// Carbone Word Template Manager - Frontend
// Use same host as the page, just different port
const CARBONE_API = window.location.protocol + '//' + window.location.hostname + ':8771/api/carbone';

// ============================================================
// NAVIGATION
// ============================================================
// Load carbone templates when the templates page is shown
const carboneNavObserver = new MutationObserver(() => {
  if (document.getElementById('page-templates') && document.getElementById('page-templates').classList.contains('active')) {
    loadCarboneTemplates();
  }
});
document.addEventListener('DOMContentLoaded', () => {
  const templatesPage = document.getElementById('page-templates');
  if (templatesPage) carboneNavObserver.observe(templatesPage, { attributes: true, attributeFilter: ['class'] });
});

// ============================================================
// DOWNLOAD MASTER TEMPLATE
// ============================================================
function downloadMasterTemplate() {
  window.open(CARBONE_API + '/master-template', '_blank');
}

// ============================================================
// UPLOAD CUSTOM TEMPLATE
// ============================================================
const carboneUploadZone = document.getElementById('carbone-upload-zone');
if (carboneUploadZone) {
  carboneUploadZone.addEventListener('dragover', e => { e.preventDefault(); carboneUploadZone.classList.add('dragover'); });
  carboneUploadZone.addEventListener('dragleave', () => carboneUploadZone.classList.remove('dragover'));
  carboneUploadZone.addEventListener('drop', e => {
    e.preventDefault();
    carboneUploadZone.classList.remove('dragover');
    if (e.dataTransfer.files.length) uploadCarboneTemplate(e.dataTransfer.files[0]);
  });
}

async function uploadCarboneTemplate(file) {
  if (!file) return;
  const name = document.getElementById('carbone-template-name').value || file.name.replace(/\.[^.]+$/, '');
  const status = document.getElementById('carbone-upload-status');
  status.innerHTML = '<div class="loading"><span class="spinner"></span> Uploading template...</div>';

  const formData = new FormData();
  formData.append('template', file);
  formData.append('name', name);

  try {
    const resp = await fetch(CARBONE_API + '/templates/upload', { method: 'POST', body: formData });
    const data = await resp.json();
    if (data.success) {
      status.innerHTML = '<div class="toast success" style="position:relative">Template uploaded successfully!</div>';
      toast('Template uploaded: ' + name);
      document.getElementById('carbone-template-name').value = '';
      loadCarboneTemplates();
    } else {
      status.innerHTML = '<div class="toast error" style="position:relative">Upload failed: ' + (data.error || 'Unknown error') + '</div>';
    }
  } catch (e) {
    status.innerHTML = '<div class="toast error" style="position:relative">Upload failed: ' + e.message + '</div>';
  }
}

// ============================================================
// LIST TEMPLATES
// ============================================================
async function loadCarboneTemplates() {
  const list = document.getElementById('carbone-templates-list');
  if (!list) return;
  list.innerHTML = '<div class="loading">Loading...</div>';

  try {
    const resp = await fetch(CARBONE_API + '/templates');
    const data = await resp.json();
    if (!data.templates || !data.templates.length) {
      list.innerHTML = '<p class="text-muted">No custom templates uploaded yet. Download the master template, customize it in Word, and upload it here.</p>';
      return;
    }
    list.innerHTML = data.templates.map(t => `
      <div class="skill-row">
        <div>
          <strong>${t.name}</strong>
          <div class="text-muted text-sm">Uploaded: ${new Date(t.uploadedAt).toLocaleDateString()} · ${t.originalName}</div>
        </div>
        <div class="flex gap-8">
          <button class="btn btn-sm btn-outline" onclick="renderSampleCV('${t.id}')">Generate Sample CV</button>
          <button class="btn btn-sm btn-danger" onclick="deleteCarboneTemplate('${t.id}')">Delete</button>
        </div>
      </div>
    `).join('');
  } catch (e) {
    list.innerHTML = '<p class="text-muted">Error loading templates: ' + e.message + '</p>';
  }
}

// ============================================================
// RENDER SAMPLE CV
// ============================================================
async function renderSampleCV(templateId) {
  toast('Generating sample CV PDF...');

  // Get first candidate for sample data
  try {
    const candidatesResp = await fetch('/api/candidates?limit=1');
    const candidatesData = await candidatesResp.json();
    let cvData = null;

    if (candidatesData.candidates && candidatesData.candidates.length > 0) {
      const fullResp = await fetch('/api/candidates/' + candidatesData.candidates[0].id);
      cvData = await fullResp.json();
    }

    if (!cvData) {
      toast('Upload a CV first to generate a sample', 'error');
      return;
    }

    const resp = await fetch(CARBONE_API + '/templates/' + templateId + '/render', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ candidateData: cvData })
    });

    if (!resp.ok) {
      const err = await resp.json();
      throw new Error(err.error || 'Render failed');
    }

    const blob = await resp.blob();
    const url = URL.createObjectURL(blob);
    window.open(url, '_blank');
    toast('Sample CV generated');
  } catch (e) {
    toast('Render failed: ' + e.message, 'error');
  }
}

// ============================================================
// DELETE TEMPLATE
// ============================================================
async function deleteCarboneTemplate(templateId) {
  if (!confirm('Delete this template?')) return;
  try {
    await fetch(CARBONE_API + '/templates/' + templateId, { method: 'DELETE' });
    toast('Template deleted');
    loadCarboneTemplates();
  } catch (e) {
    toast('Delete failed: ' + e.message, 'error');
  }
}

// ============================================================
// TAGS HELP - View in app
// ============================================================
async function viewTagsHelp() {
  try {
    const resp = await fetch(CARBONE_API + '/help');
    const data = await resp.json();
    
    let html = '<div style="max-height:600px;overflow-y:auto">';
    for (const section of data.sections) {
      html += `<h3 style="margin-top:20px;color:var(--accent)">${section.title}</h3>`;
      if (section.note) html += `<p class="text-muted text-sm" style="margin-bottom:8px">${section.note}</p>`;
      html += '<table><thead><tr><th>Tag</th><th>Description</th></tr></thead><tbody>';
      for (const t of section.tags) {
        html += `<tr><td style="font-family:monospace;color:var(--accent);white-space:nowrap">${escapeHtml(t.tag)}</td><td>${escapeHtml(t.desc)}</td></tr>`;
      }
      html += '</tbody></table>';
    }
    html += '</div>';
    html += '<div class="mt-16"><button class="btn btn-outline" onclick="downloadHelpDocx()">Download as .docx</button></div>';
    
    showModal(html, 'Carbone Tags Reference');
  } catch (e) {
    toast('Failed to load help: ' + e.message, 'error');
  }
}

// ============================================================
// TAGS HELP - Download .docx
// ============================================================
function downloadHelpDocx() {
  window.open(CARBONE_API + '/help-docx', '_blank');
}