"""
Views for managing Nova volumes.
"""

import logging

from django import shortcuts
from django.contrib import messages
from django.utils.translation import ugettext as _

from horizon import api
from horizon import forms
from novaclient import exceptions as novaclient_exceptions


LOG = logging.getLogger(__name__)


class CreateForm(forms.SelfHandlingForm):
    name = forms.CharField(max_length="255", label="Volume Name")
    description = forms.CharField(widget=forms.Textarea,
            label=_("Description"), required=False)
    size = forms.IntegerField(min_value=1, label="Size (GB)")

    def handle(self, request, data):
        try:
            api.volume_create(request, data['size'], data['name'],
                              data['description'])
            message = 'Creating volume "%s"' % data['name']
            LOG.info(message)
            messages.info(request, message)
        except novaclient_exceptions.ClientException, e:
            LOG.exception("ClientException in CreateVolume")
            messages.error(request,
                           _('Error Creating Volume: %s') % e.message)
        return shortcuts.redirect("horizon:nova:volumes:index")


class DeleteForm(forms.SelfHandlingForm):
    volume_id = forms.CharField(widget=forms.HiddenInput())
    volume_name = forms.CharField(widget=forms.HiddenInput())

    def handle(self, request, data):
        try:
            api.volume_delete(request, data['volume_id'])
            message = 'Deleting volume "%s"' % data['volume_id']
            LOG.info(message)
            messages.info(request, message)
        except novaclient_exceptions.ClientException, e:
            LOG.exception("ClientException in DeleteVolume")
            messages.error(request,
                           _('Error deleting volume: %s') % e.message)
        return shortcuts.redirect(request.build_absolute_uri())


class AttachForm(forms.SelfHandlingForm):
    volume_id = forms.CharField(widget=forms.HiddenInput())
    device = forms.CharField(label="Device Name", initial="/dev/vdb")

    def __init__(self, *args, **kwargs):
        super(AttachForm, self).__init__(*args, **kwargs)
        instance_list = kwargs.get('initial', {}).get('instance_list', [])
        self.fields['instance'] = forms.ChoiceField(
                choices=instance_list,
                label="Attach to Instance",
                help_text="Select an instance to attach to.")

    def handle(self, request, data):
        try:
            api.volume_attach(request, data['volume_id'], data['instance'],
                              data['device'])
            message = (_('Attaching volume %s to instance %s at %s') %
                            (data['volume_id'], data['instance'],
                             data['device']))
            LOG.info(message)
            messages.info(request, message)
        except novaclient_exceptions.ClientException, e:
            LOG.exception("ClientException in AttachVolume")
            messages.error(request,
                           _('Error attaching volume: %s') % e.message)
        return shortcuts.redirect("horizon:nova:volumes:index")


class DetachForm(forms.SelfHandlingForm):
    volume_id = forms.CharField(widget=forms.HiddenInput())
    instance_id = forms.CharField(widget=forms.HiddenInput())
    attachment_id = forms.CharField(widget=forms.HiddenInput())

    def handle(self, request, data):
        try:
            api.volume_detach(request, data['instance_id'],
                              data['attachment_id'])
            message = (_('Detaching volume %s from instance %s') %
                    (data['volume_id'], data['instance_id']))
            LOG.info(message)
            messages.info(request, message)
        except novaclient_exceptions.ClientException, e:
            LOG.exception("ClientException in DetachVolume")
            messages.error(request,
                           _('Error detaching volume: %s') % e.message)
        return shortcuts.redirect("horizon:nova:volumes:index")
