from django.contrib import admin
from django.contrib.auth.models import Group
from django.db import models
from django.forms import widgets, ModelForm
from django.core.exceptions import ValidationError

from polymorphic.admin import PolymorphicParentModelAdmin, PolymorphicChildModelAdmin, PolymorphicChildModelFilter
from reversion.admin import VersionAdmin
from django_reverse_admin import ReverseModelAdmin
from solo.admin import SingletonModelAdmin
from django.utils.safestring import mark_safe


# Todo: reversion

import seminar.models as m
import seminar.treelib as tl

admin.site.register(m.Skola)
admin.site.register(m.Prijemce)
admin.site.register(m.Rocnik)

class CisloForm(ModelForm):
	class Meta:
		model = m.Cislo
		fields = '__all__'
	
	def clean(self):
		if self.cleaned_data.get('verejne_db') == False:
			return self.cleaned_data
		cn = m.CisloNode.objects.get(cislo=self.instance)
		errors = []
		for ch in tl.all_children(cn):
			if isinstance(ch, m.TemaVCisleNode):
				if ch.tema.stav not in \
					(m.Problem.STAV_ZADANY, m.Problem.STAV_VYRESENY):
					errors.append(ValidationError('Téma %(tema)s není zadané ani vyřešené', params={'tema':ch.tema}))
				
			if isinstance(ch, m.UlohaZadaniNode) or isinstance(ch, m.UlohaVzorakNode):
				if ch.uloha.stav not in \
					(m.Problem.STAV_ZADANY, m.Problem.STAV_VYRESENY):
					errors.append(ValidationError('Úloha %(uloha)s není zadaná ani vyřešená', params={'uloha':ch.uloha}))
			if isinstance(ch, m.ReseniNode):
				for problem in ch.reseni.problem_set:
					if problem not in \
						(m.Problem.STAV_ZADANY, m.Problem.STAV_VYRESENY):
						errors.append(ValidationError('Problém %s není zadaný ani vyřešený', code=problem))
		if errors:
			errors.append(ValidationError(mark_safe('<b>Pokud chceš učinit všechny problémy, co nejsou zadané ani vyřešené, zadanými a číslo zveřejnit, můžeš to udělat pomocí akce v <a href="/admin/seminar/cislo">seznamu čísel</a></b>')))
			raise ValidationError(errors)
		return self.cleaned_data


@admin.register(m.Cislo)
class CisloAdmin(admin.ModelAdmin):
	form = CisloForm
	actions = ['force_publish']

	def force_publish(self,request,queryset):
		for cislo in queryset:
			cn = m.CisloNode.objects.get(cislo=cislo)
			for ch in tl.all_children(cn):
				if isinstance(ch, m.TemaVCisleNode):
					if ch.tema.stav not in (m.Problem.STAV_ZADANY, m.Problem.STAV_VYRESENY):
						ch.tema.stav = m.Problem.STAV_ZADANY
						ch.tema.save()
					
				if isinstance(ch, m.UlohaZadaniNode) or isinstance(ch, m.UlohaVzorakNode):
					if ch.uloha.stav not in (m.Problem.STAV_ZADANY, m.Problem.STAV_VYRESENY):
						ch.uloha.stav = m.Problem.STAV_ZADANY
						ch.uloha.save()
				if isinstance(ch, m.ReseniNode):
					for problem in ch.reseni.problem_set:
						if problem not in (m.Problem.STAV_ZADANY, m.Problem.STAV_VYRESENY):
							problem.stav = m.Problem.STAV_ZADANY
							problem.save()
			cislo.verejne_db = True
			cislo.save()

	force_publish.short_description = 'Zveřejnit vybraná čísla a všechny návrhy úloh v nich učinit zadanými'

