"""Main application factory."""

from os import makedirs, pardir
from os.path import exists

from flask import Flask
from sqlalchemy.dialects import registry


def create_app(config):
    app = Flask(__name__.split('.')[0])

    app.config.from_object(config)

    configure_pyrqlite()
    configure_socketio(app)
    configure_sqlalchemy(app)
    configure_uploads(app)

    with app.app_context():
        from xppl import views  # noqa

    return app


def configure_pyrqlite():
    """Configure PyRQLite."""
    registry.register(
        'rqlite.pyrqlite',
        'sqlalchemy_rqlite.pyrqlite',
        'dialect'
    )


def configure_sqlalchemy(app):
    """Configure SQLAlchemy."""
    from xppl.database import db
    from xppl.models import (  # noqa
        Book, Author, Instance,
        Potential, UserIns, Chat,
        Stack,
    )

    db.init_app(app)

    with app.app_context():
        db.create_all()


def configure_socketio(app):
    """Configure SocketIO."""
    from xppl.socketio import socketio

    socketio.init_app(app)


def configure_uploads(app):
    """Setup the uploads folder."""
    upload_paths = [
        app.config['UPLOAD_FOLDER'],
        app.config['UPLOAD_FOLDER_COVER'],
    ]
    for path in upload_paths:
        if not exists(path):
            makedirs(path)