Finished billing prototype

orchestra/apps/bills/actions.py

@@ -6,7 +6,7 @@ from orchestra.utils.system import run
 def generate_bill(modeladmin, request, queryset):
     bill = queryset.get()
     bill.close()
-#    return HttpResponse(bill.html)
+    return HttpResponse(bill.html)
     pdf = run('xvfb-run -a -s "-screen 0 640x4800x16" '
         'wkhtmltopdf --footer-center "Page [page] of [topage]" --footer-font-size 9 - -',
         stdin=bill.html.encode('utf-8'), display=False)

orchestra/apps/bills/admin.py

@@ -1,12 +1,14 @@
 from django import forms
 from django.contrib import admin
 from django.core.urlresolvers import reverse
+from django.db import models
 from django.utils.translation import ugettext_lazy as _
 
 from orchestra.admin import ExtendedModelAdmin
 from orchestra.admin.utils import admin_link, admin_date
 from orchestra.apps.accounts.admin import AccountAdminMixin
 
+from . import settings
 from .actions import generate_bill
 from .filters import BillTypeListFilter
 from .models import (Bill, Invoice, AmendmentInvoice, Fee, AmendmentFee, Budget,
@@ -15,9 +17,16 @@ from .models import (Bill, Invoice, AmendmentInvoice, Fee, AmendmentFee, Budget,
 
 class BillLineInline(admin.TabularInline):
     model = BillLine
-    fields = (
+    fields = ('description', 'rate', 'amount', 'tax', 'total', 'subtotal')
-        'description', 'initial_date', 'final_date', 'price', 'amount', 'tax'
+    readonly_fields = ('subtotal',)
-    )
+    
+    def subtotal(self, line):
+        if line.total:
+            subtotal = 0
+            for subline in line.sublines.all():
+                subtotal += subline.total
+            return line.total - subtotal
+        return ''
     
     def get_readonly_fields(self, request, obj=None):
         if obj and obj.status != Bill.OPEN:
@@ -37,21 +46,20 @@ class BillLineInline(admin.TabularInline):
 
 class BudgetLineInline(admin.TabularInline):
     model = Budget
-    fields = (
+    fields = ('description', 'rate', 'amount', 'tax', 'total')
-        'description', 'initial_date', 'final_date', 'price', 'amount', 'tax'
-    )
 
 
 class BillAdmin(AccountAdminMixin, ExtendedModelAdmin):
     list_display = (
-        'number', 'status', 'type_link', 'account_link', 'created_on_display'
+        'number', 'status', 'type_link', 'account_link', 'created_on_display',
+        'num_lines', 'display_total'
     )
     list_filter = (BillTypeListFilter, 'status',)
     add_fields = ('account', 'type', 'status', 'due_on', 'comments')
     fieldsets = (
         (None, {
-            'fields': ('number', 'account_link', 'type', 'status', 'due_on',
+            'fields': ('number', 'display_total', 'account_link', 'type',
-                       'comments'),
+                       'status', 'due_on', 'comments'),
         }),
         (_("Raw"), {
             'classes': ('collapse',),
@@ -60,11 +68,21 @@ class BillAdmin(AccountAdminMixin, ExtendedModelAdmin):
     )
     change_view_actions = [generate_bill]
     change_readonly_fields = ('account_link', 'type', 'status')
-    readonly_fields = ('number',)
+    readonly_fields = ('number', 'display_total')
     inlines = [BillLineInline]
     
     created_on_display = admin_date('created_on')
     
+    def num_lines(self, bill):
+        return bill.billlines__count
+    num_lines.admin_order_field = 'billlines__count'
+    num_lines.short_description = _("lines")
+    
+    def display_total(self, bill):
+        return "%i &%s;" % (bill.get_total(), settings.BILLS_CURRENCY.lower())
+    display_total.allow_tags = True
+    display_total.short_description = _("total")
+    
     def type_link(self, bill):
         bill_type = bill.type.lower()
         url = reverse('admin:bills_%s_changelist' % bill_type)
@@ -94,6 +112,12 @@ class BillAdmin(AccountAdminMixin, ExtendedModelAdmin):
             kwargs['widget'] = forms.Textarea(attrs={'cols': 150, 'rows': 20})
         return super(BillAdmin, self).formfield_for_dbfield(db_field, **kwargs)
         
