import os
from datetime import timedelta


class Config:
    """基础配置类"""
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'dev-secret-key-change-in-production'

    # 数据库配置
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or 'sqlite:///kamaxitong.db'
    SQLALCHEMY_TRACK_MODIFICATIONS = False

    # SQLAlchemy 2.0 兼容性设置
    SQLALCHEMY_ENGINE_OPTIONS = {
        "future": True,
        "pool_pre_ping": True,
    }

    # 系统基本配置
    SITE_NAME = os.environ.get('SITE_NAME') or '软件授权管理系统'
    ADMIN_EMAIL = os.environ.get('ADMIN_EMAIL') or ''
    
    # 验证器配置
    AUTH_SECRET_KEY = os.environ.get('AUTH_SECRET_KEY') or 'auth-validator-secret-key'
    OFFLINE_CACHE_DAYS = int(os.environ.get('OFFLINE_CACHE_DAYS', 7))  # 离线缓存天数
    MAX_FAILED_ATTEMPTS = int(os.environ.get('MAX_FAILED_ATTEMPTS', 5))  # 最大失败次数
    LOCKOUT_MINUTES = int(os.environ.get('LOCKOUT_MINUTES', 10))  # 锁定时间(分钟)
    MAX_UNBIND_TIMES = int(os.environ.get('MAX_UNBIND_TIMES', 3))  # 最大解绑次数

    # 卡密配置
    LICENSE_KEY_LENGTH = int(os.environ.get('LICENSE_KEY_LENGTH', 32))  # 卡密长度
    LICENSE_KEY_PREFIX = os.environ.get('LICENSE_KEY_PREFIX', '')  # 卡密前缀
    TRIAL_PREFIX = os.environ.get('TRIAL_PREFIX') or 'TRIAL_'  # 试用卡密前缀

    # API配置
    API_VERSION = os.environ.get('API_VERSION') or 'v1'
    ITEMS_PER_PAGE = int(os.environ.get('ITEMS_PER_PAGE', 20))

    # 文件上传配置 - 增加到500MB
    MAX_CONTENT_LENGTH = int(os.environ.get('MAX_CONTENT_LENGTH', 500 * 1024 * 1024))  # 500MB
    UPLOAD_FOLDER = os.environ.get('UPLOAD_FOLDER') or 'static/uploads'

    # 会话配置
    PERMANENT_SESSION_LIFETIME = timedelta(hours=int(os.environ.get('SESSION_LIFETIME_HOURS', 24)))

    @staticmethod
    def init_app(app):
        """初始化应用配置"""
        pass

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

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

    @staticmethod
    def init_app(app):
        Config.init_app(app)

        # 生产环境日志配置
        import logging
        from logging.handlers import RotatingFileHandler

        if not app.debug:
            file_handler = RotatingFileHandler('logs/kamaxitong.log', maxBytes=10240, backupCount=10)
            file_handler.setFormatter(logging.Formatter(
                '%(asctime)s %(levelname)s: %(message)s [in %(pathname)s:%(lineno)d]'
            ))
            file_handler.setLevel(logging.INFO)
            app.logger.addHandler(file_handler)
            app.logger.setLevel(logging.INFO)
            app.logger.info('KaMiXiTong startup')

class TestingConfig(Config):
    """测试环境配置"""
    TESTING = True
    SQLALCHEMY_DATABASE_URI = 'sqlite:///:memory:'
    WTF_CSRF_ENABLED = False

# 配置字典
config = {
    'development': DevelopmentConfig,
    'production': ProductionConfig,
    'testing': TestingConfig,
    'default': DevelopmentConfig
}