# -*- 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.widgets import CKEditorWidget
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, Prispevek, Pohadka, Konfera
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 = ['timestamp', 'soubor', 'poznamka']
    readonly_fields = ['timestamp']
    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', 'typ', 'nazev', 'body', 'opravovatel', '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=['resitel'], fields=['resitel'])
    model = Reseni
    fields = ['resitel', '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', '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(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 = ['timestamp', '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'])
    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 = ['jmeno', 'prijmeni', 'user', 'pohlavi_muz', 'skola', 'rok_maturity', 'pocet_reseni']
    list_filter = ['pohlavi_muz', 'rok_maturity', 'zasilat']
    search_fields = ['jmeno', 'prijmeni', 'ulice', 'mesto', 'email']
    inlines = [ReseniKResiteliInline]
    view_on_site = False

    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'
            ]
        }),
        (u'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, u'Zveřejnit číslo'),
            make_set_action('verejne_db', False, u'Skrýt (zneveřejnit) číslo'),
            make_set_action('verejna_vysledkovka', True, u'Zveřejnit výsledkovku'),
            make_set_action('verejna_vysledkovka', False, u'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', 'resitel'], fields=['problem', 'resitel'])
    fieldsets = [
        (None,              {'fields': ['problem', 'resitel', 'forma', 'body', 'cislo_body', 'timestamp']}),
        (u'Poznámky',       {'fields': ['poznamka']}),
        ]
    readonly_fields = ['timestamp']
    list_display = ['problem', 'resitel', '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('resitel', '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(
        Problem.objects.filter(typ=Problem.TYP_ULOHA)
    )

    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',
        'timestamp'
    ]

    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=CKEditorWidget(), required=False, **field_labels(Problem, 'text_zadani'))
    text_reseni = forms.CharField(widget=CKEditorWidget(), required=False, **field_labels(Problem, 'text_reseni'))
    text_org = forms.CharField(widget=CKEditorWidget(), 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 = []

    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': ['cislo_zadani', '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


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

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=CKEditorWidget(), required=False,
            **field_labels(Prispevek, 'text_org'))
    text_resitel = forms.CharField(widget=CKEditorWidget(), 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=CKEditorWidget(), 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']}),
        (u'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=CKEditorWidget(), 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_roku']
    list_display = [jmeno_organizatora, je_organizator_aktivni,]
    actions = [zaktivovat_organizatory, deaktivovat_organizatory,]