From df8b23a4a195a5ad3340ef15273afc7e2d7a4dc6 Mon Sep 17 00:00:00 2001
From: imperosol <thgirod@hotmail.com>
Date: Wed, 26 Nov 2025 13:22:43 +0100
Subject: [PATCH] product formulas management views

---
 counter/forms.py                             | 26 ++++++++++-
 counter/templates/counter/formula_list.jinja | 35 +++++++++++++++
 counter/urls.py                              | 22 ++++++++++
 counter/views/admin.py                       | 45 ++++++++++++++++++++
 counter/views/mixins.py                      |  5 +++
 5 files changed, 131 insertions(+), 2 deletions(-)
 create mode 100644 counter/templates/counter/formula_list.jinja

diff --git a/counter/forms.py b/counter/forms.py
index ed47232a..43f94720 100644
--- a/counter/forms.py
+++ b/counter/forms.py
@@ -5,6 +5,7 @@ from datetime import date, datetime, timezone
 
 from dateutil.relativedelta import relativedelta
 from django import forms
+from django.core.exceptions import ValidationError
 from django.db.models import Exists, OuterRef, Q
 from django.forms import BaseModelFormSet
 from django.utils.timezone import now
@@ -34,6 +35,7 @@ from counter.models import (
     Eticket,
     InvoiceCall,
     Product,
+    ProductFormula,
     Refilling,
     ReturnableProduct,
     ScheduledProductAction,
@@ -349,13 +351,33 @@ class ProductForm(forms.ModelForm):
         return product
 
 
+class ProductFormulaForm(forms.ModelForm):
+    class Meta:
+        model = ProductFormula
+        fields = ["products", "result"]
+        widgets = {
+            "products": AutoCompleteSelectMultipleProduct,
+            "result": AutoCompleteSelectProduct,
+        }
+
+    def clean(self):
+        cleaned_data = super().clean()
+        prices = [p.selling_price for p in cleaned_data["products"]]
+        selling_price = cleaned_data["result"].selling_price
+        if selling_price > sum(prices):
+            raise ValidationError(
+                _("This formula is more expensive than its constituant products.")
+            )
+        return cleaned_data
+
+
 class ReturnableProductForm(forms.ModelForm):
     class Meta:
         model = ReturnableProduct
         fields = ["product", "returned_product", "max_return"]
         widgets = {
-            "product": AutoCompleteSelectProduct(),
-            "returned_product": AutoCompleteSelectProduct(),
+            "product": AutoCompleteSelectProduct,
+            "returned_product": AutoCompleteSelectProduct,
         }
 
