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  # Copyright 2012 Nebula, Inc.
  #
  #    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 logging
  
  from django import shortcuts
  from django import template
  from django.core import urlresolvers
  from django.template.defaultfilters import title
  from django.utils.http import urlencode
  from django.utils.translation import string_concat, ugettext_lazy as _
  
  from horizon.conf import HORIZON_CONFIG
  from horizon import exceptions
  from horizon import messages
  from horizon import tables
  from horizon.templatetags import sizeformat
  from horizon.utils.filters import replace_underscores
  
  from openstack_dashboard import api
  from openstack_dashboard.dashboards.project.access_and_security \
          .floating_ips.workflows import IPAssociationWorkflow
  from .tabs import InstanceDetailTabs, LogTab, ConsoleTab
  
  
  LOG = logging.getLogger(__name__)
  
  ACTIVE_STATES = ("ACTIVE",)
  
  POWER_STATES = {
      0: "NO STATE",
      1: "RUNNING",
      2: "BLOCKED",
      3: "PAUSED",
      4: "SHUTDOWN",
      5: "SHUTOFF",
      6: "CRASHED",
      7: "SUSPENDED",
      8: "FAILED",
      9: "BUILDING",
  }
  
  PAUSE = 0
  UNPAUSE = 1
  SUSPEND = 0
  RESUME = 1
  
  
  def is_deleting(instance):
      task_state = getattr(instance, "OS-EXT-STS:task_state", None)
      if not task_state:
          return False
      return task_state.lower() == "deleting"
  
  
  class TerminateInstance(tables.BatchAction):
      name = "terminate"
      action_present = _("Terminate")
      action_past = _("Scheduled termination of")
      data_type_singular = _("Instance")
      data_type_plural = _("Instances")
      classes = ('btn-danger', 'btn-terminate')
  
      def allowed(self, request, instance=None):
          return True
  
      def action(self, request, obj_id):
          api.nova.server_delete(request, obj_id)
  
  
  class RebootInstance(tables.BatchAction):
      name = "reboot"
      action_present = _("Hard Reboot")
      action_past = _("Hard Rebooted")
      data_type_singular = _("Instance")
      data_type_plural = _("Instances")
      classes = ('btn-danger', 'btn-reboot')
  
      def allowed(self, request, instance=None):
          return ((instance.status in ACTIVE_STATES
                   or instance.status == 'SHUTOFF')
                  and not is_deleting(instance))
  
      def action(self, request, obj_id):
          api.nova.server_reboot(request, obj_id, api.nova.REBOOT_HARD)
  
  
  class SoftRebootInstance(RebootInstance):
      name = "soft_reboot"
      action_present = _("Soft Reboot")
      action_past = _("Soft Rebooted")
  
      def action(self, request, obj_id):
          api.nova.server_reboot(request, obj_id, api.nova.REBOOT_SOFT)
  
  
  class TogglePause(tables.BatchAction):
      name = "pause"
      action_present = (_("Pause"), _("Resume"))
      action_past = (_("Paused"), _("Resumed"))
      data_type_singular = _("Instance")
      data_type_plural = _("Instances")
      classes = ("btn-pause",)
  
      def allowed(self, request, instance=None):
          self.paused = False
          if not instance:
              return self.paused
          self.paused = instance.status == "PAUSED"
          if self.paused:
              self.current_present_action = UNPAUSE
          else:
              self.current_present_action = PAUSE
          return ((instance.status in ACTIVE_STATES or self.paused)
                  and not is_deleting(instance))
  
      def action(self, request, obj_id):
          if self.paused:
              api.nova.server_unpause(request, obj_id)
              self.current_past_action = UNPAUSE
          else:
              api.nova.server_pause(request, obj_id)
              self.current_past_action = PAUSE
  
  
  class ToggleSuspend(tables.BatchAction):
      name = "suspend"
      action_present = (_("Suspend"), _("Resume"))
      action_past = (_("Suspended"), _("Resumed"))
      data_type_singular = _("Instance")
      data_type_plural = _("Instances")
      classes = ("btn-suspend",)
  
