(function() {
  var C = window.ExplorerCommon;

  function badge(text, variant) {
    return '<span class="addr-badge addr-badge-' + variant + '">' + C.esc(text) + '</span>';
  }

  function renderNode(data) {
    document.title = 'Node ' + C.short(data.address || data.pub_key || '', 16) + ' | DChain Explorer';

    // Profile card
    document.getElementById('nodeNickname').textContent    = data.address ? C.short(data.address, 24) : 'Node';
    document.getElementById('nodeAddressShort').textContent = data.pub_key ? C.short(data.pub_key, 32) : '—';
    document.getElementById('nodeBalanceVal').textContent  = data.node_balance || C.toToken(data.node_balance_ut || 0);
    document.getElementById('nodeReputationRank').textContent = 'Rank: ' + (data.reputation_rank || '—');

    // Badges
    var badges = '';
    if (data.blocks_produced > 0) badges += badge('Validator', 'accent');
    if (data.relay_proofs > 0)    badges += badge('Relay Node', 'relay');
    if (!badges)                  badges  = badge('Observer', 'muted');
    document.getElementById('nodeBadges').innerHTML = badges;

    // Address field
    var addrEl = document.getElementById('nodeAddress');
    addrEl.textContent = data.address || '—';
    addrEl.href = data.pub_key ? '/address?address=' + encodeURIComponent(data.pub_key) : '#';
    document.getElementById('nodeAddressRaw').textContent = data.address || '';

    // PubKey field
    document.getElementById('nodePubKey').textContent = data.pub_key || '—';

    // Wallet binding
    if (data.wallet_binding_address) {
      var link = document.getElementById('bindingLink');
      link.textContent = data.wallet_binding_address;
      link.href = '/address?address=' + encodeURIComponent(data.wallet_binding_pub_key || data.wallet_binding_address);
      document.getElementById('bindingBalance').textContent = data.wallet_binding_balance || '—';
      document.getElementById('bindingRow').style.display = '';
    } else {
      document.getElementById('bindingRow').style.display = 'none';
    }

    // Stats
    document.getElementById('repScore').textContent      = String(data.reputation_score || 0);
    document.getElementById('repRank').textContent       = data.reputation_rank || '—';
    document.getElementById('repBlocks').textContent     = String(data.blocks_produced || 0);
    var rw = data.recent_window_blocks || 0;
    var rp = data.recent_blocks_produced || 0;
    document.getElementById('recentProduced').textContent = 'last ' + rw + ' blocks: ' + rp;
    document.getElementById('repRelay').textContent      = String(data.relay_proofs || 0);
    document.getElementById('repHeartbeats').textContent = String(data.heartbeats || 0);
    var slash = data.slash_count || 0;
    document.getElementById('repSlash').textContent = slash > 0 ? slash + ' slashes' : '';

    // Rewards
    document.getElementById('recentRewards').textContent  = data.recent_rewards || C.toToken(data.recent_rewards_ut || 0);
    document.getElementById('windowBlocks').textContent   = 'window: last ' + rw + ' blocks';
    document.getElementById('lifetimeReward').textContent = data.lifetime_base_reward || C.toToken(0);
    document.getElementById('nodeBalance').textContent    = data.node_balance || C.toToken(data.node_balance_ut || 0);

    document.getElementById('mainContent').style.display = '';
    C.refreshIcons();
  }

  async function loadNode(nodeID) {
    if (!nodeID) return;
    C.setStatus('Loading…', 'warn');
    document.getElementById('mainContent').style.display = 'none';
    try {
      var data = await C.fetchJSON('/api/node/' + encodeURIComponent(nodeID) + '?window=300');
      renderNode(data);
      window.history.replaceState({}, '', '/node?node=' + encodeURIComponent(nodeID));
      C.setStatus('', '');
    } catch (e) {
      C.setStatus('Load failed: ' + e.message, 'err');
    }
  }

  /* ── Copy buttons ────────────────────────────────────────────────────────── */
  document.addEventListener('click', function(e) {
    var t = e.target;
    if (!t) return;
    var btn = t.closest ? t.closest('.copy-btn') : null;
    if (btn) {
      var src = document.getElementById(btn.dataset.copyId);
      if (src) {
        navigator.clipboard.writeText(src.textContent || '').catch(function() {});
        btn.classList.add('copy-btn-done');
        setTimeout(function() { btn.classList.remove('copy-btn-done'); }, 1200);
      }
    }
  });

  /* ── Wiring ────────────────────────────────────────────────────────────── */
  document.getElementById('nodeBtn').addEventListener('click', function() {
    var val = (document.getElementById('nodeInput').value || '').trim();
    if (val) loadNode(val);
  });

  document.getElementById('nodeInput').addEventListener('keydown', function(e) {
    if (e.key === 'Enter') document.getElementById('nodeBtn').click();
  });

  var initial = C.q('node') || C.q('pk');
  if (initial) {
    document.getElementById('nodeInput').value = initial;
    loadNode(initial);
  }
})();