#!/usr/bin/python
#

# Copyright (C) 2006, 2007 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
# (at your option) any later version.
#
# 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.
#
# 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.


import sys
from optparse import make_option

from ganeti.cli import *
from ganeti import opcodes
from ganeti import logger
from ganeti import objects
from ganeti import utils
from ganeti import errors


def _DiagnoseOSValid(obj):
  """Verify whether an OS diagnose object represents a valid OS

    Args:
      obj: an diagnostic object as returned by OpDiagnoseOS

    Returns:
      bool: OS validity status

  """
  if isinstance(obj, objects.OS):
    return True
  elif isinstance(obj, errors.InvalidOS):
    return False
  else:
    raise errors.ProgrammerError("unknown OS diagnose type: '%s'" % type(obj))


def _DiagnoseOSName(obj):
  """Generate a status message for an OS diagnose object.

    Args:
      obj: an diagnostic object as returned by OpDiagnoseOS

    Returns:
      string: the name of the OS in question

  """
  if _DiagnoseOSValid(obj):
    return obj.name
  else:
    return obj.args[0]


def _DiagnoseOSStatus(obj):
  """Generate a status message for an OS diagnose object.

    Args:
      obj: an diagnostic object as returned by OpDiagnoseOS

    Returns:
      string: a description of the OS status

  """
  if _DiagnoseOSValid(obj):
    return "valid"
  else:
    return obj.args[2]


def _DiagnoseOSPath(obj):
  """Get the path out of an OS diagnose object.

    Args:
      obj: an diagnostic object as returned by OpDiagnoseOS

    Returns:
      string: the OS path

  """
  if _DiagnoseOSValid(obj):
    return obj.path
  else:
    return obj.args[1]


def _DiagnoseByOS(rlist):
  """Remap an OpDiagnoseOS() return list into an a per-os per-node dictionary

    Args:
      rlist: a map with nodes as keys and diagnoseobjects as values

    Returns:
      map: a map with osnames as keys and as value another map, with nodes as
           keys and diagnoseobjects as values
           e.g. {"debian-etch": {"node1": <object>, "node2": <object>}}

  """
  all_os = {}
  for node_name, nr in rlist.iteritems():
    if not nr:
      continue
    for obj in nr:
      os_name = _DiagnoseOSName(obj)
      if os_name not in all_os:
        all_os[os_name] = {}
      if node_name not in all_os[os_name]:
        all_os[os_name][node_name] = []
      all_os[os_name][node_name].append(obj)

  return all_os


def ListOS(opts, args):
  """List the OSes existing on this node.

  """
  op = opcodes.OpDiagnoseOS()
  result = SubmitOpCode(op)

  if not result:
    logger.ToStdout("Can't get the OS list")
    return 1

  node_data = result
  num_nodes = len(node_data)
  all_os = _DiagnoseByOS(node_data)

  valid_os = []
  for os_name, os_node_data in all_os.iteritems():
    if len(os_node_data) != num_nodes:
      continue

    if utils.all(os_node_data.values(), lambda l: _DiagnoseOSValid(l[0])):
      valid_os.append(os_name)

  if not opts.no_headers:
    headers = {"name": "Name"}
  else:
    headers = None

  data = GenerateTable(separator=None, headers=headers, fields=["name"],
                       data=[[os] for os in valid_os])

  for line in data:
    logger.ToStdout(line)

  return 0


def DiagnoseOS(opts, args):
  """Analyse all OSes on this cluster.

  """
  op = opcodes.OpDiagnoseOS()
  result = SubmitOpCode(op)

  if not result:
    logger.ToStdout("Can't get the OS list")
    return 1

  node_data = result
  all_os = _DiagnoseByOS(node_data)

  has_bad = False

  for os_name in all_os:
    nodes_valid = {}
    nodes_bad = {}
    for node_name in node_data:
      if node_name in all_os[os_name]:
        first_os = all_os[os_name][node_name].pop(0)
        first_os_msg = ("%s (path: %s)" %
                        (_DiagnoseOSStatus(first_os),
                         _DiagnoseOSPath(first_os)))
        if _DiagnoseOSValid(first_os):
          nodes_valid[node_name] = first_os_msg
        else:
          nodes_bad[node_name] = first_os_msg
      else:
        nodes_bad[node_name] = "OS not found"

    if nodes_valid and not nodes_bad:
      status = "valid"
    elif not nodes_valid and nodes_bad:
      status = "invalid"
      has_bad = True
    else:
      status = "partial valid"
      has_bad = True

    def _OutputNodeHiddenOSStatus(dobj_list):
      for dobj in dobj_list:
        logger.ToStdout("    [hidden] path: %s, status: %s" %
                        (_DiagnoseOSPath(dobj), _DiagnoseOSStatus(dobj)))

    def _OutputPerNodeOSStatus(msg_map):
      map_k = utils.NiceSort(msg_map.keys())
      for node_name in map_k:
        logger.ToStdout("  Node: %s, status: %s" %
                        (node_name, msg_map[node_name]))
        if node_name in all_os[os_name]:
          _OutputNodeHiddenOSStatus(all_os[os_name][node_name])

    logger.ToStdout("OS: %s [global status: %s]" % (os_name, status))
    _OutputPerNodeOSStatus(nodes_valid)
    _OutputPerNodeOSStatus(nodes_bad)
    logger.ToStdout("")

  return int(has_bad)


commands = {
  'list': (ListOS, ARGS_NONE, [DEBUG_OPT, NOHDR_OPT], "",
           "Lists all valid OSes on the master"),
  'diagnose': (DiagnoseOS, ARGS_NONE, [DEBUG_OPT], "",
               "Diagnose all OSes"),
  }

if __name__ == '__main__':
  sys.exit(GenericMain(commands))