"""
Persistenter System-Standard für die Produkt-Übersicht (Dashboard).

Key in system_config: dashboard_product_default — gültiges DashboardLayoutPayload (JSON).
"""
from __future__ import annotations

from typing import Any

from psycopg2.extras import Json

from dashboard_layout_schema import DashboardLayoutPayload, product_default_layout_dict
from db import get_cursor

SYSTEM_CONFIG_KEY_DASHBOARD_PRODUCT_DEFAULT = "dashboard_product_default"


def get_stored_product_default_validated(conn) -> dict[str, Any] | None:
    """Gültiges Layout aus DB oder None (fehlt/ungültig)."""
    cur = get_cursor(conn)
    cur.execute(
        "SELECT value FROM system_config WHERE key = %s",
        (SYSTEM_CONFIG_KEY_DASHBOARD_PRODUCT_DEFAULT,),
    )
    row = cur.fetchone()
    if not row or row.get("value") is None:
        return None
    raw = row["value"]
    if isinstance(raw, str):
        import json

        try:
            raw = json.loads(raw)
        except json.JSONDecodeError:
            return None
    if not isinstance(raw, dict):
        return None
    try:
        payload = DashboardLayoutPayload.model_validate(
            {"version": raw.get("version", 1), "widgets": raw.get("widgets", [])}
        )
        return payload.to_stored_dict()
    except Exception:
        return None


def get_product_default_base_dict(conn) -> dict[str, Any]:
    """Basis-Layout (ohne Entitlements): DB-Override oder Code-Standard."""
    stored = get_stored_product_default_validated(conn)
    if stored is not None:
        return stored
    return product_default_layout_dict()


def upsert_product_default_base(conn, layout: dict[str, Any]) -> dict[str, Any]:
    payload = DashboardLayoutPayload.model_validate(layout)
    stored = payload.to_stored_dict()
    cur = get_cursor(conn)
    cur.execute(
        """
        INSERT INTO system_config (key, value, updated_at)
        VALUES (%s, %s, CURRENT_TIMESTAMP)
        ON CONFLICT (key) DO UPDATE SET
            value = EXCLUDED.value,
            updated_at = CURRENT_TIMESTAMP
        """,
        (SYSTEM_CONFIG_KEY_DASHBOARD_PRODUCT_DEFAULT, Json(stored)),
    )
    return stored


def delete_product_default_override(conn) -> None:
    cur = get_cursor(conn)
    cur.execute(
        "DELETE FROM system_config WHERE key = %s",
        (SYSTEM_CONFIG_KEY_DASHBOARD_PRODUCT_DEFAULT,),
    )