from __future__ import annotations

import json
import time

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

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


class Command(BaseCommand):
    help = "Quick non-mutating sanity check for recent canonical event writes."

    def _recent_rows(self, *, minutes: int, service: str, user_id: str, limit: int):
        cutoff_ts = int(time.time() * 1000) - (minutes * 60 * 1000)
        queryset = ConversationEvent.objects.filter(ts__gte=cutoff_ts).order_by("-ts")
        if service:
            queryset = queryset.filter(origin_transport=service)
        if user_id:
            queryset = queryset.filter(user_id=user_id)

        rows = list(
            queryset.values(
                "id",
                "user_id",
                "session_id",
                "ts",
                "event_type",
                "direction",
                "origin_transport",
                "trace_id",
            )[:limit]
        )
        if rows:
            return rows, "django"
        try:
            manticore_rows = get_recent_event_rows(
                minutes=minutes,
                service=service,
                user_id=user_id,
                limit=limit,
            )
        except Exception:
            manticore_rows = []
        return manticore_rows, "manticore" if manticore_rows else "django"

    def add_arguments(self, parser):
        parser.add_argument("--minutes", type=int, default=120)
        parser.add_argument("--service", default="")
        parser.add_argument("--user-id", default="")
        parser.add_argument("--limit", type=int, default=200)
        parser.add_argument("--require-types", default="")
        parser.add_argument("--fail-if-empty", action="store_true", default=False)
        parser.add_argument("--json", action="store_true", default=False)

    def handle(self, *args, **options):
        minutes = max(1, int(options.get("minutes") or 120))
        service = str(options.get("service") or "").strip().lower()
        user_id = str(options.get("user_id") or "").strip()
        limit = max(1, int(options.get("limit") or 200))
        require_types_raw = str(options.get("require_types") or "").strip()
        fail_if_empty = bool(options.get("fail_if_empty"))
        as_json = bool(options.get("json"))
        required_types = [
            item.strip().lower()
            for item in require_types_raw.split(",")
            if item.strip()
        ]

        rows, data_source = self._recent_rows(
            minutes=minutes,
            service=service,
            user_id=user_id,
            limit=limit,
        )
        event_type_counts = {}
        for row in rows:
            key = str(row.get("event_type") or "")
            event_type_counts[key] = int(event_type_counts.get(key) or 0) + 1
        missing_required_types = [
            event_type
            for event_type in required_types
            if int(event_type_counts.get(event_type) or 0) <= 0
        ]

        payload = {
            "minutes": minutes,
            "service": service,
            "user_id": user_id,
            "data_source": data_source,
            "count": len(rows),
            "event_type_counts": event_type_counts,
            "required_types": required_types,
            "missing_required_types": missing_required_types,
            "sample": rows[:25],
        }

        if as_json:
            self.stdout.write(json.dumps(payload, indent=2, sort_keys=True))
            return

        self.stdout.write(
            f"event-ledger-smoke minutes={minutes} service={service or '-'} user={user_id or '-'} source={data_source} count={len(rows)}"
        )
        self.stdout.write(f"event_type_counts={event_type_counts}")
        if required_types:
            self.stdout.write(
                f"required_types={required_types} missing_required_types={missing_required_types}"
            )

        if fail_if_empty and len(rows) == 0:
            raise CommandError("No recent canonical event rows found.")
        if missing_required_types:
            raise CommandError(
                "Missing required event types: " + ", ".join(missing_required_types)
            )