import configparser
import logging
import sys
from os import environ
from flask import Flask
from . import twitch


logger = logging.getLogger(__name__)
blueprints = {
    "twitch": twitch,
}


def create_app():
    """Read the app configuration and instantiate service blueprints."""
    debug = environ.get("FLASK_ENV", "production") == "development"
    level = logging.DEBUG if debug else logging.INFO
    logging.basicConfig(level=level)

    config_path = environ.get("FEEDLEWARE_CONFIG")

    if not config_path:
        print(
            "Please set the FEEDLEWARE_CONFIG environment variable",
            file=sys.stderr,
        )
        sys.exit(1)

    config = configparser.ConfigParser()
    config.read(config_path)
    app = Flask(__name__)

    for section in config.sections():
        if section in blueprints:
            blueprint = blueprints[section].create_blueprint(config[section])
            app.register_blueprint(blueprint, url_prefix="/" + section)
        else:
            logger.warning("Unknown service '%s'", section)

    return app