from .config import Production as Config
from .models import User
from .extensions import bootstrap, csrf, db, login_manager, mail
from .tools.logs import write

from flask import flash, Flask, render_template, request
from flask.helpers import abort, url_for
from flask.json import jsonify
from flask_wtf.csrf import CSRFError
from sqlalchemy.exc import SQLAlchemyError
from werkzeug.middleware.proxy_fix import ProxyFix

from datetime import datetime

def create_app():
    app = Flask(__name__)
    app.config.from_object(Config())
    app.wsgi_app = ProxyFix(app.wsgi_app, x_proto= 1, x_host= 1)

    bootstrap.init_app(app)
    csrf.init_app(app)
    db.init_app(app)
    login_manager.init_app(app)
    mail.init_app(app)

    login_manager.login_view = 'admin._login'
    @login_manager.user_loader
    def _load_user(id):
        try: return User.query.filter_by(id=id).first()
        except (SQLAlchemyError, ConnectionError) as exception:
            write('system.log', f'Database error when loading user fo login manager: {exception}')
            return abort(500)

    @app.before_request
    def _check_cookie_consent():
        if request.cookies.get('cookie_consent'):
            return
        if any([ request.path.startswith(x) for x in [ '/admin/static/', '/root/', '/quiz/static', '/cookies/', '/admin/editor/static', '/admin/view/static' ] ]):
            return
        flash(f'<strong>Cookie Consent</strong>: This web site only stores minimal, functional cookies. It does not store any tracking information. By using this site, you consent to this use of cookies. For more information, see our <a href="{url_for("views._privacy")}">privacy policy</a>.', 'cookie_alert')

    @app.errorhandler(404)
    def _404_handler(error): return render_template('404.html')
    @app.errorhandler(CSRFError)
    def _csrf_handler(): return jsonify({'error':'Could not validate a secure connection.'}), 403
    @app.context_processor
    def _now(): return {'now': datetime.now()}

    from .admin.views import admin
    from .api.views import api
    from .quiz.views import quiz
    from .views import views
    from .editor.views import editor
    from .view.views import view

    app.register_blueprint(admin, url_prefix='/admin')
    app.register_blueprint(api, url_prefix='/api')
    app.register_blueprint(views)
    app.register_blueprint(quiz)
    app.register_blueprint(editor, url_prefix='/admin/editor')
    app.register_blueprint(view, url_prefix='/admin/view')
    
    return app