"""Database configuration for data service"""

from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
from sqlalchemy.orm import declarative_base
import structlog

from app.core.config import settings

logger = structlog.get_logger()

# Create async engine
engine = create_async_engine(
    settings.DATABASE_URL,
    echo=False,
    pool_pre_ping=True,
    pool_size=10,
    max_overflow=20
)

# Create async session factory
AsyncSessionLocal = async_sessionmaker(
    engine,
    class_=AsyncSession,
    expire_on_commit=False
)

# Base class for models
Base = declarative_base()

async def get_db() -> AsyncSession:
    """Get database session"""
    async with AsyncSessionLocal() as session:
        try:
            yield session
        finally:
            await session.close()

async def init_db():
    """Initialize database tables"""
    try:
        async with engine.begin() as conn:
            await conn.run_sync(Base.metadata.create_all)
        logger.info("Database initialized successfully")
    except Exception as e:
        logger.error("Failed to initialize database", error=str(e))
        raise