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"""Logical units for querying instances."""

import itertools

from ganeti import constants
from ganeti import locking
from ganeti import utils
from ganeti.cmdlib.base import NoHooksLU
from ganeti.cmdlib.common import ShareAll, GetWantedInstances, \
  CheckInstancesNodeGroups, AnnotateDiskParams
from ganeti.cmdlib.instance_utils import NICListToTuple
from ganeti.hypervisor import hv_base


class LUInstanceQueryData(NoHooksLU):
  """Query runtime instance data.

  """
  REQ_BGL = False

  def ExpandNames(self):
    self.needed_locks = {}

    # Use locking if requested or when non-static information is wanted
    if not (self.op.static or self.op.use_locking):
      self.LogWarning("Non-static data requested, locks need to be acquired")
      self.op.use_locking = True

    if self.op.instances or not self.op.use_locking:
      # Expand instance names right here
      (_, self.wanted_names) = GetWantedInstances(self, self.op.instances)
    else:
      # Will use acquired locks
      self.wanted_names = None

    if self.op.use_locking:
      self.share_locks = ShareAll()

      if self.wanted_names is None:
        self.needed_locks[locking.LEVEL_INSTANCE] = locking.ALL_SET
      else:
        self.needed_locks[locking.LEVEL_INSTANCE] = self.wanted_names

      self.needed_locks[locking.LEVEL_NODEGROUP] = []
      self.needed_locks[locking.LEVEL_NODE] = []
      self.needed_locks[locking.LEVEL_NETWORK] = []
      self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
      self.dont_collate_locks[locking.LEVEL_NODEGROUP] = True
      self.dont_collate_locks[locking.LEVEL_NODE] = True
      self.dont_collate_locks[locking.LEVEL_NETWORK] = True

  def DeclareLocks(self, level):
    if self.op.use_locking:
      owned_instances = dict(self.cfg.GetMultiInstanceInfoByName(
                               self.owned_locks(locking.LEVEL_INSTANCE)))
      if level == locking.LEVEL_NODEGROUP:

        # Lock all groups used by instances optimistically; this requires going
        # via the node before it's locked, requiring verification later on
        self.needed_locks[locking.LEVEL_NODEGROUP] = \
          frozenset(group_uuid
                    for instance_uuid in owned_instances.keys()
                    for group_uuid in
                    self.cfg.GetInstanceNodeGroups(instance_uuid))

      elif level == locking.LEVEL_NODE:
        self._LockInstancesNodes()

      elif level == locking.LEVEL_NETWORK:
        self.needed_locks[locking.LEVEL_NETWORK] = \
          frozenset(net_uuid
                    for instance_uuid in owned_instances.keys()
                    for net_uuid in
                    self.cfg.GetInstanceNetworks(instance_uuid))

  def CheckPrereq(self):
    """Check prerequisites.

    This only checks the optional instance list against the existing names.

    """
    owned_instances = frozenset(self.owned_locks(locking.LEVEL_INSTANCE))
    owned_groups = frozenset(self.owned_locks(locking.LEVEL_NODEGROUP))
    owned_node_uuids = frozenset(self.owned_locks(locking.LEVEL_NODE))
    owned_networks = frozenset(self.owned_locks(locking.LEVEL_NETWORK))

    if self.wanted_names is None:
      assert self.op.use_locking, "Locking was not used"
      self.wanted_names = owned_instances

    instances = dict(self.cfg.GetMultiInstanceInfoByName(self.wanted_names))

    if self.op.use_locking:
      CheckInstancesNodeGroups(self.cfg, instances, owned_groups,
                               owned_node_uuids, None)
    else:
      assert not (owned_instances or owned_groups or
                  owned_node_uuids or owned_networks)

    self.wanted_instances = instances.values()

  def _ComputeBlockdevStatus(self, node_uuid, instance, dev):
    """Returns the status of a block device

    """
    if self.op.static or not node_uuid:
      return None

    result = self.rpc.call_blockdev_find(node_uuid, (dev, instance))
    if result.offline:
      return None

    result.Raise("Can't compute disk status for %s" % instance.name)

    status = result.payload
    if status is None:
      return None

    return (status.dev_path, status.major, status.minor,
            status.sync_percent, status.estimated_time,
            status.is_degraded, status.ldisk_status)

  def _ComputeDiskStatus(self, instance, node_uuid2name_fn, dev):
    """Compute block device status.

    """
    (anno_dev,) = AnnotateDiskParams(instance, [dev], self.cfg)

    return self._ComputeDiskStatusInner(instance, None, node_uuid2name_fn,
                                        anno_dev)

  def _ComputeDiskStatusInner(self, instance, snode_uuid, node_uuid2name_fn,
                              dev):
    """Compute block device status.

    @attention: The device has to be annotated already.