      def allowed(self, request, instance=None):
          self.suspended = False
          if not instance:
              self.suspended
          self.suspended = instance.status == "SUSPENDED"
          if self.suspended:
              self.current_present_action = RESUME
          else:
              self.current_present_action = SUSPEND
          return ((instance.status in ACTIVE_STATES or self.suspended)
                  and not is_deleting(instance))
  
      def action(self, request, obj_id):
          if self.suspended:
              api.nova.server_resume(request, obj_id)
              self.current_past_action = RESUME
          else:
              api.nova.server_suspend(request, obj_id)
              self.current_past_action = SUSPEND
  
  
  class LaunchLink(tables.LinkAction):
      name = "launch"
      verbose_name = _("Launch Instance")
      url = "horizon:project:instances:launch"
      classes = ("btn-launch", "ajax-modal")
  
      def allowed(self, request, datum):
          try:
              limits = api.nova.tenant_absolute_limits(request, reserved=True)
  
              instances_available = limits['maxTotalInstances'] \
                  - limits['totalInstancesUsed']
              cores_available = limits['maxTotalCores'] \
                  - limits['totalCoresUsed']
              ram_available = limits['maxTotalRAMSize'] - limits['totalRAMUsed']
  
              if instances_available <= 0 or cores_available <= 0 \
                      or ram_available <= 0:
                  if "disabled" not in self.classes:
                      self.classes = [c for c in self.classes] + ['disabled']
                      self.verbose_name = string_concat(self.verbose_name, ' ',
                                                        _("(Quota exceeded)"))
              else:
                  self.verbose_name = _("Launch Instance")
                  classes = [c for c in self.classes if c != "disabled"]
                  self.classes = classes
          except:
              LOG.exception("Failed to retrieve quota information")
              # If we can't get the quota information, leave it to the
              # API to check when launching
  
          return True  # The action should always be displayed
  
  
  class EditInstance(tables.LinkAction):
      name = "edit"
      verbose_name = _("Edit Instance")
      url = "horizon:project:instances:update"
      classes = ("ajax-modal", "btn-edit")
  
      def get_link_url(self, project):
          return self._get_link_url(project, 'instance_info')
  
      def _get_link_url(self, project, step_slug):
          base_url = urlresolvers.reverse(self.url, args=[project.id])
          param = urlencode({"step": step_slug})
          return "?".join([base_url, param])
  
      def allowed(self, request, instance):
          return not is_deleting(instance)
  
  
  class EditInstanceSecurityGroups(EditInstance):
      name = "edit_secgroups"
      verbose_name = _("Edit Security Groups")
  
      def get_link_url(self, project):
          return self._get_link_url(project, 'update_security_groups')
  
      def allowed(self, request, instance=None):
          return (instance.status in ACTIVE_STATES and
                  not is_deleting(instance) and
                  request.user.tenant_id == instance.tenant_id)
  
  
  class CreateSnapshot(tables.LinkAction):
      name = "snapshot"
      verbose_name = _("Create Snapshot")
      url = "horizon:project:images_and_snapshots:snapshots:create"
      classes = ("ajax-modal", "btn-camera")
  
      def allowed(self, request, instance=None):
          return instance.status in ACTIVE_STATES and not is_deleting(instance)
  
  
  class ConsoleLink(tables.LinkAction):
      name = "console"
      verbose_name = _("Console")
      url = "horizon:project:instances:detail"
      classes = ("btn-console",)
  
      def allowed(self, request, instance=None):
          return instance.status in ACTIVE_STATES and not is_deleting(instance)
  
      def get_link_url(self, datum):
          base_url = super(ConsoleLink, self).get_link_url(datum)
          tab_query_string = ConsoleTab(InstanceDetailTabs).get_query_string()
          return "?".join([base_url, tab_query_string])
  
