import os

class Config:
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'dev-secret-key-change-in-production'
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or 'postgresql://postgres:password@localhost:5432/classrooms_db'
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    API_BASE_URL = os.environ.get('API_BASE_URL') or 'http://localhost:8080/api'
    
    # Pagination
    ITEMS_PER_PAGE = 20
    
    # Upload settings
    MAX_CONTENT_LENGTH = 16 * 1024 * 1024  # 16MB max file size
    UPLOAD_FOLDER = 'app/static/uploads'
    ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif'}
    
    # Internationalization
    LANGUAGES = ['en', 'es']
    BABEL_DEFAULT_LOCALE = 'en'
    BABEL_DEFAULT_TIMEZONE = 'UTC'
    BABEL_TRANSLATION_DIRECTORIES = 'translations'