    """
    drbd_info = None
    output_logical_id = dev.logical_id
    if dev.dev_type in constants.DTS_DRBD:
      # we change the snode then (otherwise we use the one passed in)
      if dev.logical_id[0] == instance.primary_node:
        snode_uuid = dev.logical_id[1]
        snode_minor = dev.logical_id[4]
        pnode_minor = dev.logical_id[3]
      else:
        snode_uuid = dev.logical_id[0]
        snode_minor = dev.logical_id[3]
        pnode_minor = dev.logical_id[4]
      drbd_info = {
        "primary_node": node_uuid2name_fn(instance.primary_node),
        "primary_minor": pnode_minor,
        "secondary_node": node_uuid2name_fn(snode_uuid),
        "secondary_minor": snode_minor,
        "port": dev.logical_id[2],
      }
      # replace the secret present at the end of the ids with None
      output_logical_id = dev.logical_id[:-1] + (None,)

    dev_pstatus = self._ComputeBlockdevStatus(instance.primary_node,
                                              instance, dev)
    dev_sstatus = self._ComputeBlockdevStatus(snode_uuid, instance, dev)

    if dev.children:
      dev_children = [
        self._ComputeDiskStatusInner(instance, snode_uuid, node_uuid2name_fn, d)
        for d in dev.children
      ]
    else:
      dev_children = []

    return {
      "iv_name": dev.iv_name,
      "dev_type": dev.dev_type,
      "logical_id": output_logical_id,
      "drbd_info": drbd_info,
      "pstatus": dev_pstatus,
      "sstatus": dev_sstatus,
      "children": dev_children,
      "mode": dev.mode,
      "size": dev.size,
      "spindles": dev.spindles,
      "name": dev.name,
      "uuid": dev.uuid,
      }

  def Exec(self, feedback_fn):
    """Gather and return data"""
    result = {}

    cluster = self.cfg.GetClusterInfo()

    node_uuids = itertools.chain(*(self.cfg.GetInstanceNodes(i.uuid)
                                   for i in self.wanted_instances))
    nodes = dict(self.cfg.GetMultiNodeInfo(node_uuids))

    groups = dict(self.cfg.GetMultiNodeGroupInfo(node.group
                                                 for node in nodes.values()))

    for instance in self.wanted_instances:
      pnode = nodes[instance.primary_node]
      hvparams = cluster.FillHV(instance, skip_globals=True)

      if self.op.static or pnode.offline:
        remote_state = None
        if pnode.offline:
          self.LogWarning("Primary node %s is marked offline, returning static"
                          " information only for instance %s" %
                          (pnode.name, instance.name))
      else:
        remote_info = self.rpc.call_instance_info(
            instance.primary_node, instance.name, instance.hypervisor,
            cluster.hvparams[instance.hypervisor])
        remote_info.Raise("Error checking node %s" % pnode.name)
        remote_info = remote_info.payload

        allow_userdown = \
            cluster.enabled_user_shutdown and \
            (instance.hypervisor != constants.HT_KVM or
             hvparams[constants.HV_KVM_USER_SHUTDOWN])

        if remote_info and "state" in remote_info:
          if hv_base.HvInstanceState.IsShutdown(remote_info["state"]):
            if allow_userdown:
              remote_state = "user down"
            else:
              remote_state = "down"
          else:
            remote_state = "up"
        else:
          if instance.admin_state == constants.ADMINST_UP:
            remote_state = "down"
          elif instance.admin_state == constants.ADMINST_DOWN:
            if instance.admin_state_source == constants.USER_SOURCE:
              remote_state = "user down"
            else:
              remote_state = "down"
          else:
            remote_state = "offline"

      group2name_fn = lambda uuid: groups[uuid].name
      node_uuid2name_fn = lambda uuid: nodes[uuid].name

      disk_objects = self.cfg.GetInstanceDisks(instance.uuid)
      output_disks = [self._ComputeDiskStatus(instance, node_uuid2name_fn, d)
                      for d in disk_objects]

      secondary_nodes = self.cfg.GetInstanceSecondaryNodes(instance.uuid)
      snodes_group_uuids = [nodes[snode_uuid].group
                            for snode_uuid in secondary_nodes]

      result[instance.name] = {
        "name": instance.name,
        "config_state": instance.admin_state,
        "run_state": remote_state,
        "pnode": pnode.name,
        "pnode_group_uuid": pnode.group,
        "pnode_group_name": group2name_fn(pnode.group),
        "snodes": map(node_uuid2name_fn, secondary_nodes),
        "snodes_group_uuids": snodes_group_uuids,
        "snodes_group_names": map(group2name_fn, snodes_group_uuids),
        "os": instance.os,
        # this happens to be the same format used for hooks
        "nics": NICListToTuple(self, instance.nics),
        "disk_template": utils.GetDiskTemplate(disk_objects),
        "disks": output_disks,
        "hypervisor": instance.hypervisor,
        "network_port": instance.network_port,
        "hv_instance": instance.hvparams,
        "hv_actual": hvparams,
        "be_instance": instance.beparams,
        "be_actual": cluster.FillBE(instance),
        "os_instance": instance.osparams,
        "os_actual": cluster.SimpleFillOS(instance.os, instance.osparams),
        "serial_no": instance.serial_no,
        "mtime": instance.mtime,
        "ctime": instance.ctime,
        "uuid": instance.uuid,
        }

    return result