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

  var params  = new URLSearchParams(window.location.search);
  var tokenID = params.get('id');
  var nftID   = params.get('nft');

  function kv(icon, label, valHtml) {
    return '<div class="addr-kv-row">' +
      '<div class="addr-kv-key"><i data-lucide="' + icon + '"></i> ' + label + '</div>' +
      '<div class="addr-kv-val">' + valHtml + '</div>' +
    '</div>';
  }

  function copyBtn(id) {
    return '<button class="copy-btn" data-copy-id="' + id + '" title="Copy"><i data-lucide="copy"></i></button>';
  }

  function hiddenSpan(id, val) {
    return '<span id="' + id + '" style="display:none">' + C.esc(val) + '</span>';
  }

  /* ── Fungible token ──────────────────────────────────────────────────────── */

  async function loadToken() {
    C.setStatus('Loading token…', 'warn');
    try {
      var data = await C.fetchJSON('/api/tokens/' + tokenID);
      if (!data || !data.token_id) { C.setStatus('Token not found.', 'err'); return; }

      document.title = data.symbol + ' | DChain Explorer';
      document.getElementById('bannerType').textContent = 'Fungible Token';
      document.getElementById('bannerName').textContent = data.name + '  (' + data.symbol + ')';
      document.getElementById('bannerBlock').textContent = 'block ' + (data.issued_at || 0);
      document.getElementById('bannerIcon').querySelector('i').setAttribute('data-lucide', 'coins');

      var d = data.decimals || 0;
      var supplyFmt = formatSupply(data.total_supply || 0, d);

      var rows = '';
      rows += kv('hash', 'Token ID',
        '<span class="mono addr-pubkey-text" id="tid">' + C.esc(data.token_id) + '</span>' + copyBtn('tid'));
      rows += kv('type', 'Symbol',
        '<span class="token-sym">' + C.esc(data.symbol) + '</span>');
      rows += kv('tag', 'Name', C.esc(data.name));
      rows += kv('layers-3', 'Decimals', '<span class="mono">' + d + '</span>');
      rows += kv('bar-chart-2', 'Total Supply',
        '<span class="mono">' + C.esc(supplyFmt) + '</span>');
      rows += kv('user', 'Issuer',
        '<a href="/address?address=' + encodeURIComponent(data.issuer) + '" class="mono">' +
          C.short(data.issuer, 20) +
        '</a>' +
        hiddenSpan('issuerRaw', data.issuer) + copyBtn('issuerRaw'));
      rows += kv('blocks', 'Issued at block',
        '<span class="mono">' + (data.issued_at || 0) + '</span>');

      document.getElementById('kvList').innerHTML = rows;
      document.getElementById('rawJSON').textContent = JSON.stringify(data, null, 2);
      document.getElementById('tabRaw').style.display = '';

      document.getElementById('mainContent').style.display = '';
      C.setStatus('', '');
      C.refreshIcons();
      C.wireClipboard();
    } catch(e) {
      C.setStatus('Load failed: ' + e.message, 'err');
    }
  }

  /* ── NFT ─────────────────────────────────────────────────────────────────── */

  async function loadNFT() {
    C.setStatus('Loading NFT…', 'warn');
    try {
      var data = await C.fetchJSON('/api/nfts/' + nftID);
      var n = data && data.nft ? data.nft : data;
      if (!n || !n.nft_id) { C.setStatus('NFT not found.', 'err'); return; }

      document.title = n.name + ' | DChain Explorer';
      document.getElementById('bannerType').textContent = n.burned ? 'NFT (Burned)' : 'NFT';
      document.getElementById('bannerName').textContent = n.name;
      document.getElementById('bannerBlock').textContent = 'minted block ' + (n.minted_at || 0);
      document.getElementById('bannerIcon').querySelector('i').setAttribute('data-lucide', 'image');
      if (n.burned) document.getElementById('banner').classList.add('tx-banner-err');

