<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you 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.
-->

{{> www/common-header.tmpl }}
{{> www/query_detail_tabs.tmpl }}
<br/>
{{?backend_instances}}
<div>
  <label>
    <input type="checkbox" checked="true" id="toggle" onClick="toggleRefresh()"/>
    <span id="refresh_on">Auto-refresh on</span>
  </label>  Last updated: <span id="last-updated"></span>
</div>

<br/>
<table id="finstances" class='table table-hover table-bordered'>
  <thead>
    <tr>
      <th>Host</th>
      <th>Fragment<br/>Name</th>
      <th>Instance ID</th>
      <th>Current state</th>
      <th>Done</th>
      <th>Time since last report (ms)</th>
    </tr>
  </thead>
  <tbody>

  </tbody>
</table>

<script>
document.getElementById("finstances-tab").className = "active";

var intervalId = 0;
var table = null;
var refresh = function () {
    table.ajax.reload();
    document.getElementById("last-updated").textContent = new Date();
};

// Unpack Json backend_states by merging the backend host name into every instance stats
// row. Also clears the last report timestamp field for instances that have not started or
// have already finished execution.
function unpackJson(json) {
    var result = new Array();
    if (typeof json.backend_instances === "undefined") {
        // Table will be empty, remove it.
        table.table().destroy(true);
        $("#finstances").remove();
        // Display completion message.
        $("#query_finished_alert").css("visibility", "visible");
        // Stop auto refresh
        $("#toggle").prop("checked", false);
        toggleRefresh();
        return json;
    }
    for (var i = 0; i < json.backend_instances.length; ++i) {
        var backend_state = json.backend_instances[i];
        var instance_stats = backend_state.instance_stats;
        for (var j = 0; j < instance_stats.length; ++j) {
            var instance = instance_stats[j];
            instance.host = backend_state.host;
            if (instance.done) instance.time_since_last_heard_from = "";
            if (!instance.first_status_update_received) {
              instance.time_since_last_heard_from = "";
            }
            delete instance.first_status_update_received;
            result.push(instance);
        }
    }
    return result;
}

$(document).ready(function() {
    table = $('#finstances').DataTable({
        ajax: { url: "/query_finstances?query_id={{query_id}}&json",
                dataSrc: unpackJson,
              },
        "columns": [ {data: 'host'},
                     {data: 'fragment_name'},
                     {data: 'instance_id'},
                     {data: 'current_state'},
                     {data: 'done'},
                     {data: 'time_since_last_heard_from'}],
        "order": [[ 0, "desc" ]],
        "pageLength": 100
    });
    intervalId = setInterval(refresh, 1000);
});

function toggleRefresh() {
    if (document.getElementById("toggle").checked == true) {
        intervalId = setInterval(refresh, 1000);
        document.getElementById("refresh_on").textContent = "Auto-refresh on";
    } else {
        clearInterval(intervalId);
        document.getElementById("refresh_on").textContent = "Auto-refresh off";
    }
}

</script>
{{/backend_instances}}

<div class="alert alert-info" role="alert" id="query_finished_alert"
     style="visibility:hidden">
Query <strong>{{query_id}}</strong> has completed, or has not started any backends, yet.
</div>
{{^backend_instances}}
<script>$("#query_finished_alert").css("visibility", "visible");</script>
{{/backend_instances}}

{{> www/common-footer.tmpl }}