from urllib.parse import quote_plus
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base
import os

# ---- Environment variables (from Coolify or .env) ----
DB_USER = os.getenv("DB_USER", "postgres")
DB_PASSWORD = quote_plus(os.getenv("DB_PASSWORD", ""))
DB_HOST = os.getenv("DB_HOST", "localhost")
DB_PORT = os.getenv("DB_PORT", "5432")
DB_NAME = os.getenv("DB_NAME", "postgres")

# ---- Database URL ----
DATABASE_URL = f"postgresql+psycopg2://{DB_USER}:{DB_PASSWORD}@{DB_HOST}:{DB_PORT}/{DB_NAME}"

# ---- SQLAlchemy setup ----
engine = create_engine(DATABASE_URL, pool_pre_ping=True)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

# ---- Dependency helper for FastAPI ----
def get_db():
    """
    FastAPI dependency that yields a database session and ensures it's closed after use.
    """
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()