/* =====================================================================
   L2 Physical Topology — display-only interactive map.
   Groups switches into frames (COBCO outer → workshop/DataCenter/Core),
   colours links by speed, nodes by latency & alarm, supports dark mode,
   terminal show / only-offline, live + historical snapshots, MAC/IP search.
   ===================================================================== */
(function () {
  'use strict';

  var CFG = window.L2_CFG || {};
  var T = window.L2_I18N || {};
  var META = window.L2_META || {};
  var SNAP = window.L2SNAP || null;

  var colors = CFG.colors || {100:'#F39C12',1000:'#2ECC71',10000:'#3498DB',20000:'#9B59B6',unknown:'#E74C3C',down:'#C0392B'};
  var LATW = (CFG.latency_warn != null) ? +CFG.latency_warn : 3;
  var LATB = (CFG.latency_bad != null) ? +CFG.latency_bad : 5;

  var TIER_BG = {core:'#1F4E78', dist:'#2E75B6', access:'#548235'};
  var TIER_BG_DARK = {core:'#1B4A72', dist:'#2A5E93', access:'#3E6B2E'};
  var SEV_COLORS = ['#97AAB3','#7499FF','#FFC859','#FFA059','#E97659','#E45959'];

  var NODE_W = 156, NODE_H = 50, GX = 26, GY = 18, PADX = 20, PADY = 42;
  var DGAP_X = 18, DGAP_Y = 26;
  var GROUP_GAP_X = 46, GROUP_GAP_Y = 48, MAXW = 2800;
  // overview ("全景") tiles
  var TILE_W = 232, TILE_H = 116, TILE_GAP_X = 24, TILE_GAP_Y = 22;

  var cy = null;
  var dark = false;
  var showTerm = false;
  var onlyOff = false;
  var paused = false;
  var countdown = 0;
  var timer = null;
  var lastSnap = null;
  var viewGroup = null;       // null = overview, otherwise workshop label
  var detailNet = null;       // null/auto, 'SURVE' or 'OFFICE' inside a workshop
  var pathParent = {};        // child -> parent chain for hover highlighting
  var lockedPath = null;      // switch id whose path is locked by click

  function el(id) { return document.getElementById(id); }
  function t(k, d) { return (T[k] != null) ? T[k] : (d != null ? d : k); }

  /* ---------------- name parsing / grouping ---------------- */
  function parseName(name) {
    var r = {workshop:'', floor:'', cab:'', u:'', area:'', role:'', ip:''};
    if (!name) return r;
    var toks = String(name).split('-');
    for (var i = 0; i < toks.length; i++) {
      var tk = toks[i];
      if (/^\d{1,3}(\.\d{1,3}){3}$/.test(tk)) { r.ip = tk; continue; }
      if (!r.workshop && /^\d{4}$/.test(tk)) { r.workshop = tk; continue; }
      if (!r.floor && /^\d[A-Z]\w*$/i.test(tk)) {
        var m = /^(\d)([A-Z])(\w+)$/i.exec(tk);
        if (m) { r.floor = m[1]; r.cab = m[2]; r.u = m[3]; continue; }
      }
      if (!r.area && /^(OFFICE|SURVE|GRDA|DC|IDC|LAB|PROD)$/i.test(tk)) { r.area = tk.toUpperCase(); continue; }
      if (!r.role && /^(Dist|Access|Core)$/i.test(tk)) { r.role = tk; }
    }
    return r;
  }

  function labelFor(n) {
    var p = parseName(n.name);
    var l1 = [];
    if (p.workshop) l1.push(p.workshop);
    if (p.area) l1.push(p.area);
    if (!l1.length) {
      l1.push((n.name || '').split('-')[0] || n.ip);
    }
    var l2 = [];
    if (p.floor) { var loc = p.floor + 'F' + (p.cab || '') + (p.u ? '-' + p.u + 'U' : ''); l1.push(loc); }
    if (p.role) l2.push(p.role);
    l2.push(n.ip);
    return l1.join(' · ') + '\n' + l2.join(' · ');
  }

  function detailLabel(n) {
    var s = labelFor(n);
    if (viewGroup) {
      var p = viewGroup + ' · ';
      if (s.indexOf(p) === 0) s = s.substring(p.length);
    }
    return s;
  }

  function rowLabel(n) {
    var s = String((n && n.name) || (n && n.ip) || '');
    s = s.replace(/^COBCO-/i, '');
    if (viewGroup) {
      try { s = s.replace(new RegExp('^' + viewGroup + '-', 'i'), ''); } catch (e) {}
    }
    return s;
  }

  function rootLabel(n) {
    var s = rowLabel(n);
    var m = /^(.+?)-(SURVE|OFFICE|OTHER)-(Dist|Access)-(.+)$/i.exec(s);
    if (m) return m[2].toUpperCase() + ' · ' + m[1] + '\n' + m[3] + ' · ' + m[4];
    return s;
  }

  function expandLabel(tpl, m) {
    return String(tpl).replace(/\$(\d)/g, function (_, d) { return m && m[+d] != null ? m[+d] : ''; });
  }

  function groupOf(n) {
    var name = n.name || n.ip || '';
    var rules = CFG.group_rules || [];
    for (var i = 0; i < rules.length; i++) {
      var r = rules[i];
      if (r.match === 'regex') {
        var re;
        try { re = new RegExp(r.pattern); } catch (e) { continue; }
        var m = re.exec(name);
        if (m) return {label: expandLabel(r.label, m) || (CFG.other_label || 'Other'), big: !!r.big};
      } else {
        if (name.toLowerCase().indexOf(String(r.pattern).toLowerCase()) >= 0) return {label: r.label || (CFG.other_label || 'Other'), big: !!r.big};
      }
    }
    return {label: CFG.other_label || 'Other', big: false};
  }

  /* ---------------- overview layout (workshop tiles) ---------------- */
  function groupStats(snap) {
    var map = {};
    var nodeById = {};
    (snap.nodes || []).forEach(function (n) {
      nodeById[n.id] = n;
      var g = groupOf(n);
      var s = map[g.label] || (map[g.label] = {label: g.label, big: g.big, nodes: [], alarms: 0, offline: 0, maxsev: -1, latmax: 0, up: 0});
      s.nodes.push(n);
      s.offline += (+n.term_offline || 0);
      if (n.alarms && n.alarms.length) {
        s.alarms += n.alarms.length;
        var sev = (n.maxsev != null && +n.maxsev >= 0) ? +n.maxsev : -1;
        n.alarms.forEach(function (a) { if (a && a.sev != null && +a.sev > sev) sev = +a.sev; });
        if (sev > s.maxsev) s.maxsev = sev;
      }
      if (n.latency_ms != null && +n.latency_ms > s.latmax) s.latmax = +n.latency_ms;
    });
    (snap.edges || []).forEach(function (e) {
      var a = nodeById[e.source], b = nodeById[e.target];
      if (!a || !b) return;
      var ga = groupOf(a), gb = groupOf(b);
      if (ga.label === gb.label) return;
      // count links that leave this workshop towards a core switch
      if ((/core/i.test(a.tier || '') || /core/i.test(a.name || '')) && map[gb.label]) map[gb.label].up++;
      if ((/core/i.test(b.tier || '') || /core/i.test(b.name || '')) && map[ga.label]) map[ga.label].up++;
    });
    return map;
  }

  function groupRank(l) {
    if (/core/i.test(l)) return 0;
    if (/data\s*center/i.test(l)) return 1;
    var m = /^(\d{4})([A-Za-z]?)$/.exec(l);
    if (m) return 1000 + parseInt(m[1], 10) * 40 + (m[2] ? m[2].toUpperCase().charCodeAt(0) - 64 : 0);
    return 5000;
  }

