from flask import Flask, render_template, g
from werkzeug.exceptions import HTTPException

from flask_mobility import Mobility
from flask_session import Session

from . import filters
from .lib import OIDCAuthentication
import os

mobility = Mobility()

auth = OIDCAuthentication()
# SESSION_TYPE = 'filesystem'
sess = Session()


def create_app(environment='development'):

    from config import config

    # Instantiate app.
    app_prefix = os.getenv('APPLICATION_ROOT', '')
    app = Flask(__name__,
                static_url_path=f"{app_prefix}/static")

    # Set app config.
    env = os.environ.get('FLASK_ENV', environment)
    app.config.from_object(config[env])
    app.config.from_prefixed_env(prefix="HSMAN")
    config[env].configure(app)
    app.config['APP_TZ'] = os.environ.get('TZ', 'UTC')
    app.config['ADMIN_GROUPS'] = list(
        map(str.strip, app.config.get('ADMIN_GROUPS', "").split(',')))
    app.logger.debug(f"admin groups: {app.config['ADMIN_GROUPS']}")

    app.logger.info("middleware init: mobility")
    mobility.init_app(app)

    app.logger.info("middleware init: auth")
    auth.init_app(app)

    # Register blueprints.
    from .views import main_blueprint, rest_blueprint
    app.logger.info(f"register blueprint: 'main' [prefix '{
                    main_blueprint.url_prefix}']")
    app.register_blueprint(main_blueprint)

    app.logger.info(f"register blueprint: 'rest' [prefix '{
                    rest_blueprint.url_prefix}']")
    app.register_blueprint(rest_blueprint)

    app.logger.info("jinja2 custom filters loaded")
    filters.init_app(app)

    sess.init_app(app)

    # Error handlers.
    @app.errorhandler(HTTPException)
    def handle_http_error(exc):
        return render_template('error.html', error=exc), exc.code

    @app.context_processor
    def inject_auth():
        return dict(auth=auth)

    return app