import logging
from logging.handlers import RotatingFileHandler
import os
from flask import Flask
from flask_mail import Mail
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_login import LoginManager
from flask_moment import Moment
from config import Config

db = SQLAlchemy()
migrate = Migrate()
login = LoginManager()
login.login_view = 'auth.login'
login.login_message = 'Please log in to access this page.'
mail = Mail()
moment = Moment()


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)
    moment.init_app(app)

    from app.errors import bp as errors_bp
    app.register_blueprint(errors_bp)

    from app.auth import bp as auth_bp
    app.register_blueprint(auth_bp, url_prefix='/auth')

    from app.main import bp as main_bp
    from app.courses import bp as courses_bp
    from app.assignments import bp as assignments_bp
    from app.solutions import bp as solutions_bp
    from app.administration import bp as administration_bp

    app.register_blueprint(main_bp)
    app.register_blueprint(courses_bp)
    app.register_blueprint(assignments_bp)
    app.register_blueprint(solutions_bp)
    app.register_blueprint(administration_bp)

    if not app.debug and not app.testing:
        if not os.path.exists('logs'):
            os.mkdir('logs')
        file_handler = RotatingFileHandler('logs/pygrader.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('Pygrader startup')

    return app


from app import models
