{# 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="display:flex;flex-direction:column;height:100%;min-height:200px;">
  {# Name the host the graph represents (panel title is generic) + a live range
     toggle that re-requests this widget without entering edit mode. #}
  <div style="flex:0 0 auto;display:flex;align-items:center;gap:0.5rem;flex-wrap:wrap;font-size:0.75rem;color:var(--text-muted);margin-bottom:0.3rem;">
    {% if session.user_id %}
    <a href="/hosts/{{ host.id }}" style="font-weight:600;">{{ host.name }}</a>
    {% else %}
    <strong style="color:var(--text);">{{ host.name }}</strong>
    {% endif %}
    <span class="hist-range" style="margin-left:auto;display:inline-flex;border:1px solid var(--border-mid);border-radius:5px;overflow:hidden;">
      {% for opt in [1, 6, 24] %}
      <button type="button" onclick="histRange({{ wid }}, '{{ host.id }}', {{ opt }})"
        style="border:0;cursor:pointer;padding:0.1rem 0.45rem;font-size:0.72rem;
               background:{% if opt == hours %}var(--accent){% else %}transparent{% endif %};
               color:{% if opt == hours %}#fff{% else %}var(--text-muted){% endif %};">{{ opt }}h</button>
      {% endfor %}
    </span>
  </div>
  <div style="flex:1 1 auto;min-height:150px;position:relative;">
    <canvas id="host-hist-{{ wid }}"></canvas>
  </div>
</div>
<script>
// Live time-range switch. Rewrites the parent cell's hx-get so the choice sticks
// across polls (htmx re-reads the attribute each poll), then fetches immediately.
window.histRange = function (wid, hostId, hours) {
  var cell = document.getElementById("widget-" + wid);
  if (!cell) return;
  var base = (cell.getAttribute("hx-get") || "").split("?")[0];
  var url = base + "?host_id=" + encodeURIComponent(hostId) + "&hours=" + hours + "&wid=" + wid;
  cell.setAttribute("hx-get", url);
  if (window.htmx) window.htmx.ajax("GET", url, { target: cell, swap: "innerHTML" });
};
(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" } },
        // Fixed 0–{{ y_max }} ceiling (server snaps the data peak up to the next
        // 10% band). Steady across refreshes — auto-scaling made the zoom jump on
        // every poll — while a banded ceiling still keeps the lines filling the panel.
        y: { min: 0, max: {{ y_max }}, 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 %}