from admin.decorators import superuser_only
from computes.models import Compute
from django.contrib import messages
from django.http import HttpResponseRedirect
from django.shortcuts import get_object_or_404, render
from django.utils.translation import gettext_noop as _
from libvirt import libvirtError
from logs.audit import audit, failed
from vrtManager import util
from vrtManager.instance import wvmInstance, wvmInstances
from vrtManager.nwfilters import wvmNWFilter, wvmNWFilters


@superuser_only
def nwfilters(request, compute_id):
    """
    :param request:
    :param compute_id:
    :return:
    """

    nwfilters_all = []
    compute = get_object_or_404(Compute, pk=compute_id)

    try:
        conn = wvmNWFilters(
            compute.hostname,
            compute.login,
            compute.password,
            compute.type
        )

        for nwf in conn.get_nwfilters():
            nwfilters_all.append(conn.get_nwfilter_info(nwf))

        if request.method == "POST":
            if "create_nwfilter" in request.POST:
                xml = request.POST.get("nwfilter_xml", "")
                if xml:
                    name = uuid = None
                    try:
                        util.etree.fromstring(xml)
                        name = util.get_xml_path(xml, "/filter/@name")
                        uuid = util.get_xml_path(xml, "/filter/uuid")
                    except util.etree.ParseError:
                        pass
                    subject = f"Network filter {name or '(no name)'}"

                    for nwf in nwfilters_all:
                        if name == nwf["name"]:
                            failed(request, compute, subject, "add", "name already in use")
                            messages.error(request, _("A network filter with this name already exists"))
                            break
                        if uuid == nwf["uuid"]:
                            failed(request, compute, subject, "add", "UUID already in use")
                            messages.error(request, _("A network filter with this UUID already exists"))
                            break
                    else:
                        try:
                            with audit(request, compute, subject, "add"):
                                conn.create_nwfilter(xml)
                        except libvirtError as lib_err:
                            messages.error(request, lib_err)

            if "del_nwfilter" in request.POST:
                name = request.POST.get("nwfiltername", "")
                in_use = False
                nwfilter = conn.get_nwfilter(name)
                nwfilter_info = conn.get_nwfilter_info(name)

                is_conn = wvmInstances(
                    compute.hostname,
                    compute.login,
                    compute.password,
                    compute.type
                )
                instances = is_conn.get_instances()
                for inst in instances:
                    i_conn = wvmInstance(
                        compute.hostname,
                        compute.login,
                        compute.password,
                        compute.type,
                        inst,
                    )
                    dom_filterrefs = i_conn.get_filterrefs()

                    if name in dom_filterrefs:
                        in_use = True
                        msg = _(
                            "NWFilter is in use by %(instance)s. Cannot be deleted."
                        ) % {"instance": inst}
                        messages.error(request, msg)
                        failed(request, compute, f"Network filter {name}", "delete", f"in use by {inst}")
                        i_conn.close()
                        break

                is_conn.close()
                if nwfilter and not in_use:
                    with audit(request, compute, f"Network filter {name}", "delete"):
                        nwfilter.undefine()
                    nwfilters_all.remove(nwfilter_info)

            if "cln_nwfilter" in request.POST:
                name = request.POST.get("nwfiltername", "")
                cln_name = request.POST.get("cln_name", name + "-clone")

                with audit(request, compute, f"Network filter {name}", f"clone as {cln_name}"):
                    conn.clone_nwfilter(name, cln_name)
                nwfilters_all.append(conn.get_nwfilter_info(cln_name))

        conn.close()
    except libvirtError as lib_err:
        messages.error(request, lib_err)
    except Exception as err:
        messages.error(request, err)

    return render(
        request,
        "nwfilters.html",
        {
            "nwfilters": nwfilters_all,
            "compute": compute,
        },
    )


@superuser_only
def nwfilter(request, compute_id, nwfltr):
    """
    :param request:
    :param compute_id:
    :param nwfltr:
    :return:
    """
    nwfilters_all = []
    compute = get_object_or_404(Compute, pk=compute_id)

    try:
        nwfilter = wvmNWFilter(
            compute.hostname,
            compute.login,
            compute.password,
            compute.type,
            nwfltr
        )
        conn = wvmNWFilters(
            compute.hostname,
            compute.login,
            compute.password,
            compute.type
        )

        for nwf in conn.get_nwfilters():
            nwfilters_all.append(conn.get_nwfilter_info(nwf))

        uuid = nwfilter.get_uuid()
        name = nwfilter.get_name()
        xml = nwfilter.get_xml()
        rules = nwfilter.get_rules()
        refs = nwfilter.get_filter_refs()

        if request.method == "POST":

            subject = f"Network filter {name}"
            if "edit_nwfilter" in request.POST:
                new_xml = request.POST.get("edit_xml", "")

                if new_xml:
                    with audit(request, compute, subject, "change XML"):
                        conn.create_nwfilter(new_xml)

            if "del_nwfilter_rule" in request.POST:
                action = request.POST.get("action", "")
                direction = request.POST.get("direction", "")
                priority = request.POST.get("priority", "")

                with audit(request, compute, subject, "delete rule"):
                    conn.create_nwfilter(nwfilter.delete_rule(action, direction, priority))

            if "del_nwfilter_ref" in request.POST:
                ref_name = request.POST.get("ref")
                with audit(request, compute, subject, f"delete reference {ref_name}"):
                    conn.create_nwfilter(nwfilter.delete_ref(ref_name))

            if "add_nwfilter_rule" in request.POST:
                rule_xml = request.POST.get("nwfilterrule_xml", "")
                if not rule_xml:
                    return HttpResponseRedirect(request.get_full_path())
                with audit(request, compute, subject, "add rule"):
                    conn.create_nwfilter(nwfilter.add_rule(rule_xml))

            if "add_nwfilter_ref" in request.POST:
                ref_name = request.POST.get("nwfilters_select", "")
                if not ref_name:
                    return HttpResponseRedirect(request.get_full_path())
                with audit(request, compute, subject, f"add reference {ref_name}"):
                    conn.create_nwfilter(nwfilter.add_ref(ref_name))

            return HttpResponseRedirect(request.get_full_path())
        conn.close()
        nwfilter.close()
    except libvirtError as lib_err:
        messages.error(request, lib_err)
    except Exception as error_msg:
        messages.error(request, error_msg)

    return render(request, "nwfilter.html", locals())