Add monthly list and summary data

main/views.py

@@ -1,21 +1,66 @@
+from calendar import monthrange
+from datetime import date, timedelta
+
+from django.db.models import Avg, Max, Min, Sum
 from django.http import HttpResponse
 from django.shortcuts import render
 from django.urls import reverse_lazy
+from django.utils import timezone
 from django.views.generic import CreateView, ListView
 
 from .forms import FuelPurchaseForm
 from .models import FuelPurchase
 
 
-def index(request):
-    return HttpResponse("Hello, world.")
-
-
-class FuelPurchaseListView(ListView):
+class FuelPurchaseMonthlyListView(ListView):
     model = FuelPurchase
-    template_name = "main/fuelpurchase_list.html"
+    template_name = "fuelpurchase_list.html"
     context_object_name = "purchases"
-    ordering = ['-purchase_date']
+
+    def get_queryset(self):
+        year = int(self.kwargs.get("year", timezone.now().year))
+        month = int(self.kwargs.get("month", timezone.now().month))
+        self.current_year = year
+        self.current_month = month
+
+        start_date = date(year, month, 1)
+        end_date = date(year, month, monthrange(year, month)[1])
+
+        return FuelPurchase.objects.filter(
+            purchase_date__range=(start_date, end_date)
+        ).order_by("-purchase_date")
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+
+        qs = self.object_list
+        summary = qs.aggregate(
+            total_cost_sum=Sum("total_cost"),
+            total_litres_sum=Sum("amount_litres"),
+            avg_price=Avg("price_per_litre"),
+            min_price=Min("price_per_litre"),
+            max_price=Max("price_per_litre"),
+        )
+
+        context["summary"] = summary
+        context["current_year"] = self.current_year
+        context["current_month"] = self.current_month
+
+        # Kuukausinavigointi
+        current_date = date(self.current_year, self.current_month, 1)
+        prev_month = current_date - timedelta(days=1)
+        next_month = (current_date.replace(day=28) + timedelta(days=4)).replace(day=1)
+
+        context["prev_year"] = prev_month.year
+        context["prev_month"] = prev_month.month
+        context["next_year"] = next_month.year
+        context["next_month"] = next_month.month
+
+        # Kaikki kuukaudet alasvetovalikkoon
+        all_dates = FuelPurchase.objects.dates("purchase_date", "month", order="DESC")
+        context["available_months"] = all_dates
+
+        return context
 
 
 class FuelPurchaseCreateView(CreateView):