/* ═══════════════════════════════════════════════════════════════════════
 * Fajl: static/js/export_dropdown.js | v1.0.0 | 05.05.2026
 * Autor: Damir Radulić <dradulic@outlook.com> / damir@rinet.one
 * Lokacija: /opt/pgz-sport/static/js/export_dropdown.js
 * Svrha: Shared "Export ▾" dropdown — CSV / XLSX / PDF — za sve tablice u
 *        sport2.html, app.html, crm_v2.html, erp_full.html. Iza scene
 *        koristi /api/v2/export?format=...&endpoint=... s autoriziranim
 *        Bearer tokenom iz localStorage / sessionStorage.
 * Public API:
 *   window.attachExportDropdown(buttonEl, endpointFn, filenameBase)
 *     - buttonEl:    <button> element trigger
 *     - endpointFn:  function returning the current endpoint+querystring
 *                    each time it's called (so filters stay live)
 *     - filenameBase: short name for downloaded file (e.g. 'klubovi')
 * ═══════════════════════════════════════════════════════════════════════ */
(function () {
  'use strict';

  if (window.attachExportDropdown) return; // idempotent

  // ── inject minimal Palantir-ish CSS once ──────────────────────────────
  var STYLE_ID = 'pgz-export-dropdown-style';
  if (!document.getElementById(STYLE_ID)) {
    var st = document.createElement('style');
    st.id = STYLE_ID;
    st.textContent = [
      '.export-btn{background:var(--bg3,#1a1d24);border:1px solid var(--rim,#2a2e38);',
      '  color:var(--t1,#e0e3e9);padding:6px 11px;border-radius:5px;font-size:11px;',
      '  cursor:pointer;font-family:inherit;letter-spacing:.3px}',
      '.export-btn:hover{border-color:var(--pgz-gold,#d4a849);color:var(--pgz-gold,#d4a849)}',
      '.pgz-exp-wrap{position:relative;display:inline-block}',
      '.pgz-exp-menu{position:absolute;right:0;top:calc(100% + 4px);min-width:130px;',
      '  background:var(--bg2,#15181f);border:1px solid var(--rim,#2a2e38);border-radius:6px;',
      '  box-shadow:0 6px 20px rgba(0,0,0,.45);padding:4px;z-index:9999;display:none;',
      '  font-family:ui-monospace,Menlo,Consolas,monospace}',
      '.pgz-exp-menu.on{display:block}',
      '.pgz-exp-menu button{display:block;width:100%;text-align:left;background:transparent;',
      '  border:0;color:var(--t1,#e0e3e9);padding:7px 11px;font-size:11px;cursor:pointer;',
      '  border-radius:4px;font-family:inherit;letter-spacing:.4px}',
      '.pgz-exp-menu button:hover{background:var(--bg3,#1a1d24);color:var(--pgz-gold,#d4a849)}',
      '.pgz-exp-menu .sep{border-top:1px solid var(--rim,#2a2e38);margin:3px 0}'
    ].join('\n');
    document.head.appendChild(st);
  }

  // Close menus on outside click.
  document.addEventListener('click', function (ev) {
    var menus = document.querySelectorAll('.pgz-exp-menu.on');
    menus.forEach(function (m) {
      if (!m.contains(ev.target) && !(m.__trigger && m.__trigger.contains(ev.target))) {
        m.classList.remove('on');
      }
    });
  });

  function _token() {
    return (
      localStorage.getItem('pgz_access') ||
      sessionStorage.getItem('pgz_access') ||
      localStorage.getItem('access_token') ||
      sessionStorage.getItem('access_token') ||
      ''
    );
  }

  function _resolveEndpoint(endpointFn) {
    try {
      var ep = (typeof endpointFn === 'function') ? endpointFn() : String(endpointFn || '');
      if (!ep) return null;
      // Normalize: must start with / so the server proxies to localhost.
      if (!/^https?:\/\//i.test(ep) && !ep.startsWith('/')) ep = '/' + ep;
      return ep;
    } catch (e) {
      console.error('[export] endpointFn threw', e);
      return null;
    }
  }

