/* hd-commerce — Wiederverwendbarer Medien-Picker (Admin).
   API: window.HDCMedia.pick({ multiple, onPick(url|urls) }) öffnet ein Modal mit
   Bibliothek (/api/admin/media), Inline-Upload (WebP) und Auswahl. */
(function () {
  var overlay = null, listEl = null, state = { multiple: false, onPick: null, selected: [] };

  function el(tag, cls, html) { var e = document.createElement(tag); if (cls) e.className = cls; if (html != null) e.innerHTML = html; return e; }

  function build() {
    overlay = el('div', 'mp-overlay');
    overlay.innerHTML =
      '<div class="mp-modal" role="dialog" aria-modal="true" aria-label="Medien auswählen">' +
        '<div class="mp-head">' +
          '<strong>Medien-Bibliothek</strong>' +
          '<div class="mp-head-actions">' +
            '<label class="mp-upbtn">+ Hochladen<input type="file" accept="image/*" multiple hidden></label>' +
            '<button type="button" class="mp-close" aria-label="Schließen">✕</button>' +
          '</div>' +
        '</div>' +
        '<div class="mp-drop" data-drop>Bilder hierher ziehen oder „Hochladen" — JPG/PNG werden automatisch zu WebP.</div>' +
        '<div class="mp-msg" data-msg></div>' +
        '<div class="mp-grid" data-grid><div class="mp-empty">Lädt …</div></div>' +
        '<div class="mp-foot">' +
          '<span class="mp-sel" data-sel></span>' +
          '<div style="flex:1"></div>' +
          '<button type="button" class="mp-btn mp-cancel">Abbrechen</button>' +
          '<button type="button" class="mp-btn mp-primary mp-confirm">Auswählen</button>' +
        '</div>' +
      '</div>';
    document.body.appendChild(overlay);
    listEl = overlay.querySelector('[data-grid]');

    overlay.querySelector('.mp-close').addEventListener('click', close);
    overlay.querySelector('.mp-cancel').addEventListener('click', close);
    overlay.addEventListener('click', function (e) { if (e.target === overlay) close(); });
    overlay.querySelector('.mp-confirm').addEventListener('click', confirmSel);

    var fileInput = overlay.querySelector('.mp-upbtn input');
    fileInput.addEventListener('change', function () { upload(fileInput.files); fileInput.value = ''; });

    var drop = overlay.querySelector('[data-drop]');
    ['dragover', 'dragenter'].forEach(function (ev) { drop.addEventListener(ev, function (e) { e.preventDefault(); drop.classList.add('over'); }); });
    ['dragleave', 'drop'].forEach(function (ev) { drop.addEventListener(ev, function (e) { e.preventDefault(); drop.classList.remove('over'); }); });
    drop.addEventListener('drop', function (e) { if (e.dataTransfer && e.dataTransfer.files) upload(e.dataTransfer.files); });

    document.addEventListener('keydown', function (e) { if (overlay && overlay.classList.contains('open') && e.key === 'Escape') close(); });
  }

  function msg(text, kind) {
    var m = overlay.querySelector('[data-msg]');
    m.textContent = text || '';
    m.className = 'mp-msg' + (kind ? ' ' + kind : '') + (text ? ' show' : '');
  }

  function load() {
    listEl.innerHTML = '<div class="mp-empty">Lädt …</div>';
    fetch('/api/admin/media', { headers: { 'Accept': 'application/json' } })
      .then(function (r) { return r.json(); })
      .then(function (d) { renderGrid((d && d.media) || []); })
      .catch(function () { listEl.innerHTML = '<div class="mp-empty">Konnte Medien nicht laden.</div>'; });
  }