+    def queryset(self, request):
+        qs = super(BillAdmin, self).queryset(request)
+        qs = qs.annotate(models.Count('billlines'))
+        qs = qs.prefetch_related('billlines', 'billlines__sublines')
+        return qs
+
 
 admin.site.register(Bill, BillAdmin)
 admin.site.register(Invoice, BillAdmin)

orchestra/apps/bills/models.py

@@ -8,6 +8,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from orchestra.apps.accounts.models import Account
 from orchestra.core import accounts
+from orchestra.utils.functional import cached
 
 from . import settings
 
@@ -141,6 +142,25 @@ class Bill(models.Model):
             self.set_number()
         super(Bill, self).save(*args, **kwargs)
     
+    @cached
+    def get_subtotals(self):
+        subtotals = {}
+        for line in self.lines.all():
+            subtotal, taxes = subtotals.get(line.tax, (0, 0))
+            subtotal += line.total
+            for subline in line.sublines.all():
+                subtotal += subline.total
+            subtotals[line.tax] = (subtotal, (line.tax/100)*subtotal)
+        return subtotals
+    
+    @cached
+    def get_total(self):
+        total = 0
+        for tax, subtotal in self.get_subtotals().iteritems():
+            subtotal, taxes = subtotal
+            total += subtotal + taxes
+        return total
+
 
 class Invoice(Bill):
     class Meta:
@@ -176,11 +196,11 @@ class BaseBillLine(models.Model):
     bill = models.ForeignKey(Bill, verbose_name=_("bill"),
             related_name='%(class)ss')
     description = models.CharField(_("description"), max_length=256)
-    initial_date = models.DateTimeField()
+    rate = models.DecimalField(_("rate"), blank=True, null=True,
-    final_date = models.DateTimeField()
+            max_digits=12, decimal_places=2)
-    price = models.DecimalField(max_digits=12, decimal_places=2)
     amount = models.DecimalField(_("amount"), max_digits=12, decimal_places=2)
-    tax = models.DecimalField(_("tax"), max_digits=12, decimal_places=2)
+    total = models.DecimalField(_("total"), max_digits=12, decimal_places=2)
+    tax = models.PositiveIntegerField(_("tax"))
     
     class Meta:
         abstract = True
@@ -188,7 +208,7 @@ class BaseBillLine(models.Model):
     def __unicode__(self):
         return "#%i" % self.number
     
-    @property
+    @cached_property
     def number(self):
         lines = type(self).objects.filter(bill=self.bill_id)
         return lines.filter(id__lte=self.id).order_by('id').count()
@@ -207,7 +227,7 @@ class BillLine(BaseBillLine):
             related_name='amendment_lines', null=True, blank=True)
 
 
-class SubBillLine(models.Model):
+class BillSubline(models.Model):
     """ Subline used for describing an item discount """
     bill_line = models.ForeignKey(BillLine, verbose_name=_("bill line"),
             related_name='sublines')

