<!--
~ Copyright 2018-present Open Networking Foundation
~
~ Licensed under the Apache License, Version 2.0 (the "License");
~ you may not use this file except in compliance with the License.
~ You may obtain a copy of the License at
~
~     http://www.apache.org/licenses/LICENSE-2.0
~
~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
~ See the License for the specific language governing permissions and
~ limitations under the License.
-->
<svg:defs xmlns:svg="http://www.w3.org/2000/svg">
    <!-- Template explanation: Define an SVG Filter that in
        line 1) render the target object in to a bit map and apply a blur to it
            based on its alpha channel
        line 2) take that blurred layer and shift it down and to the right by 4
        line 3) Merge this blurred and shifted layer and overlay it with the
            original target object
    -->
    <svg:filter id="drop-shadow-host" x="-25%" y="-25%" width="200%" height="200%">
        <svg:feGaussianBlur in="SourceAlpha" stdDeviation="4" result="blur" />
        <svg:feOffset in="blur" dx="4" dy="4" result="offsetBlur"/>
        <svg:feMerge >
            <svg:feMergeNode in="offsetBlur" />
            <svg:feMergeNode in="SourceGraphic" />
        </svg:feMerge>
    </svg:filter>
    <svg:radialGradient id="three_stops_radial">
        <svg:stop offset= "0%" style="stop-color: #e3e5d6;" />
        <svg:stop offset= "70%" style="stop-color: #c3c5b6;" />
        <svg:stop offset="100%" style="stop-color: #a3a596;" />
    </svg:radialGradient>
</svg:defs>
<!-- Template explanation: Creates an SVG Group and in
    line 1) transform it to the position calculated by the d3 force graph engine
    line 2) Give it various CSS styles depending on attributes
    line 3) When it is clicked, call the method that toggles the selection and
        emits an event.
    Other child objects have their own description
-->
<svg:g  xmlns:svg="http://www.w3.org/2000/svg"
        [attr.transform]="'translate(' + host?.x + ',' + host?.y + '), scale(' + scale + ')'"
        [ngClass]="['node', 'host', 'endstation', 'fixed', selected?'selected':'', 'hovered']"
        (click)="toggleSelected(host, $event)">
    <svg:desc>Host {{host.id}}</svg:desc>
    <!-- Template explanation: Creates an SVG Circle and in
        line 1) Apply the drop shadow defined above to this circle
        line 2) Apply the radial gradient defined above to the circle
    -->
    <svg:circle r="15"
        filter="url(#drop-shadow-host)"
        style="fill: url(#three_stops_radial)">
    </svg:circle>
    <svg:use xlink:href="#m_endstation" width="22.5" height="22.5" x="-11.25" y="-11.25">
    </svg:use>
    <!-- Template explanation: Creates an SVG Text
        line 1) if the labelToggle is not 0
        line 2) shift it below the circle, and have it centred with the circle
        line 3) apply a scale and call on the hostName(0 method to get the
            displayed value
    -->
    <svg:text
        *ngIf="labelToggle != 0"
        dy="30" text-anchor="middle"
        >{{hostName()}}</svg:text>
</svg:g>