from django import forms
from django.contrib.auth.forms import AuthenticationForm
from django.contrib.auth.models import User
from django.forms.widgets import PasswordInput, TextInput


class LoginForm(AuthenticationForm):
    username = forms.CharField(widget=TextInput(attrs={'class': 'form-control', 'placeholder': 'Username'}))
    password = forms.CharField(widget=PasswordInput(attrs={'class': 'form-control', 'placeholder': 'Password'}))

    def clean(self):
        username = self.cleaned_data.get('username')
        try:
            User.objects.get(username=username)
        except User.DoesNotExist:
            raise forms.ValidationError('Username does not exist')

        return super(LoginForm, self).clean()