"""
Configuration settings for the application
"""

import os


class Config:
    """Base configuration class"""
    
    # Flask settings
    SECRET_KEY = os.environ.get('SECRET_KEY') or os.urandom(24)
    
    # Upload settings  
    UPLOAD_FOLDER = os.environ.get('UPLOAD_FOLDER') or 'static/uploads'
    MAX_CONTENT_LENGTH = 16 * 1024 * 1024  # 16MB max file size
    ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif'}
    
    # Authentication settings
    ADMIN_USERNAME = os.environ.get('ADMIN_USERNAME') or 'admin'
    ADMIN_PASSWORD = os.environ.get('ADMIN_PASSWORD') or 'password123'
    
    # Database settings
    DATABASE_PATH = os.environ.get('DATABASE_PATH') or 'pet_pictures.db'


class DevelopmentConfig(Config):
    """Development configuration"""
    DEBUG = True


class ProductionConfig(Config):
    """Production configuration"""
    DEBUG = False


class TestingConfig(Config):
    """Testing configuration"""
    TESTING = True
    DATABASE_PATH = ':memory:'