// ── File Handling ──

let pendingFiles = []; // [{ name, type, base64 }]
let pendingRefs = [];  // [{ path, from, to }] - Workspace-Dateireferenzen

function handleFileSelect(file) {
  if (!file) return;

  const maxSize = 20 * 1024 * 1024; // 20MB
  if (file.size > maxSize) {
    alert('Datei zu groß (max. 20MB)');
    return;
  }

  const allowed = ['image/jpeg', 'image/png', 'image/gif', 'image/webp', 'application/pdf'];
  if (!allowed.includes(file.type)) {
    alert('Nicht unterstützter Dateityp. Erlaubt: JPEG, PNG, GIF, WebP, PDF');
    return;
  }

  const reader = new FileReader();
  reader.onload = () => {
    const base64 = reader.result.split(',')[1];
    pendingFiles.push({ name: file.name, type: file.type, base64 });
    renderFilePreview();
  };
  reader.readAsDataURL(file);
}

function handleMultipleFiles(files) {
  for (const file of files) handleFileSelect(file);
}

function renderFilePreview() {
  const preview = $('#filePreview');
  if (!preview || pendingFiles.length === 0) {
    if (preview) { preview.innerHTML = ''; preview.hidden = true; }
    return;
  }

  preview.innerHTML = pendingFiles.map((f, i) => {
    const isImage = f.type.startsWith('image/');
    return `<div class="file-preview-inner">
      ${isImage ? '<img src="data:' + f.type + ';base64,' + f.base64 + '" class="file-thumb">' : '<span class="file-icon"><i class="fa fa-file-text-o"></i></span>'}
      <span class="file-name">${esc(f.name)}</span>
      <button class="file-remove" onclick="removePendingFile(${i})"><i class="fa fa-times"></i></button>
    </div>`;
  }).join('');
  preview.hidden = false;
}

function removePendingFile(index) {
  pendingFiles.splice(index, 1);
  renderFilePreview();
}

function clearPendingFiles() {
  pendingFiles.length = 0;
  const preview = $('#filePreview');
  if (preview) { preview.innerHTML = ''; preview.hidden = true; }
  const fileInput = $('#fileInput');
  if (fileInput) fileInput.value = '';
}

// ── Workspace Refs ──

function addPendingRef(ref) {
  // ref = "path", "path:line" oder "path:from-to"
  const rangeMatch = ref.match(/^(.+?):(\d+)-(\d+)$/);
  const lineMatch = !rangeMatch && ref.match(/^(.+?):(\d+)$/);
  if (rangeMatch) {
    pendingRefs.push({ path: rangeMatch[1], from: parseInt(rangeMatch[2]), to: parseInt(rangeMatch[3]) });
  } else if (lineMatch) {
    pendingRefs.push({ path: lineMatch[1], from: parseInt(lineMatch[2]), to: parseInt(lineMatch[2]) });
  } else {
    pendingRefs.push({ path: ref, from: null, to: null });
  }
  renderRefPreview();
}

function removePendingRef(index) {
  pendingRefs.splice(index, 1);
  renderRefPreview();
}

function clearPendingRefs() {
  pendingRefs.length = 0;
  renderRefPreview();
}

function renderRefPreview() {
  const container = $('#refPreview');
  if (!container) return;

  if (pendingRefs.length === 0) {
    container.innerHTML = '';
    container.hidden = true;
    return;
  }

  container.innerHTML = pendingRefs.map((r, i) => {
    const label = r.from && r.to && r.from !== r.to ? `${r.path}:${r.from}-${r.to}` : r.from ? `${r.path}:${r.from}` : r.path;
    return `<div class="ref-preview-item">
      <span class="ref-icon"><i class="fa fa-folder-open"></i></span>
      <span class="ref-label">${esc(label)}</span>
      <button class="file-remove" onclick="removePendingRef(${i})"><i class="fa fa-times"></i></button>
    </div>`;
  }).join('');
  container.hidden = false;
}