#對整個應用做初始化操作
#主要工作：
# 1.構建Flask的應用以及各種配置
#2.構建SQLAlchemy的應用

from flask import Flask, g, request
from flask_sqlalchemy import SQLAlchemy
import pymysql
import eventlet
from flask_mqtt import Mqtt
from flask_migrate import Migrate
#from flask_migrate import Migrate, MigrateCommand
from flask_babel import Babel
# from werkzeug.wrappers import Request


#綠化(綠色線程)所有系統模組，實現IO多路複用
# eventlet.monkey_patch()

pymysql.install_as_MySQLdb()

# # db = SQLAlchemy()
# def register_i18n(app):
#     """Register i18n with the Flask application."""
#     defalut_language_str = app.config['DEFAULT_LANGUAGE']
#     support_language_list = app.config['SUPPORTED_LANGUAGES']

#     # 1. 取得子資料夾路徑 land_code
#     @app.url_value_preprocessor
#     def get_lang_code(endpoint, values):
#         if values is not None:
#             g.lang_code = values.pop('lang_code', defalut_language_str)

#     # 2. 確認 config 內包含 lang_code
#     @app.before_request
#     def ensure_lang_support():
#         lang_code = g.get('lang_code', None)
#         if lang_code and lang_code not in support_language_list:
#             g.lang_code = request.accept_languages.best_match(support_language_list)

#     # 3. 設定多語系
#     @app.localeselector
#     def get_locale():
#         return g.get('lang_code')

#     # 4. 確認在 1. pop lang_code 參數後的 lang_code 值
#     @app.url_defaults
#     def set_langrage_code(endpoint, values):
#         if 'lang_code' in values or not g.lang_code:
#             return
#         if app.url_map.is_endpoint_expecting(endpoint, 'lang_code'):
#             values['lang_code'] = g.lang_code


def create_app():
    app = Flask(__name__)
    #配置啟動模式為調適模式
    # app.config['DEBUG'] = True
    #配置數據庫的連接字符串
    #app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://coffee:skyeye@52.69.200.169:3306/Coffee'
    # app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:Gold@53743001@localhost:3306/Coffee'
    #app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:g53743001@localhost:3306/Coffee'
    app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:g53743001@localhost:3306/coffee'
    #app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://user:Gold@53743001@192.168.50.106:3306/CoffeeManage'
    #配置數據庫內容再更新時自動提交
    app.config['SQLALCHEMY_COMMIT_ON_TEARDOWN'] = True
    #配置session所需要的秘鑰
    app.config['SECRET_KEY'] = 'you guess'

    # template 有修改後，會自動去更新
    app.config['TEMPLATES_AUTO_RELOAD'] = True

    #如果设置成True(默认情况)，Flask - SQLAlchemy将会追踪对象的修改并且发送信号。这需要额外的内存， 如果不必要的可以禁用它
    #app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = True
    app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False

    #資料库连接池的大小。默认是数据库引擎的默认值 （通常是5）
    app.config['SQLALCHEMY_POOL_SIZE'] = 100

    #指定資料库连接池的超时时间。默认是 10
    # app.config['SQLALCHEMY_POOL_TIMEOUT'] = 60
    #app.config['SQLALCHEMY_POOL_TIMEOUT'] = 60 * 60
    app.config['SQLALCHEMY_POOL_TIMEOUT'] = 10

    #自动回收连接的秒数。这对 MySQL 是必须的，默认 情况下 MySQL 会自动移除闲置 8 小时或者以上的连接。
    #需要注意地是如果使用 MySQL 的话， Flask-SQLAlchemy 会自动地设置这个值为 2 小时
    #app.config['SQLALCHEMY_POOL_RECYCLE'] = 60 * 60 * 8
    app.config['SQLALCHEMY_POOL_RECYCLE'] = 1
    
    app.config['SQLALCHEMY_MAX_OVERFLOW'] = 15

    # app.config['SECRET'] = 'my secret key'

    #MQTT相關設置
    app.config['MQTT_BROKER_URL'] = '60.250.156.234'
    app.config['MQTT_BROKER_PORT'] = 1883
    app.config['MQTT_USERNAME'] = 'aisky-client'
    app.config['MQTT_PASSWORD'] = 'aiskyc'
    #將發送ping到代理的時間間隔設置60秒
    app.config['MQTT_KEEPALIVE'] = 60
    #出於測試目的將TLS設置為禁用
    app.config['MQTT_TLS_ENABLED'] = False

    #資料庫的初始化
    db = SQLAlchemy(app)
    db.init_app(app)
    mqtt = Mqtt(app)

    # 初始化Flask-Migrate擴展
    migrate = Migrate(app, db)

    app.config['BABEL_DEFAULT_LOCALE'] = 'zh'
    app.config['BABEL_DEFAULT_TIMEZONE'] = 'UTC'
    app.config['LANGUAGES'] = ['en', 'zh']

    babel = Babel(app)

    @babel.localeselector
    def get_locale():
        return request.accept_languages.best_match(app.config['LANGUAGES'])


    #將main藍圖程序與app關聯到一起
    from .main import main as main_blueprint
    app.register_blueprint(main_blueprint)
    #將user藍圖程序與app關聯到一起
    from .user import user as user_blueprint
    app.register_blueprint(user_blueprint)

    # Rita 將lang藍圖程序與app關聯到一起
    # from .main import main
    # app.register_blueprint(main, url_prefix='/<lang_code>')

    return app, db, mqtt