  function computeOverview(snap) {
    var stats = groupStats(snap);
    var labels = Object.keys(stats).sort(function (a, b) { return groupRank(a) - groupRank(b); });
    var special = labels.filter(function (l) { return groupRank(l) < 1000; });
    var others = labels.filter(function (l) { return groupRank(l) >= 1000; });

    var COLS = Math.max(4, Math.min(7, Math.ceil(Math.sqrt(Math.max(1, others.length)))));
    var gridW = COLS * TILE_W + (COLS - 1) * TILE_GAP_X;
    var pos = {}, tiles = [], y = 0;

    if (special.length) {
      var sW = special.length * TILE_W + (special.length - 1) * TILE_GAP_X;
      var sx = Math.max(0, (gridW - sW) / 2);
      special.forEach(function (l) {
        tiles.push({label: l, x: sx, y: y, w: TILE_W, h: TILE_H});
        pos[l] = {x: sx + TILE_W / 2, y: y + TILE_H / 2};
        sx += TILE_W + TILE_GAP_X;
      });
      y += TILE_H + 46;
    }

    var maxX = gridW, maxY = y;
    for (var i = 0; i < others.length; i += COLS) {
      var row = others.slice(i, i + COLS);
      var rW = row.length * TILE_W + (row.length - 1) * TILE_GAP_X;
      var rx = Math.max(0, (gridW - rW) / 2);
      row.forEach(function (l, j) {
        tiles.push({label: l, x: rx + j * (TILE_W + TILE_GAP_X), y: y, w: TILE_W, h: TILE_H});
        pos[l] = {x: rx + j * (TILE_W + TILE_GAP_X) + TILE_W / 2, y: y + TILE_H / 2};
      });
      y += TILE_H + TILE_GAP_Y;
      maxY = y - TILE_GAP_Y;
      maxX = Math.max(maxX, rx + rW);
    }

    var root = {x: -34, y: -64, w: maxX + 68, h: maxY + 64 + 40};
    root.cx = root.x + root.w / 2; root.cy = root.y + root.h / 2;
    return {stats: stats, labels: labels, pos: pos, tiles: tiles, root: root};
  }

  function aggregateEdges(snap) {
    var gid = {};
    (snap.nodes || []).forEach(function (n) { gid[n.id] = groupOf(n).label; });
    var pairs = {};
    (snap.edges || []).forEach(function (e) {
      var a = gid[e.source], b = gid[e.target];
      if (!a || !b || a === b) return;
      var k = (a < b) ? (a + '\u0001' + b) : (b + '\u0001' + a);
      var p = pairs[k] || (pairs[k] = {a: a, b: b, count: 0, speed: 0, down: false});
      p.count++;
      if ((parseFloat(e.speed) || 0) > p.speed) p.speed = parseFloat(e.speed) || 0;
      if (e.state && e.state !== 'up') p.down = true;
    });
    return Object.keys(pairs).map(function (k) { return pairs[k]; });
  }

  /* ---------------- detail layout (one workshop, left-to-right tree) ---------------- */
  function floorInfo(n) {
    var toks = String((n && n.name) || '').split('-');
    for (var i = 0; i < toks.length; i++) {
      var tk = toks[i];
      var bm = /^B(\d+)$/i.exec(tk);
      if (bm) { var bn = parseInt(bm[1], 10); return {key: 'B' + bn, label: 'B' + bn, rank: -200 + bn}; }
      if (/^GRD/i.test(tk)) return {key: 'GRD', label: 'GRD', rank: -100};
      var fm = /^(\d+(?:\.\d+)?)F/i.exec(tk);
      if (fm) {
        var num = parseFloat(fm[1]);
        var txt = (num % 1 ? num.toFixed(1) : String(num)) + 'F';
        return {key: txt, label: txt, rank: num * 10};
      }
      var cm = /^(\d)([A-Z])(\w+)$/i.exec(tk);
      if (cm) {
        var n2 = parseInt(cm[1], 10);
        return {key: n2 + 'F', label: n2 + 'F', rank: n2 * 10};
      }
    }
    return {key: 'NA', label: t('l2.floor_na', 'Other'), rank: -500};
  }

  function baseNetworkOf(n) {
    var s = String((n && n.name) || '').toUpperCase();
    if (s.indexOf('SURVE') >= 0) return 'SURVE';
    if (s.indexOf('OFFICE') >= 0) return 'OFFICE';
    var ip = String((n && n.ip) || '');
    if (/^10\.169\./.test(ip)) return 'SURVE';
    if (/^10\.160\./.test(ip)) return 'OFFICE';
    return 'OTHER';
  }
  function networkOf(n) { return baseNetworkOf(n); }

  function networkLabel(key) {
    if (key === 'SURVE') return t('l2.net_surve', 'SURVE 监控网');
    if (key === 'OFFICE') return t('l2.net_office', 'OFFICE 办公网');
    return t('l2.net_other', '其他网络');
  }

  function computeDetail(snap, label) {
    var all = snap.nodes || [];
    var byId = {}, groupNodes = [];
    all.forEach(function (n) { byId[n.id] = n; if (groupOf(n).label === label) groupNodes.push(n); });

    // Split one workshop by physical network first: office and surveillance never mix.
    var gids = {}, rawAdj = {};
    groupNodes.forEach(function (n) { gids[n.id] = true; rawAdj[n.id] = []; });
    (snap.edges || []).forEach(function (e) {
      if (gids[e.source] && gids[e.target]) { rawAdj[e.source].push(e.target); rawAdj[e.target].push(e.source); }
    });
    var netMap = {};
    groupNodes.forEach(function (n) { netMap[n.id] = baseNetworkOf(n); });
    // Unlabelled access switches inherit the network of the distribution they hang from.
    for (var pass = 0; pass < 4; pass++) {
      groupNodes.forEach(function (n) {
        if (netMap[n.id] !== 'OTHER') return;
        var votes = {};
        rawAdj[n.id].forEach(function (id) {
          var k = netMap[id];
          if (k && k !== 'OTHER') votes[k] = (votes[k] || 0) + 1;
        });
        var best = null, bestN = 0;
        Object.keys(votes).forEach(function (k) { if (votes[k] > bestN) { best = k; bestN = votes[k]; } });
        if (best) netMap[n.id] = best;
      });
    }
    var counts = {}, nets = [];
    groupNodes.forEach(function (n) {
      var k = netMap[n.id];
      if (!counts[k]) { counts[k] = 0; nets.push(k); }
      counts[k]++;
    });
    nets.sort(function (a, b) {
      if (a === 'SURVE') return -1;
      if (b === 'SURVE') return 1;
      if (a === 'OFFICE') return -1;
      if (b === 'OFFICE') return 1;
      return counts[b] - counts[a];
    });
    var activeNet = (detailNet && counts[detailNet]) ? detailNet : (nets.length ? nets[0] : 'OTHER');
    var nodes = groupNodes.filter(function (n) { return netMap[n.id] === activeNet; });
    var ids = {};
    nodes.forEach(function (n) { ids[n.id] = true; });
    var internal = [], external = [];
    (snap.edges || []).forEach(function (e) {
      var a = ids[e.source], b = ids[e.target];
      if (a && b) internal.push(e);
      else if (a || b) external.push(e);
    });

    var adj = {};
    nodes.forEach(function (n) { adj[n.id] = []; });
    internal.forEach(function (e) { adj[e.source].push(e.target); adj[e.target].push(e.source); });

