from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.orm import declarative_base

from dotenv import load_dotenv
import os

load_dotenv()

DATABASE_URL = (
    f"mysql+pymysql://"
    f"{os.getenv('DB_USER')}:"
    f"{os.getenv('DB_PASSWORD')}@"
    f"{os.getenv('DB_HOST')}:"
    f"{os.getenv('DB_PORT')}/"
    f"{os.getenv('DB_NAME')}"
)

engine = create_engine(
    DATABASE_URL,
    pool_pre_ping=True
)

SessionLocal = sessionmaker(
    autocommit=False,
    autoflush=False,
    bind=engine
)

Base = declarative_base()


def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()