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#

# Copyright (C) 2010, 2011 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

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# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

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# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Node group related commands"""

# pylint: disable-msg=W0401,W0614

# W0401: Wildcard import ganeti.cli

# W0614: Unused import %s from wildcard import (since we need cli)

from ganeti.cli import *

from ganeti import constants

from ganeti import opcodes

from ganeti import utils

#: default list of fields for L{ListGroups}

_LIST_DEF_FIELDS = ["name", "node_cnt", "pinst_cnt", "alloc_policy", "ndparams"]

def AddGroup(opts, args):

  """Add a node group to the cluster.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: a list of length 1 with the name of the group to create

  @rtype: int

  @return: the desired exit code

  """

  (group_name,) = args

  op = opcodes.OpGroupAdd(group_name=group_name, ndparams=opts.ndparams,

                          alloc_policy=opts.alloc_policy)

  SubmitOpCode(op, opts=opts)

def AssignNodes(opts, args):

  """Assign nodes to a group.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: args[0]: group to assign nodes to; args[1:]: nodes to assign

  @rtype: int

  @return: the desired exit code

  """

  group_name = args[0]

  node_names = args[1:]

  op = opcodes.OpGroupAssignNodes(group_name=group_name, nodes=node_names,

                                  force=opts.force)

  SubmitOpCode(op, opts=opts)

def _FmtDict(data):

  """Format dict data into command-line format.

  @param data: The input dict to be formatted

  @return: The formatted dict

  """

  if not data:

    return "(empty)"

  return utils.CommaJoin(["%s=%s" % (key, value)

                          for key, value in data.items()])

def ListGroups(opts, args):

  """List node groups and their properties.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: groups to list, or empty for all

  @rtype: int

  @return: the desired exit code

  """

  desired_fields = ParseFields(opts.output, _LIST_DEF_FIELDS)

  fmtoverride = {

    "node_list": (",".join, False),

    "pinst_list": (",".join, False),

    "ndparams": (_FmtDict, False),

    }

  return GenericList(constants.QR_GROUP, desired_fields, args, None,

                     opts.separator, not opts.no_headers,

                     format_override=fmtoverride, verbose=opts.verbose)

def ListGroupFields(opts, args):

  """List node fields.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: fields to list, or empty for all

  @rtype: int

  @return: the desired exit code

  """

  return GenericListFields(constants.QR_GROUP, args, opts.separator,

                           not opts.no_headers)

def SetGroupParams(opts, args):

  """Modifies a node group's parameters.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should contain only one element, the node group name

  @rtype: int

  @return: the desired exit code

  """

  all_changes = {

    "ndparams": opts.ndparams,

    "alloc_policy": opts.alloc_policy,

  }

  if all_changes.values().count(None) == len(all_changes):

    ToStderr("Please give at least one of the parameters.")

    return 1

  op = opcodes.OpGroupSetParams(group_name=args[0], # pylint: disable-msg=W0142

                                **all_changes)

  result = SubmitOrSend(op, opts)

  if result:

    ToStdout("Modified node group %s", args[0])

    for param, data in result:

      ToStdout(" - %-5s -> %s", param, data)

  return 0

def RemoveGroup(opts, args):

  """Remove a node group from the cluster.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: a list of length 1 with the name of the group to remove

  @rtype: int

  @return: the desired exit code

  """

  (group_name,) = args

  op = opcodes.OpGroupRemove(group_name=group_name)

  SubmitOpCode(op, opts=opts)

def RenameGroup(opts, args):

  """Rename a node group.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: a list of length 2, [old_name, new_name]

  @rtype: int

  @return: the desired exit code

  """

  old_name, new_name = args

  op = opcodes.OpGroupRename(old_name=old_name, new_name=new_name)

  SubmitOpCode(op, opts=opts)

commands = {

  "add": (

    AddGroup, ARGS_ONE_GROUP, [DRY_RUN_OPT, ALLOC_POLICY_OPT, NODE_PARAMS_OPT],

    "<group_name>", "Add a new node group to the cluster"),

  "assign-nodes": (

    AssignNodes, ARGS_ONE_GROUP + ARGS_MANY_NODES, [DRY_RUN_OPT, FORCE_OPT],

    "<group_name> <node>...", "Assign nodes to a group"),

  "list": (

    ListGroups, ARGS_MANY_GROUPS,

    [NOHDR_OPT, SEP_OPT, FIELDS_OPT, VERBOSE_OPT],

    "[<group_name>...]",

    "Lists the node groups in the cluster. The available fields can be shown"

    " using the \"list-fields\" command (see the man page for details)."

    " The default list is (in order): %s." % utils.CommaJoin(_LIST_DEF_FIELDS)),

  "list-fields": (

    ListGroupFields, [ArgUnknown()], [NOHDR_OPT, SEP_OPT], "[fields...]",

    "Lists all available fields for node groups"),

  "modify": (

    SetGroupParams, ARGS_ONE_GROUP,

    [DRY_RUN_OPT, SUBMIT_OPT, ALLOC_POLICY_OPT, NODE_PARAMS_OPT],

    "<group_name>", "Alters the parameters of a node group"),

  "remove": (

    RemoveGroup, ARGS_ONE_GROUP, [DRY_RUN_OPT],

    "[--dry-run] <group_name>",

    "Remove an (empty) node group from the cluster"),

  "rename": (

    RenameGroup, [ArgGroup(min=2, max=2)], [DRY_RUN_OPT],

    "[--dry-run] <old_name> <new_name>", "Rename a node group"),

}

def Main():

  return GenericMain(commands)