from app.data import data
from app.models import Entry, Dataset, Test, User
from app.modules import bootstrap, csrf, db, login_manager, mail
from app.tools.data import save
from app.tools.logs import write
from config import Config

from flask import flash, Flask, render_template, request
from flask.helpers import url_for
from flask.json import jsonify
from flask_wtf.csrf import CSRFError
from sqlalchemy_utils import database_exists, create_database
from werkzeug.middleware.proxy_fix import ProxyFix

from cryptography.fernet import Fernet
from datetime import datetime
from os import mkdir, path

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):
        return User.query.filter_by(id=id).first()

    @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/' ] ]):
            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 app.admin.views import admin
    from app.api.views import api
    from app.quiz.views import quiz
    from app.views import views

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

    if not path.isdir(f'./{data}'): mkdir(f'./{data}')
    if not path.isdir(f'./{data}/questions'): mkdir(f'./{data}/questions')
    if not path.isfile(f'./{data}/.gitignore'):
        with open(f'./{data}/.gitignore', 'a+') as file: file.write(f'*')
    if not path.isfile(f'./{data}/config.json'): save({}, 'config.json')
    if not path.isdir(f'./{data}/logs'): mkdir(f'./{data}/logs')
    if not path.isfile(f'./{data}/logs/users.log'): write('users.log', 'Log file created.')
    if not path.isfile(f'./{data}/logs/system.log'): write('system.log', 'Log file created.')
    if not path.isfile(f'./{data}/logs/tests.log'): write('tests.log', 'Log file created.')
    if not database_exists(Config.SQLALCHEMY_DATABASE_URI):       
        create_database(Config.SQLALCHEMY_DATABASE_URI)
        write('system.log', 'No database found. Creating a new database.')
        with app.app_context(): db.create_all()
        write('system.log', 'Creating database schema.')
    if not path.isfile(f'./{data}/.encryption.key'):
        write('system.log', 'No encryption key found. Generating new encryption key.')
        with open(f'./{data}/.encryption.key', 'wb') as key_file:
            key = Fernet.generate_key()
            key_file.write(key)
    return app

app = create_app()

if __name__ == '__main__':
    app.run()