# Copyright 2013 Hewlett-Packard Development Company, L.P.
#
#    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 os

from oslo_utils import strutils

from ironicclient.common import base
from ironicclient.common.i18n import _
from ironicclient.common import utils
from ironicclient import exc


_power_states = {
    'on': 'power on',
    'off': 'power off',
    'reboot': 'rebooting',
}


class Node(base.Resource):
    def __repr__(self):
        return "<Node %s>" % self._info


class NodeManager(base.CreateManager):
    resource_class = Node
    _creation_attributes = ['chassis_uuid', 'driver', 'driver_info',
                            'extra', 'uuid', 'properties', 'name']
    _resource_name = 'nodes'

    def list(self, associated=None, maintenance=None, marker=None, limit=None,
             detail=False, sort_key=None, sort_dir=None, fields=None,
             provision_state=None):
        """Retrieve a list of nodes.

        :param associated: Optional. Either a Boolean or a string
                           representation of a Boolean that indicates whether
                           to return a list of associated (True or "True") or
                           unassociated (False or "False") nodes.
        :param maintenance: Optional. Either a Boolean or a string
                            representation of a Boolean that indicates whether
                            to return nodes in maintenance mode (True or
                            "True"), or not in maintenance mode (False or
                            "False").
        :param provision_state: Optional. String value to get only nodes in
                                that provision state.
        :param marker: Optional, the UUID of a node, eg the last
                       node from a previous result set. Return
                       the next result set.
        :param limit: The maximum number of results to return per
                      request, if:

            1) limit > 0, the maximum number of nodes to return.
            2) limit == 0, return the entire list of nodes.
            3) limit param is NOT specified (None), the number of items
               returned respect the maximum imposed by the Ironic API
               (see Ironic's api.max_limit option).

        :param detail: Optional, boolean whether to return detailed information
                       about nodes.

        :param sort_key: Optional, field used for sorting.

        :param sort_dir: Optional, direction of sorting, either 'asc' (the
                         default) or 'desc'.

        :param fields: Optional, a list with a specified set of fields
                       of the resource to be returned. Can not be used
                       when 'detail' is set.

        :returns: A list of nodes.

        """
        if limit is not None:
            limit = int(limit)

        if detail and fields:
            raise exc.InvalidAttribute(_("Can't fetch a subset of fields "
                                         "with 'detail' set"))

        filters = utils.common_filters(marker, limit, sort_key, sort_dir,
                                       fields)
        if associated is not None:
            filters.append('associated=%s' % associated)
        if maintenance is not None:
            filters.append('maintenance=%s' % maintenance)
        if provision_state is not None:
            filters.append('provision_state=%s' % provision_state)

        path = ''
        if detail:
            path += 'detail'
        if filters:
            path += '?' + '&'.join(filters)

        if limit is None:
            return self._list(self._path(path), "nodes")
        else:
            return self._list_pagination(self._path(path), "nodes",
                                         limit=limit)

    def list_ports(self, node_id, marker=None, limit=None, sort_key=None,
                   sort_dir=None, detail=False, fields=None):
        """List all the ports for a given node.

        :param node_id: Name or UUID of the node.
        :param marker: Optional, the UUID of a port, eg the last
                       port from a previous result set. Return
                       the next result set.
        :param limit: The maximum number of results to return per
                      request, if:

            1) limit > 0, the maximum number of ports to return.
            2) limit == 0, return the entire list of ports.
            3) limit param is NOT specified (None), the number of items
               returned respect the maximum imposed by the Ironic API
               (see Ironic's api.max_limit option).

        :param sort_key: Optional, field used for sorting.

        :param sort_dir: Optional, direction of sorting, either 'asc' (the
                         default) or 'desc'.

        :param detail: Optional, boolean whether to return detailed information
                       about ports.

        :param fields: Optional, a list with a specified set of fields
                       of the resource to be returned. Can not be used
                       when 'detail' is set.

        :returns: A list of ports.