      // Show image if URI looks like an image
      if (n.uri && /\.(png|jpg|jpeg|gif|svg|webp)/i.test(n.uri)) {
        document.getElementById('nftImage').src = n.uri;
        document.getElementById('nftImageWrap').style.display = '';
      }

      var ownerAddr = data.owner_address || '';
      var rows = '';
      rows += kv('hash', 'NFT ID',
        '<span class="mono addr-pubkey-text" id="nid">' + C.esc(n.nft_id) + '</span>' + copyBtn('nid'));
      rows += kv('tag', 'Name', C.esc(n.name));
      if (n.description)
        rows += kv('file-text', 'Description', C.esc(n.description));
      if (n.uri)
        rows += kv('link', 'Metadata URI',
          '<a href="' + C.esc(n.uri) + '" target="_blank" class="mono" style="word-break:break-all">' + C.esc(n.uri) + '</a>');
      if (!n.burned && n.owner) {
        rows += kv('user', 'Owner',
          '<a href="/address?address=' + encodeURIComponent(n.owner) + '" class="mono">' +
            C.short(ownerAddr || n.owner, 20) +
          '</a>' +
          hiddenSpan('ownerRaw', n.owner) + copyBtn('ownerRaw'));
      } else if (n.burned) {
        rows += kv('flame', 'Status', '<span style="color:var(--err)">Burned</span>');
      }
      rows += kv('user-check', 'Issuer',
        '<a href="/address?address=' + encodeURIComponent(n.issuer) + '" class="mono">' +
          C.short(n.issuer, 20) +
        '</a>');
      rows += kv('blocks', 'Minted at block',
        '<span class="mono">' + (n.minted_at || 0) + '</span>');

      document.getElementById('kvList').innerHTML = rows;

      // Attributes
      if (n.attributes) {
        try {
          var attrs = JSON.parse(n.attributes);
          var keys = Object.keys(attrs);
          if (keys.length) {
            var html = '';
            keys.forEach(function(k) {
              html += '<div class="attr-chip"><div class="attr-chip-key">' + C.esc(k) + '</div>' +
                '<div class="attr-chip-val">' + C.esc(String(attrs[k])) + '</div></div>';
            });
            document.getElementById('attrsGrid').innerHTML = html;
            document.getElementById('attrsSection').style.display = '';
          }
        } catch(_) {}
      }

      document.getElementById('rawJSON').textContent = JSON.stringify(data, null, 2);
      document.getElementById('tabRaw').style.display = '';
      document.getElementById('mainContent').style.display = '';
      C.setStatus('', '');
      C.refreshIcons();
      C.wireClipboard();
    } catch(e) {
      C.setStatus('Load failed: ' + e.message, 'err');
    }
  }

  /* ── Helpers ─────────────────────────────────────────────────────────────── */

  function formatSupply(supply, decimals) {
    if (decimals === 0) return supply.toLocaleString();
    var d = Math.pow(10, decimals);
    var whole = Math.floor(supply / d);
    var frac  = supply % d;
    if (frac === 0) return whole.toLocaleString();
    return whole.toLocaleString() + '.' + String(frac).padStart(decimals, '0').replace(/0+$/, '');
  }

  /* ── Tabs ────────────────────────────────────────────────────────────────── */

  document.getElementById('tabOverview').addEventListener('click', function() {
    document.getElementById('paneOverview').style.display = '';
    document.getElementById('paneRaw').style.display = 'none';
    document.getElementById('tabOverview').classList.add('tx-tab-active');
    document.getElementById('tabRaw').classList.remove('tx-tab-active');
  });
  document.getElementById('tabRaw').addEventListener('click', function() {
    document.getElementById('paneOverview').style.display = 'none';
    document.getElementById('paneRaw').style.display = '';
    document.getElementById('tabRaw').classList.add('tx-tab-active');
    document.getElementById('tabOverview').classList.remove('tx-tab-active');
  });

  /* ── Boot ────────────────────────────────────────────────────────────────── */

  if (nftID)   loadNFT();
  else if (tokenID) loadToken();
  else C.setStatus('No token or NFT ID provided.', 'err');

})();