orchestra/apps/bills/templates/bills/microspective.html

@@ -50,7 +50,7 @@
     </div>
     <div id="total">
         <span class="title">TOTAL</span><br>
-        <psan class="value">{{ bill.total }} &{{ currency.lower }};</span>
+        <psan class="value">{{ bill.get_total }} &{{ currency.lower }};</span>
     </div>
     <div id="bill-date">
         <span class="title">{{ bill.get_type_display.upper }} DATE</span><br>
@@ -79,20 +79,22 @@
     <span class="value column-description">{{ line.description }}</span>
     <span class="value column-quantity">{{ line.amount|default:"&nbsp;" }}</span>
     <span class="value column-rate">{% if line.rate %}{{ line.rate }} &{{ currency.lower }};{% else %}&nbsp;{% endif %}</span>
-    <span class="value column-subtotal">{{ line.price }} &{{ currency.lower }};</span>
+    <span class="value column-subtotal">{{ line.total }} &{{ currency.lower }};</span>
     <br>
     {% endfor %}
 </div>
 <div id="totals">
     <br>&nbsp;<br>
-    <span class="subtotal column-title">subtotal</span>
+    {% for tax, subtotal in bill.get_subtotals.iteritems %}
-    <span class="subtotal column-value">{{ bill.subtotal }} &{{ currency.lower }};</span>
+        <span class="subtotal column-title">subtotal {{ tax }}% VAT</span>
+        <span class="subtotal column-value">{{ subtotal | first }} &{{ currency.lower }};</span>
         <br>
-    <span class="tax column-title">tax</span>
+        <span class="tax column-title">taxes {{ tax }}% VAT</span>
-    <span class="tax column-value">{{ bill.taxes }} &{{ currency.lower }};</span>
+        <span class="tax column-value">{{ subtotal | last }} &{{ currency.lower }};</span>
         <br>
+    {% endfor %}
     <span class="total column-title">total</span>
-    <span class="total column-value">{{ bill.total }} &{{ currency.lower }};</span>
+    <span class="total column-value">{{ bill.get_total }} &{{ currency.lower }};</span>
     <br>
 </div>
 {% endblock %}

orchestra/apps/contacts/admin.py

@@ -97,7 +97,7 @@ class ContactInline(InvoiceContactInline):
 
 def has_invoice(account):
     try:
-        account.invoicecontact.get()
+        account.invoicecontact
     except InvoiceContact.DoesNotExist:
         return False
     return True

orchestra/apps/orders/actions.py

@@ -70,7 +70,7 @@ class BillSelectedOrders(object):
                 msg = _("Selected orders do not have pending billing")
                 self.modeladmin.message_user(request, msg, messages.WARNING)
             else:
-                ids = ','.join([bill.id for bill in bills])
+                ids = ','.join([str(bill.id) for bill in bills])
                 url = reverse('admin:bills_bill_changelist')
                 context = {
                     'url': url + '?id=%s' % ids,

orchestra/apps/orders/admin.py

@@ -78,9 +78,9 @@ class ServiceAdmin(admin.ModelAdmin):
 class OrderAdmin(AccountAdminMixin, ChangeListDefaultFilter, admin.ModelAdmin):
     list_display = (
         'id', 'service', 'account_link', 'content_object_link',
-        'display_registered_on', 'display_cancelled_on'
+        'display_registered_on', 'display_billed_until', 'display_cancelled_on'
     )
-    list_display_link = ('id', 'service')
+    list_display_links = ('id', 'service')
     list_filter = (ActiveOrderListFilter, 'service',)
     actions = (BillSelectedOrders(),)
     date_hierarchy = 'registered_on'
@@ -90,6 +90,7 @@ class OrderAdmin(AccountAdminMixin, ChangeListDefaultFilter, admin.ModelAdmin):
     
     content_object_link = admin_link('content_object', order=False)
     display_registered_on = admin_date('registered_on')
+    display_billed_until = admin_date('billed_until')
     display_cancelled_on = admin_date('cancelled_on')
     
     def get_queryset(self, request):

orchestra/apps/orders/backends.py

@@ -0,0 +1,42 @@
+import datetime
+
+from orchestra.apps.bills.models import Invoice, Fee, BillLine, BillSubline
+
+
+class BillsBackend(object):
+    def create_bills(self, account, lines):
+        invoice = None
+        fees = []
+        for order, nominal_price, size, ini, end, discounts in lines:
+            service = order.service
+            if service.is_fee:
+                fee = Fee.objects.get_or_create(account=account, status=Fee.OPEN)
+                line = fee.lines.create(rate=service.nominal_price, amount=size,
+                        total=nominal_price, tax=0)
+                self.create_sublines(line, discounts)
+                fees.append(fee)
+            else:
+                if invoice is None:
+                    invoice, __ = Invoice.objects.get_or_create(account=account,
+                            status=Invoice.OPEN)
+                description = order.description 
+                if service.billing_period != service.NEVER:
+                    description += " {ini} to {end}".format(
+                        ini=ini.strftime("%b, %Y"),
+                        end=(end-datetime.timedelta(seconds=1)).strftime("%b, %Y"))
+                line = invoice.lines.create(
+                    description=description,
+                    rate=service.nominal_price,
+                    amount=size,
+                    total=nominal_price,
+                    tax=service.tax,
+                )
+                self.create_sublines(line, discounts)
+        return [invoice] + fees
+    
+    def create_sublines(self, line, discounts):
+        for name, value in discounts:
+            line.sublines.create(
+                description=_("Discount per %s") % name,
+                total=value,
+            )