    // Distribution switches are the left-hand roots of the workshop tree.
    var dists = nodes.filter(function (n) { return /dist/i.test(n.tier || '') && /dist/i.test(n.name || ''); })
      .sort(function (a, b) { return (adj[b.id].length - adj[a.id].length) || String(a.name).localeCompare(String(b.name)); });
    if (!dists.length) {
      var cand = nodes.slice().sort(function (a, b) { return adj[b.id].length - adj[a.id].length; })[0];
      if (cand) dists = [cand];
    }
    // One physical root per network tab; peer/redundant distribution switches are listed below it.
    if (dists.length > 1) dists = [dists[0]];

    // Group all non-distribution switches into floor buckets (GRD lowest, then 1F/2F/3F...).
    var floorMap = {};
    nodes.forEach(function (n) {
      if (dists.indexOf(n) >= 0) return;
      if (/core/i.test(n.tier || '')) return;
      var fi = floorInfo(n);
      var f = floorMap[fi.key] || (floorMap[fi.key] = {key: fi.key, label: fi.label, rank: fi.rank, nodes: []});
      f.nodes.push(n);
    });
    var floors = Object.keys(floorMap).map(function (k) { return floorMap[k]; });
    floors.forEach(function (f) {
      f.nodes.sort(function (a, b) {
        var pa = parseName(a.name), pb = parseName(b.name);
        var ca = (pa.cab || '') + (pa.u || ''), cb = (pb.cab || '') + (pb.u || '');
        if (ca !== cb) return ca.localeCompare(cb);
        return String(a.name).localeCompare(String(b.name));
      });
    });
    // Highest floor at the top, GRD at the bottom.
    floors.sort(function (a, b) { return b.rank - a.rank; });

    var WORK_L = 300, FLOOR_X = 520, DIST_FRAME_W = 190, TOP_OFF = 34;
    var ROW_W = 380, ROW_H = 24, ROW_GAP = 8, FLOOR_HEAD = 28, FLOOR_GAP = 12;
    var floorW = ROW_W + PADX * 2 + 110;
    floors.forEach(function (f) {
      f.cols = 1;
      f.rows = f.nodes.length;
      f.innerW = ROW_W;
      f.h = FLOOR_HEAD + f.rows * ROW_H + Math.max(0, f.rows - 1) * ROW_GAP + 10;
    });
    var workRight = FLOOR_X + floorW + 14;
    var workW = workRight - WORK_L;
    var pos = {}, top = 44 + TOP_OFF;
    floors.forEach(function (f) {
      f.frame = {x: FLOOR_X, y: top, w: floorW, h: f.h};
      f.nodes.forEach(function (n, i) {
        pos[n.id] = {
          x: FLOOR_X + PADX + ROW_W / 2,
          y: top + FLOOR_HEAD + i * (ROW_H + ROW_GAP) + ROW_H / 2
        };
      });
      top += f.h + FLOOR_GAP;
    });
    var workH = Math.max(220, top + 6);
    var distFrame = dists.length ? {x: WORK_L + 8, y: 44 + TOP_OFF, w: DIST_FRAME_W, h: workH - (44 + TOP_OFF) - 14} : null;
    var distX = WORK_L + 8 + DIST_FRAME_W / 2;
    if (dists.length) {
      var childYs = floors.reduce(function (acc, f) {
        return acc.concat(f.nodes.map(function (n) { return pos[n.id] ? pos[n.id].y : 0; }));
      }, []);
      var cy = childYs.length ? (Math.min.apply(null, childYs) + Math.max.apply(null, childYs)) / 2 : distFrame.y + distFrame.h / 2;
      pos[dists[0].id] = {x: distX, y: cy};
    }
    var missing = nodes.filter(function (n) { return !pos[n.id]; });
    missing.forEach(function (n, i) {
      pos[n.id] = {x: distX, y: (distFrame ? distFrame.y + 30 : 80) + i * (NODE_H + 12)};
    });

    // One ghost core per external core→distribution uplink, aligned left of its distribution switch.
    var ghosts = [], ghostSeen = {};
    external.forEach(function (e) {
      var inside = ids[e.source] ? e.source : e.target;
      var outside = ids[e.source] ? e.target : e.source;
      if (!pos[inside] || !byId[outside]) return;
      // Only a real core uplink gets a ghost; other cross-group edges are not drawn as cores.
      if (!/core/i.test(byId[outside].tier || '') && !/core/i.test(byId[outside].name || '')) return;
      var key = outside + '|' + inside;
      if (ghostSeen[key]) return;
      var g = {id: 'gh_' + outside + '_' + inside, to: inside, node: byId[outside], speed: e.speed, state: e.state};
      ghostSeen[key] = g;
      ghosts.push(g);
    });
    var ghostAt = {};
    ghosts.forEach(function (g) {
      var base = pos[g.to];
      var k = ghostAt[g.to] || 0;
      ghostAt[g.to] = k + 1;
      g.x = 92;
      g.y = base.y + (k ? (k % 2 ? 1 : -1) * 46 * Math.ceil(k / 2) : 0);
    });

    // Root each tree at the distribution switch; remember every child's parent for path highlighting.
    var parentOf = {}, ghostOfDist = {};
    ghosts.forEach(function (g) { if (!ghostOfDist[g.to]) ghostOfDist[g.to] = g.id; });
    var seen = {};
    dists.forEach(function (d) {
      if (seen[d.id]) return;
      seen[d.id] = true;
      parentOf[d.id] = ghostOfDist[d.id] || null;
      var queue = [d.id];
      while (queue.length) {
        var cur = queue.shift();
        adj[cur].forEach(function (nb) {
          if (seen[nb]) return;
          seen[nb] = true;
          parentOf[nb] = cur;
          queue.push(nb);
        });
      }
    });
    nodes.forEach(function (n) { if (!seen[n.id]) seen[n.id] = true; });

    var workshop = {x: WORK_L, y: 0, w: workW, h: workH, label: label + '  ·  ' + networkLabel(activeNet) + '  ·  ' + nodes.length + ' ' + t('l2.unit_sw', 'sw')};
    var distFrameFull = distFrame ? {
      x: distFrame.x, y: distFrame.y, w: distFrame.w, h: distFrame.h,
      label: t('l2.dist', 'Distribution') + '  ·  ' + dists.length
    } : null;
    floors.forEach(function (f) {
      f.frame.label = f.label + '  ·  ' + f.nodes.length + ' ' + t('l2.unit_sw', 'sw');
    });

    var root = {x: -20, y: -48, w: workRight + 40, h: workH + 80};
    root.cx = root.x + root.w / 2; root.cy = root.y + root.h / 2;
    return {
      nodes: nodes, byId: byId, pos: pos, ghosts: ghosts, parentOf: parentOf,
      dists: dists, floors: floors, frames: {workshop: workshop, dist: distFrameFull},
      root: root, totalW: workRight, ids: ids, internal: internal,
      nets: nets.map(function (k) { return {key: k, count: counts[k]}; }), activeNet: activeNet, totalNodes: groupNodes.length
    };
  }

  /* ---------------- speed colour ---------------- */
  function speedColor(speed, state) {
    if (state && state !== 'up') return colors.down;
    var s = parseFloat(speed);
    if (!isFinite(s) || s <= 0) return colors.unknown;
    if (s <= 100) return colors['100'];
    if (s <= 1000) return colors['1000'];
    if (s <= 10000) return colors['10000'];
    return colors['20000'];
  }
  function speedWidth(speed) {
    var s = parseFloat(speed) || 0;
    if (s >= 20000) return 4.5;
    if (s >= 10000) return 3.6;
    if (s >= 1000) return 2.6;
    return 1.8;
  }
  function speedText(speed) {
    var s = parseFloat(speed) || 0;
    if (!s) return '?';
    if (s >= 1000) return (s / 1000) + 'G';
    return s + 'M';
  }

