# -*- coding: utf-8 -*-

from django.contrib import admin
from django import forms
from django.forms import widgets
from reversion.admin import VersionAdmin
from solo.admin import SingletonModelAdmin
from ckeditor_uploader.widgets import CKEditorUploadingWidget
from django.db.models import Count
from django.db import models
from django.utils.safestring import mark_safe
from django.core.urlresolvers import reverse

from django.contrib.auth.models import User

from seminar.models import Skola, Resitel, Rocnik, Cislo, Problem, Reseni, PrilohaReseni, Nastaveni, Soustredeni, Soustredeni_Ucastnici, Soustredeni_Organizatori, Novinky, Organizator, Pohadka, Konfera, Uloha
from autocomplete_light import shortcuts as autocomplete_light


class UserModelChoiceField(forms.ModelChoiceField):
    u"""Vlastní ModelChoiceField pro uživatele. Zobrazí kromě loginu i jméno.
    """
    def label_from_instance(self, obj):
        return u"{} ({})".format(obj.get_full_name(), obj.username)

def get_form_predvypln_autora(self, request, obj=None, *args, **kwargs):
    u"""get_form fce pro Adminy. Předvyplňí přihlášeného uživatele jako autora.
    """
    form = super(self.__class__, self).get_form(request, *args, **kwargs)
    form.base_fields['autor'].initial = request.user.id
    return form


def make_set_action(atribut, hodnota, nazev):
    u"""
    Pomocnik pro rychle vytvareni hromadnych admin akci ktere jen nastavuji
    atribut (dany jako string) na danou hodnotu.
    nazev je krátký popis akce pro admin rozhraní."""
    def action_f(modeladmin, request, queryset):
        for obj in queryset:
            assert atribut in obj.__dict__
            obj.__setattr__(atribut, hodnota)
            obj.save()
    action_f.short_description = nazev
    # Trik: je potřeba, aby se funkce různě (ale libovolně) jmenovaly,
    # jinak je Django v seznamu akcí splácne do jedné
    action_f.__name__ = 'action_f_%d_%d_%d' % (id(atribut), id(hodnota), id(nazev), )
    return action_f


### Globální nastavení

admin.site.register(Nastaveni, SingletonModelAdmin)


### UTILS (pro verbose_name a help_text)

def field_labels(model, fieldname):
    f = [i for i in model._meta.fields if i.name == fieldname][0]
    return {'label': f.verbose_name.capitalize(), 'help_text': f.help_text, }

def create_modeladmin(modeladmin, model, name = None, verbose_name = None, verbose_name_plural = None):
    
    class  Meta:
        proxy = True
        app_label = model._meta.app_label
    Meta.verbose_name = verbose_name
    Meta.verbose_name_plural = verbose_name_plural

    attrs = {'__module__': '', 'Meta': Meta}
    newmodel = type(name, (model,), attrs)
    admin.site.register(newmodel, modeladmin)
    return modeladmin

### INLINES

class ResitelInline(admin.TabularInline):
    model = Resitel
    fields = ['jmeno', 'prijmeni', 'skola', 'mesto', 'rok_maturity', ]
    readonly_fields = ['jmeno', 'prijmeni', 'skola', 'mesto', 'rok_maturity', ]
    extra = 0
    view_on_site = False

    def has_add_permission(self, req): return False


class CisloInline(admin.TabularInline):
    model = Cislo
    fields = ['cislo',
              'datum_vydani', 'datum_deadline', 'datum_deadline_soustredeni',
              'verejne_db', 'poznamka']
    readonly_fields = ['cislo']
    extra = 0
    formfield_overrides = {
        models.TextField: {'widget': forms.TextInput},
    }
    view_on_site = Cislo.verejne_url

    def has_add_permission(self, req): return False


class PrilohaReseniInline(admin.StackedInline):
    model = PrilohaReseni
    fields = ['vytvoreno', 'soubor', 'poznamka']
    readonly_fields = ['vytvoreno']
    formfield_overrides = {
        models.TextField: {'widget': forms.TextInput},
    }
    view_on_site = False

    extra = 0


class ProblemInline(admin.TabularInline):
    model = Problem
    fk_name = 'cislo_zadani'
    fields = ['kod', 'nazev', 'autor', 'garant', 'opravovatele', 'stav']
    formfield_overrides = {
        models.TextField: {'widget': forms.TextInput},
    }
    view_on_site = Problem.verejne_url

    extra = 0


class ReseniKProblemuInline(admin.TabularInline):
    form = autocomplete_light.modelform_factory(Reseni, autocomplete_fields=['resitele'], fields=['resitele'])
    model = Reseni
    fields = ['resitele', 'forma', 'body', 'cislo_body', 'timestamp', 'poznamka']
    readonly_fields = ['timestamp']
    extra = 0
    formfield_overrides = {
        models.TextField: {'widget': forms.TextInput},
    }
    view_on_site = False

    def get_queryset(self, request):
        qs = super(ReseniKProblemuInline, self).get_queryset(request)
        return qs.select_related('problem', 'cislo_body', 'resitele')

