"""The main app entrypoint"""

import logging
from flask import Flask, render_template
from flask_alembic import Alembic
from flask_bcrypt import Bcrypt
from flask_mail import Mail
from flask_sqlalchemy import SQLAlchemy
from flask_debugtoolbar import DebugToolbarExtension

alembic = Alembic()
bcrypt = Bcrypt()
mail = Mail()
db = SQLAlchemy()
toolbar = DebugToolbarExtension()


def create_app(**config):
    """create a flask instance and initialize plugins"""
    app = Flask(__name__)

    app.config.from_pyfile('config.py')
    app.config.from_pyfile('../instance/config.py', silent=True)
    app.config.from_mapping(config)
    if app.config['ENV'] == 'testing':  # pragma: no branch
        app.config['TESTING'] = True  # Flask-Mail needs this
        app.config.update(SQLALCHEMY_DATABASE_URI=app.config['TESTING_DB'])

    alembic.init_app(app)
    bcrypt.init_app(app)
    mail.init_app(app)
    db.init_app(app)
    toolbar.init_app(app)

    # register index page
    app.add_url_rule('/', 'index', lambda: render_template('index.html'))

    # register blueprints
    # pylint: disable=cyclic-import
    from .blueprints import BLUEPRINTS
    for blueprint in BLUEPRINTS:
        app.register_blueprint(blueprint)

    # register lifecycle methods
    from app.lifecycle import authenticate
    app.before_request(authenticate)

    # setup logging of 500 errors
    # pylint: disable=unused-argument
    def internal_error_handler(exc):  # pragma: no cover
        logger = logging.getLogger('app.errors')
        logger.exception('Internal Server Error')
        return '500 error', 500
    app.register_error_handler(500, internal_error_handler)

    return app