--pm_address', default=None,
    metavar='<pm_address>',
    help=_('Power management IP for the node'))
@cliutils.arg(
    '--pm_user', default=None,
    metavar='<pm_user>',
    help=_('Username for the node\'s power management'))
@cliutils.arg(
    '--pm_password', default=None,
    metavar='<pm_password>',
    help=_('Password for the node\'s power management'))
@cliutils.arg(
    '--terminal_port', default=None,
    metavar='<terminal_port>',
    type=int,
    help=_('ShellInABox port?'))
def do_baremetal_node_create(cs, args):
    """Create a baremetal node."""
    node = cs.baremetal.create(args.service_host, args.cpus,
                               args.memory_mb, args.local_gb,
                               args.prov_mac_address,
                               pm_address=args.pm_address,
                               pm_user=args.pm_user,
                               pm_password=args.pm_password,
                               terminal_port=args.terminal_port)
    _print_baremetal_resource(node)


@cliutils.arg(
    'node',
    metavar='<node>',
    help=_('ID of the node to delete.'))
def do_baremetal_node_delete(cs, args):
    """Remove a baremetal node and any associated interfaces."""
    node = _find_baremetal_node(cs, args.node)
    cs.baremetal.delete(node)


def _translate_baremetal_node_keys(collection):
    convert = [('service_host', 'host'),
               ('local_gb', 'disk_gb'),
               ('prov_mac_address', 'mac_address'),
               ('pm_address', 'pm_address'),
               ('pm_user', 'pm_username'),
               ('pm_password', 'pm_password'),
               ('terminal_port', 'terminal_port'),
               ]
    for item in collection:
        keys = item.__dict__.keys()
        for from_key, to_key in convert:
            if from_key in keys and to_key not in keys:
                setattr(item, to_key, item._info[from_key])


def _print_baremetal_nodes_list(nodes):
    """Print the list of baremetal nodes."""

    def _parse_address(fields):
        macs = []
        for interface in fields.interfaces:
            macs.append(interface['address'])
        return ', '.join("%s" % i for i in macs)

    formatters = {
        'MAC Address': _parse_address
    }

    _translate_baremetal_node_keys(nodes)
    utils.print_list(nodes, [
        'ID',
        'Host',
        'Task State',
        'CPUs',
        'Memory_MB',
        'Disk_GB',
        'MAC Address',
        'PM Address',
        'PM Username',
        'PM Password',
        'Terminal Port',
    ], formatters=formatters)


def do_baremetal_node_list(cs, _args):
    """Print list of available baremetal nodes."""
    nodes = cs.baremetal.list()
    _print_baremetal_nodes_list(nodes)


def _find_baremetal_node(cs, node):
    """Get a node by ID."""
    return utils.find_resource(cs.baremetal, node)


def _print_baremetal_resource(resource):
    """Print details of a baremetal resource."""
    info = resource._info.copy()
    utils.print_dict(info)


def _print_baremetal_node_interfaces(interfaces):
    """Print interfaces of a baremetal node."""
    utils.print_list(interfaces, [
        'ID',
        'Datapath_ID',
        'Port_No',
        'Address',
    ])


@cliutils.arg(
    'node',
    metavar='<node>',
    help=_("ID of node"))
def do_baremetal_node_show(cs, args):
    """Show information about a baremetal node."""
    node = _find_baremetal_node(cs, args.node)
    _print_baremetal_resource(node)


@cliutils.arg(
    'node',
    metavar='<node>',
    help=_("ID of node"))
@cliutils.arg(
    'address',
    metavar='<address>',
    help=_("MAC address of interface"))
@cliutils.arg(
    '--datapath_id',
    default=0,
    metavar='<datapath_id>',
    help=_("OpenFlow Datapath ID of interface"))
@cliutils.arg(
    '--port_no',
    default=0,
    metavar='<port_no>',
    help=_("OpenFlow port number of interface"))
def do_baremetal_interface_add(cs, args):
    """Add a network interface to a baremetal node."""
    bmif = cs.baremetal.add_interface(args.node, args.address,
                                      args.datapath_id, args.port_no)
    _print_baremetal_resource(bmif)


@cliutils.arg('node', metavar='<node>', help=_("ID of node"))
@cliutils.arg(
    'address',
    metavar='<address>',
    help=_("MAC address of interface"))
def do_baremetal_interface_remove(cs, args):
    """Remove a network interface from a baremetal node."""
    cs.baremetal.remove_interface(args.node, args.address)


@cliutils.arg('node', metavar='<node>', help=_("ID of node"))
def do_baremetal_interface_list(cs, args):
    """List network interfaces associated with a baremetal node."""
    interfaces = cs.baremetal.list_interfaces(args.node)
    _print_baremetal_node_interfaces(interfaces)
