admin.py
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	from django.contrib import admin
	from django import forms

	from datetime import date
	import re

	from import_export.admin import ImportExportModelAdmin
	from django.contrib.admin import TabularInline
	from django.contrib.admin import SimpleListFilter
	from django.contrib.admin import RelatedOnlyFieldListFilter

	from django.utils.translation import gettext_lazy as _

	#from inline_actions.admin import InlineActionsMixin
	#from inline_actions.admin import InlineActionsModelAdminMixin

	from django.shortcuts import render
	from django.http import HttpResponseRedirect

	from django.urls import reverse
	from django.utils.html import escape, mark_safe, format_html

	from .models import Country
	from .models import Language
	from .models import Issn
	from .models import Oa
	from .models import Publisher
	from .models import Journal
	from .models import Organization
	from .models import Version
	from .models import Licence
	from .models import Cost_factor_type
	from .models import Cost_factor
	from .models import Term
	from .models import ConditionType
	from .models import ConditionSet
	from .models import OrganizationCondition
	from .models import JournalCondition


	# Register your models here.

	@admin.register(Issn)
	class IssnAdmin(ImportExportModelAdmin):
	list_filter = ('issn_type', 'journal__publisher__name', )
	list_display = ("id", "issn", 'journal')


	class IssnInline(admin.TabularInline):
	model = Issn
	readonly_fields = ('issn', 'issn_type',)
	# This Inline is stricty read-only for the moment
	def has_change_permission(self, request, obj=None):
	return False

	def has_add_permission(self, request, obj=None):
	return False

	def has_delete_permission(self, request, obj=None):
	return False


	@admin.register(Journal)
	class JournalAdmin(ImportExportModelAdmin):
	list_display = ("id", "name", "get_journal_issns",)
	list_filter = ('publisher__name', 'oa_status')
	filter_horizontal = ('publisher', 'language', )
	inlines = (IssnInline, )

	def get_journal_issns(self, obj):
	return list(Issn.objects.filter(journal=obj))
	get_journal_issns.short_description = 'ISSNs'


	@admin.register(Language)
	class LanguageAdmin(ImportExportModelAdmin):
	pass


	@admin.register(Organization)
	class OrganizationAdmin(ImportExportModelAdmin):
	list_display = ("id", "name")
	list_filter = ('is_funder',)
	filter_horizontal = ('country', )


	@admin.register(Version)
	class VersionAdmin(ImportExportModelAdmin):
	pass


	@admin.register(Country)
	class CountryAdmin(ImportExportModelAdmin):
	pass


	@admin.register(Oa)
	class OaAdmin(ImportExportModelAdmin):
	pass


	@admin.register(Publisher)
	class PublisherAdmin(ImportExportModelAdmin):
	list_display = ("id", "name")
	# Experimental: what will happen with 200+ countries in the database?
	list_filter = ('country__name', )
	filter_horizontal = ('country', )


	@admin.register(Term)
	class TermAdmin(ImportExportModelAdmin):
	list_filter = ('version', 'licence')
	filter_horizontal = ('version', 'cost_factor', 'licence', )

	# textarea input is better for comments
	def get_form(self, request, obj=None, **kwargs):
	kwargs['widgets'] = {'comment': forms.Textarea}
	return super().get_form(request, obj, **kwargs)


	@admin.register(ConditionType)
	class ConditionTypeAdmin(ImportExportModelAdmin):
	list_display = ("id", "condition_issuer")


	#class JournalConditionInline(InlineActionsMixin, TabularInline):
	class JournalConditionInline(TabularInline):
	model = JournalCondition
	extra = 1
	inline_actions = ['connect_all_journals']

	def connect_all_journals(self, request, obj, parent_obj=None):
	# Do stuff here, then return None to go to current view
	return None

	connect_all_journals.short_description = ("Connect Condition Set with some or all Journals")


	class OrganizationConditionInline(TabularInline):
	#class OrganizationConditionInline(InlineActionsMixin, TabularInline):
	model = OrganizationCondition
	extra = 1


