from django.http import HttpResponseRedirect
from django.core.urlresolvers import reverse
from django.shortcuts import render
from computes.models import Compute
from vrtManager.hostdetails import wvmHostDetails
from vrtManager.connection import connection_manager
from libvirt import libvirtError


def computes(request):
    """
    :param request:
    :return:
    """

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

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

    def get_hosts_status(computes):
        """
        Function return all hosts all vds on host
        """
        compute_data = []
        for compute in computes:
            compute_data.append({'id': compute.id,
                                 'name': compute.name,
                                 'hostname': compute.hostname,
                                 'status': connection_manager.host_is_up(compute.type, compute.hostname),
                                 'type': compute.type,
                                 'login': compute.login,
                                 'password': compute.password
                                })
        return compute_data

    computes = Compute.objects.filter()
    computes_info = get_hosts_status(computes)

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

def overview(request, compute_id):
    """
    :param request:
    :return:
    """

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

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

    error_messages = []
    compute = Compute.objects.get(id=compute_id)

    try:
        conn = wvmHostDetails(compute.hostname,
                              compute.login,
                              compute.password,
                              compute.type)
        hostname, host_arch, host_memory, logical_cpu, model_cpu, uri_conn = conn.get_node_info()
        hypervisor = conn.hypervisor_type()
        mem_usage = conn.get_memory_usage()
        conn.close()
    except libvirtError as lib_err:
        error_messages.append(lib_err)

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