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

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

let statusTemplates = [];  // [{adobe_id, name, status, docusign_id, ...}]
let dsTemplates = [];      // [{id, name, lastModified}]
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() {
  // Adobe: use .env credentials (primary), OAuth dialog (secondary)
  const adobeEl = $('badge-adobe');
  adobeEl.textContent = authState.adobe ? '✓ Adobe Sign' : 'Connect Adobe Sign';
  adobeEl.className = 'auth-badge' + (authState.adobe ? ' connected' : '');
  adobeEl.onclick = authState.adobe
    ? () => disconnectPlatform('adobe')
    : () => connectAdobeEnv();

  // DocuSign: JWT grant from .env — no browser sign-in needed
  const dsEl = $('badge-docusign');
  dsEl.textContent = authState.docusign ? '✓ DocuSign' : 'Connect DocuSign';
  dsEl.className = 'auth-badge' + (authState.docusign ? ' connected' : '');
  dsEl.onclick = authState.docusign
    ? () => disconnectPlatform('docusign')
    : () => connectDocusign();
}

async function disconnectPlatform(platform) {
  await fetch(`/api/auth/${platform}/disconnect`);
  authState[platform] = false;
  renderAuthBar();
  await refreshTemplates();
}

async function connectAdobeEnv() {
  const el = $('badge-adobe');
  el.textContent = 'Connecting…';
  const resp = await fetch('/api/auth/adobe/connect');
  const data = await resp.json();
  if (data.connected) {
    authState.adobe = true;
    renderAuthBar();
    await refreshTemplates();
  } else {
    el.textContent = 'Connect Adobe Sign';
    // If .env has no credentials, fall back to the OAuth dialog
    if (data.error && data.error.includes('No Adobe Sign credentials')) {
      startAdobeAuth();
    } else {
      setStatus('Adobe Sign error: ' + (data.error || 'unknown'));
    }
  }
}

async function connectDocusign() {
  const dsEl = $('badge-docusign');
  dsEl.textContent = 'Connecting…';
  const resp = await fetch('/api/auth/docusign/connect');
  const data = await resp.json();
  if (data.connected) {
    authState.docusign = true;
    renderAuthBar();
    await refreshTemplates();
  } else {
    dsEl.textContent = 'Connect DocuSign';
    setStatus('DocuSign error: ' + (data.error || 'unknown'));
  }
}

// Adobe Sign uses the same manual-paste flow as the CLI:
// 1. Open auth URL in new tab
// 2. User authorizes → lands on failed https://localhost:8080/callback page
// 3. User copies that URL, pastes it into the dialog here
// 4. We POST it to /api/auth/adobe/exchange

async function startAdobeAuth() {
  const resp = await fetch('/api/auth/adobe/url');
  const { url } = await resp.json();

  showAdobeDialog(url);
}

function showAdobeDialog(authUrl) {
  // Remove any existing dialog
  const existing = $('adobe-auth-dialog');
  if (existing) existing.remove();

  const dialog = document.createElement('div');
  dialog.id = 'adobe-auth-dialog';
  dialog.innerHTML = `
    <div class="dialog-backdrop"></div>
    <div class="dialog-box">
      <h2>Connect Adobe Sign</h2>
      <ol>
        <li><a href="${escHtml(authUrl)}" target="_blank" rel="noopener" id="adobe-auth-link">Click here to authorize in Adobe Sign</a></li>
        <li>After authorizing, your browser will show a page that fails to load — that's expected.</li>
        <li>Copy the full URL from the address bar and paste it below.</li>
      </ol>
      <input type="text" id="adobe-redirect-input" placeholder="https://localhost:8080/callback?code=…" />
      <div class="dialog-error" id="dialog-error"></div>
      <div class="dialog-actions">
        <button id="btn-submit-code">Connect</button>
        <button id="btn-cancel-dialog" class="btn-secondary">Cancel</button>
      </div>
    </div>
  `;
  document.body.appendChild(dialog);

  $('btn-cancel-dialog').onclick = () => dialog.remove();
  $('btn-submit-code').onclick = () => submitAdobeCode(dialog);

  // Also handle Enter key
  $('adobe-redirect-input').addEventListener('keydown', e => {
    if (e.key === 'Enter') submitAdobeCode(dialog);
  });
}

async function submitAdobeCode(dialog) {
  const url = $('adobe-redirect-input').value.trim();
  if (!url) return;

  $('btn-submit-code').disabled = true;
  $('btn-submit-code').textContent = 'Connecting…';
  $('dialog-error').textContent = '';

  try {
    const resp = await fetch('/api/auth/adobe/exchange', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ redirect_url: url }),
    });
    const data = await resp.json();

    if (!resp.ok || data.error) {
      $('dialog-error').textContent = data.error || 'Connection failed.';
      $('btn-submit-code').disabled = false;
      $('btn-submit-code').textContent = 'Connect';
      return;
    }

    dialog.remove();
    authState.adobe = true;
    renderAuthBar();
    await refreshTemplates();
  } catch (e) {
    $('dialog-error').textContent = 'Error: ' + e.message;
    $('btn-submit-code').disabled = false;
    $('btn-submit-code').textContent = 'Connect';
  }
}

// ── 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)…`);

  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;');
}