coin/coin/billing/admin.py

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.contrib import admin
from django.contrib import messages
from django.http import HttpResponseRedirect
from django.conf.urls import url
from django.contrib.admin.utils import flatten_fieldsets

from coin.filtering_queryset import LimitedAdminInlineMixin
from coin.billing.models import Invoice, InvoiceDetail, Payment, PaymentAllocation
from coin.billing.utils import get_invoice_from_id_or_number
from django.core.urlresolvers import reverse
import autocomplete_light


class InvoiceDetailInline(LimitedAdminInlineMixin, admin.StackedInline):
    model = InvoiceDetail
    extra = 0
    fields = (('label', 'amount', 'quantity', 'tax'),
              ('offersubscription', 'period_from', 'period_to'))

    def get_filters(self, obj):
        """
        Le champ "Abonnement" est filtré afin de n'afficher que les abonnements
        du membre choisi dans la facture. Si pas de membre alors renvoi
        une liste vide
        """
        if obj and obj.member:
            return (('offersubscription', {'member': obj.member}),)
        else:
            return (('offersubscription', None),)

    def get_readonly_fields(self, request, obj=None):
        if not obj or not obj.member:
            return self.readonly_fields + ('offersubscription',)
        return self.readonly_fields


class InvoiceDetailInlineReadOnly(admin.StackedInline):

    """
    Lorsque la facture est validée, il n'est plus possible de la modifier
    Ce inline est donc identique à InvoiceDetailInline, mais tous
    les champs sont en lecture seule
    """
    model = InvoiceDetail
    extra = 0
    fields = InvoiceDetailInline.fields
    can_delete = False

    def has_add_permission(self, request):
        return False

    def get_readonly_fields(self, request, obj=None):
        if self.declared_fieldsets:
            result = flatten_fieldsets(self.declared_fieldsets)
        else:
            result = list(set(
                [field.name for field in self.opts.local_fields] +
                [field.name for field in self.opts.local_many_to_many]
            ))
            result.remove('id')
        return result


class PaymentAllocatedReadOnly(admin.TabularInline):
    model = PaymentAllocation
    extra = 0
    fields = ("payment", "amount")
    readonly_fields = ("payment", "amount")
    verbose_name = None
    verbose_name_plural = "Paiement alloués"

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

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


class PaymentInlineAdd(admin.StackedInline):
    model = Payment
    extra = 0
    fields = (('date', 'payment_mean', 'amount'),)
    can_delete = False

    verbose_name_plural = "Ajouter des paiements"

    def has_change_permission(self, request):
        return False


class InvoiceAdmin(admin.ModelAdmin):
    list_display = ('number', 'date', 'status', 'amount', 'member',
                    'validated')
    list_display_links = ('number', 'date')
    fields = (('number', 'date', 'status'),
              ('date_due'),
              ('member'),
              ('amount', 'amount_paid'),
              ('validated', 'pdf'))
    readonly_fields = ('amount', 'amount_paid', 'validated', 'pdf', 'number')
    form = autocomplete_light.modelform_factory(Invoice, fields='__all__')

    def get_readonly_fields(self, request, obj=None):
        """
        Si la facture est validée, passe tous les champs en readonly
        """
        if obj and obj.validated:
            if self.declared_fieldsets:
                return flatten_fieldsets(self.declared_fieldsets)
            else:
                return list(set(
                    [field.name for field in self.opts.local_fields] +
                    [field.name for field in self.opts.local_many_to_many]
                ))
        return self.readonly_fields

    def get_inline_instances(self, request, obj=None):
        """
        Renvoi les inlines selon le context :
        * Si création, alors ne renvoi aucun inline
        * Si modification, renvoi InvoiceDetail et PaymentInline
        * Si facture validée, renvoi InvoiceDetail en ReadOnly et PaymentInline
        """
        inlines = []
        inline_instances = []

        if obj is not None:
            if obj.validated:
                inlines = [InvoiceDetailInlineReadOnly]
            else:
                inlines = [InvoiceDetailInline]

            if obj.validated:
                inlines += [PaymentAllocatedReadOnly]
                if obj.status == "open":
                    inlines += [PaymentInlineAdd]

        for inline_class in inlines:
            inline = inline_class(self.model, self.admin_site)

            if request:
                if not (inline.has_add_permission(request) or
                        inline.has_change_permission(request) or
                        inline.has_delete_permission(request)):
                    continue
                if not inline.has_add_permission(request):
                    inline.max_num = 0
            inline_instances.append(inline)

        return inline_instances

    def get_urls(self):
        """
        Custom admin urls
        """
        urls = super(InvoiceAdmin, self).get_urls()
        my_urls = [
            url(r'^validate/(?P<id>.+)$',
                self.admin_site.admin_view(self.validate_view),
                name='invoice_validate'),
        ]
        return my_urls + urls

    def validate_view(self, request, id):
        """
        Vue appelée lorsque l'admin souhaite valider une facture et
        générer son pdf
        """

        # TODO : Add better perm here
        if request.user.is_superuser:
            invoice = get_invoice_from_id_or_number(id)
            if invoice.amount() == 0:
                messages.error(request, 'Une facture validée ne peut pas avoir'
                                        ' un total de 0€.')
            else:
                invoice.validate()
                messages.success(request, 'La facture a été validée.')
        else:
            messages.error(
                request, 'Vous n\'avez pas l\'autorisation de valider '
                         'une facture.')

        return HttpResponseRedirect(reverse('admin:billing_invoice_change',
                                            args=(id,)))


class PaymentAllocationInlineReadOnly(admin.TabularInline):
    model = PaymentAllocation
    extra = 0
    fields = ("invoice", "amount")
    readonly_fields = ("invoice", "amount")
    verbose_name = None
    verbose_name_plural = "Alloué à"

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

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


class PaymentAdmin(admin.ModelAdmin):

    list_display = ('__unicode__', 'member', 'payment_mean', 'amount', 'date',
                    'amount_already_allocated', 'label')
    list_display_links = ()
    fields = (('member'),
              ('amount', 'payment_mean', 'date', 'label'),
              ('amount_already_allocated'))
    readonly_fields = ('amount_already_allocated', 'label')
    form = autocomplete_light.modelform_factory(Payment, fields='__all__')

    def get_readonly_fields(self, request, obj=None):

        # If payment already started to be allocated or already have a member
        if obj and (obj.amount_already_allocated != 0 or obj.member != None):
            # All fields are readonly
            return flatten_fieldsets(self.declared_fieldsets)
        else:
            return self.readonly_fields

    def get_inline_instances(self, request, obj=None):
        return [PaymentAllocationInlineReadOnly(self.model, self.admin_site)]

admin.site.register(Invoice, InvoiceAdmin)
admin.site.register(Payment, PaymentAdmin)