  /* ---------------- style ---------------- */
  function styleFor(d) {
    var bg = d ? TIER_BG_DARK : TIER_BG;
    return [
      {selector: 'node', style: {
        'width': 'data(w)', 'height': 'data(h)', 'shape': 'round-rectangle',
        'background-color': 'data(bg)', 'border-width': 2, 'border-color': 'data(bd)',
        'label': 'data(label)', 'color': d ? '#eaf1fb' : '#ffffff',
        'font-size': 11.5, 'font-weight': 600, 'text-valign': 'center', 'text-halign': 'center',
        'text-wrap': 'wrap', 'text-max-width': NODE_W - 16, 'padding': '2px',
        'overlay-opacity': 0, 'z-index-compare': 'manual', 'z-index': 20
      }},
      {selector: 'node[type="frame"]', style: {
        'background-opacity': d ? 0.05 : 0.035, 'background-color': d ? '#5b7bb0' : '#8fa6c4',
        'border-width': 1.6, 'border-style': 'dashed', 'border-color': d ? '#3f5377' : '#c2ccdb',
        'label': 'data(label)', 'text-valign': 'top', 'text-halign': 'center',
        'font-size': 'data(fs)', 'font-weight': 800, 'color': d ? '#aebfd8' : '#526178',
        'text-margin-y': 8, 'padding': '0px', 'events': 'no', 'z-index-compare': 'manual', 'z-index': 2
      }},
      {selector: 'node[type="wsframe"]', style: {
        'background-opacity': d ? 0.025 : 0.018, 'background-color': d ? '#6f8fc4' : '#8fa6c4',
        'border-width': 2.2, 'border-style': 'solid', 'border-color': d ? '#4f6790' : '#9fb0c6',
        'label': 'data(label)', 'text-valign': 'top', 'text-halign': 'center', 'text-wrap': 'none',
        'font-size': 19, 'font-weight': 900, 'color': d ? '#d7e6ff' : '#2f4560',
        'text-margin-x': 0, 'text-margin-y': 8, 'padding': '0px', 'events': 'no',
        'z-index-compare': 'manual', 'z-index': 1
      }},
      {selector: 'node[type="floorframe"]', style: {
        'background-opacity': d ? 0.055 : 0.035, 'background-color': d ? '#5b7bb0' : '#8fa6c4',
        'border-width': 1.2, 'border-style': 'dashed', 'border-color': d ? '#3f5377' : '#b9c6d8',
        'label': 'data(label)', 'text-valign': 'top', 'text-halign': 'center', 'text-wrap': 'none',
        'font-size': 13, 'font-weight': 800, 'color': d ? '#a9c1e3' : '#425a78',
        'text-margin-x': 0, 'text-margin-y': 7, 'padding': '0px', 'events': 'no',
        'z-index-compare': 'manual', 'z-index': 2
      }},
      {selector: 'node[type="root"]', style: {
        'background-opacity': d ? 0.02 : 0.012, 'background-color': d ? '#7aa0d8' : '#8ea6c2',
        'border-width': 2.2, 'border-style': 'solid', 'border-color': d ? '#476492' : '#9fb0c6',
        'label': 'data(label)', 'text-valign': 'top', 'text-halign': 'center',
        'font-size': 28, 'font-weight': 900, 'color': d ? '#cfe0ff' : '#33465f',
        'text-margin-y': 10, 'events': 'no', 'z-index-compare': 'manual', 'z-index': 0
      }},
      {selector: 'node[type="tile"]', style: {
        'width': 'data(w)', 'height': 'data(h)', 'shape': 'round-rectangle',
        'background-color': 'data(bg)', 'background-opacity': 0.97,
        'border-width': 2.5, 'border-color': 'data(bd)',
        'label': 'data(label)', 'color': 'data(fg)',
        'font-size': 16, 'font-weight': 700, 'text-valign': 'center', 'text-halign': 'center',
        'text-wrap': 'wrap', 'text-max-width': TILE_W - 26, 'line-height': 1.45,
        'padding': '6px', 'overlay-opacity': 0, 'z-index-compare': 'manual', 'z-index': 20
      }},
      {selector: 'node[type="tile"].alarm', style: {'border-width': 5}},
      {selector: 'node[type="tile"].core', style: {'border-width': 3.5}},
      {selector: 'node[type="ghost"]', style: {
        'width': 190, 'height': 40, 'shape': 'round-rectangle',
        'background-color': d ? '#52667f' : '#c8d3e2', 'background-opacity': 0.55,
        'border-width': 1.2, 'border-style': 'dashed', 'border-color': d ? '#7d93ad' : '#8fa3bc',
        'label': 'data(label)', 'color': d ? '#dce8fa' : '#3b4f68',
        'font-size': 11, 'font-weight': 600, 'text-wrap': 'wrap', 'text-max-width': 176,
        'z-index-compare': 'manual', 'z-index': 15
      }},
      {selector: 'node[type="edgepoint"]', style: {
        'width': 1, 'height': 1, 'opacity': 0, 'events': 'no'
      }},
      {selector: 'node[type="term"]', style: {
        'width': 12, 'height': 12, 'shape': 'ellipse', 'background-color': 'data(bg)',
        'border-width': 1, 'border-color': d ? '#2a3648' : '#cfd8e3', 'label': '',
        'z-index-compare': 'manual', 'z-index': 30
      }},
      {selector: 'edge[type="tilelink"]', style: {
        'width': 'data(w)', 'line-color': 'data(color)', 'opacity': 0.55,
        'curve-style': 'bezier', 'target-arrow-shape': 'none',
        'z-index-compare': 'manual', 'z-index': 5
      }},
      {selector: 'edge[type="ghost"]', style: {
        'width': 1.2, 'line-color': d ? '#6b809b' : '#a9b6c8', 'line-style': 'dashed', 'opacity': 0.7,
        'curve-style': 'bezier', 'target-arrow-shape': 'none',
        'z-index-compare': 'manual', 'z-index': 8
      }},
      {selector: 'edge[type="uplink"]', style: {
        'width': 'data(w)', 'line-color': 'data(color)', 'line-style': 'data(ls)', 'opacity': 0.95,
        'curve-style': 'bezier', 'target-arrow-shape': 'none',
        'label': 'data(lbl)', 'font-size': 10, 'font-weight': 700,
        'color': d ? '#dce8fa' : '#25405f',
        'text-background-color': d ? '#0d1b2a' : '#ffffff', 'text-background-opacity': 0.88,
        'text-background-padding': '2px', 'text-rotation': 'autorotate',
        'z-index-compare': 'manual', 'z-index': 40
      }},
      {selector: 'edge', style: {
        'width': 'data(w)', 'line-color': 'data(color)', 'line-style': 'data(ls)',
        'curve-style': 'bezier', 'opacity': 0.92, 'target-arrow-shape': 'none',
        'z-index-compare': 'manual', 'z-index': 12
      }},
      {selector: 'edge[type="term"]', style: {
        'width': 0.7, 'line-color': d ? '#3b4a5e' : '#c5cfdb', 'opacity': 0.55,
        'curve-style': 'bezier', 'z-index-compare': 'manual', 'z-index': 11
      }},
      {selector: 'node.alarm', style: {'border-width': 6}},
      {selector: 'node.dim', style: {'opacity': 0.12}},
      {selector: 'edge.dim', style: {'opacity': 0.08}},
      {selector: 'edge.hl', style: {'width': 5, 'line-color': '#FFD54A', 'opacity': 1, 'z-index-compare': 'manual', 'z-index': 45}},
      {selector: 'node.lat-warn', style: {'border-color': '#F39C12'}},
      {selector: 'node.lat-bad', style: {'border-color': '#E74C3C', 'border-width': 6}},
      {selector: 'node.hl', style: {'border-color': '#ff0', 'border-width': 7, 'overlay-color': '#ff0', 'overlay-opacity': 0.25, 'overlay-padding': 6}},
      {selector: 'node.pathhl', style: {'border-width': 5, 'border-color': '#FFD54A', 'overlay-color': '#FFD54A', 'overlay-opacity': 0.2, 'overlay-padding': 4}},
      {selector: 'edge.pathhl', style: {'width': 5.5, 'line-color': '#FFD54A', 'opacity': 1}},
      {selector: 'edge.detail', style: {'opacity': 0.72, 'curve-style': 'straight', 'source-endpoint': '0% 50%', 'target-endpoint': '0% 50%'}},
      {selector: 'node[type="switch"]', style: {
        'background-color': function (e) { return e.data('bg'); },
        'text-max-width': 'data(tw)', 'text-wrap': 'none',
        'text-halign': 'center', 'font-size': 10.5
      }},
      {selector: 'node[type="switch"].root', style: {'text-wrap': 'wrap'}}
    ];
  }

