from django.contrib.auth import get_user_model
from django.shortcuts import get_object_or_404, render
from django.urls import reverse
from django.utils.translation import ugettext as _

from misago.core.exceptions import Banned
from misago.users.bans import get_user_ban
from misago.users.decorators import deny_banned_ips
from misago.users.tokens import is_password_change_token_valid


def reset_view(f):
    @deny_banned_ips
    def decorator(*args, **kwargs):
        return f(*args, **kwargs)
    return decorator


@reset_view
def request_reset(request):
    request.frontend_context.update({
        'SEND_PASSWORD_RESET_API': reverse('misago:api:send-password-form'),
    })
    return render(request, 'misago/forgottenpassword/request.html')


class ResetError(Exception):
    pass


@reset_view
def reset_password_form(request, pk, token):
    requesting_user = get_object_or_404(get_user_model(), pk=pk)

    try:
        if (request.user.is_authenticated and
                request.user.id != requesting_user.id):
            message = _("%(user)s, your link has expired. "
                        "Please request new link and try again.")
            message = message % {'user': requesting_user.username}
            raise ResetError(message)

        if not is_password_change_token_valid(requesting_user, token):
            message = _("%(user)s, your link is invalid. "
                        "Please try again or request new link.")
            message = message % {'user': requesting_user.username}
            raise ResetError(message)

        ban = get_user_ban(requesting_user)
        if ban:
            raise Banned(ban)
    except ResetError as e:
        return render(request, 'misago/forgottenpassword/error.html', {
            'message': e.args[0],
        }, status=400)

    api_url = reverse('misago:api:change-forgotten-password', kwargs={
        'pk': pk,
        'token': token,
    })

    request.frontend_context['CHANGE_PASSWORD_API'] = api_url
    return render(request, 'misago/forgottenpassword/form.html')