import os

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

DB_USER = os.getenv("DB_USER", "nextgoal")
DB_PASSWORD = os.getenv("DB_PASSWORD", "nextgoal")
DB_HOST = os.getenv("DB_HOST", "db")
DB_PORT = os.getenv("DB_PORT", "3306")
DB_NAME = os.getenv("DB_NAME", "nextgoal")

DATABASE_URL = (
    f"mysql+pymysql://{DB_USER}:{DB_PASSWORD}@{DB_HOST}:{DB_PORT}/{DB_NAME}?charset=utf8mb4"
)

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()