from flask import Flask, request, session, make_response, redirect, url_for
from werkzeug.security import generate_password_hash, check_password_hash
from lernplattform import app, db
from lernplattform.models import User
import random
import string

def generate_random_string(length=8):
    characters = string.ascii_letters + string.digits
    random_string = ''.join(random.choice(characters) for _ in range(length))
    return random_string

class login():
    """
    A class for handling user login functionality.
    
    Attributes:
        user_name (str): The username to be checked for authentication.
    
    Methods:
        __init__(self, user_name=None): Initializes the login object with a given user name.
        check(user_name): A static method that checks if the provided user name is valid.
        login(self): Prints "Login" to indicate that the login method has been called.
    """
    def __init__(self, user_name=None, login_data=None):
        self.user_name = user_name  # Initialize the user name attribute for the login class

    def check_logged_in():
        if request.cookies.get('username') is None:
            session['logged_in'] = False
            session['username'] = 'Gast'
            return False  # Return False if the user name is not provided
        else:
            session['logged_in'] = True
            session['username'] = request.cookies.get('username')
            session['userid'] = request.cookies.get('userid')
            
            return True  # Otherwise, return True indicating a valid user name

    def login(login_data):
         # get password from db
            user = User.query.filter_by(username = login_data.get('username')).first()

            if user and check_password_hash(user.password, login_data.get('password')):
                if not user.email_check == "":
                    return False

                session['userid'] = user.id
                session['username'] = user.username
                session['logged_in'] = True

                if login_data['remember'] == 'on':
                    resp = make_response(redirect(url_for('index')))
                    resp.set_cookie('userid', user.id)
                    resp.set_cookie('username', user.username)

                return True
            else:
                return False
            
    def logout():
        resp = make_response(redirect(url_for('index')))
        resp.set_cookie('username', '', expires=0)
        resp.set_cookie('userid', '', expires=0)
        session['logged_in'] = False

        return resp

    def register(request):
        username = request.form.get('username')
        email = request.form.get('email')
        password = request.form.get('password')
        hashed_password = generate_password_hash(password, method='pbkdf2:sha256')

        if User.query.filter_by(username = username).first():
            return False   # Return False if the user name is already in use
        else:
            random_string = generate_random_string()
            user = User(username = username, email = email, password = hashed_password, email_check = random_string)
            db.session.add(user)
            db.session.commit()
            return True