        """
        if limit is not None:
            limit = int(limit)

        if detail and fields:
            raise exc.InvalidAttribute(_("Can't fetch a subset of fields "
                                         "with 'detail' set"))

        filters = utils.common_filters(marker, limit, sort_key, sort_dir,
                                       fields)

        path = "%s/ports" % node_id
        if detail:
            path += '/detail'

        if filters:
            path += '?' + '&'.join(filters)

        if limit is None:
            return self._list(self._path(path), "ports")
        else:
            return self._list_pagination(self._path(path), "ports",
                                         limit=limit)

    def get(self, node_id, fields=None):
        return self._get(resource_id=node_id, fields=fields)

    def get_by_instance_uuid(self, instance_uuid, fields=None):
        path = '?instance_uuid=%s' % instance_uuid
        if fields is not None:
            path += '&fields=' + ','.join(fields)
        else:
            path = 'detail' + path

        nodes = self._list(self._path(path), 'nodes')
        # get all the details of the node assuming that
        # filtering by instance_uuid returns a collection
        # of one node if successful.
        if len(nodes) == 1:
            return nodes[0]
        else:
            raise exc.NotFound()

    def delete(self, node_id):
        return self._delete(resource_id=node_id)

    def update(self, node_id, patch, http_method='PATCH'):
        return self._update(resource_id=node_id, patch=patch,
                            method=http_method)

    def vendor_passthru(self, node_id, method, args=None,
                        http_method=None):
        """Issue requests for vendor-specific actions on a given node.

        :param node_id: The UUID of the node.
        :param method: Name of the vendor method.
        :param args: Optional. The arguments to be passed to the method.
        :param http_method: The HTTP method to use on the request.
                            Defaults to POST.
        """
        if args is None:
            args = {}

        if http_method is None:
            http_method = 'POST'

        http_method = http_method.upper()

        path = "%s/vendor_passthru/%s" % (node_id, method)
        if http_method in ('POST', 'PUT', 'PATCH'):
            return self.update(path, args, http_method=http_method)
        elif http_method == 'DELETE':
            return self.delete(path)
        elif http_method == 'GET':
            return self.get(path)
        else:
            raise exc.InvalidAttribute(
                _('Unknown HTTP method: %s') % http_method)

    def set_maintenance(self, node_id, state, maint_reason=None):
        """Set the maintenance mode for the node.

        :param node_id: The UUID of the node.
        :param state: the maintenance mode; either a Boolean or a string
                      representation of a Boolean (eg, 'true', 'on', 'false',
                      'off'). True to put the node in maintenance mode; False
                      to take the node out of maintenance mode.
        :param maint_reason: Optional string. Reason for putting node
                             into maintenance mode.
        :raises: InvalidAttribute if state is an invalid string (that doesn't
                 represent a Boolean).

        """
        if isinstance(state, bool):
            maintenance_mode = state
        else:
            try:
                maintenance_mode = strutils.bool_from_string(state, True)
            except ValueError as e:
                raise exc.InvalidAttribute(_("Argument 'state': %(err)s") %
                                           {'err': e})
        path = "%s/maintenance" % node_id
        if maintenance_mode:
            reason = {'reason': maint_reason}
            return self.update(path, reason, http_method='PUT')
        else:
            return self.delete(path)

    def set_power_state(self, node_id, state):
        path = "%s/states/power" % node_id
        target = {'target': _power_states.get(state, state)}
        return self.update(path, target, http_method='PUT')

    def validate(self, node_uuid):
        path = "%s/validate" % node_uuid
        return self.get(path)

    def set_provision_state(self, node_uuid, state, configdrive=None):
        path = "%s/states/provision" % node_uuid
        body = {'target': state}
        if configdrive:
            if os.path.isfile(configdrive):
                with open(configdrive, 'rb') as f:
                    configdrive = f.read()
            if os.path.isdir(configdrive):
                configdrive = utils.make_configdrive(configdrive)

            body['configdrive'] = configdrive
        return self.update(path, body, http_method='PUT')

    def states(self, node_uuid):
        path = "%s/states" % node_uuid
        return self.get(path)

    def get_console(self, node_uuid):
        path = "%s/states/console" % node_uuid
        info = self.get(path)
        if not info:
            return {}
        return info.to_dict()

    def set_console_mode(self, node_uuid, enabled):
        """Set the console mode for the node.

        :param node_uuid: The UUID of the node.
        :param enabled: Either a Boolean or a string representation of a
                        Boolean. True to enable the console; False to disable.

        """
        path = "%s/states/console" % node_uuid
        target = {'enabled': enabled}
        return self.update(path, target, http_method='PUT')

    def set_boot_device(self, node_uuid, boot_device, persistent=False):
        path = "%s/management/boot_device" % node_uuid
        target = {'boot_device': boot_device, 'persistent': persistent}
        return self.update(path, target, http_method='PUT')

    def get_boot_device(self, node_uuid):
        path = "%s/management/boot_device" % node_uuid
        return self.get(path).to_dict()

    def get_supported_boot_devices(self, node_uuid):
        path = "%s/management/boot_device/supported" % node_uuid
        return self.get(path).to_dict()

    def get_vendor_passthru_methods(self, node_ident):
        path = "%s/vendor_passthru/methods" % node_ident
        return self.get(path).to_dict()