@admin.register(m.Osoba)
class OsobaAdmin(admin.ModelAdmin):
	actions = ['synchronizuj_maily', 'udelej_orgem']

	def synchronizuj_maily(self, request, queryset):
		for o in queryset:
			if o.user is not None:
				u = o.user
				u.email = o.email
				u.save()
		self.message_user(request, "E-maily synchronizovány.")
	synchronizuj_maily.short_description = "Synchronizuj vybraným osobám e-maily do uživatelů"

	def udelej_orgem(self,request,queryset):
		org_group = Group.objects.get(name='org')
		print(queryset)
		for o in queryset:
			user = o.user
			print(user)
			user.groups.add(org_group)
			user.is_staff = True
			user.save()
			org = m.Organizator.objects.create(osoba=o)
			org.save()
	udelej_orgem.short_description = "Udělej vybraných osob organizátory"

@admin.register(m.Organizator)
class OrganizatorAdmin(admin.ModelAdmin):
	search_fields = ['osoba__jmeno', 'osoba__prijmeni', 'osoba__prezdivka']
			
@admin.register(m.Resitel)
class ResitelAdmin(admin.ModelAdmin):
	search_fields = ['osoba__jmeno', 'osoba__prijmeni', 'osoba__prezdivka']
	ordering = ('osoba__jmeno','osoba__prijmeni')

@admin.register(m.Problem)
class ProblemAdmin(PolymorphicParentModelAdmin):
	base_model = m.Problem
	child_models = [
		m.Tema,
		m.Clanek,
		m.Uloha,
		m.Konfera,
		]
	# Pokud chceme orezavat na aktualni rocnik, musime do modelu pridat odkaz na rocnik. Zatim bere vse.
	search_fields = ['nazev']

# V ProblemAdmin to nejde, protoze se to nepropise do deti
class ProblemAdminMixin(object):
	show_in_index = True
	autocomplete_fields = ['nadproblem','autor','garant']
	filter_horizontal = ['opravovatele']


@admin.register(m.Tema)
class TemaAdmin(ProblemAdminMixin,PolymorphicChildModelAdmin):
	base_model = m.Tema

@admin.register(m.Clanek)
class ClanekAdmin(ProblemAdminMixin,PolymorphicChildModelAdmin):
	base_model = m.Clanek

@admin.register(m.Uloha)
class UlohaAdmin(ProblemAdminMixin,PolymorphicChildModelAdmin):
	base_model = m.Uloha

@admin.register(m.Konfera)
class KonferaAdmin(ProblemAdminMixin,PolymorphicChildModelAdmin):
	base_model = m.Konfera


class TextAdminInline(admin.TabularInline):
	model = m.Text
	formfield_overrides = {
		models.TextField: {'widget': widgets.TextInput}
	}
	exclude = ['text_zkraceny_set','text_zkraceny']

admin.site.register(m.Text)

class ResitelInline(admin.TabularInline):
	model = m.Resitel
	extra = 1

class SoustredeniUcastniciInline(admin.TabularInline):
	model = m.Soustredeni_Ucastnici
	extra = 1
	fields = ['resitel','poznamka']
	autocomplete_fields = ['resitel']
	ordering = ['resitel__osoba__jmeno', 'resitel__osoba__prijmeni']
	formfield_overrides = {
		models.TextField: {'widget': widgets.TextInput}
	}

	def get_queryset(self,request):
		qs = super().get_queryset(request)
		return qs.select_related('resitel','soustredeni')

class SoustredeniOrganizatoriInline(admin.TabularInline):
	model = m.Soustredeni.organizatori.through
	extra = 1
	fields = ['organizator','poznamka']
	autocomplete_fields = ['organizator']
	ordering = ['organizator__osoba__jmeno','organizator__prijmeni']
	formfield_overrides = {
		models.TextField: {'widget': widgets.TextInput}
	}

	def get_queryset(self,request):
		qs = super().get_queryset(request)
		return qs.select_related('organizator', 'soustredeni')


