from django import forms
from django.contrib import admin
from django.utils.translation import ugettext_lazy as _
from cof.models import SurveyQuestionAnswer, SurveyQuestion, \
    CofProfile, EventOption, EventOptionChoice, Event, Club, \
    Survey, EventCommentField, EventRegistration
from cof.petits_cours_models import PetitCoursDemande, \
    PetitCoursSubject, PetitCoursAbility, PetitCoursAttribution, \
    PetitCoursAttributionCounter
from django.contrib.auth.models import User, Group, Permission
from django.contrib.auth.admin import UserAdmin
from django.core.urlresolvers import reverse
from django.utils.safestring import mark_safe
from django.db.models import Q

from dal.autocomplete import ModelSelect2


def add_link_field(target_model='', field='', link_text=str,
                   desc_text=str):
    def add_link(cls):
        reverse_name = target_model or cls.model.__name__.lower()

        def link(self, instance):
            app_name = instance._meta.app_label
            reverse_path = "admin:%s_%s_change" % (app_name, reverse_name)
            link_obj = getattr(instance, field, None) or instance
            if not link_obj.id:
                return ""
            url = reverse(reverse_path, args=(link_obj.id,))
            return mark_safe("<a href='%s'>%s</a>"
                             % (url, link_text(link_obj)))
        link.allow_tags = True
        link.short_description = desc_text(reverse_name + ' link')
        cls.link = link
        cls.readonly_fields =\
            list(getattr(cls, 'readonly_fields', [])) + ['link']
        return cls
    return add_link


class SurveyQuestionAnswerInline(admin.TabularInline):
    model = SurveyQuestionAnswer


@add_link_field(desc_text=lambda x: "Réponses",
                link_text=lambda x: "Éditer les réponses")
class SurveyQuestionInline(admin.TabularInline):
    model = SurveyQuestion


class SurveyQuestionAdmin(admin.ModelAdmin):
    search_fields = ('survey__title', 'answer')
    inlines = [
        SurveyQuestionAnswerInline,
    ]


class SurveyAdmin(admin.ModelAdmin):
    search_fields = ('title', 'details')
    inlines = [
        SurveyQuestionInline,
    ]


class EventOptionChoiceInline(admin.TabularInline):
    model = EventOptionChoice


@add_link_field(desc_text=lambda x: "Choix",
                link_text=lambda x: "Éditer les choix")
class EventOptionInline(admin.TabularInline):
    model = EventOption


class EventCommentFieldInline(admin.TabularInline):
    model = EventCommentField


class EventOptionAdmin(admin.ModelAdmin):
    search_fields = ('event__title', 'name')
    inlines = [
        EventOptionChoiceInline,
    ]


class EventAdmin(admin.ModelAdmin):
    search_fields = ('title', 'location', 'description')
    inlines = [
        EventOptionInline,
        EventCommentFieldInline,
    ]


class CofProfileInline(admin.StackedInline):
    model = CofProfile
    inline_classes = ("collapse open",)


class FkeyLookup(object):
    def __init__(self, fkeydecl, short_description=None,
                 admin_order_field=None):
        self.fk, fkattrs = fkeydecl.split('__', 1)
        self.fkattrs = fkattrs.split('__')

        self.short_description = short_description or self.fkattrs[-1]
        self.admin_order_field = admin_order_field or fkeydecl

    def __get__(self, obj, klass):
        if obj is None:
            """
            hack required to make Django validate (if obj is
            None, then we're a class, and classes are callable
            <wink>)
            """
            return self
        item = getattr(obj, self.fk)
        for attr in self.fkattrs:
            item = getattr(item, attr)
        return item


def ProfileInfo(field, short_description, boolean=False):
    def getter(self):
        try:
            return getattr(self.profile, field)
        except CofProfile.DoesNotExist:
            return ""
    getter.short_description = short_description
    getter.boolean = boolean
    return getter

User.profile_login_clipper = FkeyLookup("profile__login_clipper",
                                        "Login clipper")
User.profile_phone = ProfileInfo("phone", "Téléphone")
User.profile_occupation = ProfileInfo("occupation", "Occupation")
User.profile_departement = ProfileInfo("departement", "Departement")
User.profile_mailing_cof = ProfileInfo("mailing_cof", "ML COF", True)
User.profile_mailing_bda = ProfileInfo("mailing_bda", "ML BdA", True)
User.profile_mailing_bda_revente = ProfileInfo("mailing_bda_revente",
                                               "ML BdA-R", True)


class UserProfileAdmin(UserAdmin):
    def is_buro(self, obj):
        try:
            return obj.profile.is_buro
        except CofProfile.DoesNotExist:
            return False
    is_buro.short_description = 'Membre du Buro'
    is_buro.boolean = True

    def is_cof(self, obj):
        try:
            return obj.profile.is_cof
        except CofProfile.DoesNotExist:
            return False
    is_cof.short_description = 'Membre du COF'
    is_cof.boolean = True