  /* ---------------- render ---------------- */
  function applyElements(els) {
    if (!cy) {
      cy = cytoscape({
        container: el('l2-cy'),
        elements: els,
        style: styleFor(dark),
        layout: {name: 'preset', fit: true, padding: 40},
        wheelSensitivity: 0.2,
        minZoom: 0.15, maxZoom: 4
      });
      bindCy();
    } else {
      cy.elements().remove();
      cy.add(els);
      cy.style(styleFor(dark));
      cy.layout({name: 'preset', fit: true, padding: 40}).run();
    }
  }

  function render(snap) {
    if (!snap || !snap.nodes) {
      el('l2-cy').innerHTML = '<div class="l2-empty">' + t('l2.no_data', 'No data') + '</div>';
      return;
    }
    lastSnap = snap;
    if (viewGroup) {
      var exists = (snap.nodes || []).some(function (n) { return groupOf(n).label === viewGroup; });
      if (!exists) viewGroup = null;
    }
    if (viewGroup) renderDetail(snap); else renderOverview(snap);
    if (el('l2-back')) el('l2-back').style.display = viewGroup ? '' : 'none';
    updateStats(snap);
    buildLegend();
    buildAlarms(snap);
    buildOffline(snap);
  }

  function renderOverview(snap) {
    var O = computeOverview(snap), els = [], idx = {};
    var nb = el('l2-net-tabs'); if (nb) { nb.style.display = 'none'; nb.innerHTML = ''; }
    if (O.root) {
      els.push({group: 'nodes', data: {id: '__root', type: 'root', label: CFG.root_label || 'COBCO', w: O.root.w, h: O.root.h},
        position: {x: O.root.cx, y: O.root.cy}, selectable: false, grabbable: false});
    }
    O.tiles.forEach(function (tile, i) {
      var s = O.stats[tile.label] || {nodes: [], alarms: 0, offline: 0, maxsev: -1};
      idx[tile.label] = 'grp_' + i;
      var isCore = /core/i.test(tile.label) || /data\s*center/i.test(tile.label);
      var bd = s.alarms ? '#E45959' : (dark ? '#41597c' : '#b9c8dc');
      var bg = isCore ? TIER_BG.core : (dark ? '#22344e' : '#eef3fb');
      var fg = isCore ? '#ffffff' : (dark ? '#dfe9fb' : '#1e3352');
      var lbl = tile.label + '\n' + s.nodes.length + ' ' + t('l2.unit_sw', 'sw') +
        (s.up ? '   ↑ ' + s.up : '') + (s.alarms ? '   ⚠ ' + s.alarms : '') + (s.offline ? '   ◌ ' + s.offline : '');
      var cls = [];
      if (s.alarms) cls.push('alarm');
      if (isCore) cls.push('core');
      els.push({group: 'nodes', data: {
        id: idx[tile.label], type: 'tile', group: tile.label,
        n: s.nodes.length, alarms: s.alarms, offline: s.offline, maxsev: s.maxsev, up: s.up,
        label: lbl, bg: bg, fg: fg, bd: bd, w: TILE_W, h: TILE_H
      }, position: {x: tile.x + tile.w / 2, y: tile.y + tile.h / 2}, classes: cls.join(' ')});
    });
    applyElements(els);
  }

  function renderNetTabs(D) {
    var box = el('l2-net-tabs');
    if (!box) return;
    box.innerHTML = '';
    if (!D.nets || D.nets.length < 2) { box.style.display = 'none'; return; }
    box.style.display = 'flex';
    D.nets.forEach(function (n) {
      var b = document.createElement('button');
      b.type = 'button';
      b.className = 'l2-net-tab' + (n.key === D.activeNet ? ' active' : '');
      b.textContent = networkLabel(n.key) + ' · ' + n.count + ' ' + t('l2.unit_sw', 'sw');
      b.addEventListener('click', function () { detailNet = n.key; render(lastSnap); });
      box.appendChild(b);
    });
  }

  function renderDetail(snap) {
    var D = computeDetail(snap, viewGroup), els = [];
    renderNetTabs(D);
    function frameEl(id, type, fr) {
      els.push({group: 'nodes', data: {id: id, type: type, label: fr.label, w: fr.w, h: fr.h},
        position: {x: fr.x + fr.w / 2, y: fr.y + fr.h / 2}, selectable: false, grabbable: false});
    }
    frameEl('__ws', 'wsframe', {x: D.frames.workshop.x, y: 36, w: D.frames.workshop.w, h: D.frames.workshop.h + 36, label: D.frames.workshop.label});
    if (D.frames.dist) frameEl('__dist', 'floorframe', D.frames.dist);
    D.floors.forEach(function (f, i) { frameEl('__floor_' + i, 'floorframe', f.frame); });

