from django.contrib.auth.models import User

from django.contrib.auth import authenticate

from django.contrib.sites.models import Site

from django.template import Context, loader

from django.core import validators

from django import oldforms

from django.utils.translation import ugettext as _

class UserCreationForm(oldforms.Manipulator):

    "A form that creates a user, with no privileges, from the given username and password."

    def __init__(self):

        self.fields = (

            oldforms.TextField(field_name='username', length=30, max_length=30, is_required=True,

                validator_list=[validators.isAlphaNumeric, self.isValidUsername]),

            oldforms.PasswordField(field_name='password1', length=30, max_length=60, is_required=True),

            oldforms.PasswordField(field_name='password2', length=30, max_length=60, is_required=True,

                validator_list=[validators.AlwaysMatchesOtherField('password1', _("The two password fields didn't match."))]),

        )

    def isValidUsername(self, field_data, all_data):

        try:

            User.objects.get(username=field_data)

        except User.DoesNotExist:

            return

        raise validators.ValidationError, _('A user with that username already exists.')

    def save(self, new_data):

        "Creates the user."

        return User.objects.create_user(new_data['username'], '', new_data['password1'])

class AuthenticationForm(oldforms.Manipulator):

    """

    Base class for authenticating users. Extend this to get a form that accepts

    username/password logins.

    """

    def __init__(self, request=None):

        """

        If request is passed in, the manipulator will validate that cookies are

        enabled. Note that the request (a HttpRequest object) must have set a

        cookie with the key TEST_COOKIE_NAME and value TEST_COOKIE_VALUE before

        running this validator.

        """

        self.request = request

        self.fields = [

            oldforms.TextField(field_name="username", length=15, max_length=30, is_required=True,

                validator_list=[self.isValidUser, self.hasCookiesEnabled]),

            oldforms.PasswordField(field_name="password", length=15, max_length=30, is_required=True),

        ]

        self.user_cache = None

    def hasCookiesEnabled(self, field_data, all_data):

        if self.request and not self.request.session.test_cookie_worked():

            raise validators.ValidationError, _("Your Web browser doesn't appear to have cookies enabled. Cookies are required for logging in.")

    def isValidUser(self, field_data, all_data):

        username = field_data

        password = all_data.get('password', None)

        self.user_cache = authenticate(username=username, password=password)

        if self.user_cache is None:

            raise validators.ValidationError, _("Please enter a correct username and password. Note that both fields are case-sensitive.")

        elif not self.user_cache.is_active:

            raise validators.ValidationError, _("This account is inactive.")

    def get_user_id(self):

        if self.user_cache:

            return self.user_cache.id

        return None

    def get_user(self):

        return self.user_cache

class PasswordResetForm(oldforms.Manipulator):

    "A form that lets a user request a password reset"

    def __init__(self):

        self.fields = (

            oldforms.EmailField(field_name="email", length=40, is_required=True,

                validator_list=[self.isValidUserEmail]),

        )

    def isValidUserEmail(self, new_data, all_data):

        "Validates that a user exists with the given e-mail address"

        self.users_cache = list(User.objects.filter(email__iexact=new_data))

        if len(self.users_cache) == 0:

            raise validators.ValidationError, _("That e-mail address doesn't have an associated user account. Are you sure you've registered?")

    def save(self, domain_override=None, email_template_name='registration/password_reset_email.html'):

        "Calculates a new password randomly and sends it to the user"

        from django.core.mail import send_mail

        for user in self.users_cache:

            new_pass = User.objects.make_random_password()

            user.set_password(new_pass)

            user.save()

            if not domain_override:

                current_site = Site.objects.get_current()

                site_name = current_site.name

                domain = current_site.domain

            else:

                site_name = domain = domain_override

            t = loader.get_template(email_template_name)

            c = {

                'new_password': new_pass,

                'email': user.email,

                'domain': domain,

                'site_name': site_name,

                'user': user,

                }

            send_mail(_('Password reset on %s') % site_name, t.render(Context(c)), None, [user.email])

class PasswordChangeForm(oldforms.Manipulator):

    "A form that lets a user change his password."

    def __init__(self, user):

        self.user = user

        self.fields = (

            oldforms.PasswordField(field_name="old_password", length=30, max_length=30, is_required=True,

                validator_list=[self.isValidOldPassword]),

            oldforms.PasswordField(field_name="new_password1", length=30, max_length=30, is_required=True,

                validator_list=[validators.AlwaysMatchesOtherField('new_password2', _("The two 'new password' fields didn't match."))]),

            oldforms.PasswordField(field_name="new_password2", length=30, max_length=30, is_required=True),

        )

    def isValidOldPassword(self, new_data, all_data):

        "Validates that the old_password field is correct."

        if not self.user.check_password(new_data):

            raise validators.ValidationError, _("Your old password was entered incorrectly. Please enter it again.")

    def save(self, new_data):

        "Saves the new password."

        self.user.set_password(new_data['new_password1'])

        self.user.save()

class AdminPasswordChangeForm(oldforms.Manipulator):

    "A form used to change the password of a user in the admin interface."

    def __init__(self, user):

        self.user = user

        self.fields = (

            oldforms.PasswordField(field_name='password1', length=30, max_length=60, is_required=True),

            oldforms.PasswordField(field_name='password2', length=30, max_length=60, is_required=True,

                validator_list=[validators.AlwaysMatchesOtherField('password1', _("The two password fields didn't match."))]),

        )

    def save(self, new_data):

        "Saves the new password."

        self.user.set_password(new_data['password1'])

        self.user.save()