from datetime import datetime

from flask import Flask, flash, request, render_template
from flask.helpers import url_for
from flask.json import jsonify
from flask_bootstrap import Bootstrap
from pymongo import MongoClient
from pymongo.errors import ConnectionFailure
from flask_wtf.csrf import CSRFProtect, CSRFError
from flask_mail import Mail

from common.security import check_keyfile_exists, generate_keyfile
import config

def create_app():
    app = Flask(__name__)
    app.config.from_object(config.TestingConfig())

    from common.blueprints import cookie_consent

    from admin.views import views as admin_views
    from admin.auth import auth as admin_auth
    from admin.results import results
    from quiz.views import views as quiz_views

    app.register_blueprint(quiz_views, url_prefix = '/')
    app.register_blueprint(admin_views, url_prefix = '/admin/')
    app.register_blueprint(admin_auth, url_prefix = '/admin/')
    app.register_blueprint(results, url_prefix = '/admin/results/')

    app.register_blueprint(cookie_consent, url_prefix = '/cookies/')

    @app.before_request
    def check_cookie_consent():
        if request.cookies.get('cookie_consent') == 'True':
            return
        if any([ request.path.startswith(x) for x in [ '/admin/static/', '/static/', '/cookies/' ] ]):
            return
        flash(f'<strong>Cookie Consent</strong>: This web site only stores minimal, functional cookies. By using this site, you consent to this use of cookies. For more information, see our <a href="{url_for("quiz_views.privacy")}">privacy policy</a>.', 'cookie_alert')
            
    from admin.views import check_login, get_user_from_db, get_id_from_cookie

    @app.context_processor
    def inject_now():
        return {'now': datetime.utcnow()}
    
    @app.context_processor
    def _check_login():
        return dict(check_login = check_login)

    @app.context_processor
    def _get_user_from_db():
        return dict(get_user_from_db = get_user_from_db)

    @app.context_processor
    def _get_id_from_cookie():
        return dict(get_id_from_cookie = get_id_from_cookie)

    @app.errorhandler(404)
    def _404_handler(e):
        return render_template('/quiz/404.html'), 404
    
    @app.errorhandler(CSRFError)
    def csrf_error_handler(error):
        return jsonify({ 'error': 'Could not validate a secure connection.'} ), 400

    if not check_keyfile_exists():
        generate_keyfile()

    Bootstrap(app)
    csrf = CSRFProtect(app)

    return app

app = create_app()
mongo = MongoClient(app.config['MONGO_URI'])
db = mongo[app.config['MONGO_INITDB_DATABASE']]
mail = Mail(app)

if __name__ == '__main__':
    app.run(host=app.config['APP_HOST'])