import os

class Config:
    # Database connection - use environment variables
    MYSQL_USER = os.getenv('MYSQL_USER', 'root')
    MYSQL_PASSWORD = os.getenv('MYSQL_PASSWORD', '')
    MYSQL_HOST = os.getenv('MYSQL_HOST', 'localhost')
    MYSQL_PORT = os.getenv('MYSQL_PORT', '3306')
    MYSQL_DB = os.getenv('MYSQL_DB', 'car_rental')

    SQLALCHEMY_DATABASE_URI = os.getenv(
        'DATABASE_URL',
        f"mysql+pymysql://{MYSQL_USER}:{MYSQL_PASSWORD}@{MYSQL_HOST}:{MYSQL_PORT}/{MYSQL_DB}"
    )
    SQLALCHEMY_TRACK_MODIFICATIONS = False