{% extends "base.html" %}
{% block title %}Monitoring · API Gateway{% endblock %}
{% block content %}
<h1>Usage Monitoring</h1>

<div class="row" style="margin-bottom:16px">
  <div class="range-picker" role="group" aria-label="Time range" style="margin:0">
    <button class="ghost" data-hours="1">1 h</button>
    <button class="ghost" data-hours="6">6 h</button>
    <button class="ghost" data-hours="24">24 h</button>
    <button class="ghost" data-hours="72">3 days</button>
    <button class="ghost" data-hours="168">7 days</button>
    <button class="ghost" data-hours="720">30 days</button>
  </div>
  <select id="f-service" class="right" style="max-width:170px">
    <option value="">All services</option>
    {% for s in services %}<option value="{{ s.id }}">{{ s.name }}</option>{% endfor %}
  </select>
  <select id="f-user" style="max-width:150px">
    <option value="">All users</option>
    {% for u in users %}<option value="{{ u.id }}">{{ u.username }}</option>{% endfor %}
  </select>
  <select id="f-key" style="max-width:150px">
    <option value="">All keys</option>
    {% for k in keys %}<option value="{{ k.id }}">{{ k.name }}</option>{% endfor %}
  </select>
</div>

<div class="tiles">
  <div class="tile"><div class="label">Requests</div><div class="value" id="t-total">–</div></div>
  <div class="tile"><div class="label">Errors (5xx)</div><div class="value" id="t-errors">–</div></div>
  <div class="tile"><div class="label">Error rate</div><div class="value" id="t-rate">–</div></div>
  <div class="tile"><div class="label">Avg latency</div><div class="value" id="t-latency">–</div></div>
</div>

<div class="grid cols-2">
  <div class="card">
    <h2>Requests over time</h2>
    <div class="chart-box"><canvas id="chart-traffic"></canvas></div>
  </div>
  <div class="card">
    <h2>Average latency over time (ms)</h2>
    <div class="chart-box"><canvas id="chart-latency-ts"></canvas></div>
  </div>
  <div class="card">
    <h2>Requests by service</h2>
    <div class="chart-box"><canvas id="chart-services"></canvas></div>
  </div>
  <div class="card">
    <h2>Responses by status code</h2>
    <div class="chart-box"><canvas id="chart-status"></canvas></div>
  </div>
  <div class="card">
    <h2>Requests by user</h2>
    <div class="chart-box"><canvas id="chart-users"></canvas></div>
  </div>
  <div class="card">
    <h2>Requests by endpoint</h2>
    <div class="chart-box"><canvas id="chart-endpoints"></canvas></div>
  </div>
  <div class="card">
    <h2>Average latency by service (ms)</h2>
    <div class="chart-box"><canvas id="chart-latency"></canvas></div>
  </div>
  <div class="card">
    <h2>Top API keys by usage</h2>
    <div class="chart-box"><canvas id="chart-keys"></canvas></div>
  </div>
</div>

<div class="card">
  <h2>Latest 100 requests</h2>
  <table>
    <thead><tr><th>Time (UTC)</th><th>Service</th><th>Key</th><th>User</th><th>Endpoint</th><th>Request</th><th>Status</th><th>Latency</th><th>Client IP</th></tr></thead>
    <tbody>
      {% for log in logs %}
      <tr>
        <td>{{ log.timestamp.strftime("%Y-%m-%d %H:%M:%S") }}</td>
        <td class="strong">{{ log.service.name if log.service else "–" }}</td>
        <td>{{ log.api_key.name if log.api_key else "–" }}</td>
        <td>{{ log.api_key.user.username if log.api_key else "–" }}</td>
        <td>{% if log.endpoint %}<code>{{ log.endpoint.path }}</code>{% else %}–{% endif %}</td>
        <td><a href="/admin/requests?inspect={{ log.id }}">{{ log.method }} {{ log.path[:50] }}</a></td>
        <td class="status-{{ log.status_code // 100 }}xx">{{ log.status_code }}</td>
        <td>{{ "%.1f" | format(log.latency_ms) }} ms</td>
        <td>{{ log.client_ip }}</td>
      </tr>
      {% else %}
      <tr><td colspan="9">No requests logged yet.</td></tr>
      {% endfor %}
    </tbody>
  </table>
</div>
{% endblock %}

