from __future__ import unicode_literals

import warnings
import os

from django import forms
from django.conf import settings
from django.contrib.auth import authenticate
from django.contrib.auth.models import User
from django.db import models
from django.utils.html import escape
from django.utils.translation import ugettext_lazy as _

from common.widgets import EmailInput


class EmailAuthenticationForm(forms.Form):
    """
    A form to use email address authentication
    """
    email = forms.CharField(label=_('Email'), max_length=254,
        widget=EmailInput()
    )
    password = forms.CharField(label=_('Password'), widget=forms.PasswordInput)

    error_messages = {
        'invalid_login': _('Please enter a correct email and password. '
                           'Note that the password field is case-sensitive.'),
        'inactive': _('This account is inactive.'),
    }

    def __init__(self, request=None, *args, **kwargs):
        """
        The 'request' parameter is set for custom auth use by subclasses.
        The form data comes in via the standard 'data' kwarg.
        """
        self.request = request
        self.user_cache = None
        super(EmailAuthenticationForm, self).__init__(*args, **kwargs)

    def clean(self):
        email = self.cleaned_data.get('email')
        password = self.cleaned_data.get('password')

        if email and password:
            self.user_cache = authenticate(email=email, password=password)
            if self.user_cache is None:
                raise forms.ValidationError(
                    self.error_messages['invalid_login'],
                    code='invalid_login',
                )
            elif not self.user_cache.is_active:
                raise forms.ValidationError(
                    self.error_messages['inactive'],
                    code='inactive',
                )
        return self.cleaned_data

    def check_for_test_cookie(self):
        warnings.warn('check_for_test_cookie is deprecated; ensure your login '
                      'view is CSRF-protected.', DeprecationWarning)

    def get_user_id(self):
        if self.user_cache:
            return self.user_cache.id
        return None

    def get_user(self):
        return self.user_cache