import os
from datetime import timedelta

class Config:
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'blood-donation-app-secret-key-2024'
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or 'sqlite:///blood_donation.db'
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    JWT_SECRET_KEY = os.environ.get('JWT_SECRET_KEY') or 'blood-donation-jwt-secret'
    JWT_ACCESS_TOKEN_EXPIRES = timedelta(days=7)
    UPLOAD_FOLDER = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'static', 'certificates')
    MAX_CONTENT_LENGTH = 16 * 1024 * 1024