{% block scripts %}
<script>
const charts = {};
let hours = 24;

function qs() {
  const p = new URLSearchParams({ hours });
  for (const [param, id] of [['service_id', 'f-service'], ['user_id', 'f-user'], ['key_id', 'f-key']]) {
    const v = document.getElementById(id).value;
    if (v) p.set(param, v);
  }
  return p.toString();
}

function barChart(id, labels, data, horizontal = false) {
  if (charts[id]) charts[id].destroy();
  charts[id] = new Chart(document.getElementById(id), {
    type: 'bar',
    data: { labels, datasets: [{ data, backgroundColor: GW.blue, borderRadius: 4, maxBarThickness: 26 }] },
    options: {
      maintainAspectRatio: false,
      indexAxis: horizontal ? 'y' : 'x',
      plugins: { legend: { display: false } },
      scales: horizontal
        ? { x: { beginAtZero: true }, y: { grid: { display: false } } }
        : { x: { grid: { display: false } }, y: { beginAtZero: true, ticks: { precision: 0 } } },
    },
  });
}

function lineChart(id, labels, datasets, showLegend) {
  if (charts[id]) charts[id].destroy();
  charts[id] = new Chart(document.getElementById(id), {
    type: 'line',
    data: { labels, datasets },
    options: {
      maintainAspectRatio: false,
      interaction: { mode: 'index', intersect: false },
      plugins: { legend: { display: showLegend } },
      scales: {
        x: { grid: { display: false }, ticks: { maxTicksLimit: 14 } },
        y: { beginAtZero: true },
      },
    },
  });
}

const lineStyle = { borderWidth: 2, pointRadius: 0, pointHoverRadius: 4, tension: 0.3, spanGaps: true };

async function load() {
  const query = qs();
  const [sum, ts, lts, bs, st, lat, keys, byUser, byEndpoint] = await Promise.all([
    'summary', 'timeseries', 'latency-timeseries', 'by-service', 'by-status',
    'latency-by-service', 'top-keys', 'by-user', 'by-endpoint',
  ].map(ep => GW.fetchJSON(`/admin/api/stats/${ep}?${query}`)));

  document.getElementById('t-total').textContent = sum.total_requests.toLocaleString();
  document.getElementById('t-errors').textContent = sum.error_count.toLocaleString();
  document.getElementById('t-rate').textContent = sum.error_rate + '%';
  document.getElementById('t-latency').innerHTML = sum.avg_latency_ms + '<small> ms</small>';

  lineChart('chart-traffic', ts.labels, [
    { label: 'Succeeded', data: ts.ok, borderColor: GW.blue, backgroundColor: GW.blue, ...lineStyle },
    { label: 'Errors (5xx)', data: ts.errors, borderColor: GW.red, backgroundColor: GW.red, ...lineStyle },
  ], true);

  lineChart('chart-latency-ts', lts.labels, [
    { label: 'Avg latency (ms)', data: lts.avg_ms, borderColor: GW.blue, backgroundColor: GW.blue, ...lineStyle },
  ], false);

  barChart('chart-services', bs.labels, bs.counts, true);
  barChart('chart-status', st.labels, st.counts);
  barChart('chart-users', byUser.labels, byUser.counts, true);
  barChart('chart-endpoints', byEndpoint.labels, byEndpoint.counts, true);
  barChart('chart-latency', lat.labels, lat.avg_ms, true);
  barChart('chart-keys', keys.labels, keys.counts, true);
}

document.querySelectorAll('.range-picker button').forEach(b =>
  b.addEventListener('click', () => {
    hours = +b.dataset.hours;
    document.querySelectorAll('.range-picker button').forEach(x =>
      x.classList.toggle('active', x === b));
    load();
  }));
['f-service', 'f-user', 'f-key'].forEach(id =>
  document.getElementById(id).addEventListener('change', load));

document.querySelector('.range-picker button[data-hours="24"]').classList.add('active');
load();
</script>
{% endblock %}