    (D.ghosts || []).forEach(function (g) {
      var nm = (g.node && g.node.name) || g.id;
      var ip = (g.node && g.node.ip) || '';
      var tail = String(nm).split(/[-\s]+/).filter(Boolean).slice(-1)[0] || '';
      var short = (tail ? tail + ' · ' : '') + ip;
      els.push({group: 'nodes', data: {id: g.id, type: 'ghost', label: short}, position: {x: g.x, y: g.y}, selectable: false, grabbable: false});
      els.push({group: 'edges', data: {
        id: 'ghe_' + g.id, type: 'uplink', source: g.id, target: g.to,
        speed: g.speed, state: g.state, lbl: speedText(g.speed),
        color: speedColor(g.speed, g.state), ls: (g.state && g.state !== 'up') ? 'dashed' : 'solid',
        w: Math.max(2.6, speedWidth(g.speed))
      }});
    });
    var switchIds = {};
    D.nodes.forEach(function (n, ni) {
      switchIds[n.id] = true;
      var p = D.pos[n.id] || {x: 0, y: 0};
      var tier = n.tier || 'access';
      var tkey = (tier.indexOf('dist') === 0) ? 'dist' : (tier.indexOf('core') === 0 ? 'core' : 'access');
      var isRoot = D.dists && D.dists.length && n.id === D.dists[0].id;
      var cls = [];
      var bd = (dark ? TIER_BG_DARK[tkey] : TIER_BG[tkey]) || '#555';
      var bg = (dark ? TIER_BG_DARK[tkey] : TIER_BG[tkey]) || '#777';
      if (!isRoot && ni % 2 === 1) bg = dark ? '#4f8a3a' : '#6ca75a';
      if (n.alarms && n.alarms.length) {
        cls.push('alarm');
        bd = '#E45959';
      }
      if (n.latency_ms != null) {
        if (+n.latency_ms > LATB) cls.push('lat-bad');
        else if (+n.latency_ms > LATW) cls.push('lat-warn');
      }
      if (isRoot) cls.push('root');
      els.push({group: 'nodes', data: {
        id: n.id, type: 'switch', name: n.name, ip: n.ip, tier: tier, depth: n.depth,
        hostid: n.hostid, oper: n.oper, maxsev: n.maxsev, alarms: n.alarms || [],
        term_online: n.term_online, term_offline: n.term_offline, latency_ms: n.latency_ms,
        label: isRoot ? rootLabel(n) : rowLabel(n), tw: isRoot ? 150 : 360,
        bg: bg, bd: isRoot ? bd : '#25501e',
        w: isRoot ? 170 : 380, h: isRoot ? 50 : 24, group: viewGroup
      }, position: p, classes: cls.join(' ')});
    });
    D.internal.forEach(function (e, i) {
      var root = D.dists && D.dists[0];
      if (root && (e.source === root.id || e.target === root.id)) {
        var childId = e.source === root.id ? e.target : e.source;
        var pp = D.pos[root.id], cp = D.pos[childId];
        if (pp && cp) {
          var sp = 'sp_' + i, tp = 'tp_' + i;
          // Exact left-edge midpoints, straight line. The parent label is
          // allowed to cover the line where it exits the parent.
          els.push({group: 'nodes', data: {id: sp, type: 'edgepoint'}, position: {x: pp.x - 86, y: pp.y}, selectable: false, grabbable: false});
          els.push({group: 'nodes', data: {id: tp, type: 'edgepoint'}, position: {x: cp.x - 191, y: cp.y}, selectable: false, grabbable: false});
          els.push({group: 'edges', data: {
            id: 'e_' + i, type: 'detail', source: sp, target: tp, p: root.id, c: childId,
            speed: e.speed, state: e.state, a_port: e.a_port, b_port: e.b_port,
            color: speedColor(e.speed, e.state), ls: (e.state && e.state !== 'up') ? 'dashed' : 'solid',
            w: Math.min(2.4, speedWidth(e.speed))
          }, classes: 'detail'});
          return;
        }
      }
      els.push({group: 'edges', data: {
        id: 'e_' + i, source: e.source, target: e.target, speed: e.speed, state: e.state,
        a_port: e.a_port, b_port: e.b_port,
        color: speedColor(e.speed, e.state), ls: (e.state && e.state !== 'up') ? 'dashed' : 'solid',
        w: Math.min(2.4, speedWidth(e.speed))
      }, classes: 'detail'});
    });
    if (showTerm) {
      var bySw = {};
      (snap.terminals || []).forEach(function (tm) {
        if (!switchIds[tm.sw_ip]) return;
        if (onlyOff && tm.online) return;
        (bySw[tm.sw_ip] = bySw[tm.sw_ip] || []).push(tm);
      });
      Object.keys(bySw).forEach(function (sw) {
        var base = D.pos[sw]; if (!base) return;
        bySw[sw].sort(function (a, b) { return (a.online === b.online) ? 0 : (a.online ? -1 : 1); });
        bySw[sw].forEach(function (tm, k) {
          var col = k % 9, row = Math.floor(k / 9);
          var x = base.x - 54 + col * 13;
          var y = base.y + NODE_H / 2 + 16 + row * 13;
          els.push({group: 'nodes', data: {id: 't_' + tm.mac, type: 'term', bg: tm.online ? '#2ECC71' : '#95a5a6', mac: tm.mac, ip: tm.ip, online: tm.online},
            position: {x: x, y: y}, selectable: false});
          els.push({group: 'edges', data: {id: 'te_' + tm.mac, type: 'term', source: sw, target: 't_' + tm.mac}});
        });
      });
    }
    pathParent = D.parentOf || {};
    lockedPath = null;
    applyElements(els);
  }

  /* ---------------- side panels & stats ---------------- */
  function updateStats(snap) {
    var s = snap.stats || {};
    var txt = '● ' + (s.switches || 0) + '  |  ⇄ ' + (s.edges || 0) + '  |  ' +
      (s.term_total || 0) + '(' + (s.term_online || 0) + '/' + (s.term_offline || 0) + ')  |  ⚠ ' + (s.alarms || 0);
    var up = snap.generated_iso ? ('  ·  ' + t('l2.updated', 'Updated') + ' ' + snap.generated_iso) : '';
    el('l2-stats').textContent = txt + up;
  }

  function buildLegend() {
    var h = '';
    function sw(c, label, dashed) { return '<div class="lg-row"><span class="lg-line' + (dashed ? ' lg-dash' : '') + '" style="border-top-color:' + c + '"></span>' + label + '</div>'; }
    h += '<div class="lg-title">' + t('l2.legend_speed', 'Link speed') + '</div>';
    h += sw(colors['100'], '100M') + sw(colors['1000'], '1G') + sw(colors['10000'], '10G') + sw(colors['20000'], '20G+');
    h += sw(colors.unknown, t('lbl.color_unknown', 'Unknown'));
    h += sw(colors.down, t('lbl.color_down', 'Down'), true);
    h += '<div class="lg-title">' + t('l2.legend_tier', 'Tier') + '</div>';
    h += '<div class="lg-row"><span class="lg-box" style="background:' + TIER_BG.core + '"></span>' + t('l2.core', 'Core') +
         '<span class="lg-box" style="background:' + TIER_BG.dist + ';margin-left:8px"></span>' + t('l2.dist', 'Distribution') +
         '<span class="lg-box" style="background:' + TIER_BG.access + ';margin-left:8px"></span>' + t('l2.access', 'Access') + '</div>';
    h += '<div class="lg-title">' + t('l2.legend_lat', 'Latency') + '</div>';
    h += '<div class="lg-row"><span class="lg-box" style="background:#F39C12;border-radius:2px"></span>&gt;' + LATW + 'ms' +
         '<span class="lg-box" style="background:#E74C3C;border-radius:2px;margin-left:8px"></span>&gt;' + LATB + 'ms</div>';
    h += '<div class="lg-row"><span class="lg-box" style="background:#E45959;border-radius:2px"></span>' + t('l2.alarms', 'Alarms') + '</div>';
    h += '<div class="lg-row"><span class="lg-box" style="background:#2ECC71;border-radius:50%"></span>' + t('l2.term_on', 'Online') +
         '<span class="lg-box" style="background:#95a5a6;border-radius:50%;margin-left:8px"></span>' + t('l2.term_off', 'Offline') + '</div>';
    h += '<div class="lg-row" style="opacity:.72;margin-top:4px">' + t('l2.click_hint', 'Hover a switch to highlight its full upstream path') + '</div>';
    el('l2-legend').innerHTML = h;
  }

