import json
import os.path

from flask import Flask
from flask_pure import Pure
from flask_qrcode import QRcode

config_file = os.path.abspath("config.json")

pure = Pure()
qrcode = QRcode()


def create_app():

    app = Flask(__name__)

    if not hasattr(app.config, "from_json"):

        def from_json(file, silent=True):
            try:
                with open(file, encoding="utf-8") as json_file:
                    obj = json.load(json_file)
            except IOError:
                if silent:
                    return False
                raise

            for key in obj:
                if key.isupper():
                    app.config[key] = obj[key]

            return True

        app.config.from_json = from_json

    try:
        app.config.from_json(config_file)
    except FileNotFoundError:
        pass

    app.config["PURECSS_RESPONSIVE_GRIDS"] = True
    app.config["PURECSS_USE_CDN"] = False
    app.config["PURECSS_USE_MINIFIED"] = True
    pure.init_app(app)

    qrcode.init_app(app)

    app.config["SECRET_KEY"] = "foobar"

    from .views import root_page

    app.register_blueprint(root_page)

    return app


app = create_app()