from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from urllib.parse import urlparse, unquote
import os

DATABASE_URL = os.environ.get("DATABASE_URL", "")

# Parse URL and pass credentials separately to avoid @ in password breaking URL
parsed = urlparse(DATABASE_URL)

engine = create_engine(
    DATABASE_URL,
    pool_pre_ping=True,
    pool_size=10,
    max_overflow=20,
    connect_args={
        "host": parsed.hostname,
        "port": parsed.port or 6543,
        "dbname": parsed.path.lstrip("/"),
        "user": parsed.username,
        "password": unquote(parsed.password or ""),
    },
)

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


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