Implement price computing

coopeV3/utils.py

@@ -1,7 +1,7 @@
 import math
 
 def compute_price(price, a, b, c, alpha):
-    if price < a:
+    if price < alpha:
-        return price * (a + b * math.exp(-c/(price-alpha)**2))
+        return float(price) * (1 + float(a) + float(b) * math.exp(-c/(price-alpha)**2))
     else:
-        return price * a
+        return price * (1 + a)

gestion/forms.py

@@ -5,7 +5,7 @@ from django.contrib.auth.models import User
 from dal import autocomplete
 
 from .models import Reload, Refund, Product, Keg, Menu, Category
-from preferences.models import PaymentMethod
+from preferences.models import PaymentMethod, PriceProfile
 
 class ReloadForm(forms.ModelForm):
     """
@@ -136,4 +136,11 @@ class GenerateInvoiceForm(forms.Form):
     client_name = forms.CharField(label="Nom du client")
     client_address_fisrt_line = forms.CharField(label="Première ligne d'adresse")
     client_address_second_line = forms.CharField(label="Deuxième ligne d'adresse")
-    products = forms.CharField(widget=forms.Textarea, label="Produits", help_text="Au format nom;prix;quantité avec saut de ligne")
+    products = forms.CharField(widget=forms.Textarea, label="Produits", help_text="Au format nom;prix;quantité avec saut de ligne")
+
+class ComputePriceForm(forms.Form):
+    """
+    A form to compute price
+    """
+    price_profile = forms.ModelChoiceField(queryset=PriceProfile.objects.all(), label="Profil de prix")
+    price = forms.DecimalField(max_digits=10, decimal_places=5, label="Prix")

gestion/urls.py

@@ -55,4 +55,5 @@ urlpatterns = [
     path('stats', views.stats, name="stats"),
     path('divide', views.divide, name="divide"),
     path('gen_invoice', views.gen_invoice, name="gen_invoice"),
+    path('compute-price', views.compute_price_view, name="compute-price"),
 ]

gestion/views.py

@@ -14,13 +14,15 @@ from datetime import datetime, timedelta
 
 from django_tex.views import render_to_pdf
 from coopeV3.acl import active_required, acl_or, admin_required
+from coopeV3.utils import compute_price
 
 import simplejson as json
 from dal import autocomplete
 from decimal import *
 import os
+from math import floor, ceil
 
-from .forms import ReloadForm, RefundForm, ProductForm, KegForm, MenuForm, GestionForm, SearchMenuForm, SearchProductForm, SelectPositiveKegForm, SelectActiveKegForm, PinteForm, GenerateReleveForm, CategoryForm, SearchCategoryForm, GenerateInvoiceForm
+from .forms import ReloadForm, RefundForm, ProductForm, KegForm, MenuForm, GestionForm, SearchMenuForm, SearchProductForm, SelectPositiveKegForm, SelectActiveKegForm, PinteForm, GenerateReleveForm, CategoryForm, SearchCategoryForm, GenerateInvoiceForm, ComputePriceForm
 from .models import Product, Menu, Keg, ConsumptionHistory, KegHistory, Consumption, MenuHistory, Pinte, Reload, Refund, Category
 from users.models import School
 from preferences.models import PaymentMethod, GeneralPreferences, Cotisation, DivideHistory
@@ -1064,4 +1066,16 @@ def stats(request):
         "menus": menus,
         "payment_methods": payment_methods,
         "cotisations": cotisations,
-    })
+    })
+
+########## Compute price ##########
+
+def compute_price_view(request):
+    form = ComputePriceForm(request.POST or None)
+    if form.is_valid():
+        price_profile = form.cleaned_data["price_profile"]
+        price = compute_price(form.cleaned_data["price"], price_profile.a, price_profile.b, price_profile.c, price_profile.alpha)
+        form_p = "Le prix est " + str(ceil(100*price)/100) + " € (arrondi au centième) ou " + str(ceil(10*price)/10) + " € (arrondi au dixième)."
+    else:
+        form_p = ""
+    return render(request, "form.html", {"form": form, "form_title": "Calcul d'un prix", "form_button": "Calculer", "form_icon": "search_dollar", "form_p": form_p})

templates/nav.html

@@ -61,6 +61,9 @@
 <span class="tabulation2">
 	<i class="fa fa-search-dollar"></i> <a href="{% url 'preferences:priceProfilesIndex' %}">Profils de prix</a>
 </span>
+<span class="tabulation2">
+	<i class="fa fa-search-dollar"></i> <a href="{% url 'gestion:compute-price' %}">Calcul de prix</a>
+</span>
 {% endif %}
 <span class="tabulation2">
 	<i class="fa fa-bed"></i> <a href="{% url 'users:logout' %}">Deconnexion</a>