  function renderGrid(media) {
    if (!media.length) { listEl.innerHTML = '<div class="mp-empty">Noch keine Medien. Lade oben welche hoch.</div>'; return; }
    listEl.innerHTML = '';
    media.forEach(function (m) {
      var card = el('div', 'mp-card');
      if (state.selected.indexOf(m.url) > -1) card.classList.add('sel');
      card.innerHTML =
        '<div class="mp-thumb"><img src="' + m.url + '" alt="" loading="lazy"></div>' +
        '<div class="mp-meta"><span class="mp-name" title="' + (m.filename || '') + '">' + (m.filename || '') + '</span>' +
        '<span class="mp-size">' + Math.round((m.size || 0) / 1024) + ' KB' + (m.width ? ' · ' + m.width + '×' + m.height : '') + '</span></div>' +
        '<div class="mp-card-acts">' +
          '<button type="button" class="mp-ico" data-copy="' + m.url + '" title="URL kopieren">⧉</button>' +
          '<button type="button" class="mp-ico mp-del" data-del="' + m.id + '" title="Löschen">🗑</button>' +
        '</div>';
      card.querySelector('.mp-thumb').addEventListener('click', function () { toggle(m.url, card); });
      card.querySelector('[data-copy]').addEventListener('click', function (e) {
        e.stopPropagation();
        try { navigator.clipboard.writeText(location.origin + m.url); msg('URL kopiert.', 'ok'); } catch (x) {}
      });
      card.querySelector('[data-del]').addEventListener('click', function (e) {
        e.stopPropagation();
        if (!confirm('Dieses Medium löschen?')) return;
        fetch('/api/admin/media?id=' + m.id, { method: 'DELETE' }).then(function (r) { return r.json(); })
          .then(function (d) { if (d.ok) { state.selected = state.selected.filter(function (u) { return u !== m.url; }); load(); } else msg(d.error || 'Löschen fehlgeschlagen.', 'err'); });
      });
      listEl.appendChild(card);
    });
    updateSelCount();
  }

  function toggle(url, card) {
    if (state.multiple) {
      var i = state.selected.indexOf(url);
      if (i > -1) { state.selected.splice(i, 1); card.classList.remove('sel'); }
      else { state.selected.push(url); card.classList.add('sel'); }
    } else {
      state.selected = [url];
      Array.prototype.forEach.call(listEl.querySelectorAll('.mp-card'), function (c) { c.classList.remove('sel'); });
      card.classList.add('sel');
    }
    updateSelCount();
  }
  function updateSelCount() {
    var s = overlay.querySelector('[data-sel]');
    s.textContent = state.selected.length ? state.selected.length + ' ausgewählt' : '';
  }

  function upload(files) {
    if (!files || !files.length) return;
    var fd = new FormData();
    Array.prototype.forEach.call(files, function (f) { fd.append('files', f); });
    msg('Lädt ' + files.length + ' Datei(en) hoch …');
    fetch('/api/upload', { method: 'POST', body: fd }).then(function (r) { return r.json(); })
      .then(function (d) {
        if (d && d.results) {
          var conv = d.results.filter(function (r) { return r.converted; }).length;
          msg('Hochgeladen' + (conv ? ' (' + conv + '× zu WebP konvertiert)' : '') + '.', 'ok');
          // Neu hochgeladene direkt vorauswählen
          d.results.forEach(function (r) { if (r.ok && r.url && state.selected.indexOf(r.url) < 0) { if (state.multiple) state.selected.push(r.url); else state.selected = [r.url]; } });
          load();
        } else { msg((d && d.error) || 'Upload fehlgeschlagen.', 'err'); }
      })
      .catch(function () { msg('Upload fehlgeschlagen.', 'err'); });
  }

  function confirmSel() {
    if (!state.selected.length) { close(); return; }
    var cb = state.onPick;
    var sel = state.selected.slice();
    close();
    if (cb) cb(state.multiple ? sel : sel[0]);
  }

  function open() { if (!overlay) build(); overlay.classList.add('open'); msg(''); load(); }
  function close() { if (overlay) overlay.classList.remove('open'); }

  window.HDCMedia = {
    pick: function (opts) {
      opts = opts || {};
      state.multiple = !!opts.multiple;
      state.onPick = opts.onPick || null;
      state.selected = [];
      open();
    }
  };
})();