"""
C-Stone Invoice Check — Datenbankkonfiguration
SQLAlchemy Engine und Session Management
"""

import os
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base
from dotenv import load_dotenv

# Load environment variables
load_dotenv()

DATABASE_URL = os.getenv(
    "DATABASE_URL",
    "postgresql://postgres:postgres@localhost:5432/invoice_check"
)

# Engine erstellen
engine = create_engine(
    DATABASE_URL,
    echo=False,  # SQL-Logging (False für Production)
    pool_pre_ping=True,  # Verbindungs-Check
    pool_size=10,
    max_overflow=20
)

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

# Base für Models
Base = declarative_base()

# Dependency für FastAPI
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()