orchestra/apps/orders/handlers.py

@@ -1,6 +1,7 @@
 import calendar
+import datetime
 
-from dateutil.relativedelta import relativedelta
+from dateutil import relativedelta
 from django.contrib.contenttypes.models import ContentType
 from django.db.models import Q
 from django.utils import timezone
@@ -8,6 +9,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from orchestra.utils import plugins
 
+from . import settings
 from .helpers import get_register_or_cancel_events, get_register_or_renew_events
 
 
@@ -52,55 +54,59 @@ class ServiceHandler(plugins.Plugin):
             return eval(self.metric, safe_locals)
     
     def get_billing_point(self, order, bp=None, **options):
-        not_cachable = self.billing_point is self.FIXED_DATE and options.get('fixed_point')
+        not_cachable = self.billing_point == self.FIXED_DATE and options.get('fixed_point')
         if not_cachable or bp is None:
             bp = options.get('billing_point', timezone.now().date())
             if not options.get('fixed_point'):
-                if self.billing_period is self.MONTHLY:
+                msg = ("Support for '%s' period and '%s' point is not implemented"
+                    % (self.get_billing_period_display(), self.get_billing_point_display()))
+                if self.billing_period == self.MONTHLY:
                     date = bp
-                    if self.payment_style is self.PREPAY:
+                    if self.payment_style == self.PREPAY:
-                        date += relativedelta(months=1)
+                        date += relativedelta.relativedelta(months=1)
-                    if self.billing_point is self.ON_REGISTER:
+                    if self.billing_point == self.ON_REGISTER:
                         day = order.registered_on.day
-                    elif self.billing_point is self.FIXED_DATE:
+                    elif self.billing_point == self.FIXED_DATE:
                         day = 1
+                    else:
+                        raise NotImplementedError(msg)
                     bp = datetime.datetime(year=date.year, month=date.month,
                             day=day, tzinfo=timezone.get_current_timezone())
-                elif self.billing_period is self.ANUAL:
+                elif self.billing_period == self.ANUAL:
-                    if self.billing_point is self.ON_REGISTER:
+                    if self.billing_point == self.ON_REGISTER:
                         month = order.registered_on.month
                         day = order.registered_on.day
-                    elif self.billing_point is self.FIXED_DATE:
+                    elif self.billing_point == self.FIXED_DATE:
                         month = settings.ORDERS_SERVICE_ANUAL_BILLING_MONTH
                         day = 1
+                    else:
+                        raise NotImplementedError(msg)
                     year = bp.year
-                    if self.payment_style is self.POSTPAY:
+                    if self.payment_style == self.POSTPAY:
-                        year = bo.year - relativedelta(years=1)
+                        year = bo.year - relativedelta.relativedelta(years=1)
                     if bp.month >= month:
                         year = bp.year + 1
                     bp = datetime.datetime(year=year, month=month, day=day,
                         tzinfo=timezone.get_current_timezone())
-                elif self.billing_period is self.NEVER:
+                elif self.billing_period == self.NEVER:
                     bp = order.registered_on
                 else:
-                    raise NotImplementedError(
+                    raise NotImplementedError(msg)
-                        "Support for '%s' billing period and '%s' billing point is not implemented"
+        if self.on_cancel != self.NOTHING and order.cancelled_on and order.cancelled_on < bp:
-                        % (self.display_billing_period(), self.display_billing_point())
-                    )
-        if self.on_cancel is not self.NOTHING and order.cancelled_on < bp:
             return order.cancelled_on
         return bp
     