  function buildAlarms(snap) {
    var items = [];
    (snap.nodes || []).forEach(function (n) {
      if (n.maxsev != null && n.maxsev >= 0 && n.alarms && n.alarms.length) {
        n.alarms.forEach(function (a) {
          items.push({sev: n.maxsev, title: (a.name || a.description || ''), host: n.name, ip: n.ip, id: n.id, hostid: n.hostid});
        });
      }
    });
    el('l2-alarm-count').textContent = items.length;
    if (!items.length) { el('l2-alarm-list').innerHTML = '<div class="panel-empty">' + t('l2.alarm_empty', 'No active alarms.') + '</div>'; return; }
    items.sort(function (a, b) { return b.sev - a.sev; });
    var h = '';
    items.forEach(function (it) {
      var col = SEV_COLORS[Math.max(0, Math.min(5, it.sev))] || '#999';
      h += '<div class="alarm-row" data-id="' + (it.id || '') + '" data-hostid="' + (it.hostid || '') + '">' +
        '<span class="alarm-dot" style="background:' + col + '"></span>' +
        '<div class="alarm-main"><div class="alarm-title">' + esc(it.title) + '</div>' +
        '<div class="alarm-sub">' + esc(it.host || '') + (it.ip ? ' · ' + esc(it.ip) : '') + '</div></div></div>';
    });
    var box = el('l2-alarm-list');
    box.innerHTML = h;
    box.querySelectorAll('.alarm-row').forEach(function (r) {
      r.addEventListener('click', function () {
        var id = r.getAttribute('data-id');
        if (id) revealById(id);
        else { var hid = r.getAttribute('data-hostid'); if (hid) window.open(META.zabbixHostUrl.replace('__HOSTID__', hid), '_blank'); }
      });
    });
  }

  function buildOffline(snap) {
    var off = (snap.terminals || []).filter(function (tm) { return !tm.online; });
    el('l2-offline-count').textContent = off.length;
    if (!off.length) { el('l2-offline-list').innerHTML = '<div class="panel-empty">' + t('l2.offline_empty', 'No offline terminals.') + '</div>'; return; }
    var h = '';
    off.forEach(function (tm) {
      h += '<div class="off-row" data-mac="' + esc(tm.mac) + '">' +
        '<div class="off-main"><div class="off-mac">' + esc(tm.mac) + '</div>' +
        '<div class="off-sub">' + esc(tm.sw_name || tm.sw_ip) + ' · ' + esc(tm.port || '') + '</div></div></div>';
    });
    var box = el('l2-offline-list');
    box.innerHTML = h;
    box.querySelectorAll('.off-row').forEach(function (r) {
      r.addEventListener('click', function () {
        var mac = r.getAttribute('data-mac');
        revealById('t_' + mac);
      });
    });
  }

  function esc(s) { return String(s == null ? '' : s).replace(/[&<>"']/g, function (c) { return ({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'})[c]; }); }

  /* ---------------- interactions ---------------- */
  function focusNode(id) {
    if (!cy) return;
    var n = cy.getElementById(id);
    if (!n || n.empty() || n.length === 0) return;
    cy.elements().removeClass('hl');
    n.addClass('hl');
    cy.animate({center: {eles: n}, zoom: Math.max(cy.zoom(), 1.1), duration: 380});
    setTimeout(function () { n.removeClass('hl'); }, 2600);
  }

  function groupOfNodeId(id) {
    var hit = (lastSnap && lastSnap.nodes || []).filter(function (n) { return n.id === id; })[0];
    return hit ? groupOf(hit).label : null;
  }

  // Make sure a switch/terminal is visible (auto-opens its workshop from overview).
  function revealById(id) {
    if (!lastSnap) return;
    id = String(id);
    if (id.indexOf('t_') === 0) {
      var tm = (lastSnap.terminals || []).filter(function (x) { return 't_' + x.mac === id; })[0];
      if (!tm) return;
      var g = groupOfNodeId(tm.sw_ip);
      if (g) viewGroup = g;
      var swHit = (lastSnap.nodes || []).filter(function (n) { return n.id === tm.sw_ip; })[0];
      if (swHit) detailNet = networkOf(swHit);
      showTerm = true;
      if (el('l2-showterm')) el('l2-showterm').checked = true;
      render(lastSnap);
      setTimeout(function () { focusNode(id); }, 90);
    } else {
      var g2 = groupOfNodeId(id);
      if (g2 && viewGroup !== g2) { viewGroup = g2; detailNet = null; render(lastSnap); }
      var hit2 = (lastSnap.nodes || []).filter(function (n) { return n.id === id; })[0];
      if (hit2) detailNet = networkOf(hit2);
      render(lastSnap);
      setTimeout(function () { focusNode(id); }, 90);
    }
  }

  function clearPath() {
    if (!cy) return;
    cy.elements().removeClass('dim pathhl');
    lockedPath = null;
  }

  function highlightPath(nodeId) {
    if (!cy) return;
    var chain = [], id = nodeId, guard = 0;
    while (id && guard++ < 40) {
      chain.unshift(id);
      id = pathParent[id] || null;
    }
    cy.elements('node[type="switch"], node[type="ghost"], edge').addClass('dim').removeClass('pathhl');
    var nodes = cy.collection();
    chain.forEach(function (cid) { var n = cy.getElementById(cid); if (n && n.length) nodes = nodes.union(n); });
    nodes.removeClass('dim').addClass('pathhl');
    var edges = cy.edges().filter(function (e) {
      var p = e.data('p'), c = e.data('c');
      if (p && c) return chain.indexOf(p) >= 0 && chain.indexOf(c) >= 0;
      var s = e.data('source'), t = e.data('target');
      return chain.indexOf(s) >= 0 && chain.indexOf(t) >= 0;
    });
    edges.removeClass('dim').addClass('pathhl');
  }

  function bindCy() {
    cy.on('mouseover', 'node[type="switch"]', function (e) {
      if (viewGroup) highlightPath(e.target.id());
      var d = e.target.data();
      var arr = d.alarms || [];
      var sev = (d.maxsev != null && d.maxsev >= 0) ? ('<span style="color:' + SEV_COLORS[d.maxsev] + '">● ' + SEV_NAMES[d.maxsev] + '</span>') : '—';
      var lat = (d.latency_ms != null) ? (d.latency_ms + ' ms') : '—';
      var html = '<b>' + esc(d.name) + '</b><br>' + esc(d.ip) + ' · ' + esc(d.group || '') + '<br>' +
        'Tier: ' + esc(d.tier) + ' · ' + (d.oper || '') + '<br>' +
        'Latency: ' + lat + '<br>' +
        'Terminals: ' + (d.term_online || 0) + ' on / ' + (d.term_offline || 0) + ' off<br>' +
        'Alarm: ' + sev;
      if (arr.length) html += '<hr>' + arr.map(function (a) { return esc(a.name || a.description || ''); }).join('<br>');
      showTip(e, html);
    });
    cy.on('mouseout', 'node[type="switch"]', function () {
      if (!lockedPath) clearPath();
      hideTip();
    });
    cy.on('mouseover', 'node[type="tile"]', function (e) {
      var d = e.target.data();
      var html = '<b>' + esc(d.group) + '</b><br>' + d.n + ' ' + t('l2.unit_sw', 'sw') + '<br>' +
        '↑ Core: ' + (d.up || 0) + ' · ⚠ ' + (d.alarms || 0) + ' · ◌ ' + (d.offline || 0) +
        '<br><span style="opacity:.7">' + t('l2.tile_hint', 'Click to open this workshop') + '</span>';
      showTip(e, html);
    });
    cy.on('mouseout', 'node[type="tile"]', hideTip);
    cy.on('tap', 'node[type="tile"]', function (e) {
      var g = e.target.data('group');
      if (g) { viewGroup = g; detailNet = null; render(lastSnap); }
    });
    cy.on('mouseover', 'edge:not([type="term"])', function (e) {
      var d = e.target.data();
      var sp = (parseFloat(d.speed) || 0) >= 1000 ? ((parseFloat(d.speed) / 1000) + 'G') : (d.speed + 'M');
      showTip(e, 'Link ' + esc(d.a_port || '') + ' ↔ ' + esc(d.b_port || '') + '<br>' + sp + ' · ' + esc(d.state || ''));
    });
    cy.on('mouseout', 'edge', hideTip);
    cy.on('tap', 'node[type="switch"]', function (e) {
      lockedPath = e.target.id();
      highlightPath(lockedPath);
    });
    cy.on('tap', function (e) {
      if (e.target === cy) clearPath();
    });
    cy.on('dbltap', 'node[type="switch"]', function (e) {
      var hid = e.target.data('hostid');
      if (hid) window.open(META.zabbixHostUrl.replace('__HOSTID__', hid), '_blank');
    });
  }