    list_display = (
        UserAdmin.list_display
        + ('profile_login_clipper', 'profile_phone', 'profile_occupation',
           'profile_mailing_cof', 'profile_mailing_bda',
           'profile_mailing_bda_revente', 'is_cof', 'is_buro', )
    )
    list_display_links = ('username', 'email', 'first_name', 'last_name')
    list_filter = UserAdmin.list_filter \
        + ('profile__is_cof', 'profile__is_buro', 'profile__mailing_cof',
           'profile__mailing_bda')
    search_fields = UserAdmin.search_fields + ('profile__phone',)
    inlines = [
        CofProfileInline,
    ]

    staff_fieldsets = [
        (None, {'fields': ['username', 'password']}),
        (_('Personal info'), {'fields': ['first_name', 'last_name', 'email']}),
    ]

    def get_fieldsets(self, request, user=None):
        if not request.user.is_superuser:
            return self.staff_fieldsets
        return super().get_fieldsets(request, user)

    def save_model(self, request, user, form, change):
        cof_group, created = Group.objects.get_or_create(name='COF')
        if created:
            # Si le groupe COF n'était pas déjà dans la bdd
            # On lui assigne les bonnes permissions
            perms = Permission.objects.filter(
                Q(content_type__app_label='cof')
                | Q(content_type__app_label='bda')
                | (Q(content_type__app_label='auth')
                   & Q(content_type__model='user')))
            cof_group.permissions = perms
            # On y associe les membres du Burô
            cof_group.user_set = User.objects.filter(profile__is_buro=True)
            # Sauvegarde
            cof_group.save()
        # le Burô est staff et appartient au groupe COF
        if user.profile.is_buro:
            user.is_staff = True
            user.groups.add(cof_group)
        else:
            user.is_staff = False
            user.groups.remove(cof_group)
        user.save()


# FIXME: This is absolutely horrible.
def user_str(self):
    if self.first_name and self.last_name:
        return "{} ({})".format(self.get_full_name(), self.username)
    else:
        return self.username
User.__str__ = user_str


class EventRegistrationAdminForm(forms.ModelForm):
    class Meta:
        widgets = {
            'user': ModelSelect2(url='cof-user-autocomplete'),
        }


class EventRegistrationAdmin(admin.ModelAdmin):
    form = EventRegistrationAdminForm

    list_display = ('__str__', 'event', 'user', 'paid')
    list_filter = ('paid',)
    search_fields = ('user__username', 'user__first_name', 'user__last_name',
                     'user__email', 'event__title')


class PetitCoursAbilityAdmin(admin.ModelAdmin):
    list_display = ('user', 'matiere', 'niveau', 'agrege')
    search_fields = ('user__username', 'user__first_name', 'user__last_name',
                     'user__email', 'matiere__name', 'niveau')
    list_filter = ('matiere', 'niveau', 'agrege')


class PetitCoursAttributionAdmin(admin.ModelAdmin):
    list_display = ('user', 'demande', 'matiere', 'rank', )
    search_fields = ('user__username', 'matiere__name')


class PetitCoursAttributionCounterAdmin(admin.ModelAdmin):
    list_display = ('user', 'matiere', 'count', )
    list_filter = ('matiere',)
    search_fields = ('user__username', 'user__first_name', 'user__last_name',
                     'user__email', 'matiere__name')
    actions = ['reset', ]
    actions_on_bottom = True

    def reset(self, request, queryset):
        queryset.update(count=0)
    reset.short_description = "Remise à zéro du compteur"


class PetitCoursDemandeAdmin(admin.ModelAdmin):
    list_display = ('name', 'email', 'agrege_requis', 'niveau', 'created',
                    'traitee', 'processed')
    list_filter = ('traitee', 'niveau')
    search_fields = ('name', 'email', 'phone', 'lieu', 'remarques')


class ClubAdminForm(forms.ModelForm):
    def clean(self):
        cleaned_data = super().clean()
        respos = cleaned_data.get('respos')
        members = cleaned_data.get('membres')
        for respo in respos.all():
            if respo not in members:
                raise forms.ValidationError(
                    "Erreur : le respo %s n'est pas membre du club."
                    % respo.get_full_name())
        return cleaned_data


class ClubAdmin(admin.ModelAdmin):
    list_display = ['name']
    form = ClubAdminForm


admin.site.register(Survey, SurveyAdmin)
admin.site.register(SurveyQuestion, SurveyQuestionAdmin)
admin.site.register(Event, EventAdmin)
admin.site.register(EventOption, EventOptionAdmin)
admin.site.unregister(User)
admin.site.register(User, UserProfileAdmin)
admin.site.register(CofProfile)
admin.site.register(Club, ClubAdmin)
admin.site.register(PetitCoursSubject)
admin.site.register(PetitCoursAbility, PetitCoursAbilityAdmin)
admin.site.register(PetitCoursAttribution, PetitCoursAttributionAdmin)
admin.site.register(PetitCoursAttributionCounter,
                    PetitCoursAttributionCounterAdmin)
admin.site.register(PetitCoursDemande, PetitCoursDemandeAdmin)
admin.site.register(EventRegistration, EventRegistrationAdmin)