@admin.register(m.Soustredeni)
class SoustredeniAdmin(admin.ModelAdmin):
	model = m.Soustredeni
	inline_type = 'tabular'
	inlines = [SoustredeniUcastniciInline, SoustredeniOrganizatoriInline]


class PrilohaReseniInline(admin.TabularInline):
	model = m.PrilohaReseni
	extra = 1
admin.site.register(m.PrilohaReseni)

class Reseni_ResiteleInline(admin.TabularInline):
	model = m.Reseni_Resitele


@admin.register(m.Reseni)
class ReseniAdmin(ReverseModelAdmin):
	base_model = m.Reseni
	inline_type = 'tabular'
	inline_reverse = ['text_cely','resitele']
	exclude = ['text_zkraceny', 'text_zkraceny_set']
	inlines = [PrilohaReseniInline]
# FAIL in template
#	inlines = [PrilohaReseniInline,Reseni_ResiteleInline]

admin.site.register(m.Hodnoceni)
admin.site.register(m.Pohadka)
admin.site.register(m.Obrazek)

# Polymorfismus pro stromy
# TODO: Inlines podle https://django-polymorphic.readthedocs.io/en/stable/admin.html

@admin.register(m.TreeNode)
class TreeNodeAdmin(PolymorphicParentModelAdmin):
	base_model = m.TreeNode
	child_models = [
		m.RocnikNode,
		m.CisloNode,
		m.MezicisloNode,
		m.TemaVCisleNode,
		m.UlohaZadaniNode,
		m.PohadkaNode,
		m.UlohaVzorakNode,
		m.TextNode,
		m.CastNode,
		m.OrgTextNode,
		]

	actions = ['aktualizuj_nazvy']

	# XXX: nejspíš je to totální DB HOG, nechcete to použít moc často.
	def aktualizuj_nazvy(self, request, queryset):
		newqs = queryset.get_real_instances()
		for tn in newqs:
			tn.aktualizuj_nazev()
			tn.save()
		self.message_user(request, "Názvy aktualizovány.")
	aktualizuj_nazvy.short_description = "Aktualizuj vybraným TreeNodům názvy"

@admin.register(m.RocnikNode)
class RocnikNodeAdmin(PolymorphicChildModelAdmin):
	base_model = m.RocnikNode
	show_in_index = True

@admin.register(m.CisloNode)
class CisloNodeAdmin(PolymorphicChildModelAdmin):
	base_model = m.CisloNode
	show_in_index = True

@admin.register(m.MezicisloNode)
class MezicisloNodeAdmin(PolymorphicChildModelAdmin):
	base_model = m.MezicisloNode
	show_in_index = True

@admin.register(m.TemaVCisleNode)
class TemaVCisleNodeAdmin(PolymorphicChildModelAdmin):
	base_model = m.TemaVCisleNode
	show_in_index = True

@admin.register(m.UlohaZadaniNode)
class UlohaZadaniNodeAdmin(PolymorphicChildModelAdmin):
	base_model = m.UlohaZadaniNode
	show_in_index = True

@admin.register(m.PohadkaNode)
class PohadkaNodeAdmin(PolymorphicChildModelAdmin):
	base_model = m.PohadkaNode
	show_in_index = True

@admin.register(m.UlohaVzorakNode)
class UlohaVzorakNodeAdmin(PolymorphicChildModelAdmin):
	base_model = m.UlohaVzorakNode
	show_in_index = True

@admin.register(m.TextNode)
class TextNodeAdmin(PolymorphicChildModelAdmin):
	base_model = m.TextNode
	show_in_index = True

@admin.register(m.CastNode)
class TextNodeAdmin(PolymorphicChildModelAdmin):
	base_model = m.CastNode
	show_in_index = True
	fields = ('nadpis',)

@admin.register(m.OrgTextNode)
class TextNodeAdmin(PolymorphicChildModelAdmin):
	base_model = m.OrgTextNode
	show_in_index = True


admin.site.register(m.Nastaveni, SingletonModelAdmin)
admin.site.register(m.Novinky)