{{define "content"}}
<div class="wrap">
  <div class="page-head">
    <div>
      <h1>迷雾遮罩区</h1>
      <div class="sub">这些范围内的迷雾<strong>对访客隐藏</strong>，你自己仍然看得到。在地图上点一下就是圆心，半径可调。</div>
    </div>
    <div class="row">
      <a class="btn" href="/admin">← 返回后台</a>
    </div>
  </div>

  <div class="card">
    {{if .Flash}}<div class="alert ok">{{.Flash}}</div>{{end}}
    {{if .Err}}<div class="alert err">{{.Err}}</div>{{end}}

    <div id="mask-map" style="height:380px;border-radius:10px;background:var(--line-soft)"></div>

    <form method="post" action="/admin/fog/mask/save" id="mask-form" style="margin-top:12px">
      <input type="hidden" name="id">
      <input type="hidden" name="lat">
      <input type="hidden" name="lon">
      <input type="hidden" name="crs">
      <div class="row">
        <label class="f" style="flex:1 1 200px;margin-bottom:0">
          <span>名称（可选）</span>
          <input type="text" name="name" maxlength="40" placeholder="例如：家附近、公司周边">
        </label>
        <label class="f" style="flex:0 1 150px;margin-bottom:0">
          <span>半径（米）</span>
          <input type="number" name="radius_m" min="50" max="50000" step="50" value="500" required>
        </label>
        <button class="btn primary" type="submit" id="mask-save">保存</button>
        <button class="btn" type="button" id="mask-reset">清除选择</button>
      </div>
      <div class="muted" id="mask-hint" style="font-size:12.5px;margin-top:6px">在下方地图上点选圆心</div>
    </form>
  </div>

  <div class="card">
    <h2>已有遮罩区（{{len .Masks}}）</h2>
    {{if .Masks}}
    <table class="tb">
      <thead><tr><th>名称</th><th>圆心（纬度, 经度）</th><th>半径</th><th></th></tr></thead>
      <tbody>
      {{range .Masks}}
        <tr>
          <td>{{if .Name}}{{.Name}}{{else}}<span class="muted">（未命名）</span>{{end}}</td>
          <td class="mono">{{printf "%.5f" .Lat}}, {{printf "%.5f" .Lon}}</td>
          <td>{{printf "%.0f" .RadiusM}} 米</td>
          <td>
            <button class="btn sm" type="button" data-edit
                    data-id="{{.ID}}" data-name="{{.Name}}"
                    data-lat="{{.Lat}}" data-lon="{{.Lon}}" data-radius="{{.RadiusM}}">编辑</button>
            <form method="post" action="/admin/fog/mask/delete" style="display:inline"
                  onsubmit="return confirm('删除后这块范围的迷雾会重新对访客显示。确认删除？')">
              <input type="hidden" name="id" value="{{.ID}}">
              <button class="btn sm" type="submit">删除</button>
            </form>
          </td>
        </tr>
      {{end}}
      </tbody>
    </table>
    {{else}}
      <div class="muted">还没有遮罩区。在地图上点选圆心、设置半径后保存即可。</div>
    {{end}}
    <div class="card-sub" style="margin-top:10px">遮罩只影响访客：站长登录状态下看到的始终是完整迷雾。</div>
  </div>
</div>

<script>
(function () {
  // Leaflet 由 layout 在 content 之后引入，脚本执行时 window.L 还没有，
  // 必须等 load 事件之后再初始化，否则地图整个不出现（与后台「新增地点」同一条约定）
  function whenReady(cb) {
    if (document.readyState === 'complete') { setTimeout(cb, 0); return; }
    window.addEventListener('load', cb);
  }

  var el = document.getElementById('mask-map');
  var form = document.getElementById('mask-form');
  if (!el || !form) return;
  var latIn = form.querySelector('[name=lat]'), lonIn = form.querySelector('[name=lon]');
  var idIn = form.querySelector('[name=id]'), nameIn = form.querySelector('[name=name]');
  var radiusIn = form.querySelector('[name=radius_m]'), crsIn = form.querySelector('[name=crs]');
  var hint = document.getElementById('mask-hint');
  var saveBtn = document.getElementById('mask-save');