  
  class LogLink(tables.LinkAction):
      name = "log"
      verbose_name = _("View Log")
      url = "horizon:project:instances:detail"
      classes = ("btn-log",)
  
      def allowed(self, request, instance=None):
          return instance.status in ACTIVE_STATES and not is_deleting(instance)
  
      def get_link_url(self, datum):
          base_url = super(LogLink, self).get_link_url(datum)
          tab_query_string = LogTab(InstanceDetailTabs).get_query_string()
          return "?".join([base_url, tab_query_string])
  
  
  class ConfirmResize(tables.Action):
      name = "confirm"
      verbose_name = _("Confirm Resize/Migrate")
      classes = ("btn-confirm", "btn-action-required")
  
      def allowed(self, request, instance):
          return instance.status == 'VERIFY_RESIZE'
  
      def single(self, table, request, instance):
          api.nova.server_confirm_resize(request, instance)
  
  
  class RevertResize(tables.Action):
      name = "revert"
      verbose_name = _("Revert Resize/Migrate")
      classes = ("btn-revert", "btn-action-required")
  
      def allowed(self, request, instance):
          return instance.status == 'VERIFY_RESIZE'
  
      def single(self, table, request, instance):
          api.nova.server_revert_resize(request, instance)
  
  
  class AssociateIP(tables.LinkAction):
      name = "associate"
      verbose_name = _("Associate Floating IP")
      url = "horizon:project:access_and_security:floating_ips:associate"
      classes = ("ajax-modal", "btn-associate")
  
      def allowed(self, request, instance):
          fip = api.network.NetworkClient(request).floating_ips
          if fip.is_simple_associate_supported():
              return False
          return not is_deleting(instance)
  
      def get_link_url(self, datum):
          base_url = urlresolvers.reverse(self.url)
          next = urlresolvers.reverse("horizon:project:instances:index")
          params = {"instance_id": self.table.get_object_id(datum),
                    IPAssociationWorkflow.redirect_param_name: next}
          params = urlencode(params)
          return "?".join([base_url, params])
  
  
  class SimpleAssociateIP(tables.Action):
      name = "associate-simple"
      verbose_name = _("Associate Floating IP")
      classes = ("btn-associate-simple",)
  
      def allowed(self, request, instance):
          fip = api.network.NetworkClient(request).floating_ips
          if not fip.is_simple_associate_supported():
              return False
          return not is_deleting(instance)
  
      def single(self, table, request, instance):
          try:
              fip = api.network.tenant_floating_ip_allocate(request)
              api.network.floating_ip_associate(request, fip.id, instance)
              messages.success(request,
                               _("Successfully associated floating IP: %s")
                               % fip.ip)
          except:
              exceptions.handle(request,
                                _("Unable to associate floating IP."))
          return shortcuts.redirect("horizon:project:instances:index")
  
  
  class SimpleDisassociateIP(tables.Action):
      name = "disassociate"
      verbose_name = _("Disassociate Floating IP")
      classes = ("btn-danger", "btn-disassociate",)
  
      def allowed(self, request, instance):
          if not HORIZON_CONFIG["simple_ip_management"]:
              return False
          return not is_deleting(instance)
  
      def single(self, table, request, instance_id):
          try:
              fips = [fip for fip in api.network.tenant_floating_ip_list(request)
                      if fip.port_id == instance_id]
              # Removing multiple floating IPs at once doesn't work, so this pops
              # off the first one.
              if fips:
                  fip = fips.pop()
                  api.network.floating_ip_disassociate(request,
                                                       fip.id, instance_id)
                  api.network.tenant_floating_ip_release(request, fip.id)
                  messages.success(request,
                                   _("Successfully disassociated "
                                     "floating IP: %s") % fip.ip)
              else:
                  messages.info(request, _("No floating IPs to disassociate."))
          except:
              exceptions.handle(request,
                                _("Unable to disassociate floating IP."))
          return shortcuts.redirect("horizon:project:instances:index")
  
