from django.contrib.auth.forms import (PasswordChangeForm,
                                       AdminPasswordChangeForm)
from django.contrib.auth.views import (logout as auth_logout,
                                       login as auth_login)
from django.contrib.auth import get_user_model
from django.core.urlresolvers import reverse, reverse_lazy
from django.http import HttpResponseRedirect
from django.utils.encoding import force_text
from django.utils.text import capfirst
from django.views import generic

import extra_views

from . import permissions, utils
from .forms import AdminAuthenticationForm
from .viewmixins import Admin2Mixin, AdminModel2Mixin, Admin2ModelFormMixin


class IndexView(Admin2Mixin, generic.TemplateView):
    default_template_name = "index.html"
    registry = None
    apps = None

    def get_context_data(self, **kwargs):
        data = super(IndexView, self).get_context_data(**kwargs)
        data.update({
            'apps': self.apps,
        })
        return data


class AppIndexView(Admin2Mixin, generic.TemplateView):
    default_template_name = "app_index.html"
    registry = None
    apps = None

    def get_context_data(self, **kwargs):
        data = super(AppIndexView, self).get_context_data(**kwargs)
        app_label = self.kwargs['app_label']
        registry = self.apps[app_label]

        data.update({
            'app_label': app_label,
            'registry': registry,
        })
        return data


class ModelListView(AdminModel2Mixin, generic.ListView):
    default_template_name = "model_list.html"
    permission_classes = (
        permissions.IsStaffPermission,
        permissions.ModelViewPermission)

    def post(self, request):
        action_name = request.POST['action']
        action_class = self.get_actions()[action_name]['action_class']
        selected_model_pks = request.POST.getlist('selected_model_pk')
        queryset = self.model.objects.filter(pk__in=selected_model_pks)
        response = action_class(request, queryset)()
        if response is None:
            return HttpResponseRedirect(self.get_success_url())
        else:
            return response

    def get_context_data(self, **kwargs):
        context = super(ModelListView, self).get_context_data(**kwargs)
        context['model'] = self.get_model()
        context['actions'] = self.get_actions().values()
        return context

    def get_success_url(self):
        view_name = 'admin2:{}_{}_index'.format(self.app_label, self.model_name)
        return reverse(view_name)

    def get_actions(self):
        return self.model_admin.get_list_actions()


class ModelDetailView(AdminModel2Mixin, generic.DetailView):
    default_template_name = "model_detail.html"
    permission_classes = (
        permissions.IsStaffPermission,
        permissions.ModelViewPermission)


class ModelEditFormView(AdminModel2Mixin, Admin2ModelFormMixin, extra_views.UpdateWithInlinesView):
    form_class = None
    default_template_name = "model_update_form.html"
    permission_classes = (
        permissions.IsStaffPermission,
        permissions.ModelChangePermission)

    def get_context_data(self, **kwargs):
        context = super(ModelEditFormView, self).get_context_data(**kwargs)
        context['model'] = self.get_model()
        context['action'] = "Change"
        return context


class ModelAddFormView(AdminModel2Mixin, Admin2ModelFormMixin, extra_views.CreateWithInlinesView):
    form_class = None
    default_template_name = "model_update_form.html"
    permission_classes = (
        permissions.IsStaffPermission,
        permissions.ModelAddPermission)

    def get_context_data(self, **kwargs):
        context = super(ModelAddFormView, self).get_context_data(**kwargs)
        context['model'] = self.get_model()
        context['action'] = "Add"
        return context


class ModelDeleteView(AdminModel2Mixin, generic.DeleteView):
    success_url = "../../"  # TODO - fix this!
    default_template_name = "model_confirm_delete.html"
    permission_classes = (
        permissions.IsStaffPermission,
        permissions.ModelDeletePermission)

    def get_context_data(self, **kwargs):
        context = super(ModelDeleteView, self).get_context_data(**kwargs)

        def _format_callback(obj):
            opts = utils.model_options(obj)
            return '%s: %s' % (force_text(capfirst(opts.verbose_name)),
                               force_text(obj))

        collector = utils.NestedObjects(using=None)
        collector.collect([self.get_object()])
        context.update({
            'deletable_objects': collector.nested(_format_callback)
        })
        return context


class PasswordChangeView(Admin2Mixin, generic.UpdateView):

    default_template_name = 'auth/password_change_form.html'
    form_class = AdminPasswordChangeForm
    admin_form_class = PasswordChangeForm
    model = get_user_model()
    success_url = reverse_lazy('admin2:password_change_done')

    def get_form_kwargs(self, **kwargs):
        data = {'user': self.get_object()}

        if self.request.method in ('POST', 'PUT'):
            data.update({
                'data': self.request.POST
            })

        return data

    def get_form_class(self):
        if self.request.user == self.get_object():
            return self.admin_form_class
        return super(PasswordChangeView, self).get_form_class()


class PasswordChangeDoneView(Admin2Mixin, generic.TemplateView):

    default_template_name = 'auth/password_change_done.html'


class LoginView(Admin2Mixin, generic.TemplateView):

    default_template_name = 'auth/login.html'
    authentication_form = AdminAuthenticationForm

    def dispatch(self, request, *args, **kwargs):
        return auth_login(request,
                          authentication_form=self.authentication_form,
                          template_name=self.get_template_names(),
                          *args, **kwargs)


class LogoutView(Admin2Mixin, generic.TemplateView):

    default_template_name = 'auth/logout.html'

    def get(self, request, *args, **kwargs):
        return auth_logout(request, template_name=self.get_template_names(),
                           *args, **kwargs)