     def get_pricing_size(self, ini, end):
         rdelta = relativedelta.relativedelta(end, ini)
-        if self.get_pricing_period() is self.MONTHLY:
+        if self.get_pricing_period() == self.MONTHLY:
             size = rdelta.months
-            days = calendar.monthrange(bp.year, bp.month)[1]
+            days = calendar.monthrange(end.year, end.month)[1]
-            size += float(bp.day)/days
+            size += float(rdelta.days)/days
-        elif self.get_pricint_period() is self.ANUAL:
+        elif self.get_pricing_period() == self.ANUAL:
             size = rdelta.years
-            size += float(rdelta.days)/365
+            days = 366 if calendar.isleap(end.year) else 365
-        elif self.get_pricing_period() is self.NEVER:
+            size += float((end-ini).days)/days
+        elif self.get_pricing_period() == self.NEVER:
             size = 1
         else:
             raise NotImplementedError
@@ -108,11 +114,11 @@ class ServiceHandler(plugins.Plugin):
     
     def get_pricing_slots(self, ini, end):
         period = self.get_pricing_period()
-        if period is self.MONTHLY:
+        if period == self.MONTHLY:
-            rdelta = relativedelta(months=1)
+            rdelta = relativedelta.relativedelta(months=1)
-        elif period is self.ANUAL:
+        elif period == self.ANUAL:
-            rdelta = relativedelta(years=1)
+            rdelta = relativedelta.relativedelta(years=1)
-        elif period is self.NEVER:
+        elif period == self.NEVER:
             yield ini, end
             raise StopIteration
         else:
@@ -125,51 +131,107 @@ class ServiceHandler(plugins.Plugin):
             yield ini, next
             ini = next
     
-    def create_line(self, order, price, size):
+    def get_price_with_orders(self, order, size, ini, end):
+        porders = self.orders.filter(account=order.account).filter(
+            Q(cancelled_on__isnull=True) | Q(cancelled_on__gt=ini)
+            ).filter(registered_on__lt=end)
+        price = 0
+        if self.orders_effect == self.REGISTER_OR_RENEW:
+            events = get_register_or_renew_events(porders, ini, end)
+        elif self.orders_effect == self.CONCURRENT:
+            events = get_register_or_cancel_events(porders, ini, end)
+        else:
+            raise NotImplementedError
+        for metric, ratio in events:
+            price += self.get_rate(order, metric) * size * ratio
+        return price
+    
+    def get_price_with_metric(self, order, size, ini, end):
+        metric = order.get_metric(ini, end)
+        price = self.get_rate(order, metric) * size
+        return price
+    
+    def create_line(self, order, price, size, ini, end):
         nominal_price = self.nominal_price * size
+        discounts = []
         if nominal_price > price:
-            discount = nominal_price-price
+            discounts.append(('volume', nominal_price-price))
+        # TODO Uncomment when prices are done
+#        elif nominal_price < price:
+#            raise ValueError("Something is wrong!")
+        return (order, nominal_price, size, ini, end, discounts)
     
     def create_bill_lines(self, orders, **options):
-        # Perform compensations on cancelled services
+        # For the "boundary conditions" just think that:
-        # TODO WTF to do with day 1 of each month.
+        #   date(2011, 1, 1) is equivalent to datetime(2011, 1, 1, 0, 0, 0)
-        if self.on_cancel in (Order.COMPENSATE, Order.REFOUND):
+        #   In most cases:
+        #       ini >= registered_date, end < registered_date
+        
+        # TODO Perform compensations on cancelled services
+        if self.on_cancel in (self.COMPENSATE, self.REFOUND):
+            pass
             # TODO compensations with commit=False, fuck commit or just fuck the transaction?
-            compensate(orders, **options)
+            # compensate(orders, **options)
             # TODO create discount per compensation
         bp = None
         lines = []
         for order in orders:
             bp = self.get_billing_point(order, bp=bp, **options)
             ini = order.billed_until or order.registered_on
-            if bp < ini:
+            if bp <= ini:
                 continue
             if not self.metric:
                 # Number of orders metric; bill line per order
-                porders = service.orders.filter(account=order.account).filter(
-                    Q(is_active=True) | Q(cancelled_on__gt=order.billed_until)
-                    ).filter(registered_on__lt=bp)
-                price = 0
                 size = self.get_pricing_size(ini, bp)
-                if self.orders_effect is self.REGISTER_OR_RENEW:
+                price = self.get_price_with_orders(order, size, ini, bp)
-                    events = get_register_or_renew_events(porders, ini, bp)
+                lines.append(self.create_line(order, price, size, ini, bp))
-                elif self.orders_effect is self.CONCURRENT:
-                    events = get_register_or_cancel_events(porders, ini, bp)
-                else:
-                    raise NotImplementedError
-                for metric, ratio in events:
-                    price += self.get_rate(metric, account) * size * ratio
-                lines += self.create_line(order, price, size)
             else:
                 # weighted metric; bill line per pricing period
                 for ini, end in self.get_pricing_slots(ini, bp):
-                    metric = order.get_metric(ini, end)
                     size = self.get_pricing_size(ini, end)
-                    price = self.get_rate(metric, account) * size
+                    price = self.get_price_with_metric(order, size, ini, end)
-                    lines += self.create_line(order, price, size)
+                    lines.append(self.create_line(order, price, size, ini, end))
+            order.billed_until = bp
+            order.save() # TODO if commit
         return lines
     
