import os
import logging
from datetime import datetime
import asyncio

from quart import Quart, url_for, jsonify, render_template, session
from quart_session_openid import OpenID
from quart_session import Session
import settings


app: Quart = None
peewee = None
cache = None
openid: OpenID = None


async def _setup_database(app: Quart):
    import peewee
    import yellow.models
    models = peewee.Model.__subclasses__()
    for m in models:
        m.create_table()


async def _setup_openid(app: Quart):
    global openid
    openid = OpenID(app, **settings.OPENID_CFG)
    from yellow.auth import handle_user_login


async def _setup_cache(app: Quart):
    global cache
    app.config['SESSION_TYPE'] = 'redis'
    app.config['SESSION_URI'] = settings.REDIS_URI
    Session(app)


async def _setup_error_handlers(app: Quart):
    @app.errorhandler(500)
    async def page_error(e):
        return await render_template('error.html', code=500, msg="Error occurred"), 500

    @app.errorhandler(403)
    async def page_forbidden(e):
        return await render_template('error.html', code=403, msg="Forbidden"), 403

    @app.errorhandler(404)
    async def page_not_found(e):
        return await render_template('error.html', code=404, msg="Page not found"), 404


def create_app():
    global app
    app = Quart(__name__)

    app.logger.setLevel(logging.INFO)
    app.secret_key = settings.APP_SECRET

    @app.context_processor
    def template_variables():
        global openid
        from yellow.models import User
        current_user = session.get('user')
        if current_user:
            current_user = User(**current_user)
        now = datetime.now()
        return dict(user=current_user, url_login=openid.endpoint_name_login, year=now.year)

    @app.before_serving
    async def startup():
        await _setup_cache(app)
        await _setup_openid(app)
        await _setup_database(app)
        await _setup_error_handlers(app)

        from yellow.routes import bp_routes
        from yellow.api import bp_api
        app.register_blueprint(bp_routes)
        app.register_blueprint(bp_api)

    return app