"""Purge items trashed at least 5 days ago (run by the server hourly)."""
from datetime import timedelta
from django.core.management.base import BaseCommand, CommandError
from django.utils import timezone
from drive.models import DriveItem
from drive.trash_cleanup import delete_trashed_item, has_active_uploads_in_tree


class Command(BaseCommand):
    help = 'Supprime définitivement les éléments dans la corbeille depuis 5 jours.'

    def add_arguments(self, parser):
        parser.add_argument('--days', type=int, default=5)
        parser.add_argument('--dry-run', action='store_true')

    def handle(self, *args, **options):
        days = options['days']
        if days < 1:
            raise CommandError('Le délai doit être supérieur ou égal à 1 jour.')
        limit = timezone.now() - timedelta(days=days)
        purged = skipped = 0
        # Fetch IDs first: cascading parent deletion can remove children.
        ids = list(DriveItem.objects.filter(trashed_at__lte=limit).order_by('trashed_at').values_list('pk', flat=True))
        for pk in ids:
            item = DriveItem.objects.filter(pk=pk).select_related('space','parent').first()
            if item is None:
                continue
            try:
                if has_active_uploads_in_tree(item):
                    skipped += 1
                    continue
                if not options['dry_run']:
                    delete_trashed_item(item)
                purged += 1
            except (OSError, ValueError) as exc:
                skipped += 1
                self.stderr.write(f'Élément {pk} conservé : {exc}')
        verb = 'à supprimer' if options['dry_run'] else 'supprimé(s)'
        self.stdout.write(f'{purged} élément(s) {verb}, {skipped} ignoré(s).')