    # Potenciální DB HOG (cislo_body se dotazovalo na cisla pri kazdem zobrazeni jejich selectu ...)
    def formfield_for_dbfield(self, db_field, **kwargs):
        formfield = super(ReseniKProblemuInline, self).formfield_for_dbfield(db_field, **kwargs)
        if db_field.name == 'cislo_body':
            # dirty trick so queryset is evaluated and cached in .choices
            formfield.choices = formfield.choices
        return formfield


class ReseniKResiteliInline(admin.TabularInline):
    model = Reseni
    fields = ['problem', 'forma', 'body', 'cislo_body', 'timestamp', 'poznamka']
    readonly_fields = ['cas_doruceni', 'problem']
    extra = 0
    formfield_overrides = {
        models.TextField: {'widget': forms.TextInput},
    }
    view_on_site = False

    def has_add_permission(self, req): return False

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

    # Potenciální DB HOG (cislo_body se dotazovalo na cisla pri kazdem zobrazeni jejich selectu ...)
    def formfield_for_dbfield(self, db_field, **kwargs):
        formfield = super(ReseniKResiteliInline, self).formfield_for_dbfield(db_field, **kwargs)
        if db_field.name == 'cislo_body':
            # dirty trick so queryset is evaluated and cached in .choices
            formfield.choices = formfield.choices
        return formfield


class Soustredeni_UcastniciInline(admin.TabularInline):
    form = autocomplete_light.modelform_factory(Soustredeni_Ucastnici, autocomplete_fields=['resitel'], fields=['resitel'])
    model = Soustredeni_Ucastnici
    fields = ['resitel', 'poznamka', ]
    extra = 0
    formfield_overrides = {
        models.TextField: {'widget': forms.TextInput},
    }

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


class Soustredeni_OrganizatoriInline(admin.TabularInline):
    form = autocomplete_light.modelform_factory(Soustredeni_Organizatori, autocomplete_fields=['organizator'], fields=['organizator'],)
    model = Soustredeni_Organizatori
    fields = ['organizator', 'poznamka', ]
    extra = 0
    formfield_overrides = {
        models.TextField: {'widget': forms.TextInput},
    }

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

### Resitel

class ResitelAdmin(VersionAdmin):
    form = autocomplete_light.modelform_factory(Resitel, autocomplete_fields=['skola'], fields=['skola'])
    fk_name = 'osoba'
    fieldsets = [
        (None,              {'fields': ['jmeno', 'prijmeni', 'user']}),
        (u'Škola',          {'fields': ['skola', 'rok_maturity']}),
        (u'Seminář',        {'fields': ['datum_souhlasu_udaje', 'datum_souhlasu_zasilani', 'datum_prihlaseni', 'zasilat']}),
        (u'Osobní údaje',   {'fields': ['pohlavi_muz', 'datum_narozeni', 'email', 'telefon']}),
        (u'Adresa',         {'fields': ['ulice', 'mesto', 'psc', 'stat']}),
        ]
    list_display = ['osoba__jmeno', 'osoba__prijmeni', 'osoba__user', 'osoba__pohlavi_muz', 'skola', 'rok_maturity', 'pocet_reseni']
    list_filter = ['osoba__pohlavi_muz', 'rok_maturity', 'zasilat']
    search_fields = ['osoba__jmeno', 'osoba__prijmeni', 'osoba__ulice', 'osoba__mesto', 'osoba__email']
    inlines = [ReseniKResiteliInline]
    view_on_site = False

    def osoba__jmeno(self, obj):
        return obj.osoba.jmeno
    
    def osoba__prijmeni(self, obj):
        return obj.osoba.prijmeni
    
    def osoba__user(self, obj):
        return obj.osoba.user

    def osoba__pohlavi_muz(self, obj):
        return obj.osoba.pohlavi_muz

    def osoba__ulice(self, obj):
        return obj.osoba.ulice

    def osoba__mesto(self, obj):
        return obj.osoba.mesto

    def osoba__email(self, obj):
        return obj.osoba.email

    def get_queryset(self, request):
        qs = super(ResitelAdmin, self).get_queryset(request)
        return qs.select_related('skola', 'user').annotate(pocet_reseni=Count('reseni'))

    def pocet_reseni(self, obj):
        return obj.pocet_reseni


admin.site.register(Resitel, ResitelAdmin)


