Add management command to import csv and update template

main/management/commands/import_monthly_trips.py

@@ -0,0 +1,60 @@
+import csv
+
+from django.core.management.base import BaseCommand
+
+from main.models import MonthlyTrip
+
+
+class Command(BaseCommand):
+    help = "Import fuel purchases from a CSV file"
+
+    def add_arguments(self, parser):
+        parser.add_argument('csv_file', type=str, help='Path to the CSV file')
+
+    def handle(self, *args, **kwargs):
+        csv_file = kwargs['csv_file']
+
+        MONTH_MAP = {
+            'Tammikuu': 1,
+            'Helmikuu': 2,
+            'Maaliskuu': 3,
+            'Huhtikuu': 4,
+            'Toukokuu': 5,
+            'Kesäkuu': 6,
+            'Heinäkuu': 7,
+            'Elokuu': 8,
+            'Syyskuu': 9,
+            'Lokakuu': 10,
+            'Marraskuu': 11,
+            'Joulukuu': 12,
+        }
+
+        with open(csv_file, newline='', encoding='utf-8') as f:
+            reader = csv.reader(f, delimiter=';')
+            headers = next(reader)
+
+            for line_number, row in enumerate(reader, start=2):
+                if len(row) < 3:
+                    self.stdout.write(self.style.WARNING(f"Skipped broken row {line_number}: {row}"))
+                    continue
+
+                try:
+                    year_str, month_name, value_str = row
+
+                    year = int(year_str.strip())
+                    month = MONTH_MAP.get(month_name.strip())
+                    value = int(value_str.strip())
+
+                    MonthlyTrip.objects.update_or_create(
+                        year=year,
+                        month=month,
+                        kilometers=value,
+                    )
+
+                    self.stdout.write(self.style.SUCCESS(f"Imported: {year} {month} {value}"))
+
+                except Exception as e:
+                    self.stdout.write(self.style.ERROR(f"Error on row {line_number}: {row}"))
+                    self.stdout.write(self.style.ERROR(str(e)))
+
+            self.stdout.write(self.style.SUCCESS("All imported successfully!"))