/**
 * 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' }
  };

  // Same wire-code -> Korean map as app.js (the two pages share no module system);
  // an unknown code falls through as the raw code — never blank.
  var TYPE_LABELS = {
    fall: '넘어짐', no_motion: '넘어짐 후 미동 없음', immobility: '장시간 부동',
    ghost: '위험 상태 소실', zone_warning: '경고구역 진입', zone_restricted: '제한구역 침입',
    pinch: '협착구역 침입', monitoring_degraded: '감시 성능 저하', device_fault: '장치 이상',
    lone_worker: '위험구역 단독 작업', overcapacity: '정원 초과', overstay: '체류 상한 초과',
    near_fall: '넘어질 뻔함 (니어미스)', ergo_report: '작업자세 부담 리포트'
  };

  // Metric keys -> Korean, so the detail view can print what the edge measured (the ergo
  // report's whole value IS its metrics). Unknown keys fall through as the raw key.
  var METRIC_LABELS = {
    observed_s: '관측 시간', trunk_high_s: '허리 고위험(60°+) 노출',
    trunk_mod_s: '허리 중위험(20~60°) 노출', arm_high_s: '팔 거상(90°+) 노출',
    squat_s: '웅크림 노출', prone_s: '엎드림 지속', immobility_s: '부동 지속',
    waited_s: '재출현 대기', dwell_s: '체류 시간', limit_s: '체류 상한',
    alone_s: '단독 작업 지속', workers: '감지 인원', required: '최소 인원', limit: '정원',
    torso_angle: '몸통 각도(°)', aspect_ratio: '박스 종횡비', height_remaining: '잔여 높이 비율',
    last_state: '소실 시 상태'
  };

  function metricValue(key, v) {
    if (/_s$/.test(key) && typeof v === 'number') {
      if (v >= 90) return Math.round(v / 60) + '분 ' + Math.round(v % 60) + '초';
      return v + '초';
    }
    return String(v);
  }

  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(TYPE_LABELS[ev.event_type] || 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 (ev.false_positive_by) addRow('오탐', textNode(ev.false_positive_by + ' 태그'));

    // 측정 지표: 엣지가 이벤트에 실은 수치 전부. ergo_report는 이 블록이 본문이다.
    var metrics = ev.metrics || {};
    Object.keys(metrics).forEach(function (key) {
      addRow(METRIC_LABELS[key] || key, textNode(metricValue(key, metrics[key])));
    });

    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;
    }
    // The edge sends an evidence TIMELINE (oldest → the event moment), so caption by
    // position from the end — exact offsets are edge config the server doesn't know.
    var CAPTIONS = ['이전', '직전', '발생 시점'];
    var kept = snaps.filter(function (s) { return s && s.file_uuid; });
    kept.forEach(function (s, i) {
      var fig = document.createElement('figure');
      fig.className = 'detail-snap';
      var img = document.createElement('img');
      img.src = B + '/snap/' + encodeURIComponent(s.file_uuid);
      var cap = kept.length > 1
        ? CAPTIONS[Math.max(0, CAPTIONS.length - kept.length + i)] : '발생 시점';
      img.alt = '사고 스냅샷 — ' + cap;
      img.className = 'detail-snapshot';
      img.loading = 'lazy';
      fig.appendChild(img);
      var fc = document.createElement('figcaption');
      fc.textContent = cap;
      fig.appendChild(fc);
      snapBox.appendChild(fig);
    });
  }

  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');
    });
})();