import os
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from dotenv import load_dotenv
from urllib.parse import quote
load_dotenv()


DB_USER = os.getenv("DB_USER")
DB_PASSWORD = quote(os.getenv("DB_PASSWORD"))
DB_NAME = os.getenv("DB_NAME")

DATABASE_URL = f"mysql+pymysql://{DB_USER}:{DB_PASSWORD}@localhost/{DB_NAME}"

engine = create_engine(
    DATABASE_URL,
    pool_size=10,         # Increase base pool size
    max_overflow=20,      # Allow additional overflow connections if needed
    pool_timeout=60,      # Wait time in seconds before timing out
    pool_recycle=1800,    # Recycle connections every 30 minutes to avoid stale connections
    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()