diff --git a/kfet/statistic.py b/kfet/statistic.py
index 09f9e935..5b5e297a 100644
--- a/kfet/statistic.py
+++ b/kfet/statistic.py
@@ -1,70 +1,117 @@
 # -*- coding: utf-8 -*-
+
+from dateutil.relativedelta import relativedelta
+
 from django.utils import timezone
 from django.db.models import Sum
 
 KFET_WAKES_UP_AT = 7
 
-# donne le nom des jours d'une liste de dates
-# dans un dico ordonné
-def daynames(dates):
-    names = {}
-    for i in dates:
-        names[i] = dates[i].strftime("%A")
-    return names
+
+def kfet_day(year, month, day, start_at=KFET_WAKES_UP_AT):
+    return timezone.datetime(year, month, day, hour=start_at)
 
 
-# donne le nom des semaines une liste de dates
-# dans un dico ordonné
-def weeknames(dates):
-    names = {}
-    for i in dates:
-        names[i] = dates[i].strftime("Semaine %W")
-    return names
+def to_kfet_day(dt, start_at=KFET_WAKES_UP_AT):
+    kfet_dt = kfet_day(year=dt.year, month=dt.month, day=dt.day)
+    if dt.hour < start_at:
+        kfet_dt -= timezone.timedelta(days=1)
+    return kfet_dt
 
 
-# donne le nom des mois d'une liste de dates
-# dans un dico ordonné
-def monthnames(dates):
-    names = {}
-    for i in dates:
-        names[i] = dates[i].strftime("%B")
-    return names
+class StatScale(object):
+    name = None
+    step = None
+
+    def __init__(self, n_steps=0, begin=None, end=None,
+                 last=False, std_chunk=True):
+        self.std_chunk = std_chunk
+        if last:
+            end = timezone.now()
+
+        if begin is not None and n_steps != 0:
+            self.begin = self.get_from(begin)
+            self.end = self.do_step(self.begin, n_steps=n_steps)
+        elif end is not None and n_steps != 0:
+            self.end = self.get_from(end)
+            self.begin = self.do_step(self.end, n_steps=-n_steps)
+        elif begin is not None and end is not None:
+            self.begin = self.get_from(begin)
+            self.end = self.get_from(end)
+        else:
+            raise Exception('Two of these args must be specified: '
+                            'n_steps, begin, end; '
+                            'or use last and n_steps')
+
+        self.datetimes = self.get_datetimes()
+
+    @staticmethod
+    def by_name(name):
+        for cls in StatScale.__subclasses__():
+            if cls.name == name:
+                return cls
+        raise Exception('scale %s not found' % name)
+
+    def get_from(self, dt):
+        return self.std_chunk and self.get_chunk_start(dt) or dt
+
+    def __getitem__(self, i):
+        return self.datetimes[i], self.datetimes[i+1]
+
+    def __len__(self):
+        return len(self.datetimes) - 1
+
+    def do_step(self, dt, n_steps=1):
+        return dt + self.step * n_steps
+
+    def get_datetimes(self):
+        datetimes = [self.begin]
+        tmp = self.begin
+        while tmp <= self.end:
+            tmp = self.do_step(tmp)
+            datetimes.append(tmp)
+        return datetimes
+
+    def get_labels(self, label_fmt=None):
+        if label_fmt is None:
+            label_fmt = self.label_fmt
+        return [begin.strftime(label_fmt) for begin, end in self]
+
+    @classmethod
+    def get_chunk_start(cls, dt):
+        dt_kfet = to_kfet_day(dt)
+        start = dt_kfet - cls.offset_to_chunk_start(dt_kfet)
+        return start
 
