/**
 * Incident detail view: parses the event id from /events/{id}/view, fetches
 * GET /events/{id} (JSON {event, snapshots}), and renders the event metadata
 * plus each snapshot as an <img src="/snap/{file_uuid}">.
 *
 * XSS-safe: every dynamic value is written via textContent or a validated URL
 * attribute, never innerHTML. Severity is shown as icon + text (never color
 * alone, per NF9). On 401 the browser is redirected to /login, mirroring app.js.
 */
(function () {
  'use strict';

  // Mount prefix: '' at the web root, '/move_detect' when the app shares a www/ with another
  // site. Injected by src/View/layout.php from the server's SCRIPT_NAME.
  var B = window.APP_BASE || '';

  var SEVERITY_LABELS = {
    critical: { icon: '⛔', text: '위급', cls: 'sev-critical' },
    high:     { icon: '⚠', text: '높음', cls: 'sev-high' },
    warning:  { icon: '△', text: '경고', cls: 'sev-warning' },
    info:     { icon: 'ℹ', text: '정보', cls: 'sev-info' }
  };

  var meta = document.getElementById('event-detail-meta');
  var snapBox = document.getElementById('event-detail-snapshots');
  if (!meta) return;

  var m = location.pathname.match(/\/events\/(\d+)\/view/);
  if (!m) {
    meta.textContent = '잘못된 주소입니다.';
    meta.removeAttribute('aria-busy');
    return;
  }
  var id = m[1];

  function severityInfo(sev) {
    return SEVERITY_LABELS[sev] || { icon: 'ℹ', text: sev || '알수없음', cls: 'sev-info' };
  }

  function formatTime(occurredAt) {
    if (!occurredAt && occurredAt !== 0) return '-';
    var d = new Date(Number(occurredAt) * 1000);
    if (isNaN(d.getTime())) return '-';
    return d.toLocaleString('ko-KR');
  }

  function buildBadge(sev) {
    var info = severityInfo(sev);
    var badge = document.createElement('span');
    badge.className = 'severity-badge ' + info.cls;
    var icon = document.createElement('span');
    icon.className = 'icon';
    icon.setAttribute('aria-hidden', 'true');
    icon.textContent = info.icon;
    var label = document.createElement('span');
    label.className = 'label';
    label.textContent = info.text;
    badge.appendChild(icon);
    badge.appendChild(label);
    return badge;
  }

  function textNode(value) {
    var span = document.createElement('span');
    span.textContent = (value === null || value === undefined || value === '') ? '-' : String(value);
    return span;
  }

  function addRow(label, valueNode) {
    var row = document.createElement('div');
    row.className = 'detail-row';
    var k = document.createElement('span');
    k.className = 'detail-label';
    k.textContent = label + ': ';
    row.appendChild(k);
    row.appendChild(valueNode);
    meta.appendChild(row);
  }

  function render(data) {
    var ev = data.event || {};
    meta.textContent = '';
    meta.removeAttribute('aria-busy');

    addRow('심각도', buildBadge(ev.severity));
    addRow('유형', textNode(ev.event_type));
    addRow('카메라', textNode(ev.camera_id));
    addRow('발생 시각', textNode(formatTime(ev.occurred_at)));
    addRow('지속(초)', textNode(ev.duration_s));
    addRow('확인', textNode(ev.acknowledged_by || '미확인'));

    if (!snapBox) return;
    snapBox.textContent = '';
    var snaps = data.snapshots || [];
    if (snaps.length === 0) {
      var none = document.createElement('p');
      none.textContent = '스냅샷이 없습니다.';
      snapBox.appendChild(none);
      return;
    }
    snaps.forEach(function (s) {
      if (!s || !s.file_uuid) return;
      var img = document.createElement('img');
      img.src = B + '/snap/' + encodeURIComponent(s.file_uuid);
      img.alt = '사고 스냅샷';
      img.className = 'detail-snapshot';
      img.loading = 'lazy';
      snapBox.appendChild(img);
    });
  }

  fetch(B + '/events/' + encodeURIComponent(id), { headers: { Accept: 'application/json' } })
    .then(function (res) {
      if (res.status === 401) { window.location.href = B + '/login'; return null; }
      if (!res.ok) throw new Error('detail_failed:' + res.status);
      return res.json();
    })
    .then(function (data) { if (data) render(data); })
    .catch(function () {
      meta.textContent = '불러오기 실패';
      meta.removeAttribute('aria-busy');
    });
})();