import os

class Config:
    """Flask configuration class"""
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'dev-secret-key-change-in-production'
    DEBUG = os.environ.get('FLASK_DEBUG', 'True').lower() == 'true'
    
    # Database configuration (for future use)
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or 'sqlite:///app.db'
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    
    # Mail configuration (for future use)
    MAIL_SERVER = os.environ.get('MAIL_SERVER')
    MAIL_PORT = int(os.environ.get('MAIL_PORT') or 587)
    MAIL_USE_TLS = os.environ.get('MAIL_USE_TLS', 'true').lower() in ['true', 'on', '1']
    MAIL_USERNAME = os.environ.get('MAIL_USERNAME')
    MAIL_PASSWORD = os.environ.get('MAIL_PASSWORD')
    
    # File upload configuration
    MAX_CONTENT_LENGTH = int(os.environ.get('MAX_FILE_SIZE', 16 * 1024 * 1024))  # 16MB default
    UPLOAD_FOLDER = '/tmp'
    ALLOWED_EXTENSIONS = {'txt'}
    
    # Remote server configuration for SCP
    REMOTE_HOST = os.environ.get('REMOTE_HOST') or 'example.com'
    REMOTE_USER = os.environ.get('REMOTE_USER') or 'user'
    REMOTE_PATH = os.environ.get('REMOTE_PATH') or '/home/user/uploads/'
    REMOTE_PORT = int(os.environ.get('REMOTE_PORT', 22))
    REMOTE_PRIVATE_KEY = os.environ.get('REMOTE_PRIVATE_KEY')  # Path to SSH private key file
    SCP_ENABLED = os.environ.get('SCP_ENABLED', 'false').lower() == 'true'
    
    # Basic authentication credentials - multiple users support
    # Environment variable format: "user1:pass1,user2:pass2"
    BASIC_AUTH_USERS_STR = os.environ.get('BASIC_AUTH_USERS', '')

    # Parse users string into dictionary
    BASIC_AUTH_USERS = {}
    for user_pass in BASIC_AUTH_USERS_STR.split(','):
        if ':' in user_pass:
            username, password = user_pass.strip().split(':', 1)
            BASIC_AUTH_USERS[username.strip()] = password.strip()