feat: add calendar view

app/apps/calendar_view/apps.py

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+from django.apps import AppConfig
+
+
+class CalendarViewConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "apps.calendar_view"

app/apps/calendar_view/urls.py

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+from django.urls import path
+
+from . import views
+
+urlpatterns = [
+    path("calendar/", views.index, name="calendar_index"),
+    path(
+        "calendar/<int:month>/<int:year>/list/",
+        views.calendar_list,
+        name="calendar_list",
+    ),
+    path(
+        "calendar/<int:day>/<int:month>/<int:year>/transactions/",
+        views.calendar_transactions_list,
+        name="calendar_transactions_list",
+    ),
+    path(
+        "calendar/<int:month>/<int:year>/",
+        views.calendar,
+        name="calendar",
+    ),
+    # path(
+    #     "calendar/available_dates/",
+    #     views.month_year_picker,
+    #     name="available_dates",
+    # ),
+]

app/apps/calendar_view/utils/calendar.py

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+from datetime import datetime, date
+import calendar
+
+from apps.transactions.models import Transaction
+
+
+# def get_transactions_by_day(year, month):
+#     # Get all transactions for the month
+#     transactions = Transaction.objects.filter(
+#         date__year=year, date__month=month
+#     ).order_by("date")
+#
+#     # Create a dictionary with all days of the month
+#     all_days = {
+#         day: {"day": day, "date": date(year, month, day), "transactions": []}
+#         for day in range(1, calendar.monthrange(year, month)[1] + 1)
+#     }
+#
+#     # Group transactions by day
+#     for transaction in transactions:
+#         day = transaction.date.day
+#         all_days[day]["transactions"].append(transaction)
+#
+#     # Convert to list and sort by day
+#     result = list(all_days.values())
+#
+#     return result
+
+
+def get_transactions_by_day(year, month):
+    # Configure calendar to start on Monday
+    calendar.setfirstweekday(calendar.MONDAY)
+
+    # Get the first and last day of the month
+    first_day = date(year, month, 1)
+
+    # Get all transactions for the month
+    transactions = Transaction.objects.filter(
+        date__year=year, date__month=month
+    ).order_by("date")
+
+    # Calculate padding days needed
+    padding_days = first_day.weekday()  # Monday is 0, Sunday is 6
+
+    # Create padding days as empty dicts
+    padding_dates = [{}] * padding_days
+
+    # Create current month days
+    current_month_dates = [
+        {"day": day, "date": date(year, month, day), "transactions": []}
+        for day in range(1, calendar.monthrange(year, month)[1] + 1)
+    ]
+
+    # Group transactions by day
+    for transaction in transactions:
+        day = transaction.date.day
+        for day_data in current_month_dates:
+            if day_data["day"] == day:
+                day_data["transactions"].append(transaction)
+                break
+
+    # Combine padding and current month dates
+    result = padding_dates + current_month_dates
+
+    return result

app/apps/calendar_view/views.py

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+import datetime
+
+from django.contrib.auth.decorators import login_required
+from django.shortcuts import redirect, render
+from django.utils import timezone
+from django.views.decorators.http import require_http_methods
+
+from apps.calendar_view.utils.calendar import get_transactions_by_day
+from apps.transactions.models import Transaction
+
+
+@login_required
+def index(request):
+    now = timezone.localdate(timezone.now())
+
+    return redirect(to="calendar", month=now.month, year=now.year)
+
+
+@login_required
+@require_http_methods(["GET"])
+def calendar(request, month: int, year: int):
+    if month < 1 or month > 12:
+        from django.http import Http404
+
+        raise Http404("Month is out of range")
+
+    next_month = 1 if month == 12 else month + 1
+    next_year = year + 1 if next_month == 1 and month == 12 else year
+
+    previous_month = 12 if month == 1 else month - 1
+    previous_year = year - 1 if previous_month == 12 and month == 1 else year
+
+    return render(
+        request,
+        "calendar_view/pages/calendar.html",
+        context={
+            "month": month,
+            "year": year,
+            "next_month": next_month,
+            "next_year": next_year,
+            "previous_month": previous_month,
+            "previous_year": previous_year,
+        },
+    )
+
+
+@login_required
+@require_http_methods(["GET"])
+def calendar_list(request, month: int, year: int):
+    today = timezone.localdate(timezone.now())
+    dates = get_transactions_by_day(month=month, year=year)
+
+    return render(
+        request,
+        "calendar_view/fragments/list.html",
+        context={
+            "month": month,
+            "year": year,
+            "today": today,
+            "dates": dates,
+        },
+    )
+
+
+@login_required
+@require_http_methods(["GET"])
+def calendar_transactions_list(request, day: int, month: int, year: int):
+    date = datetime.date(year=year, month=month, day=day)
+    transactions = Transaction.objects.filter(date=date)
+
+    return render(
+        request,
+        "calendar_view/fragments/list_transactions.html",
+        context={
+            "date": date,
+            "transactions": transactions,
+        },
+    )