/**
 * corpus-save.js — "Save to corpus" shared handler for all DBN tool pages.
 *
 * Buttons that trigger a save must have:
 *   class="js-save-corpus"
 *   data-content-id="<id of element containing the text to save>"
 *   data-tool="<source_tool slug, e.g. korrespond>"
 *   data-suggested-title="<pre-filled title string>"  (optional)
 */

(function () {
  'use strict';

  const dlg      = document.getElementById('save-corpus-dialog');
  const form     = document.getElementById('save-corpus-form');
  const titleIn  = document.getElementById('save-corpus-title');
  const tagsIn   = document.getElementById('save-corpus-tags');
  const cancelBtn = document.getElementById('save-corpus-cancel');

  if (!dlg || !form) return; // dialog not present (e.g. not logged in)

  cancelBtn?.addEventListener('click', () => dlg.close());

  let _pendingBtn  = null;
  let _pendingContent = '';
  let _pendingTool = '';

  // Delegated click — catches buttons added dynamically by tool JS
  document.addEventListener('click', (e) => {
    const btn = e.target.closest('.js-save-corpus');
    if (!btn) return;

    const contentId = btn.dataset.contentId;
    const el = contentId ? document.getElementById(contentId) : null;
    const content = (el ? (el.value ?? el.textContent) : '').trim();

    if (!content || content.length < 30) {
      btn.textContent = 'Nothing to save';
      setTimeout(() => { btn.textContent = 'Save to corpus'; }, 2000);
      return;
    }

    _pendingBtn     = btn;
    _pendingContent = content;
    _pendingTool    = btn.dataset.tool ?? '';

    titleIn.value = btn.dataset.suggestedTitle ?? '';
    tagsIn.value  = '';
    dlg.showModal();
    titleIn.focus();
    titleIn.select();
  });

  // Form submit inside dialog
  form.addEventListener('submit', async (e) => {
    e.preventDefault();
    dlg.close();

    const btn     = _pendingBtn;
    const content = _pendingContent;
    const title   = titleIn.value.trim();
    const tags    = tagsIn.value.trim();
    const tool    = _pendingTool;

    if (!title || !content) return;

    if (btn) {
      btn.disabled    = true;
      btn.textContent = 'Saving…';
    }

    try {
      const resp = await fetch('api/save-to-corpus.php', {
        method:  'POST',
        headers: { 'Content-Type': 'application/json' },
        body:    JSON.stringify({ title, content, source_tool: tool, tags }),
      });

      const data = await resp.json().catch(() => ({}));

      if (resp.ok && data.ok) {
        if (btn) {
          btn.textContent = '✓ Saved to corpus';
          btn.classList.add('js-save-corpus--saved');
        }
      } else {
        const msg = data.error ?? `Error ${resp.status}`;
        if (btn) {
          btn.textContent = 'Save failed';
          btn.disabled    = false;
          btn.title       = msg;
        }
        console.error('[corpus-save] Save failed:', msg);
      }
    } catch (err) {
      if (btn) {
        btn.textContent = 'Network error';
        btn.disabled    = false;
      }
      console.error('[corpus-save] Network error:', err);
    }

    _pendingBtn     = null;
    _pendingContent = '';
  });
}());