from django.shortcuts import render
from django.http import HttpResponse, HttpResponseRedirect
from django.urls import reverse
from instances.models import Instance
from logs.models import Logs
from django.conf import settings
import json


def addlogmsg(user, instance, message):
    """
    :param user:
    :param instance:
    :param message:
    :return:
    """
    add_log_msg = Logs(user=user, instance=instance, message=message)
    add_log_msg.save()


def showlogs(request, page=1):
    """
    :param request:
    :param page:
    :return:
    """

    if not request.user.is_superuser:
        return HttpResponseRedirect(reverse('index'))

    page = int(page)
    limit_from = (page-1)*settings.LOGS_PER_PAGE
    limit_to = page*settings.LOGS_PER_PAGE
    logs = Logs.objects.all().order_by('-date')[limit_from:limit_to+1]
    has_next_page = logs.count() > settings.LOGS_PER_PAGE
    # TODO: remove last element from queryset, but do not affect database

    return render(request, 'showlogs.html', locals())


def vm_logs(request, vname):
    """
    :param request:
    :param vname:
    :return:
    """
    
    if not request.user.is_superuser:
        return HttpResponseRedirect(reverse('index'))

    vm = Instance.objects.get(name=vname)
    logs_ = Logs.objects.filter(instance=vm.name, date__gte=vm.created).order_by('-date')
    logs = []
    for l in logs_:
        log = dict()
        log['user'] = l.user
        log['instance'] = l.instance
        log['message'] = l.message
        log['date'] = l.date.strftime('%x %X')
        logs.append(log)
    
    return HttpResponse(json.dumps(logs))