from __future__ import annotations

from django.core.management.base import BaseCommand, CommandError

from core.events.manticore import upsert_conversation_event
from core.models import ConversationEvent


class Command(BaseCommand):
    help = "Backfill behavioral events into Manticore from ConversationEvent rows."

    def add_arguments(self, parser):
        parser.add_argument(
            "--from-conversation-events",
            action="store_true",
            help="Replay ConversationEvent rows into the Manticore event table.",
        )
        parser.add_argument("--user-id", type=int, default=None)
        parser.add_argument("--limit", type=int, default=5000)

    def handle(self, *args, **options):
        if not bool(options.get("from_conversation_events")):
            raise CommandError("Pass --from-conversation-events to run this backfill.")

        queryset = (
            ConversationEvent.objects.select_related("session__identifier")
            .order_by("ts", "created_at")
        )
        user_id = options.get("user_id")
        if user_id is not None:
            queryset = queryset.filter(user_id=int(user_id))

        scanned = 0
        indexed = 0
        limit = max(1, int(options.get("limit") or 5000))
        for event in queryset[:limit]:
            scanned += 1
            upsert_conversation_event(event)
            indexed += 1

        self.stdout.write(
            self.style.SUCCESS(
                "manticore-backfill scanned=%s indexed=%s user=%s"
                % (scanned, indexed, user_id if user_id is not None else "-")
            )
        )