 
-# rend les dates des nb derniers jours
-# dans l'ordre chronologique
-# aujourd'hui compris
-# nb = 1 : rend hier
-def lastdays(nb):
-    morning = this_morning()
-    days = {}
-    for i in range(1, nb+1):
-        days[i] = morning - timezone.timedelta(days=nb - i + 1)
-    return days
+class DayStatScale(StatScale):
+    name = 'day'
+    step = timezone.timedelta(days=1)
+    label_fmt = '%A'
+
+    @classmethod
+    def get_chunk_start(cls, dt):
+        return to_kfet_day(dt)
 
 
-def lastweeks(nb):
-    monday_morning = this_monday_morning()
-    mondays = {}
-    for i in range(1, nb+1):
-        mondays[i] = monday_morning \
-                    - timezone.timedelta(days=7*(nb - i + 1))
-    return mondays
+class WeekStatScale(StatScale):
+    name = 'week'
+    step = timezone.timedelta(days=7)
+    label_fmt = 'Semaine %W'
+
+    @classmethod
+    def offset_to_chunk_start(cls, dt):
+        return timezone.timedelta(days=dt.weekday())
 
 
-def lastmonths(nb):
-    first_month_day = this_first_month_day()
-    first_days = {}
-    this_year = first_month_day.year
-    this_month = first_month_day.month
-    for i in range(1, nb+1):
-        month = ((this_month - 1 - (nb - i)) % 12) + 1
-        year = this_year + (nb - i) // 12
-        first_days[i] = timezone.datetime(year=year,
-                                          month=month,
-                                          day=1,
-                                          hour=KFET_WAKES_UP_AT)
-    return first_days
+class MonthStatScale(StatScale):
+    name = 'month'
+    step = relativedelta(months=1)
+    label_fmt = '%B'
+
+    @classmethod
+    def get_chunk_start(cls, dt):
+        return to_kfet_day(dt).replace(day=1)
 
 
 def this_first_month_day():
diff --git a/kfet/urls.py b/kfet/urls.py
index ddd40ce6..2eeef513 100644
--- a/kfet/urls.py
+++ b/kfet/urls.py
@@ -69,18 +69,12 @@ urlpatterns = [
         name='kfet.account.negative'),
 
     # Account - Statistics
-    url('^accounts/(?P<trigramme>.{3})/stat/last/$',
-        views.AccountStatLastAll.as_view(),
-        name = 'kfet.account.stat.last'),
-    url('^accounts/(?P<trigramme>.{3})/stat/last/month/$',
-        views.AccountStatLastMonth.as_view(),
-        name = 'kfet.account.stat.last.month'),
-    url('^accounts/(?P<trigramme>.{3})/stat/last/week/$',
-        views.AccountStatLastWeek.as_view(),
-        name = 'kfet.account.stat.last.week'),
-    url('^accounts/(?P<trigramme>.{3})/stat/last/day/$',
-        views.AccountStatLastDay.as_view(),
-        name = 'kfet.account.stat.last.day'),
+    url('^accounts/(?P<trigramme>.{3})/stat/operations/list$',
+        views.AccountStatOperationList.as_view(),
+        name='kfet.account.stat.operation.list'),
+    url('^accounts/(?P<trigramme>.{3})/stat/operations$',
+        views.AccountStatOperation.as_view(),
+        name='kfet.account.stat.operation'),
 
     url(r'^accounts/(?P<trigramme>.{3})/stat/balance/list$',
         views.AccountStatBalanceList.as_view(),
diff --git a/kfet/views.py b/kfet/views.py
index 58413d80..0b62cd2e 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 
+import ast
 from urllib.parse import urlencode
 
 from django.shortcuts import render, get_object_or_404, redirect
@@ -47,10 +48,10 @@ from decimal import Decimal
 import django_cas_ng
 import heapq
 import statistics
-from .statistic import daynames, monthnames, weeknames, \
-        lastdays, lastweeks, lastmonths, \
-        this_morning, this_monday_morning, this_first_month_day, \
-        tot_ventes
+from kfet.statistic import DayStatScale, MonthStatScale, StatScale, WeekStatScale
+from .statistic import (
+    this_morning, this_monday_morning, this_first_month_day, tot_ventes,
+)
 
 class Home(TemplateView):
     template_name   = "kfet/home.html"
@@ -2282,138 +2283,128 @@ ID_PREFIX_ACC_LAST_MONTHS = "last_months_acc"
 