### Skola

class SkolaAdmin(VersionAdmin):
    fieldsets = [
        (None,              {'fields': ['nazev', 'kratky_nazev', 'je_zs', 'je_ss']}),
        (u'Interní ID',     {'fields': ['aesop_id', 'izo'], 'classes': ['collapse']}),
        (u'Adresa',         {'fields': ['ulice', 'mesto', 'psc', 'stat']}),
        (None,              {'fields': ['poznamka']}),
        ]
    list_display = ['nazev', 'aesop_id', 'mesto', 'ulice', 'stat', 'je_zs', 'je_ss']
    list_filter = ['stat', 'je_zs', 'je_ss']
    search_fields = ['nazev', 'mesto', 'ulice']
    inlines = [ResitelInline]
    view_on_site = False

admin.site.register(Skola, SkolaAdmin)


### Cislo

class CisloAdmin(VersionAdmin):
    fieldsets = [
        (None, {
            'fields': [
                'cislo',
                'rocnik',
                'verejne_db',
                'verejna_vysledkovka',
                'faze',
                'poznamka',
                'pdf'
            ]
        }),
        ('Data', {'fields': ['datum_vydani', 'datum_deadline',
                              'datum_deadline_soustredeni']}),
        ]
    list_display = [
        'kod',
        'rocnik',
        'cislo',
        'datum_vydani',
        'datum_deadline',
        'verejne',
        'verejna_vysledkovka'
    ]
    list_filter = ['rocnik']
    view_on_site = Cislo.verejne_url
    actions = [
            make_set_action('verejne_db', True, 'Zveřejnit číslo'),
            make_set_action('verejne_db', False, 'Skrýt (zneveřejnit) číslo'),
            make_set_action('verejna_vysledkovka', True, 'Zveřejnit výsledkovku'),
            make_set_action('verejna_vysledkovka', False, 'Skrýt (zneveřejnit) výsledkovku'),
            ]
    inlines = [ProblemInline]

    def get_queryset(self, request):
        qs = super(CisloAdmin, self).get_queryset(request)
        return qs.select_related('rocnik')

admin.site.register(Cislo, CisloAdmin)

### Rocnik

class RocnikAdmin(VersionAdmin):
    fieldsets = [
        (None,              {'fields': ['rocnik', 'prvni_rok', 'exportovat']}),
        ]
    list_display = ['rocnik', 'prvni_rok', 'exportovat', 'verejne']
    inlines = [CisloInline]
    view_on_site = Rocnik.verejne_url
    actions = [
            make_set_action('exportovat', True, u'Nastavit pro AESOP export'),
            make_set_action('exportovat', False, u'Skrýt pro AESOP export'),
            ]

admin.site.register(Rocnik, RocnikAdmin)


### PrilohaReseni
# NOTE: Nemá pravděpodobně smysl používat
# class PrilohaReseniAdmin(reversion.VersionAdmin):
#     readonly_fields = ['timestamp', 'reseni']
#     fieldsets = [
#         (None,              {'fields': ['reseni', 'soubor', 'timestamp']}),
#         (u'Poznámky',       {'fields': ['poznamka']}),
#         ]
#     list_display = ['reseni', 'soubor', 'timestamp']
#     list_filter = ['reseni', 'timestamp']
#     search_fields = []
# 
# admin.site.register(PrilohaReseni, PrilohaReseniAdmin)


### Reseni

class ReseniAdmin(VersionAdmin):
    #form = autocomplete_light.modelform_factory(Reseni, autocomplete_fields=['problem', 'resitele'], fields=['problem', 'resitele'])
    fieldsets = [
        (None,              {'fields': ['problem', 'resitele', 'forma', 'body', 'cislo_body', 'timestamp']}),
        (u'Poznámky',       {'fields': ['poznamka']}),
        ]
    readonly_fields = ['timestamp']
    list_display = ['problem', 'resitele', 'forma', 'body', 'timestamp', 'cislo_body']
    list_filter = ['body', 'timestamp', 'forma']
    search_fields = []
    inlines = [PrilohaReseniInline]
    view_on_site = False

    def get_queryset(self, request):
        qs = super(ReseniAdmin, self).get_queryset(request)
        return qs.select_related('resitele', 'problem', 'cislo_body')

admin.site.register(Reseni, ReseniAdmin)


