from datetime import datetime

from sqlalchemy import DateTime, func
from sqlalchemy.ext.asyncio import AsyncAttrs, async_sessionmaker, create_async_engine
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column

from app.config import settings

engine = create_async_engine(settings.DATABASE_URL, echo=settings.DEBUG)
async_session = async_sessionmaker(engine, expire_on_commit=False)


class Base(AsyncAttrs, DeclarativeBase):
    pass


class TimestampMixin:
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )


async def init_database() -> None:
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)


async def close_database() -> None:
    await engine.dispose()