from __future__ import unicode_literals
from django.http import HttpResponseRedirect
from django.utils.translation import ugettext_lazy as _
from django.contrib import messages
try:
    from django.urls import reverse_lazy
except ImportError:
    from django.core.urlresolvers import reverse_lazy
from django.views.generic import View, TemplateView

from django.core.exceptions import PermissionDenied
from django.apps import apps
from . import uwsgi


class UwsgiStatus(TemplateView):
    '''
    uWSGI Status View
    '''
    if apps.is_installed('wagtail.admin'):
        template_name = 'uwsgi/wagtail_uwsgi.html'
    else:
        template_name = 'uwsgi/uwsgi.html'

    def get (self, request, *args, **kwargs):
        if not request.user.is_superuser:
            raise PermissionDenied
            
        return super(UwsgiStatus, self).get(request, *args, **kwargs)
        
    def get_context_data(self, **kwargs):
        context = super(UwsgiStatus, self).get_context_data(**kwargs)
        if uwsgi is None:
            context['unavailable'] = True
            return context
        else:
            from .stats import get_uwsgi_stats
            context.update(get_uwsgi_stats())
            return context


class UwsgiCacheClear(View):
    '''
    Clear uWSGI Cache View
    '''
    def get(self, request):
        if not request.user.is_superuser:
            raise PermissionDenied
        if uwsgi is not None and uwsgi.masterpid() > 0:
            uwsgi.cache_clear()
            messages.add_message(request, messages.SUCCESS, _(
                'uWSGI Cache cleared!'), fail_silently=True)
        else:
            messages.add_message(request, messages.ERROR, _(
                'The uWSGI master process is not active'), fail_silently=True)
        return HttpResponseRedirect(reverse_lazy('uwsgi_index'))


class UwsgiReload(View):
    '''
    Reload uWSGI View
    '''
    def get(self, request):
        if not request.user.is_superuser:
            raise PermissionDenied
        if uwsgi is not None and uwsgi.masterpid() > 0:
            uwsgi.reload()
            messages.add_message(
                request, messages.SUCCESS, _('uWSGI reloaded!'), fail_silently=True)
        else:
            messages.add_message(request, messages.ERROR, _(
                'The uWSGI master process is not active'), fail_silently=True)
        return HttpResponseRedirect(reverse_lazy('uwsgi_index'))


class UwsgiLog(View):
    '''
    uWSGI Log View
    '''
    def post(self, request):
        if not request.user.is_superuser:
            raise PermissionDenied
        if uwsgi is not None:
            uwsgi.log(request.POST.get('log_message'))
            messages.add_message(request, messages.SUCCESS, _(
                'uWSGI Log message has been sent!'), fail_silently=True)
        else:
            messages.add_message(request, messages.ERROR, _(
                'uWSGI is not available!'), fail_silently=True)
        return HttpResponseRedirect(reverse_lazy('uwsgi_index'))


class UwsgiSignal(View):
    '''
    uWSGI Signal View
    '''
    def post(self, request):
        if not request.user.is_superuser:
            raise PermissionDenied
        if uwsgi is not None:
            uwsgi.signal(int(request.POST.get('signal_number')))
            messages.add_message(request, messages.SUCCESS, _(
                'uWSGI signal has been sent!'), fail_silently=True)
        else:
            messages.add_message(request, messages.ERROR, _(
                'uWSGI is not available!'), fail_silently=True)
        return HttpResponseRedirect(reverse_lazy('uwsgi_index'))