from django.contrib import admin
from django.contrib.contenttypes.admin import GenericTabularInline
from django.contrib.contenttypes.models import ContentType
from django.db.models import Q

from services.models import Service
from .models import Payment


class PaymentMixin:
    def get_fields(self, request, obj=None):
        fields = ('amount', 'period', 'payment_method', 'date',)
        if request.user.is_superuser or request.user.has_perm('banking.validate_payment'):
            fields += ('validated',)
        return fields

    def get_queryset(self, request):
        qs = super().get_queryset(request)
        if request.user.is_superuser or request.user.has_perm('banking.validate_payment'):
            return qs
        # Show only adherent contribution and payment related to a service for which the user is in managment group.
        user_ctype = ContentType.objects.get(app_label='adhesions', model='adherent')
        return qs.filter(Q(reason_type=user_ctype) | Q(service__service_type__group__in=request.user.groups.all()))


class PaymentInlineMixin(PaymentMixin, GenericTabularInline):
    model = Payment
    ct_field = 'reason_type'
    ct_fk_field = 'reason_id'


class ValidatedPaymentInline(PaymentInlineMixin):
    extra = 0
    verbose_name_plural = 'Paiements validés'

    def get_readonly_fields(self, request, obj=None):
        return self.get_fields(request, obj)

    def has_add_permission(self, request):
        return False

    def has_delete_permission(self, request, obj=None):
        return request.user.has_perm('banking.validate_payment')

    def get_queryset(self, request):
        return super().get_queryset(request).filter(validated=True)


class PendingOrNewPaymentInline(PaymentInlineMixin):
    extra = 1
    verbose_name_plural = 'Paiements en attente de validation et nouveaux paiements'

    def get_queryset(self, request):
        return super().get_queryset(request).filter(validated=False)


class PaymentAdmin(PaymentMixin, admin.ModelAdmin):
    list_display = ('reason_verbose', 'amount', 'period', 'payment_method', 'validated',)
    list_filter = ('payment_method', 'validated',)

    def has_change_permission(self, request, obj=None):
        if obj and not request.user.is_superuser:
            return not obj.validated
        return True

    def has_add_permission(self, request):
        return False


admin.site.register(Payment, PaymentAdmin)