import os
from flask import Flask, send_from_directory
from . import prefix


def create_app(test_config=None):
    # create and configure the app
    app = Flask(__name__, instance_relative_config=True)
    app.config.from_mapping(
        SECRET_KEY='dev',
        DATABASE=os.path.join(app.instance_path, 'exquisite'),
    )

    if test_config is None:
        # load the instance config, if it exists, when not testing
        app.config.from_pyfile('config.py', silent=True)
    else:
        # load the test config if passed in
        app.config.from_mapping(test_config)

    # ensure the instance folder exists
    try:
        os.makedirs(app.instance_path)
    except OSError:
        pass

    from . import db
    db.init_app(app)

    @app.route("/favicon.ico")
    def favicon():
        return send_from_directory(
            os.path.join(app.root_path, "static"), "favicon.ico", mimetype="image/vnd.microsoft.icon",
        )

    from . import draw
    app.register_blueprint(draw.bp)

    from . import share
    app.register_blueprint(share.bp)

    from . import display
    app.register_blueprint(display.bp)

    from . import home
    app.register_blueprint(home.bp)

    app.wsgi_app = prefix.PrefixMiddleware(
        app.wsgi_app, prefix=os.environ.get("URL_PREFIX", ''))

    return app