"""应用配置"""
import os
from pathlib import Path

BASE_DIR = Path(__file__).resolve().parent.parent


class Config:
    """基础配置"""
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'tech-blog-secret-key-change-in-production'
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or \
        f'sqlite:///{BASE_DIR / "data" / "techblog.db"}'
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    
    # 文章配置
    ARTICLES_PER_PAGE = 10
    ADMIN_ARTICLES_PER_PAGE = 20


class DevelopmentConfig(Config):
    """开发环境配置"""
    DEBUG = True


class ProductionConfig(Config):
    """生产环境配置"""
    DEBUG = False


config_map = {
    'development': DevelopmentConfig,
    'production': ProductionConfig,
    'default': DevelopmentConfig
}