"""
app/main.py — mindnet API bootstrap (WP-04 Hooks)

Zweck:
    Startpunkt der FastAPI-Anwendung: Router-Registrierung und Healthcheck.
    Ergänzt um optionale WP-04 Router (Graph/Retriever), falls vorhanden.
Kompatibilität:
    Python 3.12+; FastAPI 0.110+ (getestet lokal)
Version:
    0.4.1  (WP-04 Hooks erweitert: Feature-Flags & /admin/features; bestehende Routen unverändert)
Stand:
    2025-10-07
Bezug:
    Handbuch & Knowledge Design (WP-03/04)
Umgebung:
    Siehe app/config.py (QDRANT_URL, MINDNET_PREFIX, usw.)
Nutzung:
    uvicorn app.main:app --reload --port 8000
Änderungsverlauf:
    0.4.1 (2025-10-07) – Feature-Flags für dynamische WP-04-Router + /admin/features ergänzt.
    0.4.0 (2025-10-06) – /admin/meta ergänzt; optionale Einbindung von graph/query/admin Routern.
    0.3.x (vorher)      – Basisversion laut bereitgestellter Datei.

Hinweise:
    Bestehende Routen/Funktionen bleiben unverändert.
"""

from __future__ import annotations

from fastapi import FastAPI
from .config import get_settings
from .routers.embed_router import router as embed_router
from .routers.qdrant_router import router as qdrant_router


def _maybe_include_wp04(app: FastAPI) -> None:
    """
    WP-04 Router dynamisch einbinden, ohne harte Abhängigkeit.
    Ergänzung: setzt app.state.features['wp04']-Flags, damit Admin/Monitoring
    sichtbar machen kann, was tatsächlich geladen wurde.
    """
    # Initialisiere Feature-Flags
    if not hasattr(app.state, "features"):
        app.state.features = {}
    app.state.features.setdefault("wp04", {"graph": False, "query": False, "admin": False})

    # Graph
    try:
        from .routers.graph import router as graph_router  # type: ignore
        app.include_router(graph_router, prefix="/graph", tags=["graph"])
        app.state.features["wp04"]["graph"] = True
    except Exception:
        pass

    # Query
    try:
        from .routers.query import router as query_router  # type: ignore
        app.include_router(query_router, prefix="/query", tags=["query"])
        app.state.features["wp04"]["query"] = True
    except Exception:
        pass

    # Admin (optional)
    try:
        from .routers.admin import router as admin_router  # type: ignore
        app.include_router(admin_router, prefix="/admin", tags=["admin"])
        app.state.features["wp04"]["admin"] = True
    except Exception:
        pass


def create_app() -> FastAPI:
    app = FastAPI(title="mindnet API", version="0.1.0")
    s = get_settings()

    @app.get("/healthz")
    def healthz():
        """Basis-Liveness-Check (unverändert)."""
        return {"status": "ok", "qdrant": s.QDRANT_URL, "prefix": s.COLLECTION_PREFIX}

    # Admin-Metadaten (WP-04, unverändert)
    @app.get("/admin/meta")
    def admin_meta():
        # Import lokal, damit fehlende Module nicht beim Start stören
        meta = {}
        try:
            import app.main as _m
            meta["main"] = getattr(_m, "__doc__", "").splitlines()[0:1]
        except Exception:
            pass
        try:
            import app.config as _c
            meta["config"] = {
                "QDRANT_URL": s.QDRANT_URL,
                "COLLECTION_PREFIX": s.COLLECTION_PREFIX,
                "VECTOR_SIZE": s.VECTOR_SIZE,
                "DISTANCE": s.DISTANCE,
                "MODEL_NAME": s.MODEL_NAME,
                "RETRIEVER": {
                    "W_SEM": getattr(s, "RETRIEVER_W_SEM", 0.70),
                    "W_EDGE": getattr(s, "RETRIEVER_W_EDGE", 0.25),
                    "W_CENT": getattr(s, "RETRIEVER_W_CENT", 0.05),
                    "TOP_K": getattr(s, "RETRIEVER_TOP_K", 10),
                    "EXPAND_DEPTH": getattr(s, "RETRIEVER_EXPAND_DEPTH", 1),
                },
            }
        except Exception:
            pass
        try:
            import app.core.qdrant_points as _qp
            meta["qdrant_points"] = getattr(_qp, "__doc__", "").splitlines()[0:1]
        except Exception:
            pass
        return {"meta": meta}

    # NEU: Features-/Readiness-Ansicht (rein ergänzend)
    @app.get("/admin/features")
    def admin_features():
        """
        Liefert die dynamisch gesetzten Feature-Flags für WP-04 Router
        (graph/query/admin), ohne bestehende Endpunkte zu beeinflussen.
        """
        features = getattr(app.state, "features", {})
        return {"features": features}

    # Bestehende Router (unverändert)
    app.include_router(embed_router)
    app.include_router(qdrant_router)

    # WP-04 Router ggf. dynamisch einbinden
    _maybe_include_wp04(app)
    return app


app = create_app()