// Adobe Sign → DocuSign Migrator — frontend app
// Vanilla JS, no build step.

const $ = id => document.getElementById(id);

let adobeTemplates = [];   // [{id, name, modifiedDate}]
let dsTemplates = [];      // [{id, name, lastModified}]
let statusTemplates = [];  // [{adobe_id, name, status, docusign_id, ...}]
let authState = { adobe: false, docusign: false };

// ── Init ────────────────────────────────────────────────────────────────────

document.addEventListener('DOMContentLoaded', async () => {
  await refreshAuth();
  await refreshTemplates();
  await refreshHistory();

  $('btn-migrate').addEventListener('click', onMigrate);
  $('btn-refresh').addEventListener('click', async () => {
    await refreshTemplates();
    await refreshHistory();
  });
});

// ── Auth ─────────────────────────────────────────────────────────────────────

async function refreshAuth() {
  const resp = await fetch('/api/auth/status');
  authState = await resp.json();
  renderAuthBar();
}

function renderAuthBar() {
  renderAuthBadge('badge-adobe', 'Adobe Sign', authState.adobe, '/api/auth/adobe/start', '/api/auth/adobe/disconnect');
  renderAuthBadge('badge-docusign', 'DocuSign', authState.docusign, '/api/auth/docusign/start', '/api/auth/docusign/disconnect');
}

function renderAuthBadge(id, label, connected, connectUrl, disconnectUrl) {
  const el = $(id);
  el.textContent = connected ? `✓ ${label}` : `Connect ${label}`;
  el.className = 'auth-badge' + (connected ? ' connected' : '');
  el.onclick = () => {
    if (connected) {
      fetch(disconnectUrl).then(() => { authState[id.replace('badge-','')] = false; renderAuthBar(); refreshTemplates(); });
    } else {
      window.location.href = connectUrl;
    }
  };
}

// ── Templates ────────────────────────────────────────────────────────────────

async function refreshTemplates() {
  renderAdobeList([]);
  renderDsList([]);

  if (!authState.adobe || !authState.docusign) {
    setStatus(authState.adobe || authState.docusign
      ? 'Connect both platforms to see migration status.'
      : 'Connect Adobe Sign and DocuSign to get started.');
    $('btn-migrate').disabled = true;
    return;
  }

  setStatus('Loading templates…');

  try {
    const [statusResp, dsResp] = await Promise.all([
      fetch('/api/templates/status'),
      fetch('/api/templates/docusign'),
    ]);
    statusTemplates = (await statusResp.json()).templates || [];
    dsTemplates = ((await dsResp.json()).templates || []);
    renderAdobeList(statusTemplates);
    renderDsList(dsTemplates);
    setStatus(`${statusTemplates.length} Adobe template(s) loaded.`);
  } catch (e) {
    setStatus('Error loading templates: ' + e.message);
  }
}

function renderAdobeList(items) {
  const ul = $('adobe-list');
  if (!items.length) {
    ul.innerHTML = '<li class="empty-msg">No templates found.</li>';
    return;
  }
  ul.innerHTML = items.map(t => `
    <li class="template-item" data-id="${t.adobe_id}">
      <input type="checkbox" data-id="${t.adobe_id}" />
      <span class="template-name">${escHtml(t.name)}</span>
      <span class="badge badge-${t.status}">${statusLabel(t.status)}</span>
      <span class="template-spinner" id="spin-${t.adobe_id}"></span>
    </li>
  `).join('');

  ul.querySelectorAll('.template-item').forEach(li => {
    li.addEventListener('click', e => {
      if (e.target.type === 'checkbox') return;
      const cb = li.querySelector('input[type=checkbox]');
      cb.checked = !cb.checked;
      li.classList.toggle('selected', cb.checked);
      updateMigrateButton();
    });
    li.querySelector('input').addEventListener('change', () => {
      li.classList.toggle('selected', li.querySelector('input').checked);
      updateMigrateButton();
    });
  });
}

function renderDsList(items) {
  const ul = $('ds-list');
  if (!items.length) {
    ul.innerHTML = '<li class="empty-msg">No templates found.</li>';
    return;
  }
  ul.innerHTML = items.map(t => `
    <li class="template-item">
      <span class="template-name">${escHtml(t.name)}</span>
      <span style="font-size:11px;color:#999">${(t.lastModified || '').slice(0, 10)}</span>
    </li>
  `).join('');
}

function updateMigrateButton() {
  const checked = document.querySelectorAll('#adobe-list input[type=checkbox]:checked');
  $('btn-migrate').disabled = checked.length === 0;
}

// ── Migration ─────────────────────────────────────────────────────────────────

async function onMigrate() {
  const checked = [...document.querySelectorAll('#adobe-list input[type=checkbox]:checked')];
  const ids = checked.map(cb => cb.dataset.id);
  if (!ids.length) return;

  $('btn-migrate').disabled = true;
  setStatus(`Migrating ${ids.length} template(s)…`);

  // Show spinners
  ids.forEach(id => {
    const spin = $('spin-' + id);
    if (spin) spin.textContent = '⏳';
  });

  try {
    const resp = await fetch('/api/migrate', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ adobe_template_ids: ids }),
    });
    const data = await resp.json();

    let successCount = 0;
    (data.results || []).forEach(r => {
      const spin = $('spin-' + r.adobe_template_id);
      if (r.status === 'success') {
        successCount++;
        if (spin) spin.textContent = r.action === 'updated' ? '✏️' : '✅';
      } else {
        if (spin) spin.textContent = '❌';
      }
    });

    setStatus(`Done: ${successCount}/${ids.length} succeeded.`);
    await refreshTemplates();
    await refreshHistory();
  } catch (e) {
    setStatus('Migration error: ' + e.message);
  }
}

// ── History ───────────────────────────────────────────────────────────────────

async function refreshHistory() {
  try {
    const resp = await fetch('/api/migrate/history');
    const { history } = await resp.json();
    renderHistory(history || []);
  } catch {
    renderHistory([]);
  }
}

function renderHistory(records) {
  const tbody = $('history-tbody');
  if (!records.length) {
    tbody.innerHTML = '<tr><td colspan="5" class="empty-msg">No migrations yet.</td></tr>';
    return;
  }
  tbody.innerHTML = [...records].reverse().slice(0, 50).map(r => `
    <tr>
      <td>${(r.timestamp || '').replace('T', ' ').slice(0, 19)}</td>
      <td>${escHtml(r.adobe_template_name || r.adobe_template_id || '')}</td>
      <td>${escHtml(r.docusign_template_id || '—')}</td>
      <td>${escHtml(r.action || '—')}</td>
      <td>
        <span class="badge ${r.status === 'success' ? 'badge-migrated' : 'badge-not_migrated'}">
          ${r.status}
        </span>
      </td>
    </tr>
  `).join('');
}

// ── Utilities ─────────────────────────────────────────────────────────────────

function setStatus(msg) { $('status-msg').textContent = msg; }

function statusLabel(s) {
  return { not_migrated: 'Not Migrated', migrated: 'Migrated', needs_update: 'Needs Update' }[s] || s;
}

function escHtml(str) {
  return String(str)
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;');
}