from flask import Flask,session
from flask_mail import Mail
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager
from config import config
from flask_moment import Moment
from flask_bootstrap import Bootstrap
# 创建 Flask 应用对象 ；app
# 通过配置文件或环境变量加载应用配置；
# 初始化扩展对象，如数据库、邮件等；
# 注册蓝图（Blueprint）对象，将不同模块的视图函数注册到应用中；
# 返回 Flask 应用对象 。app
mail = Mail()
db = SQLAlchemy()
moment = Moment()
bootstrap=Bootstrap()
login_manager = LoginManager()
login_manager.login_view = 'auth.login'
def create_app(config_name):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    config[config_name].init_app(app)
    mail.init_app(app)    #将 Flask 应用程序与 Flask-Mail 扩展库绑定
    db.init_app(app)
    moment.init_app(app)
    login_manager.init_app(app)
    bootstrap.init_app(app)
    from .main import main as main_blueprint
    app.register_blueprint(main_blueprint)

    from .auth import auth as auth_blueprint
    app.register_blueprint(auth_blueprint)

    from .user import user as user_blueprint
    app.register_blueprint(user_blueprint)

    from .appointment import appointment as appointment_blueprint
    app.register_blueprint(appointment_blueprint)

    from .faqs import faqs as faqs_blueprint
    app.register_blueprint(faqs_blueprint)

    # from .detect import detect as detect_blueprint
    # app.register_blueprint(detect_blueprint)
    return app