#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Idempotentes Backfill-Skript für Capability-Facetten in Qdrant.

- Kompatibel mit qdrant-client 1.15.x: **kein** WithPayloadSelector-Import nötig
- Liest alle Punkte der Collection mit Payload (scroll, with_payload=True)
- Schreibt folgende Felder pro Point nach:
  * capability_keys
  * capability_ge1 .. capability_ge5
  * capability_eq1 .. capability_eq5

Hinweis: Das Skript setzt KEINE Vektoren neu, es aktualisiert nur Payload-Felder.
"""

import os
from typing import Dict, Any, List, Tuple, Optional
from qdrant_client import QdrantClient
from qdrant_client.models import Filter  # nur für API-Kompatibilität; wird hier leer genutzt

COLL = os.getenv("EXERCISE_COLLECTION", "exercises")
QDRANT_HOST = os.getenv("QDRANT_HOST", "localhost")
QDRANT_PORT = int(os.getenv("QDRANT_PORT", "6333"))
BATCH = int(os.getenv("BACKFILL_BATCH", "256"))


def _facet_capabilities(caps: Dict[str, Any]) -> Dict[str, List[str]]:
    caps = caps or {}

    def names_where(pred) -> List[str]:
        out = []
        for k, v in caps.items():
            try:
                iv = int(v)
            except Exception:
                iv = 0
            if pred(iv):
                s = str(k).strip()
                if s:
                    out.append(s)
        # stabil sortieren
        return sorted({s for s in out}, key=str.casefold)

    all_keys = sorted({str(k).strip() for k in caps.keys() if str(k).strip()}, key=str.casefold)

    return {
        "capability_keys": all_keys,
        # >= N
        "capability_ge1": names_where(lambda lv: lv >= 1),
        "capability_ge2": names_where(lambda lv: lv >= 2),
        "capability_ge3": names_where(lambda lv: lv >= 3),
        "capability_ge4": names_where(lambda lv: lv >= 4),
        "capability_ge5": names_where(lambda lv: lv >= 5),
        # == N
        "capability_eq1": names_where(lambda lv: lv == 1),
        "capability_eq2": names_where(lambda lv: lv == 2),
        "capability_eq3": names_where(lambda lv: lv == 3),
        "capability_eq4": names_where(lambda lv: lv == 4),
        "capability_eq5": names_where(lambda lv: lv == 5),
    }


def main() -> None:
    client = QdrantClient(host=QDRANT_HOST, port=QDRANT_PORT)

    # Sanity: Collection muss existieren
    info = client.get_collection(COLL)
    print(f"[Backfill] Collection '{COLL}' ok – vectors={info.config.params.vectors}")

    updated = 0
    offset = None
    page = 0

    while True:
        page += 1
        points, offset = client.scroll(
            collection_name=COLL,
            scroll_filter=None,        # alles
            offset=offset,
            limit=BATCH,
            with_payload=True,
        )
        if not points:
            break

        for pt in points:
            pld = pt.payload or {}
            caps = pld.get("capabilities") or {}
            facets = _facet_capabilities(caps)

            # Nur schreiben, wenn sich etwas ändert oder Felder fehlen
            need = False
            for k, v in facets.items():
                if pld.get(k) != v:
                    need = True
                    break
            if not need:
                continue

            # set_payload: pro Punkt separat (per-Point Payload)
            client.set_payload(collection_name=COLL, points=[pt.id], payload=facets)
            updated += 1
        print(f"[Backfill] page={page} processed={len(points)} updated_total={updated}")

    print(f"[Backfill] done. total_updated={updated}")


if __name__ == "__main__":
    main()