def register(request):
    if request.method == "POST":
        first_name = request.POST['first_name']
        last_name = request.POST['last_name']
        last_name = request.POST['last_name']
        username = request.POST['username']
        email = request.POST['email']
        password = request.POST['password']
        password2 = request.POST['password2']
        if password == password2:
            if len(password) < 5:
                messages.error(
                    request, _('Your password is too small. Please use a stronger one.'))
                return redirect('register')
            if User.objects.filter(username=username).exists():
                messages.error(
                    request, _('Username is already taken. Please register again with new username.'))
                return redirect('register')
            if User.objects.filter(email=email).exists():
                messages.error(
                    request, _('Email: '+email+' is already registered. You can login with that email.'))
                return redirect('register')
            else:
                user = User.objects.create_user(
                    first_name=first_name, last_name=last_name, username=username, email=email, password=password)
                user.save()
                messages.success(
                    request, _('Your account has been created.You can log in now.'))
                return redirect('login')
        else:
            messages.error(request, _('Password didn\'t match!'))
            return redirect('register')

    else:
        return render(request, 'accounts/register.html')


def login(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = auth.authenticate(username=username, password=password)

        if user is not None:
            auth.login(request, user)
            messages.success(request, _('You are logged in now.'))
            return redirect('dashboard')
        else:
            messages.error(
                request, _('Your credentials didn\'t matched. Please use correct username and password.'))
            return redirect('login')
    else:
        return render(request, 'accounts/login.html')


def logout(request):
    auth.logout(request)
    messages.success(request, _('You have been logged out.'))
    return redirect('login')


@login_required
def edit_profile(request):
    if request.method == 'POST':
        user = User.objects.get(id=request.user.id)
        if request.POST.get('username') != request.user.username and User.objects.filter(username=request.POST.get('username')).exists():
            messages.error(request,_('User with same username already exists! Please choose unique username.'))
            return redirect('dashboard')
        user.first_name = request.POST.get(
            'first_name', request.user.first_name)
        user.last_name = request.POST.get('last_name', request.user.last_name)
        if request.POST['username']:
            saved_items = Save.objects.filter(username=user.username)
            for item in saved_items:
                item.username = request.POST['username']
                item.save()

        user.username = request.POST.get('username', request.user.username)
        user.email = request.POST.get('email', request.user.email)
        user.save()
        messages.success(request, _('Your profile is successfully updated.'))
        return redirect('dashboard')
    return redirect('login')


@login_required
def change_password(request):
    if request.method == 'POST':
        form = PasswordChangeForm(request.user, request.POST)
        if form.is_valid():
            user = form.save()
            update_session_auth_hash(request, user)  # Important!
            messages.success(
                request, _('Your password was successfully updated!'))
            return redirect('dashboard')
        else:
            messages.error(request, _('Please make sure all conditions are matched !'))
    else:
        form = PasswordChangeForm(request.user)
    return render(request, 'accounts/change_password.html', {
        'form': form
    })