### Pohádka

class PohadkaAdminForm(forms.ModelForm):
    class Meta:
        model = Pohadka
        exclude = []
    autor = UserModelChoiceField(User.objects.filter(is_staff=True))
    uloha = forms.ModelChoiceField(
        Uloha.objects.all()
    )

    def __init__(self, *args, **kwargs):
        super(PohadkaAdminForm, self).__init__(*args, **kwargs)
        instance = getattr(self, 'instance', None)

        # viz ProblemAdminForm.__init__
        if instance and instance.pk:
            if instance.uloha and instance.uloha.cislo_zadani:
                if instance.uloha.cislo_zadani.faze != 'admin':
                    self.fields['text'].widget.attrs['readonly'] = True


class PohadkaAdmin(VersionAdmin):
    form = PohadkaAdminForm
    view_on_site = False

    def get_kod_ulohy(self, obj):
        return obj.uloha.kod_v_rocniku()
    get_kod_ulohy.short_description = u'Kód úlohy'

    def get_rocnik(self, obj):
        return obj.uloha.cislo_zadani.rocnik.rocnik
    get_rocnik.short_description = u'Ročník'

    list_display = [
        '__str__',
        'get_rocnik',
        'get_kod_ulohy',
        'uloha',
        'autor'
    ]

    get_form = get_form_predvypln_autora

class PohadkaKProblemuInline(admin.TabularInline):
    form = PohadkaAdminForm
    model = Pohadka
    exclude = []
    extra = 0

admin.site.register(Pohadka, PohadkaAdmin)


### Problem

from autocomplete_light.contrib.taggit_field import TaggitField, TaggitWidget


class ProblemAdminForm(forms.ModelForm):
    #text_zadani = forms.CharField(widget=CKEditorUploadingWidget(), required=False, **field_labels(Problem, 'text_zadani'))
    #text_reseni = forms.CharField(widget=CKEditorUploadingWidget(), required=False, **field_labels(Problem, 'text_reseni'))
    #text_org = forms.CharField(widget=CKEditorUploadingWidget(), required=False, **field_labels(Problem, 'text_org'))
    zamereni = TaggitField(widget=TaggitWidget('TagAutocomplete'), required=False)
    autor = UserModelChoiceField(User.objects.filter(is_staff=True))
    opravovatel = UserModelChoiceField(User.objects.filter(is_staff=True), required=False)
    class Meta:
        model = Problem
        exclude = ['nadproblem']

    def __init__(self, *args, **kwargs):
        super(ProblemAdminForm, self).__init__(*args, **kwargs)
        instance = getattr(self, 'instance', None)

        # Nedovol měnit název a zadání resp. řešení, pokud je cislo_zadani
        # resp. cislo_reseni mimo fázi admin.
        #
        # Nastavení readonly fields sice vypadá lépe (nevygeneruje input tag),
        # ale při ukládání změny vypíše admin nespecifikovanou chybu, která je
        # způsobena zřejmě tím, že se neodešle žádná hodnota pro povinné pole
        # nazev. Navíc by se smazalo nepovinné pole zadání.
        #
        # Toto řešení je z http://stackoverflow.com/a/325038/4786205.
        #
        # TODO Django 1.9: použít field s atributem disabled?
        if instance and instance.pk:
            if instance.cislo_zadani and instance.cislo_zadani.faze != 'admin':
                # CKEditor neumí readonly ...
                self.fields['text_zadani'] = forms.CharField(
                    widget=forms.Textarea,
                    required=False
                )
                for f in ['nazev', 'text_zadani', 'body']:
                    self.fields[f].widget.attrs['readonly'] = True
            if instance.cislo_reseni and instance.cislo_reseni.faze != 'admin':
                self.fields['text_reseni'] = forms.CharField(
                    widget=forms.Textarea,
                    required=False
                )
                self.fields['text_reseni'].widget.attrs['readonly'] = True


