from django.core.urlresolvers import reverse
from django.shortcuts import redirect
from django.utils import timezone
from django.utils.translation import ugettext as _
from misago import messages
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, Checkpoint
from misago.apps.threadtype.base import ViewBase

class DeleteHideBaseView(ViewBase):
    def set_context(self):
        pass

    def _set_context(self):
        self.thread = Thread.objects.get(pk=self.kwargs.get('thread'))
        self.forum = self.thread.forum
        self.proxy = Forum.objects.parents_aware_forum(self.forum)
        if self.forum.level:
            self.parents = Forum.objects.forum_parents(self.forum.pk)
        self.check_forum_type()
        self.request.acl.forums.allow_forum_view(self.forum)
        self.request.acl.threads.allow_thread_view(self.request.user, self.thread)

        if self.kwargs.get('post'):
            self.post = self.thread.post_set.get(id=self.kwargs.get('post'))
            self.request.acl.threads.allow_post_view(self.request.user, self.thread, self.post)

        if self.kwargs.get('checkpoint'):
            self.checkpoint = self.thread.checkpoint_set.get(id=self.kwargs.get('checkpoint'))
            self.request.acl.threads.allow_checkpoint_view(self.forum, self.checkpoint)

        self.set_context()

    def __call__(self, request, **kwargs):
        self.request = request
        self.kwargs = kwargs
        self.parents = []
        try:
            self._type_available()
            self._set_context()
            self._check_permissions()
            self.delete()
            self.message()
            return self.response()
        except (Forum.DoesNotExist, Thread.DoesNotExist, Post.DoesNotExist, Checkpoint.DoesNotExist):
            return error404(request)
        except ACLError403 as e:
            return error403(request, unicode(e))
        except ACLError404 as e:
            return error404(request, unicode(e))


class DeleteThreadBaseView(DeleteHideBaseView):
    def set_context(self):
        self.request.acl.threads.allow_delete_thread(self.request.user, self.proxy,
                                                     self.thread, self.thread.start_post, True)

    def delete(self):
        self.thread.delete()
        self.forum.sync()
        self.forum.save(force_update=True)

    def message(self):
        messages.success(self.request, _('Thread "%(thread)s" has been deleted.') % {'thread': self.thread.name}, 'threads')

    def response(self):
        return self.threads_list_redirect()


class HideThreadBaseView(DeleteHideBaseView):
    def set_context(self):
        self.request.acl.threads.allow_delete_thread(self.request.user, self.proxy,
                                                     self.thread, self.thread.start_post)
        # 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 delete(self):
        self.thread.start_post.deleted = True
        self.thread.start_post.save(force_update=True)
        self.thread.set_checkpoint(self.request, 'deleted')
        self.thread.sync()
        self.thread.save(force_update=True)
        self.forum.sync()
        self.forum.save(force_update=True)

    def message(self):
        messages.success(self.request, _('Thread "%(thread)s" has been deleted.') % {'thread': self.thread.name}, 'threads')

    def response(self):
        if self.request.acl.threads.can_see_deleted_threads(self.thread.forum):
            return redirect(reverse(self.type_prefix, kwargs={'thread': self.thread.pk, 'slug': self.thread.slug}))
        return self.threads_list_redirect()


class ShowThreadBaseView(DeleteHideBaseView):
    def set_context(self):
        acl = self.request.acl.threads.get_role(self.thread.forum_id)
        if not acl['can_delete_threads']:
            raise ACLError403(_("You cannot undelete this thread."))
        if not self.thread.start_post.deleted:
            raise ACLError403(_('This thread is already visible!'))

