"""Deduplicate products: merge non-GTIN duplicates into a canonical record.

Usage:
    python -m opengoods.jobs.dedup --dry-run
    python -m opengoods.jobs.dedup --actor nightly
"""

from __future__ import annotations

import argparse
import sys

import psycopg

from opengoods.cache import bump_cache_epoch
from opengoods.etl.dedup import dedup_all
from opengoods.etl.load import default_dsn


def run(args: argparse.Namespace) -> int:
    with psycopg.connect(args.dsn, autocommit=False) as conn:
        summary = dedup_all(conn, actor=args.actor, dry_run=args.dry_run)
        if args.dry_run:
            conn.rollback()
        else:
            conn.commit()
    if not args.dry_run and summary["merged"]:
        bump_cache_epoch()
    mode = "dry-run" if args.dry_run else "applied"
    print(f"{mode} groups={summary['groups']} merged={summary['merged']}")
    return 0


def main(argv: list[str] | None = None) -> int:
    parser = argparse.ArgumentParser(description="Deduplicate OpenGoods products")
    parser.add_argument("--actor", default="ingestion", help="merge_log actor label")
    parser.add_argument("--dry-run", action="store_true", help="report only, do not write")
    parser.add_argument("--dsn", default=default_dsn(), help="PostgreSQL DSN")
    return run(parser.parse_args(argv))


if __name__ == "__main__":
    sys.exit(main())