import os

class Config:
    """Configuration settings for Attendr Smart Attendance System"""
    
    # Flask settings
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'dev-secret-key-change-in-production'
    
    # Session settings for proxy (Hugging Face)
    SESSION_COOKIE_SECURE = True
    SESSION_COOKIE_SAMESITE = 'None'
    SESSION_COOKIE_HTTPONLY = True
    PERMANENT_SESSION_LIFETIME = 3600 # 1 hour
    
    # Database settings
    BASE_DIR = os.path.abspath(os.path.dirname(__file__))
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or \
        'sqlite:///' + os.path.join(BASE_DIR, 'attendr.db')
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    
    # Upload folder settings
    UPLOAD_FOLDER = os.path.join(BASE_DIR, 'uploads')
    FACE_ENCODINGS_FOLDER = os.path.join(UPLOAD_FOLDER, 'face_encodings')
    MAX_CONTENT_LENGTH = 16 * 1024 * 1024  # 16MB max file size
    
    # Face recognition settings
    FACE_RECOGNITION_TOLERANCE = 0.6  # Lower = more strict (0.6 is default)
    FACE_DETECTION_MODEL = 'hog'  # 'hog' is faster, 'cnn' is more accurate
    
    # Geolocation settings
    GEOLOCATION_RADIUS_METERS = 2000  # Increased to 2000m as requested for testing
    
    # Attendance Code Settings
    CODE_LENGTH = 6  # Length of attendance code
    CODE_REFRESH_INTERVAL = 10  # Code refresh interval in seconds (10 seconds for demo)
    
    # Session Settings
    SESSION_DURATION_HOURS = 3  # Default session duration
    
    @staticmethod
    def init_app(app):
        """Initialize application with config"""
        # Create upload folders if they don't exist
        os.makedirs(Config.UPLOAD_FOLDER, exist_ok=True)
        os.makedirs(Config.FACE_ENCODINGS_FOLDER, exist_ok=True)