  
  class UpdateRow(tables.Row):
      ajax = True
  
      def get_data(self, request, instance_id):
          instance = api.nova.server_get(request, instance_id)
          instance.full_flavor = api.nova.flavor_get(request,
                                                     instance.flavor["id"])
          return instance
  
  
  def get_ips(instance):
      template_name = 'project/instances/_instance_ips.html'
      context = {"instance": instance}
      return template.loader.render_to_string(template_name, context)
  
  
  def get_size(instance):
      if hasattr(instance, "full_flavor"):
          size_string = _("%(name)s | %(RAM)s RAM | %(VCPU)s VCPU "
                          "| %(disk)s Disk")
          vals = {'name': instance.full_flavor.name,
                  'RAM': sizeformat.mbformat(instance.full_flavor.ram),
                  'VCPU': instance.full_flavor.vcpus,
                  'disk': sizeformat.diskgbformat(instance.full_flavor.disk)}
          return size_string % vals
      return _("Not available")
  
  
  def get_keyname(instance):
      if hasattr(instance, "key_name"):
          keyname = instance.key_name
          return keyname
      return _("Not available")
  
  
  def get_power_state(instance):
      return POWER_STATES.get(getattr(instance, "OS-EXT-STS:power_state", 0), '')
  
  
  STATUS_DISPLAY_CHOICES = (
      ("resize", "Resize/Migrate"),
      ("verify_resize", "Confirm or Revert Resize/Migrate"),
      ("revert_resize", "Revert Resize/Migrate"),
  )
  
  
  TASK_DISPLAY_CHOICES = (
      ("image_snapshot", "Snapshotting"),
      ("resize_prep", "Preparing Resize or Migrate"),
      ("resize_migrating", "Resizing or Migrating"),
      ("resize_migrated", "Resized or Migrated"),
      ("resize_finish", "Finishing Resize or Migrate"),
      ("resize_confirming", "Confirming Resize or Nigrate"),
      ("resize_reverting", "Reverting Resize or Migrate"),
      ("unpausing", "Resuming"),
  )
  
  
  class InstancesTable(tables.DataTable):
      TASK_STATUS_CHOICES = (
          (None, True),
          ("none", True)
      )
      STATUS_CHOICES = (
          ("active", True),
          ("shutoff", True),
          ("suspended", True),
          ("paused", True),
          ("error", False),
      )
      name = tables.Column("name",
                           link=("horizon:project:instances:detail"),
                           verbose_name=_("Instance Name"))
      ip = tables.Column(get_ips, verbose_name=_("IP Address"))
      size = tables.Column(get_size,
                           verbose_name=_("Size"),
                           attrs={'data-type': 'size'})
      keypair = tables.Column(get_keyname, verbose_name=_("Keypair"))
      status = tables.Column("status",
                             filters=(title, replace_underscores),
                             verbose_name=_("Status"),
                             status=True,
                             status_choices=STATUS_CHOICES,
                             display_choices=STATUS_DISPLAY_CHOICES)
      task = tables.Column("OS-EXT-STS:task_state",
                           verbose_name=_("Task"),
                           filters=(title, replace_underscores),
                           status=True,
                           status_choices=TASK_STATUS_CHOICES,
                           display_choices=TASK_DISPLAY_CHOICES)
      state = tables.Column(get_power_state,
                            filters=(title, replace_underscores),
                            verbose_name=_("Power State"))
  
      class Meta:
          name = "instances"
          verbose_name = _("Instances")
          status_columns = ["status", "task"]
          row_class = UpdateRow
          table_actions = (LaunchLink, TerminateInstance)
          row_actions = (ConfirmResize, RevertResize, CreateSnapshot,
                         SimpleAssociateIP, AssociateIP,
                         SimpleDisassociateIP, EditInstance,
                         EditInstanceSecurityGroups, ConsoleLink, LogLink,
                         TogglePause, ToggleSuspend, SoftRebootInstance,
                         RebootInstance, TerminateInstance)
  