import os
from datetime import timedelta

class Config:
    """Base configuration"""
    # Flask
    SECRET_KEY = os.environ.get('SECRET_KEY') or os.urandom(24)
    
    # File Upload
    UPLOAD_FOLDER = 'static/uploads/'
    ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'webp'}
    MAX_CONTENT_LENGTH = 16 * 1024 * 1024  # 16 MB
    
    # Session
    PERMANENT_SESSION_LIFETIME = timedelta(hours=1)
    SESSION_COOKIE_SECURE = False
    SESSION_COOKIE_HTTPONLY = True
    SESSION_COOKIE_SAMESITE = 'Lax'
    
    # Model
    MODEL_NAME = "wambugu71/crop_leaf_diseases_vit"
    
    # Logging
    LOG_LEVEL = 'INFO'
    
class DevelopmentConfig(Config):
    """Development configuration"""
    DEBUG = True
    TESTING = False
    
class ProductionConfig(Config):
    """Production configuration"""
    DEBUG = False
    TESTING = False
    SESSION_COOKIE_SECURE = True
    
    # Rate limiting
    RATELIMIT_ENABLED = True
    RATELIMIT_DEFAULT = "100 per hour"
    
    # Security headers
    TALISMAN_FORCE_HTTPS = False  # Set to True if using HTTPS
    
class TestingConfig(Config):
    """Testing configuration"""
    DEBUG = True
    TESTING = True
    
# Configuration dictionary
config = {
    'development': DevelopmentConfig,
    'production': ProductionConfig,
    'testing': TestingConfig,
    'default': DevelopmentConfig
}

def get_config(env=None):
    """Get configuration based on environment"""
    if env is None:
        env = os.environ.get('FLASK_ENV', 'development')
    return config.get(env, config['default'])