	def connect_with_all_journals(modeladmin, request, queryset):
	# print(request.POST)
	if request.POST.get('apply'):
	try:
	valid_from = date.fromisoformat(request.POST['valid_from'])
	valid_until = date.fromisoformat(request.POST['valid_until'])
	#issn_list = [x for x in request.POST['issn_list'].replace(',','\n',).replace(';','\n').replace(' ','\n').replace('\r','\n',).split('\n') if len(x) > 0]
	issn_list = set([x for x in re.split(' \|,\|;\|\n\|\r\|\t', request.POST['issn_list']) if len(x) > 0])
	print(issn_list)
	if valid_from > valid_until:
	raise ValueError
	# print((valid_from, valid_until))
	if len(issn_list) == 0:
	all_journals = Journal.objects.all()
	else:
	# all_journals = [issn.journal for issn in Issn.objects.filter(issn__in=issn_list).distinct()]
	journal_ids = list(Issn.objects.filter(issn__in=issn_list).values_list('journal', flat=True).distinct())
	# print(journal_ids)
	all_journals = Journal.objects.filter(id__in=journal_ids)
	print(all_journals)
	print(len(issn_list), len(all_journals))
	# all_journals =[]
	# The following block could certainly be optimized! AB 2021-08-12
	for condition_set in queryset:
	# print('-----------------')
	# print(condition_set)
	for j in all_journals:
	# print(j)
	# search for existing connections
	existing_connections = JournalCondition.objects.filter(journal=j,
	condition_set=condition_set,
	valid_from__lt=date.today(),
	valid_until__gt=date.today())
	# print(existing_connections)
	if len(existing_connections) == 0:
	new_journal_condition = JournalCondition(journal=j,
	condition_set=condition_set,
	valid_from=valid_from,
	valid_until=valid_until)
	new_journal_condition.save()
	else:
	# This should not happen, or could it?
	print(f'{j} already connected with {condition_set}')
	return None

	except ValueError:
	pass
	return render(request, 'admin/get_validity_dates.html', context={'queryset': queryset, 'objects': 'journals'})


	connect_with_all_journals.short_description = 'Apply selected condition sets to multiple Journals'


	def connect_with_all_organizations(modeladmin, request, queryset):
	if request.POST.get('apply'):
	try:
	valid_from = date.fromisoformat(request.POST['valid_from'])
	valid_until = date.fromisoformat(request.POST['valid_until'])
	if valid_from > valid_until:
	raise ValueError
	# print((valid_from, valid_until))
	all_orgs = Organization.objects.all()
	for condition_set in queryset:
	# print('-----------------')
	# print(condition_set)
	for o in all_orgs:
	# print(o)
	# search for existing connections
	existing_connections = OrganizationCondition.objects.filter(organization=o,
	condition_set=condition_set,
	valid_from__lt=date.today(),
	valid_until__gt=date.today())
	# print(existing_connections)
	if len(existing_connections) == 0:
	new_organization_condition = OrganizationCondition(organization=o,
	condition_set=condition_set,
	valid_from=valid_from,
	valid_until=valid_until)
	new_organization_condition.save()
	return None

	except ValueError:
	pass
	return render(request, 'admin/get_validity_dates.html', context={'queryset': queryset, 'objects': 'organizations'})


	connect_with_all_organizations.short_description = 'Apply selected condition sets to all Organizations'


	def end_validity(modeladmin, request, queryset):
	# print(request.POST)
	if request.POST.get('apply'):
	try:
	valid_until = date.fromisoformat(request.POST['date'])
	print(valid_until)

	for x_condition in queryset:
	x_condition.valid_until = valid_until
	x_condition.save()
	return None

	except ValueError:
	pass
	return render(request, 'admin/get_single_validity_date.html',
	context={'queryset': queryset, 'limit': 'end', 'objects': 'selected journal-condition connections'})

	end_validity.short_description = 'Set valid_until date'


