import os
from datetime import timedelta

class Config:
    # 基础配置
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'your-secret-key-here-change-in-production'
    
    # 数据库配置
    MYSQL_HOST = os.environ.get('MYSQL_HOST', '119.91.236.167')
    MYSQL_PORT = int(os.environ.get('MYSQL_PORT', 3306))
    MYSQL_USER = os.environ.get('MYSQL_USER', 'Language_learning')
    MYSQL_PASSWORD = os.environ.get('MYSQL_PASSWORD', 'cosyvoice')
    MYSQL_DB = os.environ.get('MYSQL_DB', 'language_learning')
    
    SQLALCHEMY_DATABASE_URI = f'mysql+pymysql://{MYSQL_USER}:{MYSQL_PASSWORD}@{MYSQL_HOST}:{MYSQL_PORT}/{MYSQL_DB}?charset=utf8mb4'
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    SQLALCHEMY_ENGINE_OPTIONS = {
        'pool_pre_ping': True,
        'pool_recycle': 300,
    }
    
    # 邮箱配置
    EMAIL_HOST = os.environ.get('EMAIL_HOST', 'smtp.qq.com')
    EMAIL_PORT = int(os.environ.get('EMAIL_PORT', 587))
    EMAIL_ENCRYPTION = os.environ.get('EMAIL_ENCRYPTION', 'starttls')
    EMAIL_USERNAME = os.environ.get('EMAIL_USERNAME', '3399560459@qq.com')
    EMAIL_PASSWORD = os.environ.get('EMAIL_PASSWORD', 'fzwhyirhbqdzcjgf')
    EMAIL_FROM = os.environ.get('EMAIL_FROM', '3399560459@qq.com')
    EMAIL_FROM_NAME = os.environ.get('EMAIL_FROM_NAME', 'BOOKSYSTEM_OFFICIAL')
    
    # Session配置
    PERMANENT_SESSION_LIFETIME = timedelta(hours=24)
    
    # 验证码配置
    VERIFICATION_CODE_EXPIRE_MINUTES = 5
    
    # 文件上传配置
    MAX_CONTENT_LENGTH = 100 * 1024 * 1024  # 100MB
    
class DevelopmentConfig(Config):
    DEBUG = True

class ProductionConfig(Config):
    DEBUG = False

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