from django.contrib import admin
from django.contrib.contenttypes.admin import GenericStackedInline, GenericTabularInline
from django.db.models import Q
from django.contrib.contenttypes.models import ContentType
from django.contrib.auth.models import User as AuthUser, Group
from django.contrib.auth.admin import UserAdmin as AuthUserAdmin
from django.http import HttpResponseRedirect

from .forms import AdhesionForm, UserCreationForm
from .models import User, Corporation, Adhesion
from accounts.models import Profile
from services.models import Service
from banking.admin import PaymentInline


class AdhesionInline(GenericTabularInline):
    model = Adhesion
    ct_field = 'adherent_type'
    ct_fk_field = 'adherent_id'
    form = AdhesionForm
    min_num = 1
    max_num = 1
    extra = 0
    show_change_link = True

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


class ProfileInline(admin.StackedInline):
    model = Profile

    def has_add_permission(self, request):
        return False

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


class ServiceInline(admin.StackedInline):
    model = Service
    extra = 0
    show_change_link = True
    fields = ('service_type', 'label',)
    readonly_fields = ('service_type', 'label',)

    def has_add_permission(self, request):
        return False

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


class UserIsAdherentFilter(admin.SimpleListFilter):
    title = 'status adhérent'
    parameter_name = 'adherent'

    def lookups(self, request, model_admin):
        return (
            ('1', 'Oui'),
            ('0', 'Non'),
        )

    def queryset(self, request, queryset):
        adhesion_list = Adhesion.objects.values_list('adherent_id')
        if self.value() == '0':
            return queryset.exclude(pk__in=adhesion_list)
        if self.value() == '1':
            return queryset.filter(pk__in=adhesion_list)


class UserAdmin(AuthUserAdmin):
    list_display = AuthUserAdmin.list_display + ('adherent_id',)
    list_filter = (AuthUserAdmin.list_filter[2], UserIsAdherentFilter) # [2] = actif

    def adherent_id(self, user):
        adherent = user.adhesion
        if adherent:
            return adherent.id
    adherent_id.short_description = 'Numéro d’adhérent'

    def get_form(self, request, obj=None, **kwargs):
        if obj:
            UserAdmin.inlines = (ProfileInline, AdhesionInline,)
            return super().get_form(request, obj, **kwargs)
        else:
            UserAdmin.inlines = (AdhesionInline,)
            return UserCreationForm

    def get_fieldsets(self, request, obj=None):
        if obj:
            return (
                AuthUserAdmin.fieldsets[0],
                AuthUserAdmin.fieldsets[1],
                (AuthUserAdmin.fieldsets[2][0], {
                    'classes': ('collapse',),
                    'fields': ('is_active', 'is_staff', 'is_superuser',), # removing groups and user_permissions
                }),
                (AuthUserAdmin.fieldsets[3][0], {
                    'classes': ('collapse',),
                    'fields': AuthUserAdmin.fieldsets[3][1]['fields'],
                }),
            )
        else:
            return (
                (None, {
                    'fields': ('first_name', 'last_name', 'username',),
                }),
            )

    def get_actions(self, request):
        actions = super().get_actions(request)
        if 'delete_selected' in actions:
            del actions['delete_selected']
        return actions

    def has_delete_permission(self, request, obj=None):
        return obj and not obj.adhesion


class AdherentTypeFilter(admin.SimpleListFilter):
    title = 'type d’adhérent'
    parameter_name = 'type'

    def lookups(self, request, model_admin):
        return (
            ('physique', 'Personne physique'),
            ('morale', 'Personne morale'),
        )

    def queryset(self, request, queryset):
        if self.value() == 'physique':
            return queryset.filter(adherent_type__app_label='auth',
                                   adherent_type__model='user')
        if self.value() == 'morale':
            return queryset.filter(adherent_type__app_label='adhesions',
                                   adherent_type__model='corporation')


class AdhesionAdmin(admin.ModelAdmin):
    list_display = ('get_id', 'get_adherent_link', 'type',)
    list_filter = (AdherentTypeFilter,)
    fields = ('id', 'type', 'get_adherent_link',)
    readonly_fields = ('id', 'type', 'get_adherent_link',)
    search_fields = ('id',)
    inlines = (ServiceInline,)#PaymentInline,)

    def get_id(self, obj):
        return 'ADT%d' % obj.id
    get_id.short_description = 'Numéro d’adhérent'

    def get_search_results(self, request, queryset, search_term):
        queryset, use_distinct = super().get_search_results(request, queryset, search_term)
        users = User.objects.filter(
                    Q(username__icontains=search_term)
                    | Q(first_name__icontains=search_term)
                    | Q(last_name__icontains=search_term)
        )
        user_type = ContentType.objects.get_for_model(User)
        queryset |= Adhesion.objects.filter(adherent_type=user_type,
                                            adherent_id__in=users.values_list('pk'))
        corporations = Corporation.objects.filter(social_reason__icontains=search_term)
        corporation_type = ContentType.objects.get_for_model(Corporation)
        queryset |= Adhesion.objects.filter(adherent_type=corporation_type,
                                            adherent_id__in=corporations.values_list('pk'))
        return queryset, use_distinct

    def get_actions(self, request):
        actions = super().get_actions(request)
        if 'delete_selected' in actions:
            del actions['delete_selected']
        return actions

    def has_add_permission(self, request):
        return False

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


class CorporationAdmin(admin.ModelAdmin):
    list_display = ('social_reason', 'adherent_id')
    inlines = (AdhesionInline,)
    search_fields = ('social_reason',)
    filter_horizontal = ('members',)

    def adherent_id(self, corporation):
        adherent = corporation.adhesion
        if adherent:
            return adherent.id
    adherent_id.short_description = 'Numéro d’adhérent'

    def get_actions(self, request):
        actions = super().get_actions(request)
        if 'delete_selected' in actions:
            del actions['delete_selected']
        return actions

    def has_delete_permission(self, request, obj=None):
        return obj and not obj.adhesion


admin.site.unregister(AuthUser)
admin.site.unregister(Group)
admin.site.register(User, UserAdmin)
admin.site.register(Corporation, CorporationAdmin)
admin.site.register(Adhesion, AdhesionAdmin)