"""The main application factory."""
from logging import DEBUG, ERROR, getLogger

from celery import Celery
from flask import Flask
from redis import Redis

from magic_app.config import Base, Production

celery = Celery(
    __name__, backend=Base.CELERY_RESULT_BACKEND, broker=Base.CELERY_BROKER_URL
)


def create_app(config=Production):
    """Main application factory."""
    app = Flask(__name__.split(".")[0])
    app.config.from_object(config)

    configure_celery(app)
    configure_redis(app)
    configure_views(app)
    configure_logging(app)

    return app


def configure_redis(app):
    """Configure Redis connection."""
    from magic_app.session import RedisSessionDB

    host = Base.REDIS_HOST
    port = Base.REDIS_PORT
    db_num = Base.REDIS_SESSION_DB

    if app.testing:
        from fakeredis import FakeRedis

        connection = FakeRedis()
    else:
        connection = Redis(host=host, port=port, db=db_num)

    app.config["SESSION"] = RedisSessionDB(connection)


def configure_celery(app):
    """Configure celery."""
    celery.conf.update(app.config)

    class ContextTask(celery.Task):
        def __call__(self, *args, **kwargs):
            with app.app_context():
                return self.run(*args, **kwargs)

    celery.Task = ContextTask


def configure_views(app):
    """Configure API resource views."""
    from magic_app.views import apps

    app.register_blueprint(apps)


def configure_logging(app):
    """Configure application logging."""
    app_logger = getLogger(__name__)

    if not app.debug:
        app_logger.setLevel(ERROR)
    else:
        app_logger.setLevel(DEBUG)

    app.logging = app_logger