  // 底图走站点配置（与后台「新增地点」同一套取法）：带密钥的图层由服务端转发，
  // 免密钥的是浏览器直连的 {s} 模板，不能硬写 /tiles/ 路由
  var fallback = {
    def: { url: 'https://webrd0{s}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=8&x={x}&y={y}&z={z}', maxZoom: 18, attr: '© 高德地图', crs: 'gcj02' },
    subs: ['1', '2', '3', '4']
  };

  function init(cfg) {
    var def = cfg.def;
    var map = L.map(el).setView([34.5, 108.9], 4);
    L.tileLayer(def.url, { subdomains: cfg.subs, maxZoom: def.maxZoom || 18, minZoom: 3, attribution: def.attr || '' }).addTo(map);
    crsIn.value = def.crs || 'gcj02';

    // 已有遮罩区画出来（只读），供对照
    var existing = L.layerGroup().addTo(map);
    [].forEach.call(document.querySelectorAll('[data-edit]'), function (b) {
      var lat = parseFloat(b.dataset.lat), lon = parseFloat(b.dataset.lon), r = parseFloat(b.dataset.radius);
      L.marker([lat, lon], { opacity: 0.65 }).addTo(existing);
      L.circle([lat, lon], { radius: r, color: '#d9534f', weight: 1.5, fillOpacity: 0.12 }).addTo(existing);
    });

    var marker = null, circle = null;
    function place(lat, lon) {
      if (!marker) {
        marker = L.marker([lat, lon], { draggable: true }).addTo(map);
        marker.on('drag', function (e) { circle.setLatLng(e.target.getLatLng()); });
        marker.on('dragend', function (e) { fillCoord(e.target.getLatLng()); });
      } else {
        marker.setLatLng([lat, lon]);
      }
      if (!circle) {
        circle = L.circle([lat, lon], { radius: parseFloat(radiusIn.value) || 500, color: '#d9534f', fillOpacity: 0.18 }).addTo(map);
      } else {
        circle.setLatLng([lat, lon]);
      }
    }
    function fillCoord(ll) { latIn.value = ll.lat.toFixed(6); lonIn.value = ll.lng.toFixed(6); }

    radiusIn.addEventListener('input', function () {
      if (circle) circle.setRadius(Math.max(50, parseFloat(radiusIn.value) || 500));
    });
    map.on('click', function (e) { place(e.latlng.lat, e.latlng.lng); fillCoord(e.latlng); });
    marker = null;

    // 列表里的「编辑」：把该行灌进表单，地图上跟过去
    [].forEach.call(document.querySelectorAll('[data-edit]'), function (b) {
      b.addEventListener('click', function () {
        idIn.value = b.dataset.id;
        nameIn.value = b.dataset.name || '';
        radiusIn.value = Math.round(parseFloat(b.dataset.radius) || 500);
        var lat = parseFloat(b.dataset.lat), lon = parseFloat(b.dataset.lon);
        place(lat, lon);
        fillCoord({ lat: lat, lng: lon });
        map.setView([lat, lon], 13);
        saveBtn.textContent = '保存修改';
        hint.textContent = '正在编辑「' + (b.dataset.name || b.dataset.id) + '」，也可以在地图上点选新圆心';
        el.scrollIntoView({ block: 'center', behavior: 'smooth' });
      });
    });

    document.getElementById('mask-reset').addEventListener('click', function () {
      form.reset();
      idIn.value = '';
      radiusIn.value = 500;
      if (marker) { map.removeLayer(marker); marker = null; }
      if (circle) { map.removeLayer(circle); circle = null; }
      saveBtn.textContent = '保存';
      hint.textContent = '在下方地图上点选圆心';
    });
  }

  whenReady(function () {
    if (!window.L) return;
    fetch('/api/map-config', { headers: { 'Accept': 'application/json' } })
      .then(function (r) { return r.json(); })
      .then(function (c) {
        var def = (c && c.base && c.base.length) ? c.base[0] : fallback.def;
        init({ def: def, subs: (c && c.subs && c.subs.length) ? c.subs : fallback.subs });
      })
      .catch(function () { init(fallback); });
  });
})();
</script>
{{end}}