# vim: tabstop=4 shiftwidth=4 softtabstop=4

# 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


LOG = logging.getLogger(__name__)

ACTIVE_STATES = ("ACTIVE",)

POWER_STATES = {
    0: "NO STATE",
    1: "RUNNING",
    2: "SHUTDOWN",
    3: "FAILED",
    4: "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 RebootService(tables.BatchAction):
    name = "reboot"
    action_present = _("Reboot")
    action_past = _("Rebooted")
    data_type_singular = _("Service")
    data_type_plural = _("Services")
    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)


class CreateService(tables.LinkAction):
    name = "CreateService"
    verbose_name = _("Create Windows Service")
    url = "horizon:project:windc:create"
    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 = _("Create Windows Service")
                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 DeleteService(tables.BatchAction):
    name = "DeleteService"
    action_present = _("DeleteService")
    action_past = _("Scheduled termination of")
    data_type_singular = _("Service")
    data_type_plural = _("Services")
    classes = ('btn-danger', 'btn-terminate')

    def allowed(self, request, instance=None):
        if instance:
            # FIXME(gabriel): This is true in Essex, but in FOLSOM an instance
            # can be terminated in any state. We should improve this error
            # handling when LP bug 1037241 is implemented.
            return instance.status not in ("PAUSED", "SUSPENDED")
        return True

    def action(self, request, obj_id):
        api.nova.server_delete(request, obj_id)


class EditService(tables.LinkAction):
    name = "edit"
    verbose_name = _("Edit Service")
    url = "horizon:project:windc:update"
    classes = ("ajax-modal", "btn-edit")

    def allowed(self, request, instance):
        return not is_deleting(instance)

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/windc/_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_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 WinServicesTable(tables.DataTable):
    TASK_STATUS_CHOICES = (
        (None, True),
        ("none", True)
    )
    STATUS_CHOICES = (
        ("active", True),
        ("shutoff", True),
        ("error", False),
    )
    name = tables.Column("name",
                         link=("horizon:project:windc:detail"),
                         verbose_name=_("Name"))
    ip = tables.Column(get_ips, verbose_name=_("IP Address"))
    size = tables.Column(get_size,
                         verbose_name=_("Type"),
                         attrs={'data-type': 'type'})
    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)

    class Meta:
        name = "windc"
        verbose_name = _("Windows Services")
        status_columns = ["status", "task"]
        row_class = UpdateRow
        table_actions = (CreateService, DeleteService)
        row_actions = (EditService, RebootService)