    def delete(self):
        self.thread.start_post.deleted = False
        self.thread.start_post.save(force_update=True)
        self.thread.set_checkpoint(self.request, 'undeleted')
        self.thread.sync()
        self.thread.save(force_update=True)
        self.forum.sync()
        self.forum.save(force_update=True)

    def message(self):
        messages.success(self.request, _('Thread "%(thread)s" has been restored.') % {'thread': self.thread.name}, 'threads')

    def response(self):
        if self.request.acl.threads.can_see_deleted_threads(self.thread.forum):
            return redirect(reverse(self.type_prefix, kwargs={'thread': self.thread.pk, 'slug': self.thread.slug}))
        return self.threads_list_redirect()


class DeleteReplyBaseView(DeleteHideBaseView):
    def set_context(self):
        self.request.acl.threads.allow_delete_post(self.request.user, self.forum,
                                                   self.thread, self.post, True)

    def delete(self):
        self.post.delete()
        self.thread.sync()
        self.thread.save(force_update=True)
        self.forum.sync()
        self.forum.save(force_update=True)

    def message(self):
        messages.success(self.request, _("Selected reply has been deleted."), 'threads')

    def response(self):
        return redirect(reverse(self.type_prefix, kwargs={'thread': self.thread.pk, 'slug': self.thread.slug}))


class HideReplyBaseView(DeleteHideBaseView):
    def set_context(self):
        self.request.acl.threads.allow_delete_post(self.request.user, self.forum,
                                                   self.thread, self.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 delete(self):
        self.post.delete_date = timezone.now()
        self.post.deleted = True
        self.post.save(force_update=True)
        self.thread.sync()
        self.thread.save(force_update=True)
        self.forum.sync()
        self.forum.save(force_update=True)

    def message(self):
        messages.success(self.request, _("Selected reply has been deleted."), 'threads_%s' % self.post.pk)

    def response(self):
        return self.redirect_to_post(self.post)


class ShowReplyBaseView(DeleteHideBaseView):
    def set_context(self):
        acl = self.request.acl.threads.get_role(self.thread.forum_id)
        if not acl['can_delete_posts']:
            raise ACLError403(_("You cannot undelete this reply."))
        if not self.post.deleted:
            raise ACLError403(_('This reply is already visible!'))

    def delete(self):
        self.post.deleted = False
        self.post.save(force_update=True)
        self.thread.sync()
        self.thread.save(force_update=True)
        self.forum.sync()
        self.forum.save(force_update=True)

    def message(self):
        messages.success(self.request, _("Selected reply has been restored."), 'threads_%s' % self.post.pk)

    def response(self):
        return self.redirect_to_post(self.post)


class DeleteCheckpointBaseView(DeleteHideBaseView):
    def set_context(self):
        self.request.acl.threads.allow_checkpoint_delete(self.forum)

    def delete(self):
        self.checkpoint.delete()

    def message(self):
        messages.success(self.request, _("Selected checkpoint has been deleted."), 'threads')

    def response(self):
        if 'retreat' in self.request.POST:
            return redirect(self.request.POST.get('retreat'))
        return redirect(reverse(self.type_prefix, kwargs={'thread': self.thread.pk, 'slug': self.thread.slug}))


class HideCheckpointBaseView(DeleteCheckpointBaseView):
    def set_context(self):
        self.request.acl.threads.allow_checkpoint_hide(self.forum)
        if self.checkpoint.deleted:
            raise ACLError403(_('This checkpoint is already hidden!'))

    def delete(self):
        self.checkpoint.deleted = True
        self.checkpoint.save(force_update=True)

    def message(self):
        messages.success(self.request, _("Selected checkpoint has been hidden."), 'threads')


class ShowCheckpointBaseView(DeleteCheckpointBaseView):
    def set_context(self):
        self.request.acl.threads.allow_checkpoint_show(self.forum)
        if not self.checkpoint.deleted:
            raise ACLError403(_('This checkpoint is already visible!'))

    def delete(self):
        self.checkpoint.deleted = False
        self.checkpoint.save(force_update=True)

    def message(self):
        messages.success(self.request, _("Selected checkpoint has been restored."), 'threads')