import logging, os
from flask import Flask, request, current_app
from config import Config
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_login import LoginManager
from flask_mail import Mail
from logging.handlers import SMTPHandler, RotatingFileHandler
from flask_bootstrap import Bootstrap
from flask_moment import Moment
from flask_babel import Babel, lazy_gettext as _l
from elasticsearch import Elasticsearch

db = SQLAlchemy()
migrate = Migrate()
login = LoginManager()
login.login_view = 'auth.login'
login.login_message = 'Access restricted: Please login first.'
mail = Mail()
bootstrap = Bootstrap()
moment = Moment()
babel = Babel()

def create_app(config_class=Config):
    app = Flask(__name__)
    app.config.from_object(config_class)

    db.init_app(app)
    migrate.init_app(app, db)
    login.init_app(app)
    mail.init_app(app)
    bootstrap.init_app(app)
    moment.init_app(app)
    babel.init_app(app)

    # Register the errors blueprint to the app
    from app.errors import bp as errors_bp
    app.register_blueprint(errors_bp)

    # Register the auth blueprint to the app
    from app.auth import bp as auth_bp
    app.register_blueprint(auth_bp, url_prefix='/auth')

    # Register the main blueprint to the app
    from app.main import bp as main_bp
    app.register_blueprint(main_bp)

    # Elasticsearch instance
    app.elasticsearch = Elasticsearch([app.config['ELASTICSEARCH_URL']]) if app.config['ELASTICSEARCH_URL'] else None

    if not app.debug and not app.testing:
        # Only enable email logger if the email server configs info exists
        # TEST: (venv) python -m smtpd -n -c DebuggingServer localhost:8025
        if app.config['MAIL_SERVER']:
            auth = None
            if app.config['MAIL_USERNAME'] or app.config['MAIL_PASSWORD']:
                auth = (app.config['MAIL_USERNAME'], app.config['MAIL_PASSWORD'])
            secure = None
            if app.config['MAIL_USE_TLS']:
                secure = ()
            mail_handler = SMTPHandler(
                mailhost=(app.config['MAIL_SERVER'], app.config['MAIL_PORT']),
                fromaddr='no-reply@' + app.config['MAIL_SERVER'],
                toaddrs=app.config['ADMINS'], subject='Microblog Failure',
                credentials=auth, secure=secure)
            mail_handler.setLevel(logging.ERROR)
            app.logger.addHandler(mail_handler)

        if app.config['LOGS_TO_STDOUT']:
            # Heroku logs
            stream_handler = logging.StreamHandler()
            stream_handler.setLevel(logging.INFO)
            app.logger.addHandler(stream_handler)
        else:
            # Logging to a file
            if not os.path.exists('logs'):
                os.mkdir('logs')
            file_handler = RotatingFileHandler('logs/Microblog', 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)

        # Logging categories: DEBUG, INFO, WARNING, ERROR and CRITICAL
        app.logger.setLevel(logging.INFO)
        app.logger.info('Microblog startup')

    return app

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

from app import models
