"""Key-Value settings store with Redis projection."""
from __future__ import annotations

import json
from typing import Any

from sqlalchemy import JSON, String
from sqlalchemy.orm import Mapped, Session, mapped_column

from core.db import Base
from core.events import event_bus
from core.redis_client import redis_client


class Setting(Base):
    __tablename__ = "settings"

    key: Mapped[str] = mapped_column(String(128), primary_key=True)
    value: Mapped[dict] = mapped_column(JSON)


def get_setting(db: Session, key: str, default: Any = None) -> Any:
    row = db.get(Setting, key)
    return row.value.get("v") if row else default


def set_setting(db: Session, key: str, value: Any) -> None:
    row = db.get(Setting, key)
    if row:
        row.value = {"v": value}
    else:
        row = Setting(key=key, value={"v": value})
        db.add(row)
    db.commit()
    redis_client.set(f"setting:{key}", json.dumps(value))
    event_bus.publish("core.settings_updated", {"key": key, "value": value}, db=db)


def get_setting_cached(key: str, default: Any = None) -> Any:
    raw = redis_client.get(f"setting:{key}")
    if raw is None:
        return default
    return json.loads(raw)