     def save(self, commit: bool = True) -> ReturnableProduct:  # noqa FBT
diff --git a/counter/templates/counter/formula_list.jinja b/counter/templates/counter/formula_list.jinja
new file mode 100644
index 00000000..dab19302
--- /dev/null
+++ b/counter/templates/counter/formula_list.jinja
@@ -0,0 +1,35 @@
+{% extends "core/base.jinja" %}
+
+{% block title %}
+  {% trans %}Product formulas{% endtrans %}
+{% endblock %}
+
+{% block additional_css %}
+  <link rel="stylesheet" href="{{ static("core/components/card.scss") }}">
+  <link rel="stylesheet" href="{{ static("counter/css/admin.scss") }}">
+{% endblock %}
+
+{% block content %}
+  <main>
+    <h3 class="margin-bottom">{% trans %}Product formulas{% endtrans %}</h3>
+    <p>
+      <a href="{{ url('counter:product_formula_create') }}" class="btn btn-blue">
+        {% trans %}New formula{% endtrans %}
+        <i class="fa fa-plus"></i>
+      </a>
+    </p>
+    <ul class="product-group">
+      {%- for formula in object_list -%}
+        <li>
+          <a href="{{ url('counter:product_formula_edit', formula_id=formula.id) }}">
+            {{ formula.result.name }}
+          </a>
+          <a href="{{ url('counter:product_formula_delete', formula_id=formula.id) }}">
+            <i class="fa fa-trash delete-action"></i>
+          </a>
+        </li>
+      {%- endfor -%}
+    </ul>
+  </div>
+  </main>
+{% endblock %}
diff --git a/counter/urls.py b/counter/urls.py
index 67c7d950..9637ecd0 100644
--- a/counter/urls.py
+++ b/counter/urls.py
@@ -25,6 +25,10 @@ from counter.views.admin import (
     CounterStatView,
     ProductCreateView,
     ProductEditView,
+    ProductFormulaCreateView,
+    ProductFormulaDeleteView,
+    ProductFormulaEditView,
+    ProductFormulaListView,
     ProductListView,
     ProductTypeCreateView,
     ProductTypeEditView,
@@ -116,6 +120,24 @@ urlpatterns = [
         ProductEditView.as_view(),
         name="product_edit",
     ),
+    path(
+        "admin/formula/", ProductFormulaListView.as_view(), name="product_formula_list"
+    ),
+    path(
+        "admin/formula/new/",
+        ProductFormulaCreateView.as_view(),
+        name="product_formula_create",
+    ),
+    path(
+        "admin/formula/<int:formula_id>/edit",
+        ProductFormulaEditView.as_view(),
+        name="product_formula_edit",
+    ),
+    path(
+        "admin/formula/<int:formula_id>/delete",
+        ProductFormulaDeleteView.as_view(),
+        name="product_formula_delete",
+    ),
     path(
         "admin/product-type/list/",
         ProductTypeListView.as_view(),
diff --git a/counter/views/admin.py b/counter/views/admin.py
index 24c112f5..ad48c435 100644
--- a/counter/views/admin.py
+++ b/counter/views/admin.py
@@ -34,11 +34,13 @@ from counter.forms import (
     CloseCustomerAccountForm,
     CounterEditForm,
     ProductForm,
+    ProductFormulaForm,
     ReturnableProductForm,
 )
 from counter.models import (
     Counter,
     Product,
+    ProductFormula,
     ProductType,
     Refilling,
     ReturnableProduct,
@@ -162,6 +164,49 @@ class ProductEditView(CounterAdminTabsMixin, CounterAdminMixin, UpdateView):
     current_tab = "products"
 
 
+class ProductFormulaListView(CounterAdminTabsMixin, PermissionRequiredMixin, ListView):
+    model = ProductFormula
+    queryset = ProductFormula.objects.select_related("result")
+    template_name = "counter/formula_list.jinja"
+    current_tab = "formulas"
+    permission_required = "counter.view_productformula"
+
+
+class ProductFormulaCreateView(
+    CounterAdminTabsMixin, PermissionRequiredMixin, CreateView
+):
+    model = ProductFormula
+    form_class = ProductFormulaForm
+    pk_url_kwarg = "formula_id"
+    template_name = "core/create.jinja"
+    current_tab = "formulas"
+    success_url = reverse_lazy("counter:product_formula_list")
+    permission_required = "counter.add_productformula"
+
+
+class ProductFormulaEditView(
+    CounterAdminTabsMixin, PermissionRequiredMixin, UpdateView
+):
+    model = ProductFormula
+    form_class = ProductFormulaForm
+    pk_url_kwarg = "formula_id"
+    template_name = "core/edit.jinja"
+    current_tab = "formulas"
+    success_url = reverse_lazy("counter:product_formula_list")
+    permission_required = "counter.change_productformula"
+
+
+class ProductFormulaDeleteView(
+    CounterAdminTabsMixin, PermissionRequiredMixin, DeleteView
+):
+    model = ProductFormula
+    pk_url_kwarg = "formula_id"
+    template_name = "core/delete_confirm.jinja"
+    current_tab = "formulas"
+    success_url = reverse_lazy("counter:product_formula_list")
+    permission_required = "counter.delete_productformula"
+
+
 class ReturnableProductListView(
     CounterAdminTabsMixin, PermissionRequiredMixin, ListView
 ):
diff --git a/counter/views/mixins.py b/counter/views/mixins.py
index c7fabdd6..2cce25b4 100644
--- a/counter/views/mixins.py
+++ b/counter/views/mixins.py
@@ -100,6 +100,11 @@ class CounterAdminTabsMixin(TabedViewMixin):
             "slug": "products",
             "name": _("Products"),
         },
+        {
+            "url": reverse_lazy("counter:product_formula_list"),
+            "slug": "formulas",
+            "name": _("Formulas"),
+        },
         {
             "url": reverse_lazy("counter:product_type_list"),
             "slug": "product_types",