 # Un résumé de toutes les vues ArticleStatLast
 # NE REND PAS DE JSON
-class AccountStatLastAll(SingleResumeStat):
+class AccountStatOperationList(PkUrlMixin, SingleResumeStat):
     model = Account
     context_object_name = 'account'
-    trigramme_url_kwarg = 'trigramme'
+    pk_url_kwarg = 'trigramme'
     id_prefix = ID_PREFIX_ACC_LAST
-    nb_stat = 3
     nb_default = 2
-    stat_labels = ["Derniers mois", "Dernières semaines", "Derniers jours"]
-    stat_urls = ['kfet.account.stat.last.month',
-                 'kfet.account.stat.last.week',
-                 'kfet.account.stat.last.day']
+    stats = [
+        {
+            'label': 'Derniers mois',
+            'url_params': dict(
+                types=[Operation.PURCHASE],
+                scale=MonthStatScale.name,
+                scale_args=dict(
+                    last=True,
+                    n_steps=7,
+                ),
+            ),
+        },
+        {
+            'label': 'Dernières semaines',
+            'url_params': dict(
+                types=[Operation.PURCHASE],
+                last_days=49,
+                scale=WeekStatScale.name,
+                scale_args=dict(
+                    last=True,
+                    n_steps=7,
+                ),
+            ),
+        },
+        {
+            'label': 'Derniers jours',
+            'url_params': dict(
+                types=[Operation.PURCHASE],
+                last_days=7,
+                scale=DayStatScale.name,
+                scale_args=dict(
+                    last=True,
+                    n_steps=7,
+                ),
+            ),
+        },
+    ]
+    url_stat = 'kfet.account.stat.operation'
 
-    def get_object(self, **kwargs):
-        trigramme = self.kwargs.get(self.trigramme_url_kwarg)
-        return get_object_or_404(Account, trigramme=trigramme)
-
-    def get_object_url_kwargs(self, **kwargs):
-        return {'trigramme': self.object.trigramme}
+    def get_object(self, *args, **kwargs):
+        obj = super().get_object(*args, **kwargs)
+        if self.request.user != obj.user:
+            raise PermissionDenied
+        return obj
 
     @method_decorator(login_required)
     def dispatch(self, *args, **kwargs):
-        return super(AccountStatLastAll, self).dispatch(*args, **kwargs)
+        return super().dispatch(*args, **kwargs)
 
 
-class AccountStatLast(JSONDetailView):
+class AccountStatOperation(PkUrlMixin, JSONDetailView):
     """
     Returns a JSON containing the evolution a the personnal
     consommation of a trigramme at the diffent dates specified
     """
     model = Account
-    trigramme_url_kwarg = 'trigramme'
+    pk_url_kwarg = 'trigramme'
     context_object_name = 'account'
-    end_date = timezone.now()
     id_prefix = ""
 
-    # doit rendre un dictionnaire des dates
-    # la première date correspond au début
-    # la dernière date est la fin de la dernière plage
-    def get_dates(self, **kwargs):
-        return {}
-
-    # doit rendre un dictionnaire des labels
-    # le dernier label ne sera pas utilisé
-    def get_labels(self, **kwargs):
-        pass
-
-    def get_object(self, **kwargs):
-        trigramme = self.kwargs.get(self.trigramme_url_kwarg)
-        return get_object_or_404(Account, trigramme=trigramme)
-
-    def sort_operations(self, **kwargs):
-        # On récupère les dates
-        dates = self.get_dates()
-        # On ajoute la date de fin
-        extended_dates = dates.copy()
-        extended_dates[len(dates)+1] = self.end_date
+    def get_operations(self, types, scale):
         # On selectionne les opérations qui correspondent
         # à l'article en question et qui ne sont pas annulées
         # puis on choisi pour chaques intervalle les opérations
         # effectuées dans ces intervalles de temps
         all_operations = (Operation.objects
-                          .filter(type='purchase')
+                          .filter(type__in=types)
                           .filter(group__on_acc=self.object)
                           .filter(canceled_at=None)
                           )
-        operations = {}
-        for i in dates:
-            operations[i] = (all_operations
-                             .filter(group__at__gte=extended_dates[i])
-                             .filter(group__at__lte=extended_dates[i+1])
-                             )
+        operations = []
+        for begin, end in scale:
+            operations.append(all_operations
+                              .filter(group__at__gte=begin,
+                                      group__at__lte=end))
         return operations
 