     def compensate(self, orders):
-        # num orders and weights
+        # TODO this compensation is a bit hard to write it propertly
-        # Discounts
+        #      don't forget to think about weighted and num order prices.
-        pass
+        # Greedy algorithm for maximizing discount (non-deterministic)
+        # Reduce and break orders in donors and receivers
+        donors = []
+        receivers = []
+        for order in orders:
+            if order.cancelled_on and order.billed_until > order.cancelled_on:
+                donors.append(order)
+            elif not order.cancelled_on or order.cancelled_on > order.billed_until:
+                receivers.append(order)
+        
+        # Assign weights to every donor-receiver combination
+        weights = []
+        for donor in donors:
+            for receiver in receivers:
+                if receiver.cancelled_on:
+                    if not receiver.cancelled_on or receiver.cancelled_on < donor.billed_until:
+                        end = receiver.cancelled_on
+                    else:
+                        end = donor.billed_until
+                else:
+                    end = donor.billed_until
+                ini = donor.billed_until or donor.registered_on
+                if donor.cancelled_on > ini:
+                    ini = donor.cancelled_on
+                weight = (end-ini).days
+                weights.append((weight, ini, end, donor, receiver))
+        
+        # Choose weightest pairs
+        choosen = []
+        weights.sort(key=lambda n: n[0])
+        for weight, ini, end, donor, receiver in weigths:
+            if donor not in choosen and receiver not in choosen:
+                choosen += [donor, receiver]
+                donor.billed_until = end
+                donor.save()
+                price = self.get_price()#TODO
+                receiver.__discount_per_compensation =None

orchestra/apps/orders/helpers.py

@@ -37,7 +37,7 @@ def get_related_objects(origin, max_depth=2):
                 queue.append(new_models)
 
 def get_register_or_cancel_events(porders, ini, end):
-    assert ini > end, "ini > end"
+    assert ini <= end, "ini > end"
     CANCEL = 'cancel'
     REGISTER = 'register'
     changes = {}
@@ -50,21 +50,22 @@ def get_register_or_cancel_events(porders, ini, end):
             if cancel > ini and cancel < end:
                 changes.setdefault(cancel, [])
                 changes[cancel].append(CANCEL)
-        if order.registered_on < ini:
+        if order.registered_on <= ini:
             counter += 1
         elif order.registered_on < end:
             changes.setdefault(order.registered_on, [])
             changes[order.registered_on].append(REGISTER)
     pointer = ini
     total = float((end-ini).days)
-    for date in changes.keys().sort():
+    for date in sorted(changes.keys()):
+        yield counter, (date-pointer).days/total
         for change in changes[date]:
             if change is CANCEL:
                 counter -= 1
             else:
                 counter += 1
-        yield counter, (date-pointer).days/total
         pointer = date
+    yield counter, (end-pointer).days/total
 
 
 def get_register_or_renew_events(handler, porders, ini, end):
@@ -72,7 +73,7 @@ def get_register_or_renew_events(handler, porders, ini, end):
     for sini, send in handler.get_pricing_slots(ini, end):
         counter = 0
         for order in porders:
-            if order.registered_on > sini and order.registered_on < send:
+            if order.registered_on >= sini and order.registered_on < send:
                 counter += 1
             elif order.billed_until > send or order.cancelled_on > send:
                 counter += 1