class ProblemAdmin(VersionAdmin):
    form = ProblemAdminForm
    fieldsets = [
        (None,              {'fields': ['nazev', 'typ', 'stav', 'autor', 'zamereni', 'body', 'timestamp', 'import_dakos_id']}),
        (u'Vydání',         {'fields': ['kod', 'cislo_reseni', 'opravovatel',]}),
        (None,              {'fields': ['text_zadani', 'text_reseni', 'text_org',]}),
        ]
    list_select_related = True
    search_fields = ['nazev', 'text_zadani', 'text_reseni', 'text_org']
    view_on_site = Problem.verejne_url
    ordering = ['-timestamp']

    readonly_fields = ['timestamp', 'import_dakos_id']

    def get_queryset(self, request):
        qs = super(ProblemAdmin, self).get_queryset(request)
        return qs.select_related('autor', 'opravovatel', 'cislo_zadani', 'cislo_reseni')

    def pocet_reseni(self, obj):
        return obj.pocet_reseni

class ProblemNavrhAdmin(ProblemAdmin):
    list_display = ['nazev', 'typ', 'stav', 'autor', 'timestamp']
    list_filter = ['typ', 'zamereni', 'timestamp', 'stav']

    def get_queryset(self, request):
        qs = super(ProblemNavrhAdmin, self).get_queryset(request)
        return qs.filter(stav__in=[Problem.STAV_NAVRH, Problem.STAV_SMAZANY])

    get_form = get_form_predvypln_autora


#FIXME
#create_modeladmin(ProblemNavrhAdmin, Problem, 'ProblemNavrh', verbose_name=u'Problém (návrh)', verbose_name_plural=u'Problémy (návrhy)')


class ProblemZadanyAdmin(ProblemAdmin):
    list_display = [
        'nazev',
        'typ',
        'cislo_zadani_link',
        'cislo_reseni_link',
        'autor',
        'opravovatel',
        'kod',
        'verejne'
    ]
    list_filter = [
        'typ', 'zamereni', 'cislo_zadani__cislo', 'cislo_zadani__rocnik'
    ]

    def cislo_zadani_link(self, obj):
        if not obj.cislo_zadani:
            return ""
        return mark_safe('<a href="{}">{}</a>'.format(
            reverse("admin:seminar_cislo_change", args=(obj.cislo_zadani.pk,)),
            obj.cislo_zadani
        ))
    cislo_zadani_link.short_description = u'Číslo zadání'

    # TODO pokud se budou odkazy v adminu více používat, možná by se hodilo je
    # nějak zjednodušit, např. tímto?
    # https://github.com/gitaarik/django-admin-relation-links
    def cislo_reseni_link(self, obj):
        if not obj.cislo_reseni:
            return ""
        return mark_safe('<a href="{}">{}</a>'.format(
            reverse("admin:seminar_cislo_change", args=(obj.cislo_reseni.pk,)),
            obj.cislo_reseni
        ))
    cislo_reseni_link.short_description = u'Číslo řešení'

    def get_inline_instances(self, request, obj=None):
        if obj and obj.typ == Problem.TYP_ULOHA:
            inlines = [ReseniKProblemuInline, PohadkaKProblemuInline]
        else:
            inlines = [ReseniKProblemuInline]

        return [inline(self.model, self.admin_site) for inline in inlines]

    def get_queryset(self, request):
        qs = super(ProblemZadanyAdmin, self).get_queryset(request)
        return qs.filter(stav=Problem.STAV_ZADANY)

    get_form = get_form_predvypln_autora

#FIXME
#create_modeladmin(ProblemZadanyAdmin, Problem, 'ProblemZadany', verbose_name=u'Problém (zadaný)', verbose_name_plural=u'Problémy (zadané)')

#admin.site.register(Problem, ProblemAdmin)

### Prispevek (k tematkum)

#class PrispevekAdminForm(forms.ModelForm):
#    text_org = forms.CharField(widget=CKEditorUploadingWidget(), required=False,
#            **field_labels(Prispevek, 'text_org'))
#    text_resitel = forms.CharField(widget=CKEditorUploadingWidget(), required=False,
#            **field_labels(Prispevek, 'text_resitel'))
#
#    class Meta:
#        model = Prispevek
#        exclude = []
#
#class PrispevekAdmin(VersionAdmin):
#    form = PrispevekAdminForm
#    list_display = ['nazev', 'problem', 'reseni', 'zverejnit']
#
#admin.site.register(Prispevek, PrispevekAdmin)