     def get_context_data(self, **kwargs):
         context = {}
-        nb_ventes = {}
+
+        scale = self.request.GET.get('scale', None)
+        if scale is None:
+            scale = DayStatScale(n_steps=7, last=True)
+        else:
+            scale_cls = StatScale.by_name(scale)
+            scale_args = self.request.GET.get('scale_args', '{}')
+            scale = scale_cls(**ast.literal_eval(scale_args))
+        print(scale.datetimes)
+
+        types = self.request.GET.get('types', None)
+        if types is not None:
+            types = ast.literal_eval(types)
+
+        operations = self.get_operations(types=types, scale=scale)
         # On récupère les labels des dates
-        context['labels'] = self.get_labels().copy()
+        context['labels'] = scale.get_labels()
         # On compte les opérations
-        operations = self.sort_operations()
-        for i in operations:
-            nb_ventes[i] = tot_ventes(operations[i])
-        context['charts'] = [ { "color": "rgb(255, 99, 132)",
-                                "label": "NB items achetés",
-                                "values": nb_ventes } ]
+        nb_ventes = []
+        for chunk in operations:
+            nb_ventes.append(tot_ventes(chunk))
+
+        context['labels'] = scale.get_labels()
+        context['charts'] = [{"color": "rgb(255, 99, 132)",
+                              "label": "NB items achetés",
+                              "values": nb_ventes}]
         return context
 
+    def get_object(self, *args, **kwargs):
+        obj = super().get_object(*args, **kwargs)
+        if self.request.user != obj.user:
+            raise PermissionDenied
+        return obj
+
     @method_decorator(login_required)
     def dispatch(self, *args, **kwargs):
-        return super(AccountStatLast, self).dispatch(*args, **kwargs)
-
-
-# Rend les achats pour ce compte des 7 derniers jours
-# Aujourd'hui non compris
-class AccountStatLastDay(AccountStatLast):
-    end_date = this_morning()
-    id_prefix = ID_PREFIX_ACC_LAST_DAYS
-
-    def get_dates(self, **kwargs):
-        return lastdays(7)
-
-    def get_labels(self, **kwargs):
-        days = lastdays(7)
-        return daynames(days)
-
-
-# Rend les achats de ce compte des 7 dernières semaines
-# La semaine en cours n'est pas comprise
-class AccountStatLastWeek(AccountStatLast):
-    end_date = this_monday_morning()
-    id_prefix = ID_PREFIX_ACC_LAST_WEEKS
-
-    def get_dates(self, **kwargs):
-        return lastweeks(7)
-
-    def get_labels(self, **kwargs):
-        weeks = lastweeks(7)
-        return weeknames(weeks)
-
-
-# Rend les achats de ce compte des 7 derniers mois
-# Le mois en cours n'est pas compris
-class AccountStatLastMonth(AccountStatLast):
-    end_date = this_monday_morning()
-    id_prefix = ID_PREFIX_ACC_LAST_MONTHS
-
-    def get_dates(self, **kwargs):
-        return lastmonths(7)
-
-    def get_labels(self, **kwargs):
-        months = lastmonths(7)
-        return monthnames(months)
+        return super().dispatch(*args, **kwargs)
 
 
 # ------------------------