# Copyright (c) 2012-2013 Sebastian Reichel <sre@ring0.de>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
# OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.

from django.utils.translation import ugettext_lazy as _
from django.contrib.admin import SimpleListFilter
import models

class HasParent(SimpleListFilter):
	# Human-readable title which will be displayed in the
	# right admin sidebar just above the filter options.
	title = _('has parent')

	# Parameter for the filter that will be used in the URL query.
	parameter_name = 'has_parent'

	def lookups(self, request, model_admin):
		"""
		Returns a list of tuples. The first element in each
		tuple is the coded value for the option that will
		appear in the URL query. The second element is the
		human-readable name for the option that will appear
		in the right sidebar.
		"""
		return (
			('yes', _('Yes')),
			('no',  _('No')),
		)

	def queryset(self, request, queryset):
		"""
		Returns the filtered queryset based on the value
		provided in the query string and retrievable via
		`self.value()`.
		"""
		# Compare the requested value (either 'None' or 'other')
		# to decide how to filter the queryset.
		if self.value() == 'yes':
			return queryset.filter(parent__isnull = False)
		if self.value() == 'no':
			return queryset.filter(parent__isnull = True)

class HasBarcode(SimpleListFilter):
	# Human-readable title which will be displayed in the
	# right admin sidebar just above the filter options.
	title = _('has barcode')

	# Parameter for the filter that will be used in the URL query.
	parameter_name = 'has_barcode'

	def lookups(self, request, model_admin):
		"""
		Returns a list of tuples. The first element in each
		tuple is the coded value for the option that will
		appear in the URL query. The second element is the
		human-readable name for the option that will appear
		in the right sidebar.
		"""
		return (
			('yes', _('Yes')),
			('no',  _('No')),
		)

	def queryset(self, request, queryset):
		"""
		Returns the filtered queryset based on the value
		provided in the query string and retrievable via
		`self.value()`.
		"""
		# Compare the requested value (either 'None' or 'other')
		# to decide how to filter the queryset.
		if self.value() == 'yes':
			return queryset.filter(barcode__isnull = False)
		if self.value() == 'no':
			return queryset.filter(barcode__isnull = True)

class HasIcon(SimpleListFilter):
	# Human-readable title which will be displayed in the
	# right admin sidebar just above the filter options.
	title = _('has icon')

	# Parameter for the filter that will be used in the URL query.
	parameter_name = 'has_icon'

	def lookups(self, request, model_admin):
		"""
		Returns a list of tuples. The first element in each
		tuple is the coded value for the option that will
		appear in the URL query. The second element is the
		human-readable name for the option that will appear
		in the right sidebar.
		"""
		return (
			('yes', _('Yes')),
			('no',  _('No')),
		)

	def queryset(self, request, queryset):
		"""
		Returns the filtered queryset based on the value
		provided in the query string and retrievable via
		`self.value()`.
		"""
		# Compare the requested value (either 'None' or 'other')
		# to decide how to filter the queryset.
		if self.value() == 'yes':
			return queryset.filter(icon__isnull = False)
		if self.value() == 'no':
			return queryset.filter(icon__isnull = True)