orchestra/apps/orders/models.py

@@ -84,7 +84,7 @@ class Service(models.Model):
     metric = models.CharField(_("metric"), max_length=256, blank=True,
             help_text=_("Metric used to compute the pricing rate. "
                         "Number of orders is used when left blank."))
-    tax = models.IntegerField(_("tax"), choices=settings.ORDERS_SERVICE_TAXES,
+    tax = models.PositiveIntegerField(_("tax"), choices=settings.ORDERS_SERVICE_TAXES,
             default=settings.ORDERS_SERVICE_DEFAUL_TAX)
     pricing_period = models.CharField(_("pricing period"), max_length=16,
             help_text=_("Period used for calculating the metric used on the "
@@ -163,6 +163,11 @@ class Service(models.Model):
             ),
             default=NEVER)
     
+    @property
+    def nominal_price(self):
+        # FIXME delete and make it a model field
+        return 10
+    
     def __unicode__(self):
         return self.description
     
@@ -215,24 +220,29 @@ class Service(models.Model):
                 msg = "{0} {1}: {2}".format(attr, name, message)
                 raise ValidationError(msg)
     
-    def get_nominal_price(self, order):
+    def get_pricing_period(self):
-        """ returns the price of an item """
+        if self.pricing_period == self.BILLING_PERIOD:
+            return self.billing_period
+        return self.pricing_period
     
-    
+    def get_rate(self, order, metric):
-    def get_price(self, order, amount='TODO'):
+        # TODO implement
-        pass
+        return 12
 
 
 class OrderQuerySet(models.QuerySet):
     group_by = queryset.group_by
     
     def bill(self, **options):
-        for account, services in self.group_by('account_id', 'service_id'):
+        bills = []
+        bill_backend = Order.get_bill_backend()
+        for account, services in self.group_by('account', 'service'):
             bill_lines = []
             for service, orders in services:
-                lines = helpers.create_bill_lines(service, orders, **options)
+                lines = service.handler.create_bill_lines(orders, **options)
                 bill_lines.extend(lines)
-            helpers.create_bills(account, bill_lines)
+            bills += bill_backend.create_bills(account, bill_lines)
+        return bills
     
     def get_related(self):
         pass
@@ -259,10 +269,10 @@ class Order(models.Model):
     object_id = models.PositiveIntegerField(null=True)
     service = models.ForeignKey(Service, verbose_name=_("service"),
             related_name='orders')
-    registered_on = models.DateTimeField(_("registered on"), auto_now_add=True)
+    registered_on = models.DateField(_("registered on"), auto_now_add=True)
-    cancelled_on = models.DateTimeField(_("cancelled on"), null=True, blank=True)
+    cancelled_on = models.DateField(_("cancelled on"), null=True, blank=True)
-    billed_on = models.DateTimeField(_("billed on"), null=True, blank=True)
+    billed_on = models.DateField(_("billed on"), null=True, blank=True)
-    billed_until = models.DateTimeField(_("billed until"), null=True, blank=True)
+    billed_until = models.DateField(_("billed until"), null=True, blank=True)
     ignore = models.BooleanField(_("ignore"), default=False)
     description = models.TextField(_("description"), blank=True)
     
@@ -302,16 +312,26 @@ class Order(models.Model):
             elif orders:
                 orders.get().cancel()
     
+    @classmethod
+    def get_bill_backend(cls):
+        # TODO
+        from .backends import BillsBackend
+        return BillsBackend()
+    
     def cancel(self):
         self.cancelled_on = timezone.now()
         self.save()
     
+    def get_metric(self, ini, end):
+        # TODO implement
+        return 10
+
 
 class MetricStorage(models.Model):
     order = models.ForeignKey(Order, verbose_name=_("order"))
     value = models.BigIntegerField(_("value"))
-    created_on = models.DateTimeField(_("created on"), auto_now_add=True)
+    created_on = models.DateField(_("created on"), auto_now_add=True)
-    updated_on = models.DateTimeField(_("updated on"), auto_now=True)
+    updated_on = models.DateField(_("updated on"), auto_now=True)
     
     class Meta:
         get_latest_by = 'created_on'

orchestra/bin/orchestra-admin

@@ -131,7 +131,7 @@ function install_requirements () {
          wkhtmltopdf \
          xvfb"
     
