"""
API: Katalog-Prompt-Slots (Stammdaten × Slot-Typ).

Globaler Admin-Katalog (wie catalogs.py) — require_auth + Admin-Rolle, kein TenantContext.
Eingetragen in backend/scripts/check_access_layer_hints.py EXEMPT_ROUTERS.
"""
from __future__ import annotations

from typing import Any, Dict, Optional

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field

from auth import require_auth
from catalog_prompt_slots import (
    CATALOG_KINDS,
    get_catalog_entry_slots,
    list_slot_type_definitions,
    upsert_catalog_entry_slots,
)
from db import get_cursor, get_db

router = APIRouter(prefix="/api", tags=["catalog_prompt_slots"])

_VALID_KINDS = frozenset(c.kind for c in CATALOG_KINDS)


class CatalogPromptSlotsBody(BaseModel):
    slots: Dict[str, Optional[str]] = Field(default_factory=dict)


def _require_admin(session: dict = Depends(require_auth)) -> dict:
    role = (session.get("role") or "").strip().lower()
    if role not in ("admin", "superadmin"):
        raise HTTPException(status_code=403, detail="Nur Admins")
    return session


def _slots_table_ready(cur) -> bool:
    cur.execute("SELECT to_regclass(%s)::text AS t", ("public.catalog_prompt_slots",))
    row = cur.fetchone()
    if not row:
        return False
    val = row.get("t") if isinstance(row, dict) else row[0]
    return val is not None and str(val).strip() != ""


@router.get("/catalog-prompt-slot-types")
def api_list_catalog_prompt_slot_types(session: dict = Depends(_require_admin)):
    with get_db() as conn:
        cur = get_cursor(conn)
        if not _slots_table_ready(cur):
            raise HTTPException(status_code=503, detail="Tabelle catalog_prompt_slots fehlt.")
        return {"slot_types": list_slot_type_definitions(cur)}


@router.get("/catalog-prompt-slots/{catalog_kind}/{catalog_id}")
def api_get_catalog_prompt_slots(
    catalog_kind: str,
    catalog_id: int,
    session: dict = Depends(_require_admin),
):
    kind = (catalog_kind or "").strip().lower()
    if kind not in _VALID_KINDS:
        raise HTTPException(status_code=400, detail=f"Unbekannter catalog_kind: {catalog_kind!r}")
    with get_db() as conn:
        cur = get_cursor(conn)
        if not _slots_table_ready(cur):
            raise HTTPException(status_code=503, detail="Tabelle catalog_prompt_slots fehlt.")
        try:
            return get_catalog_entry_slots(cur, kind, catalog_id)
        except LookupError as exc:
            raise HTTPException(status_code=404, detail=str(exc)) from exc
        except ValueError as exc:
            raise HTTPException(status_code=400, detail=str(exc)) from exc


@router.put("/catalog-prompt-slots/{catalog_kind}/{catalog_id}")
def api_put_catalog_prompt_slots(
    catalog_kind: str,
    catalog_id: int,
    body: CatalogPromptSlotsBody,
    session: dict = Depends(_require_admin),
):
    kind = (catalog_kind or "").strip().lower()
    if kind not in _VALID_KINDS:
        raise HTTPException(status_code=400, detail=f"Unbekannter catalog_kind: {catalog_kind!r}")
    with get_db() as conn:
        cur = get_cursor(conn)
        if not _slots_table_ready(cur):
            raise HTTPException(status_code=503, detail="Tabelle catalog_prompt_slots fehlt.")
        try:
            return upsert_catalog_entry_slots(cur, kind, catalog_id, body.slots or {})
        except LookupError as exc:
            raise HTTPException(status_code=404, detail=str(exc)) from exc
        except ValueError as exc:
            raise HTTPException(status_code=400, detail=str(exc)) from exc