"""
app/routers/admin.py — Admin-/Monitoring-Endpunkte (optional)

Zweck:
    Liefert einfache Kennzahlen zu Collections (Counts) und Config.
Kompatibilität:
    Python 3.12+, FastAPI 0.110+, qdrant-client 1.x
Version:
    0.1.0  (Erstanlage)
Stand:
    2025-10-07
Bezug:
    - Qdrant Collections: *_notes, *_chunks, *_edges
Nutzung:
    app.include_router(admin.router, prefix="/admin", tags=["admin"])
Änderungsverlauf:
    0.1.0 (2025-10-07) – Erstanlage.
"""

from __future__ import annotations
from fastapi import APIRouter
from qdrant_client import QdrantClient
from app.config import get_settings

router = APIRouter()

@router.get("/stats")
def stats():
    s = get_settings()
    client = QdrantClient(url=s.QDRANT_URL, api_key=s.QDRANT_API_KEY)
    notes = f"{s.COLLECTION_PREFIX}_notes"
    chunks = f"{s.COLLECTION_PREFIX}_chunks"
    edges = f"{s.COLLECTION_PREFIX}_edges"

    def _count(col: str) -> int:
        try:
            return client.count(collection_name=col, exact=True).count
        except Exception:
            return -1

    return {
        "collections": {
            "notes": {"name": notes, "count": _count(notes)},
            "chunks": {"name": chunks, "count": _count(chunks)},
            "edges": {"name": edges, "count": _count(edges)},
        },
        "config": {
            "qdrant": s.QDRANT_URL,
            "prefix": s.COLLECTION_PREFIX,
            "vector_size": s.VECTOR_SIZE,
            "distance": s.DISTANCE,
            "retriever": {
                "w_sem": s.RETRIEVER_W_SEM,
                "w_edge": s.RETRIEVER_W_EDGE,
                "w_cent": s.RETRIEVER_W_CENT,
                "top_k": s.RETRIEVER_TOP_K,
                "expand_depth": s.RETRIEVER_EXPAND_DEPTH,
            },
        },
    }