-    PIP="django==1.6.1 \
+    PIP="django==1.7 \
          django-celery-email==1.0.4 \
          django-fluent-dashboard==0.3.5 \
          https://bitbucket.org/izi/django-admin-tools/get/a0abfffd76a0.zip \

orchestra/utils/humanize.py

@@ -5,19 +5,27 @@ from django.utils.translation import ungettext, ugettext as _
 
 
 def pluralize_year(n):
-    return ungettext(_('{num:.1f} year ago'), _('{num:.1f} years ago'), n)
+    return ungettext(
+        _('{ahead}{num:.1f} year{ago}'),
+        _('{ahead}{num:.1f} years{ago}'), n)
 
 
 def pluralize_month(n):
-    return ungettext(_('{num:.1f} month ago'), _('{num:.1f} months ago'), n)
+    return ungettext(
+        _('{ahead}{num:.1f} month{ago}'),
+        _('{ahead}{num:.1f} months{ago}'), n)
 
 
 def pluralize_week(n):
-    return ungettext(_('{num:.1f} week ago'), _('{num:.1f} weeks ago'), n)
+    return ungettext(
+        _('{ahead}{num:.1f} week{ago}'),
+        _('{ahead}{num:.1f} weeks {ago}'), n)
 
 
 def pluralize_day(n):
-    return ungettext(_('{num:.1f} day ago'), _('{num:.1f} days ago'), n)
+    return ungettext(
+        _('{ahead}{num:.1f} day{ago}'),
+        _('{ahead}{num:.1f} days{ago}'), n)
 
 
 OLDER_CHUNKS = (
@@ -48,29 +56,34 @@ def naturaldate(date, include_seconds=False):
     minutes = delta.seconds / 60
     seconds = delta.seconds
     
+    ago = ' ago'
+    ahead = ''
     if days < 0:
-        return _('just now')
+        ago = ''
+        ahead = 'in '
+    days = abs(days)
     
     if days == 0:
         if hours == 0:
             if minutes > 0:
                 minutes += float(seconds)/60
                 return ungettext(
-                    _('{minutes:.1f} minute ago'),
+                    _('{ahead}{minutes:.1f} minute{ago}'),
-                    _('{minutes:.1f} minutes ago'), minutes
+                    _('{ahead}{minutes:.1f} minutes{ago}'), minutes
-                ).format(minutes=minutes)
+                ).format(minutes=minutes, ago=ago, ahead=ahead)
             else:
                 if include_seconds and seconds:
                     return ungettext(
-                        _('{seconds} second ago'),
+                        _('{ahead}{seconds} second{ago}'),
-                        _('{seconds} seconds ago'), seconds
+                        _('{ahead}{seconds} seconds{ago}'), seconds
-                    ).format(seconds=seconds)
+                    ).format(seconds=seconds, ago=ago, ahead=ahead)
                 return _('just now')
         else:
             hours += float(minutes)/60
             return ungettext(
-                _('{hours:.1f} hour ago'), _('{hours:.1f} hours ago'), hours
+                _('{ahead}{hours:.1f} hour{ago}'),
-            ).format(hours=hours)
+                _('{ahead}{hours:.1f} hours{ago}'), hours
+            ).format(hours=hours, ago=ago, ahead=ahead)
     
     if delta_midnight.days == 0:
         return _('yesterday at {time}').format(time=date.strftime('%H:%M'))
@@ -80,8 +93,9 @@ def naturaldate(date, include_seconds=False):
         if days < 7.0:
             count = days + float(hours)/24
             fmt = pluralize_day(count)
-            return fmt.format(num=count)
+            return fmt.format(num=count, ago=ago, ahead=ahead)
         if days >= chunk:
             count = (delta_midnight.days + 1) / chunk
+            count = abs(count)
             fmt = pluralizefun(count)
-            return fmt.format(num=count)
+            return fmt.format(num=count, ago=ago, ahead=ahead)