"""Import historical ERP evidence (miner output) into the central KB. Dry-run by default; --apply commits. Local data only, no provider call.

    python -m central.scripts.import_kb_history --staging /path/to/history [--apply] [--report out.json]

Runs against the database in DATABASE_URL (the Hub's PostgreSQL). Idempotent. Never touches any client database.
"""
import argparse
import json
import sys
import time
from pathlib import Path

from central.app.db import SessionLocal
from central.app.enrichment import history


def main(argv=None):
    ap = argparse.ArgumentParser()
    ap.add_argument("--staging", required=True)
    ap.add_argument("--apply", action="store_true")
    ap.add_argument("--report", default=None)
    ap.add_argument("--only-current-vigente-gtins", action="store_true", help="skip GTINs without any NCM evidence")
    args = ap.parse_args(argv)
    files = sorted(f for f in Path(args.staging).glob("*.json") if not f.name.startswith("_"))
    stagings = [json.loads(f.read_text(encoding="utf-8")) for f in files]
    t0 = time.time()
    obs = history.build_observations(stagings)
    if args.only_current_vigente_gtins:
        obs["gtins"] = {k: v for k, v in obs["gtins"].items() if v["ncm"]}
    with SessionLocal() as session:
        current = history.official_sets(session)
        report = history.apply(session, obs, lambda v: v in current, dry_run=not args.apply)
    report.update({"mode": "APPLY" if args.apply else "DRY_RUN", "clients": [s["client"] for s in stagings], "build_stats": obs["stats"], "seconds": round(time.time() - t0, 1)})
    text = json.dumps(report, indent=1, default=str)
    if args.report:
        Path(args.report).write_text(text, encoding="utf-8")
    print(text)


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