def login(request):
    if request.method == "POST":
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(username=username, password=password)
        if user is not None: # check if user even exists
            if user.is_active: #i use active flag for paid users
                auth_login(request, user)
                return redirect('account') # successful login
        else:
            try:
                user = User.objects.get(username=username) # try to get user from username, if it succeses it means that the user exists
                context = ({
                    "message": "Wrong password. Maybe try once again?"
                        })
            except User.DoesNotExist: # welp, he doesnt
                context = ({
                    "message": "User doesn't exist. Maybe try <a class='error_link' href='/register/'>registering</a>?"
                        })
            return render(request, 'login.html', context)
    else: #initial view (first one is get submit only sens post)
        context = ({
            "message": ""
                })
        return render(request, 'login.html', context)