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Alice Heaton
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from django.contrib import messages
from django.http import HttpResponseRedirect
from django.utils.translation import ugettext as _
from django.views.generic.edit import FormView

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Martin Burchell
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from ..forms.item import AddEditItemForm
from ..constants import ITEM_TYPE_CATEGORY

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class AddEditItemView(FormView):
template_name = "hid/add_edit_item.html"
form_class = AddEditItemForm
def _initialize_item(self, item_id):
""" Initialize the view's item from the given item id.
This has a side effect of initializing:
self.item to the item object (or None)
self.item_type to the item type, if defined (None otherwise)
self.item_terms to a dictionary of taxonomy to list of terms
Args:
item_id (int): Item id
"""
self.item = None
self.item_type = None
self.item_terms = None
if not item_id:
return
self.item = transport.items.get(item_id)

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self.item_terms = {}
for term in self.item['terms']:
taxonomy = term['taxonomy']
if taxonomy == 'item-types':
self.item_type = term
if taxonomy not in self.item_terms:
self.item_terms[taxonomy] = []
self.item_terms[taxonomy].append(term)
def get(self, request, *args, **kwargs):
""" get request handler
If the URL defines an item_id, we load the corresponding item
to make it available for forms.
"""
try:
self._initialize_item(kwargs.get('item_id'))
except transport.exceptions.TransportException:
return self._response(
self.request.GET.get('next', '/'),
messages.ERROR,
(_('Item with id %s could not be found') %
str(kwargs.get('item_id')))
)

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return super(AddEditItemView, self).get(request, *args, **kwargs)
def post(self, request, *args, **kwargs):
""" post request handler
If the URL defines an item_id, we load the corresponding item
to make it available for forms.

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valid for those.
"""
try:
self._initialize_item(kwargs.get('item_id'))
except transport.exceptions.TransportException:
return self._response(
self.request.GET.get('next', '/'),
messages.ERROR,
(_('Item with id %s could not be found') %
str(kwargs.get('item_id')))
)

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if 'cancel' in self.request.POST['action']:
return self._response(
self.request.POST['next'],
messages.INFO,
_('No action performed')
)
if 'delete' in self.request.POST['action']:

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return super(AddEditItemView, self).post(request, *args, **kwargs)
def get_initial(self):
""" Return the form object's initial values for the current item """
if self.item is None:
return {
'id': 0
}
initial = {
'id': self.item['id'],
'body': self.item['body'],
'timestamp': self.item['timestamp'],
'next': self.request.GET.get('next', self.request.path)
}
item_type = getattr(self, 'item_type', None)
if item_type is not None:
taxonomy = ITEM_TYPE_CATEGORY.get(item_type['name'])
if (taxonomy and taxonomy in self.item_terms and len(self.item_terms[taxonomy]) > 0):
initial['category'] = self.item_terms[taxonomy][0]['name']

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return initial
def get_form(self, form_class):
""" Return the form object to be used """
if self.item_type:
item_type = self.item_type['name']
else:
# TODO: When implementing ADD mode, we'll need to use the URL to
# get the default
item_type = None
return form_class(item_type, **self.get_form_kwargs())

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def get_context_data(self, **kwargs):

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""" Get the form's context data
We invoke FormView's get_context_data and add the current
item.
"""
context = super(AddEditItemView, self).get_context_data(**kwargs)
# Add item to the context
context['item'] = self.item
# Add the type label to the context
# TODO: When implementing ADD mode, we'll need to use the URL to
# get the default.
context['item_type_label'] = '?'
if self.item_type:
context['item_type_label'] = self.item_type['long_name']
# Add the width of the option row to the context
option_row_widget_count = 1 # We always have 'created'
if 'category' in kwargs['form'].fields:
option_row_widget_count += 1
if 'region' in kwargs['form'].fields:
option_row_widget_count += 1
context['option_row_width'] = 12 / option_row_widget_count
return context
def form_valid(self, form):
""" Form submit handler """
id = int(form.cleaned_data['id'])
item_description = self._get_item_description()
taxonomy = ITEM_TYPE_CATEGORY.get(self.item_type['name'])
# TODO: Combine terms into single transaction
category = form.cleaned_data.pop('category', None)
try:
transport.items.update(id, form.cleaned_data)
if taxonomy:
if category:
transport.items.add_term(id, taxonomy, category)
else:
transport.items.delete_all_terms(id, taxonomy)
message = _("%s %d successfully updated.") % (
item_description,
id,
)
message_code = messages.SUCCESS
except transport.exceptions.TransportException as e:
message = e.message.get('detail')
if message is None:
message = e.message
message_code = messages.ERROR

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return self._response(
form.cleaned_data['next'],

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def form_invalid(self, form):
""" Form invalid handler """
messages.add_message(
self.request,
messages.ERROR,
_("The form could not be submitted."
"Please correct the errors and submit it again.")
)
return super(AddEditItemView, self).form_invalid(form)

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def _response(self, url, message_type, message):
""" Log a message and return an HTTP Response
Args:
url (str): URL to redirect to
message_type (str): Message type to log (from message.INFO, etc.)
message (str): Message to log
Returns:
HttpResponseRedirect: Response object
"""
messages.add_message(self.request, message_type, message)
return HttpResponseRedirect(url)
def _delete_item(self):
id = self.item['id']
transport.items.delete(id)
item_description = self._get_item_description()
return self._response(
self.request.POST['next'],
messages.SUCCESS,
_("%s %d successfully deleted.") % (
item_description,
id,
)
)
def _get_item_description(self):
if self.item_type:
return self.item_type['long_name']
return _('Item')