	@admin.register(ConditionSet)
	class ConditionSetAdmin(ImportExportModelAdmin):
	# class ConditionSetAdmin(InlineActionsModelAdminMixin, ImportExportModelAdmin):
	list_display = ("id", "condition_type", "comment")
	search_fields = ['organization__name', 'journal__name', 'comment']
	list_filter = ('condition_type', )
	filter_horizontal = ('term', )
	inlines = (OrganizationConditionInline, JournalConditionInline, )
	actions = [connect_with_all_journals, connect_with_all_organizations]

	# textarea input is better for comments
	def get_form(self, request, obj=None, **kwargs):
	kwargs['widgets'] = {'comment': forms.Textarea}
	return super().get_form(request, obj, **kwargs)


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

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

	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 (
	('true', _('True')),
	('false', _('False')),
	)

	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 '80s' or '90s')
	# to decide how to filter the queryset.
	if self.value() == 'true':
	return queryset.filter(valid_from__lte=date.today(),
	valid_until__gte=date.today())
	if self.value() == 'false':
	return queryset.exclude(valid_from__lte=date.today(),
	valid_until__gte=date.today())


	class ConditionSetListDynamicFilter(SimpleListFilter):
	title = _('condition sets (publisher-dependant)')

	parameter_name = 'condition_set'

	def lookups(self, request, model_admin):
	if 'journal__publisher__name' in request.GET:
	# A publisher name filter is in effect
	journal_publisher_name = request.GET['journal__publisher__name']
	condition_sets = set([c.condition_set for c in model_admin.model.objects.all().filter(journal__publisher__name=journal_publisher_name)])
	else:
	condition_sets = set([c.condition_set for c in model_admin.model.objects.all()])
	return [(s.id, str(s)) for s in condition_sets]

	def queryset(self, request, queryset):
	if self.value():
	return queryset.filter(condition_set__id__exact=self.value())


	@admin.register(OrganizationCondition)
	class OrganizationConditionAdmin(ImportExportModelAdmin):

	def link_to_conditionset(self, obj):
	link = reverse("admin:django_api_conditionset_change", args=[obj.condition_set.id])
	return format_html(f'<a href="{link}">{obj.condition_set}</a>')
	link_to_conditionset.short_description = 'Condition Set'

	#list_display = ("id", "organization_name", "condition_set", "valid_from", "valid_until")
	list_display = ("id", "organization_name", "link_to_conditionset", "valid_from", "valid_until")
	list_filter = ('condition_set__condition_type', XConditionValidListFilter,
	('condition_set', RelatedOnlyFieldListFilter))

	def organization_name(self, obj):
	return obj.organization.name


	@admin.register(Licence)
	class LicenceAdmin(ImportExportModelAdmin):
	pass


	@admin.register(JournalCondition)
	class JournalConditionAdmin(ImportExportModelAdmin):

	def link_to_conditionset(self, obj):
	link = reverse("admin:django_api_conditionset_change", args=[obj.condition_set.id])
	return format_html(f'<a href="{link}">{obj.condition_set}</a>')
	link_to_conditionset.short_description = 'Condition Set'

	list_display = ("id", "journal_name", "link_to_conditionset", "valid_from", "valid_until")
	list_filter = ('condition_set__condition_type', XConditionValidListFilter,
	'journal__publisher__name',
	ConditionSetListDynamicFilter)
	actions =(end_validity,)

	def journal_name(self, obj):
	return obj.journal.name

	# unsuccessful attempt
	# def formfield_for_foreignkey(self, db_field, request, **kwargs):
	# if db_field.name == "journal":
	# kwargs["queryset"] = Journal.objects.filter(publisher__name__in=Publisher.objects.order_by().values('name').distinct())
	# return super().formfield_for_foreignkey(db_field, request, **kwargs)


	@admin.register(Cost_factor)
	class Cost_factorAdmin(ImportExportModelAdmin):
	list_display = ("id", "comment", "amount", "symbol")
	list_filter = ('cost_factor_type', 'symbol')

	# textarea input is better for comments
	def get_form(self, request, obj=None, **kwargs):
	kwargs['widgets'] = {'comment': forms.Textarea}
	return super().get_form(request, obj, **kwargs)


	@admin.register(Cost_factor_type)
	class Cost_factor_typeAdmin(ImportExportModelAdmin):
	list_display = ("id", "name")

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