{# host_agent history-graph widget — the host-view utilization chart, embedded
   on a dashboard. Fills the (resizable) panel; epoch-ms linear axis so no
   Chart.js date adapter is needed. #}
{% set has_data = host and (series.cpu_pct or series.mem_used_pct or series.disk_root) %}
{% if not host %}
<div style="color:var(--text-muted);font-size:0.85rem;padding:0.75rem 0;">
  No host selected. <strong>Edit</strong> this dashboard and pick a host for this graph.
</div>
{% elif not has_data %}
<div style="color:var(--text-muted);font-size:0.85rem;padding:0.75rem 0;">
  No agent metrics for <strong>{{ host.name }}</strong> in the last {{ hours }}h yet.
</div>
{% else %}
<div style="height:100%;min-height:180px;position:relative;">
  <canvas id="host-hist-{{ wid }}"></canvas>
</div>
<script>
(function () {
  var el = document.getElementById("host-hist-{{ wid }}");
  if (!el) return;
  var series = {{ series|tojson }};
  var fmtTime = function (v) {
    var d = new Date(v);
    return ("0" + d.getHours()).slice(-2) + ":" + ("0" + d.getMinutes()).slice(-2);
  };
  var ds = [
    { key: "cpu_pct",      label: "CPU %",    color: "#c8a840" },
    { key: "mem_used_pct", label: "Mem %",    color: "#4aa86a" },
    { key: "disk_root",    label: "Disk / %", color: "#c87840" },
  ];
  new Chart(el.getContext("2d"), {
    type: "line",
    data: { datasets: ds.map(function (d) {
      return {
        label: d.label,
        data: (series[d.key] || []).map(function (p) { return { x: p[0], y: p[1] }; }),
        borderColor: d.color, backgroundColor: d.color, borderWidth: 1.5, tension: 0.25,
      };
    }) },
    options: {
      responsive: true, maintainAspectRatio: false,
      interaction: { mode: "index", intersect: false },
      elements: { point: { radius: 0 } },
      scales: {
        x: { type: "linear", ticks: { callback: function (v) { return fmtTime(v); }, maxTicksLimit: 6, color: "#8a8a92", font: { size: 10 } }, grid: { color: "#30303a" } },
        // Auto-scale to the data (with a little headroom) so the lines fill the
        // panel instead of hugging the bottom of a fixed 0–100 axis. Axis labels
        // still show the real %, so the values stay honest.
        y: { beginAtZero: true, grace: "8%", ticks: { color: "#8a8a92", font: { size: 10 } }, grid: { color: "#30303a" } },
      },
      plugins: {
        legend: { labels: { color: "#b8b8b0", boxWidth: 10, font: { size: 11 } } },
        tooltip: { callbacks: { title: function (items) { return items.length ? fmtTime(items[0].parsed.x) : ""; } } },
      },
    },
  });
})();
</script>
{% endif %}