from django.contrib import messages
from django.contrib.messages.views import SuccessMessageMixin
from django.db.models import Max
from django.http import Http404
from django.urls import reverse
from django.utils.translation import gettext_lazy as _
from django.views.generic import ListView, DetailView, FormView, UpdateView

from c3nav.control.forms import MeshMessageFilterForm
from c3nav.control.views.base import ControlPanelMixin
from c3nav.mesh.forms import MeshMessageForm, MeshNodeForm
from c3nav.mesh.messages import MeshMessageType
from c3nav.mesh.models import MeshNode, NodeMessage


class MeshNodeListView(ControlPanelMixin, ListView):
    model = MeshNode
    template_name = "control/mesh_nodes.html"
    ordering = "address"
    context_object_name = "nodes"

    def get_queryset(self):
        return super().get_queryset().annotate(last_msg=Max('received_messages__datetime')).prefetch_last_messages()


class MeshNodeDetailView(ControlPanelMixin, DetailView):
    model = MeshNode
    template_name = "control/mesh_node_detail.html"
    pk_url_kwargs = "address"
    context_object_name = "node"

    def get_queryset(self):
        return super().get_queryset().annotate(last_msg=Max('received_messages__datetime')).prefetch_last_messages()


class MeshNodeEditView(ControlPanelMixin, SuccessMessageMixin, UpdateView):
    model = MeshNode
    form_class = MeshNodeForm
    template_name = "control/form.html"
    success_message = _('Name updated successfully')

    def get_context_data(self, **kwargs):
        return {
            **super().get_context_data(),
            'title': _('Editing mesh node: %s') % self.get_object(),
        }

    def get_success_url(self):
        return reverse('control.mesh_node.detail', kwargs={'pk': self.get_object().pk})


class MeshMessageListView(ControlPanelMixin, ListView):
    model = NodeMessage
    template_name = "control/mesh_messages.html"
    ordering = "-datetime"
    paginate_by = 20
    context_object_name = "mesh_messages"

    def get_queryset(self):
        qs = super().get_queryset()

        self.form = MeshMessageFilterForm(self.request.GET)
        if self.form.is_valid():
            if self.form.cleaned_data['message_types']:
                qs = qs.filter(message_type__in=self.form.cleaned_data['message_types'])
            if self.form.cleaned_data['src_nodes']:
                qs = qs.filter(src_node__in=self.form.cleaned_data['src_nodes'])

        return qs

    def get_context_data(self, *args, **kwargs):
        ctx = super().get_context_data(*args, **kwargs)

        form_data = self.request.GET.copy()
        form_data.pop('page', None)

        ctx.update({
            'form': self.form,
            'form_data': form_data.urlencode(),
        })
        return ctx


class MeshMessageSendView(ControlPanelMixin, FormView):
    template_name = "control/mesh_message_send.html"

    def get_form_class(self):
        try:
            return MeshMessageForm.get_form_for_type(MeshMessageType[self.kwargs['msg_type']])
        except KeyError:
            raise Http404('unknown message type')

    def get_form_kwargs(self):
        return {
            **super().get_form_kwargs(),
            'recipient': self.kwargs.get('recipient', None),
        }

    def get_initial(self):
        if 'recipient' in self.kwargs and self.kwargs['msg_type'].startswith('CONFIG_'):
            try:
                node = MeshNode.objects.get(address=self.kwargs['recipient'])
            except MeshNode.DoesNotExist:
                pass
            else:
                return node.last_messages[self.kwargs['msg_type']].parsed.tojson()
        return {}

    def get_success_url(self):
        if 'recipient' in self.kwargs and False:
            return reverse('control.mesh_node.detail', kwargs={'pk': self.kwargs['recipient']})
        else:
            return self.request.path

    def form_valid(self, form):
        form.send()
        messages.success(self.request, _('Message sent successfully'))
        return super().form_valid(form)