### Soustredeni

class SoustredeniAdminForm(forms.ModelForm):
    text = forms.CharField(widget=CKEditorUploadingWidget(), required=False, **field_labels(Soustredeni, 'text'))
    class Meta:
        model = Soustredeni
        exclude = []

class SoustredeniAdmin(VersionAdmin):
    form = SoustredeniAdminForm
    fieldsets = [
        (None, {'fields': ['rocnik', 'misto', 'typ', 'verejne_db', 'exportovat', 'text']}),
        ('Data', {'fields': ['datum_zacatku', 'datum_konce']}),
        ]
    list_display = ['rocnik', 'misto', 'datum_zacatku', 'typ', 'exportovat', 'verejne']
    inlines = [Soustredeni_UcastniciInline, Soustredeni_OrganizatoriInline]
    list_filter = ['typ', 'rocnik']
    view_on_site = Soustredeni.verejne_url
    actions = [
            make_set_action('verejne_db', True, u'Zveřejnit soustředění'),
            make_set_action('verejne_db', False, u'Skrýt (zneveřejnit) soustředění'),
            make_set_action('exportovat', True, u'Nastavit pro AESOP export'),
            make_set_action('exportovat', False, u'Skrýt pro AESOP export'),
            ]

admin.site.register(Soustredeni, SoustredeniAdmin)

### Konfery
class KonferaAdminForm(forms.ModelForm):
    class Meta:
        model=Konfera
        exclude = []

class KonferaAdmin(VersionAdmin):
    form = KonferaAdminForm
    list_filter = ['soustredeni']
    list_display = ['nazev','soustredeni','organizator','typ_prezentace']
#    inlines = [Konfera_UcastniciInline]

admin.site.register(Konfera,KonferaAdmin)

### Novinky

class NovinkyAdminForm(forms.ModelForm):
    text = forms.CharField(widget=CKEditorUploadingWidget(), required=False,
            **field_labels(Novinky, 'text'))
    autor = UserModelChoiceField(User.objects.filter(is_staff=True))

    class Meta:
        model = Novinky
        exclude = []

def zverejnit_novinky(modeladmin, request, queryset):
    ''' zverejni vybrane novinky '''
    for novinka in queryset:
        novinka.zverejneno = True
        novinka.save()
    zverejnit_novinky.short_description = 'Zveřejnit vybané novinky'

def zneverejnit_novinky(modeladmin, request, queryset):
    ''' zneverejni vybrane novinky'''
    for novinka in queryset:
        novinka.zverejneno = False
        novinka.save()
    zneverejnit_novinky.short_description = 'Zneveřejnit vybrané novinky'


class NovinkyAdmin(VersionAdmin):
    form = NovinkyAdminForm
    list_display = ['datum', 'autor', 'text', 'zverejneno', 'obrazek']
    actions = [zverejnit_novinky, zneverejnit_novinky]

    get_form = get_form_predvypln_autora


admin.site.register(Novinky, NovinkyAdmin)

### Organizator

def jmeno_organizatora(obj):
    ''' vraci jmeno organizatora '''
    jmeno = obj.user.first_name
    if obj.prezdivka:
        jmeno = jmeno + ' "' + obj.prezdivka + '"'
    jmeno = jmeno + ' ' + obj.user.last_name
    if jmeno == ' ': # zobrazeni bezejmennych orgu
        return 'org'
    return jmeno
jmeno_organizatora.short_description = 'Jméno organizátora'

def je_organizator_aktivni(obj):
    ''' zjisti, zda-li je organizator aktivni '''
    return obj.user.is_active
je_organizator_aktivni.short_description = 'Aktivní'
je_organizator_aktivni.boolean = True

def zaktivovat_organizatory(modeladmin, request, queryset):
    ''' vybrane organizatory oznaci jako aktivni '''
    for org in queryset:
        org.user.is_active = True
        org.user.save()
zaktivovat_organizatory.short_description = 'Zaktivovat organizátory'

def deaktivovat_organizatory(modeladmin, request, queryset):
    ''' deaktivuje vybrane organizatory '''
    for org in queryset:
        org.user.is_active = False
        org.user.save()
deaktivovat_organizatory.short_description = 'Deaktivovat organizátory'


@admin.register(Organizator)
class OrganizatorAdmin(VersionAdmin):
    list_filter = ['organizuje_do']
    list_display = [jmeno_organizatora, je_organizator_aktivni,]
    actions = [zaktivovat_organizatory, deaktivovat_organizatory,]