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


def create_app(test_config=None):
    # Create and configure the Flask App
    app = Flask(__name__, instance_relative_config=True)
    app.config.from_mapping(
        SECRET_KEY="dev",
    )

    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

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

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