from django.core.urlresolvers import reverse
from django.shortcuts import redirect
from django.template import RequestContext
from django.utils import timezone
from django.utils.translation import ugettext as _
from misago.acl.exceptions import ACLError403, ACLError404
from misago.apps.errors import error403, error404
from misago.messages import Message
from misago.models import Forum, Thread, Post
from misago.utils.pagination import make_pagination
from misago.apps.threads.views.base import BaseView

class DeleteView(BaseView):
    def fetch_thread(self, kwargs):
        self.thread = Thread.objects.get(pk=kwargs['thread'])
        self.forum = self.thread.forum
        self.request.acl.forums.allow_forum_view(self.forum)
        self.request.acl.threads.allow_thread_view(self.request.user, self.thread)
        if self.mode in ['tread_delete', 'hide_thread']:
            self.request.acl.threads.allow_delete_thread(
                                                         self.request.user,
                                                         self.forum,
                                                         self.thread,
                                                         self.thread.start_post,
                                                         self.mode == 'delete_thread')
            # Assert we are not user trying to delete thread with replies
            acl = self.request.acl.threads.get_role(self.thread.forum_id)
            if not acl['can_delete_threads']:
                if self.thread.post_set.exclude(user_id=self.request.user.id).count() > 0:
                    raise ACLError403(_("Somebody has already replied to this thread. You cannot delete it."))

    def fetch_post(self, kwargs):
        self.post = self.thread.post_set.get(pk=kwargs['post'])
        if self.post.pk == self.thread.start_post_id:
            raise Post.DoesNotExist()
        self.request.acl.threads.allow_post_view(self.request.user, self.thread, self.post)
        self.request.acl.threads.allow_delete_post(
                                                   self.request.user,
                                                   self.forum,
                                                   self.thread,
                                                   self.post,
                                                   self.mode == 'delete_post')
        acl = self.request.acl.threads.get_role(self.thread.forum_id)
        if not acl['can_delete_posts'] and self.thread.post_set.filter(id__gt=self.post.pk).count() > 0:
            raise ACLError403(_("Somebody has already replied to this post, you cannot delete it."))

    def __call__(self, request, **kwargs):
        self.request = request
        self.mode = kwargs['mode']
        try:
            if not request.user.is_authenticated():
                raise ACLError403(_("Guest, you have to sign-in in order to be able to delete replies."))
            self.fetch_thread(kwargs)
            if self.mode in ['hide_post', 'delete_post']:
                self.fetch_post(kwargs)
        except (Thread.DoesNotExist, Post.DoesNotExist):
            return error404(self.request)
        except ACLError403 as e:
            return error403(request, e.message)
        except ACLError404 as e:
            return error404(request, e.message)

        if self.mode == 'delete_thread':
            self.thread.delete()
            self.forum.sync()
            self.forum.save(force_update=True)
            request.messages.set_flash(Message(_('Thread "%(thread)s" has been deleted.') % {'thread': self.thread.name}), 'success', 'threads')
            return redirect(reverse('forum', kwargs={'forum': self.thread.forum.pk, 'slug': self.thread.forum.slug}))

        if self.mode == 'hide_thread':
            self.thread.start_post.deleted = True
            self.thread.start_post.save(force_update=True)
            self.thread.last_post.set_checkpoint(request, 'deleted')
            self.thread.last_post.save(force_update=True)
            self.thread.sync()
            self.thread.save(force_update=True)
            self.forum.sync()
            self.forum.save(force_update=True)
            request.messages.set_flash(Message(_('Thread "%(thread)s" has been deleted.') % {'thread': self.thread.name}), 'success', 'threads')
            if request.acl.threads.can_see_deleted_threads(self.thread.forum):
                return redirect(reverse('thread', kwargs={'thread': self.thread.pk, 'slug': self.thread.slug}))
            return redirect(reverse('forum', kwargs={'forum': self.thread.forum.pk, 'slug': self.thread.forum.slug}))

        if self.mode == 'delete_post':
            self.post.delete()
            self.thread.sync()
            self.thread.save(force_update=True)
            self.forum.sync()
            self.forum.save(force_update=True)
            request.messages.set_flash(Message(_("Selected Reply has been deleted.")), 'success', 'threads')
            return redirect(reverse('thread', kwargs={'thread': self.thread.pk, 'slug': self.thread.slug}))

        if self.mode == 'hide_post':
            self.post.deleted = True
            self.post.edit_date = timezone.now()
            self.post.edit_user = request.user
            self.post.edit_user_name = request.user.username
            self.post.edit_user_slug = request.user.username_slug
            self.post.save(force_update=True)
            self.thread.sync()
            self.thread.save(force_update=True)
            self.forum.sync()
            self.forum.save(force_update=True)
            request.messages.set_flash(Message(_("Selected Reply has been deleted.")), 'success', 'threads_%s' % self.post.pk)
            return self.redirect_to_post(self.post)