  function _trigger(format, endpointFn, filenameBase) {
    var ep = _resolveEndpoint(endpointFn);
    if (!ep) {
      alert('Export: endpoint nije dostupan.');
      return;
    }
    var url = '/api/v2/export?format=' + encodeURIComponent(format) +
              '&endpoint=' + encodeURIComponent(ep) +
              '&filename=' + encodeURIComponent(filenameBase || 'export');

    var tok = _token();
    if (format === 'pdf') {
      // PDF mock = HTML page. Open in a new tab; the page has a Print button.
      // If we have a token, push it as a hash so the user stays logged in
      // when they re-fetch (server still validates from the original GET).
      var w = window.open('', '_blank');
      if (!w) { alert('Pop-up blocked — dopusti pop-up za export.'); return; }
      // Use fetch with auth, then write to the new window.
      fetch(url, { headers: tok ? { 'Authorization': 'Bearer ' + tok } : {} })
        .then(function (r) { if (!r.ok) throw new Error('HTTP ' + r.status); return r.text(); })
        .then(function (html) { w.document.open(); w.document.write(html); w.document.close(); })
        .catch(function (e) {
          w.document.body.innerText = 'Export greška: ' + e.message;
        });
      return;
    }

    // csv / xlsx — fetch as blob, force download via hidden <a>.
    fetch(url, { headers: tok ? { 'Authorization': 'Bearer ' + tok } : {} })
      .then(function (r) {
        if (!r.ok) throw new Error('HTTP ' + r.status);
        var dispo = r.headers.get('Content-Disposition') || '';
        var m = dispo.match(/filename="?([^"]+)"?/);
        var fname = m ? m[1] : (filenameBase || 'export') + '.' + format;
        return r.blob().then(function (b) { return { blob: b, fname: fname }; });
      })
      .then(function (o) {
        var burl = URL.createObjectURL(o.blob);
        var a = document.createElement('a');
        a.href = burl;
        a.download = o.fname;
        document.body.appendChild(a);
        a.click();
        setTimeout(function () {
          document.body.removeChild(a);
          URL.revokeObjectURL(burl);
        }, 200);
      })
      .catch(function (e) {
        alert('Export greška: ' + e.message);
        console.error('[export]', e);
      });
  }

  function attachExportDropdown(btn, endpointFn, filenameBase) {
    if (!btn) return;
    if (btn.__pgzExpAttached) return;
    btn.__pgzExpAttached = true;

    // Wrap in a positioned container so the menu floats correctly.
    var wrap;
    if (btn.parentElement && btn.parentElement.classList.contains('pgz-exp-wrap')) {
      wrap = btn.parentElement;
    } else {
      wrap = document.createElement('span');
      wrap.className = 'pgz-exp-wrap';
      btn.parentNode.insertBefore(wrap, btn);
      wrap.appendChild(btn);
    }
    if (!btn.classList.contains('export-btn')) btn.classList.add('export-btn');
    if (!/▾|▼/.test(btn.textContent)) btn.textContent = (btn.textContent || 'Export') + ' ▾';

    var menu = document.createElement('div');
    menu.className = 'pgz-exp-menu';
    menu.innerHTML = [
      '<button data-fmt="csv">CSV (HR Excel)</button>',
      '<button data-fmt="xlsx">XLSX</button>',
      '<div class="sep"></div>',
      '<button data-fmt="pdf">PDF (print)</button>'
    ].join('');
    wrap.appendChild(menu);
    menu.__trigger = btn;

    btn.addEventListener('click', function (ev) {
      ev.stopPropagation();
      // Close other open menus first.
      document.querySelectorAll('.pgz-exp-menu.on').forEach(function (m) {
        if (m !== menu) m.classList.remove('on');
      });
      menu.classList.toggle('on');
    });

    menu.addEventListener('click', function (ev) {
      var t = ev.target.closest('button[data-fmt]');
      if (!t) return;
      ev.stopPropagation();
      menu.classList.remove('on');
      _trigger(t.getAttribute('data-fmt'), endpointFn, filenameBase);
    });
  }

  window.attachExportDropdown = attachExportDropdown;
})();