  var SEV_NAMES = ['未分类','信息','警告','一般严重','严重','灾难'];

  function showTip(e, html) {
    var tip = el('l2-tip');
    tip.innerHTML = html;
    tip.style.display = 'block';
    var p = e.renderedPosition || {x: 0, y: 0};
    var box = el('l2-cy').getBoundingClientRect();
    var x = box.left + p.x + 16, y = box.top + p.y + 16;
    tip.style.left = x + 'px'; tip.style.top = y + 'px';
  }
  function hideTip() { el('l2-tip').style.display = 'none'; }

  /* ---------------- search ---------------- */
  function buildIndex(snap) {
    var idx = [];
    (snap.nodes || []).forEach(function (n) { idx.push({id: n.id, label: n.name, sub: n.ip, kind: 'sw'}); });
    (snap.terminals || []).forEach(function (tm) { idx.push({id: 't_' + tm.mac, label: tm.ip || tm.mac, sub: tm.mac + ' · ' + (tm.sw_name || ''), kind: 'term', mac: tm.mac}); });
    return idx;
  }
  var INDEX = [];
  function doSearch(q) {
    var box = el('l2-sug');
    q = (q || '').trim().toLowerCase();
    if (!q) { box.style.display = 'none'; box.innerHTML = ''; return; }
    var hits = [];
    for (var i = 0; i < INDEX.length && hits.length < 14; i++) {
      var it = INDEX[i];
      if ((it.label && it.label.toLowerCase().indexOf(q) >= 0) || (it.sub && it.sub.toLowerCase().indexOf(q) >= 0)) hits.push(it);
    }
    if (!hits.length) { box.innerHTML = '<div class="sug-empty">—</div>'; box.style.display = 'block'; return; }
    box.innerHTML = hits.map(function (h) {
      return '<div class="sug-row" data-id="' + esc(h.id) + '"><span class="sug-kind ' + h.kind + '">' + (h.kind === 'sw' ? 'SW' : 'PC') + '</span>' +
        '<span class="sug-lbl">' + esc(h.label) + '</span><span class="sug-sub">' + esc(h.sub || '') + '</span></div>';
    }).join('');
    box.style.display = 'block';
    box.querySelectorAll('.sug-row').forEach(function (r) {
      r.addEventListener('click', function () {
        var id = r.getAttribute('data-id');
        revealById(id);
        box.style.display = 'none';
      });
    });
  }

  /* ---------------- toolbar wiring ---------------- */
  function setupControls() {
    dark = el('l2-wrap').classList.contains('l2-dark');
    el('l2-dark').checked = dark;
    var back = el('l2-back');
    if (back) {
      back.textContent = t('l2.back_overview', '← Overview');
      back.addEventListener('click', function () { viewGroup = null; detailNet = null; render(lastSnap); });
    }

    el('l2-dark').addEventListener('change', function () {
      dark = el('l2-dark').checked;
      el('l2-wrap').classList.toggle('l2-dark', dark);
      render(lastSnap);
    });
    el('l2-showterm').addEventListener('change', function () { showTerm = el('l2-showterm').checked; render(lastSnap); });
    el('l2-onlyoff').addEventListener('change', function () {
      onlyOff = el('l2-onlyoff').checked;
      if (onlyOff && !showTerm) { showTerm = true; el('l2-showterm').checked = true; }
      render(lastSnap);
    });
    el('l2-zin').addEventListener('click', function () { if (cy) cy.zoom({level: cy.zoom() * 1.25, renderedPosition: {x: cy.width() / 2, y: cy.height() / 2}}); });
    el('l2-zout').addEventListener('click', function () { if (cy) cy.zoom({level: cy.zoom() / 1.25, renderedPosition: {x: cy.width() / 2, y: cy.height() / 2}}); });
    el('l2-fit').addEventListener('click', function () { if (cy) cy.fit(undefined, 50); });
    el('l2-refresh-btn').addEventListener('click', function () { reload(true); });

    var s = el('l2-search');
    s.addEventListener('input', function () { doSearch(s.value); });
    document.addEventListener('click', function (ev) {
      if (!ev.target.closest('.l2-search-wrap')) el('l2-sug').style.display = 'none';
    });

    el('l2-ts').addEventListener('change', function () {
      var v = el('l2-ts').value;
      var u = '/zabbix.php?action=l2.topology.view';
      if (v) u += '&ts=' + encodeURIComponent(v);
      window.location = u;
    });

    el('l2-pause').addEventListener('click', function () {
      paused = !paused;
      el('l2-pause').classList.toggle('on', paused);
      el('l2-pause').textContent = paused ? '▶' : '❚❚';
      el('l2-pause').title = paused ? t('l2.resume', 'Resume') : t('l2.pause', 'Pause');
    });
  }

  function reload(manual) {
    if (!META.isLive) return;
    fetch(META.snapshotUrl + '?t=' + Date.now(), {cache: 'no-store'})
      .then(function (r) { return r.json(); })
      .then(function (j) { if (j && j.nodes) { SNAP = j; INDEX = buildIndex(j); render(j); } })
      .catch(function () {})
      .then(function () { if (manual) resetCountdown(); });
  }

  function resetCountdown() { countdown = META.refreshSeconds || 300; }
  function startTimer() {
    if (!META.isLive) return;
    resetCountdown();
    timer = setInterval(function () {
      if (paused) { el('l2-countdown').textContent = '⏸'; return; }
      countdown--;
      if (countdown <= 0) { countdown = META.refreshSeconds || 300; reload(false); }
      var m = Math.floor(countdown / 60), s = countdown % 60;
      el('l2-countdown').textContent = '↻ ' + m + ':' + (s < 10 ? '0' + s : s);
    }, 1000);
  }

  /* ---------------- boot ---------------- */
  function boot() {
    setupControls();
    try {
      var qs = new URLSearchParams(window.location.search);
      var qg = qs.get('g');
      if (qg) viewGroup = qg;
      var qn = qs.get('net');
      if (qn) detailNet = qn;
    } catch (e) {}
    if (!SNAP || !SNAP.nodes) {
      el('l2-cy').innerHTML = '<div class="l2-empty">' + t('l2.no_data', 'No data') + '</div>';
    } else {
      INDEX = buildIndex(SNAP);
      render(SNAP);
    }
    if (META.isLive) startTimer();
    else { el('l2-pause').disabled = true; el('l2-countdown').textContent = t('l2.snapshot', 'Snapshot'); }
  }

  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', boot);
  else boot();
})();