from django import forms
from django.contrib.auth import login, logout, authenticate

class UserLoginForm(forms.Form):
    username = forms.CharField()
    password = forms.CharField(widget=forms.PasswordInput())

    def clean(self):
        cleaned_data = self.cleaned_data
        username = cleaned_data.get('username')
        password = cleaned_data.get('password')
        if username is None or password is  None:
            raise forms.ValidationError("Invalid username or password")
        user = authenticate(username=username, password=password)
        if not user:
            raise forms.ValidationError("Invalid username or password")
        if not user.is_active:
            raise forms.ValidationError("User is blocked")
        cleaned_data['user'] = user
        return cleaned_data