/**
 * IHF Annotation Launcher — ihf-annotation-launcher.js
 *
 * A self-contained vanilla JS module (no framework dependency) that injects
 * an "Annotate" trigger adjacent to every element carrying a `data-widget-id`
 * attribute. Works in IHP server-rendered pages and in React/Vue pages where
 * IHP does not own the DOM.
 *
 * Activation: include this script in the page layout (or load it dynamically).
 * It is gated by the IHP_ANNOTATION_LAUNCHER environment variable on the server,
 * which controls whether the <script> tag is emitted at all.
 *
 * Data attributes read:
 *   data-widget-id   — UUID of the widget (required)
 *   data-hub-id      — UUID of the owning hub (read from element or nearest ancestor)
 *
 * The annotation form POSTs to /annotations (IHP's existing AnnotationsController).
 *
 * Usage (static HTML test):
 *   <div data-widget-id="<uuid>" data-hub-id="<uuid>" data-view-context="main">
 *     <button>My Widget</button>
 *   </div>
 *   <script src="/js/ihf-annotation-launcher.js"></script>
 */

(function () {
  'use strict';

  var LAUNCHER_CLASS = 'ihf-launcher-injected';
  var TRIGGER_CLASS  = 'ihf-annotate-trigger';
  var FORM_CLASS     = 'ihf-annotate-form';

  var CATEGORY_OPTIONS = [
    { value: 'friction',     label: 'Friction' },
    { value: 'suggestion',   label: 'Suggestion' },
    { value: 'confusing',    label: 'Confusing' },
    { value: 'praise',       label: 'Praise' },
    { value: 'bug',          label: 'Bug' },
    { value: 'other',        label: 'Other' },
  ];

  /** Find data-hub-id from element or nearest ancestor. */
  function resolveHubId(el) {
    var cur = el;
    while (cur && cur !== document.body) {
      var v = cur.getAttribute('data-hub-id');
      if (v) return v;
      cur = cur.parentElement;
    }
    return null;
  }

  /** Build the inline annotation form element. */
  function buildForm(widgetId, hubId, trigger) {
    var form = document.createElement('div');
    form.className = FORM_CLASS;
    form.style.cssText = [
      'position:absolute',
      'z-index:9999',
      'background:#fff',
      'border:1px solid #d1d5db',
      'border-radius:8px',
      'padding:12px',
      'box-shadow:0 4px 16px rgba(0,0,0,0.12)',
      'width:280px',
      'font-family:sans-serif',
      'font-size:13px',
    ].join(';');

    var categoryOptions = CATEGORY_OPTIONS.map(function (o) {
      return '<option value="' + o.value + '">' + o.label + '</option>';
    }).join('');

    form.innerHTML = [
      '<div style="font-weight:600;margin-bottom:8px;color:#374151">Add Annotation</div>',
      '<textarea id="ihf-body" placeholder="Describe your feedback…"',
      '  style="width:100%;height:70px;resize:vertical;border:1px solid #d1d5db;',
      '         border-radius:4px;padding:6px;font-size:12px;box-sizing:border-box"></textarea>',
      '<select id="ihf-category"',
      '  style="width:100%;margin-top:6px;border:1px solid #d1d5db;border-radius:4px;',
      '         padding:5px;font-size:12px">',
      categoryOptions,
      '</select>',
      '<div style="display:flex;gap:6px;margin-top:8px">',
      '  <button id="ihf-submit"',
      '    style="background:#4f46e5;color:#fff;border:none;border-radius:4px;',
      '           padding:5px 12px;font-size:12px;cursor:pointer">Submit</button>',
      '  <button id="ihf-cancel"',
      '    style="background:transparent;border:1px solid #d1d5db;border-radius:4px;',
      '           padding:5px 10px;font-size:12px;cursor:pointer">Cancel</button>',
      '  <span id="ihf-msg" style="align-self:center;font-size:11px;color:#6b7280"></span>',
      '</div>',
    ].join('');

    // Position below the trigger button.
    function reposition() {
      var rect = trigger.getBoundingClientRect();
      form.style.top  = (window.scrollY + rect.bottom + 4) + 'px';
      form.style.left = (window.scrollX + rect.left)       + 'px';
    }

    document.body.appendChild(form);
    form.style.position = 'absolute';
    reposition();

    var bodyEl    = form.querySelector('#ihf-body');
    var catEl     = form.querySelector('#ihf-category');
    var submitBtn = form.querySelector('#ihf-submit');
    var cancelBtn = form.querySelector('#ihf-cancel');
    var msgEl     = form.querySelector('#ihf-msg');

    function closeForm() {
      if (form.parentNode) form.parentNode.removeChild(form);
    }

    cancelBtn.addEventListener('click', closeForm);

    // Close on outside click.
    function onOutside(e) {
      if (!form.contains(e.target) && e.target !== trigger) {
        closeForm();
        document.removeEventListener('mousedown', onOutside);
      }
    }
    setTimeout(function () {
      document.addEventListener('mousedown', onOutside);
    }, 10);

    submitBtn.addEventListener('click', function () {
      var body     = bodyEl.value.trim();
      var category = catEl.value;

      if (!body) {
        msgEl.textContent = 'Please enter feedback.';
        msgEl.style.color = '#ef4444';
        return;
      }

      submitBtn.disabled = true;
      msgEl.textContent  = 'Saving…';
      msgEl.style.color  = '#6b7280';

      // Fetch CSRF token from meta tag if present (IHP injects it).
      var csrfMeta  = document.querySelector('meta[name="csrf-token"]');
      var csrfToken = csrfMeta ? csrfMeta.getAttribute('content') : '';

      // Build form-encoded body matching IHP's AnnotationsController.
      var payload = [
        'body='          + encodeURIComponent(body),
        'category='      + encodeURIComponent(category),
        'severity=low',
        'IHFToken='      + encodeURIComponent(csrfToken),
      ].join('&');

      fetch('/widgets/' + widgetId + '/annotations', {
        method:  'POST',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
          'X-CSRF-Token': csrfToken,
        },
        body: payload,
      })
        .then(function (res) {
          if (res.ok || res.redirected) {
            msgEl.textContent = '✓ Saved';
            msgEl.style.color = '#16a34a';
            setTimeout(closeForm, 800);
          } else {
            return res.text().then(function (t) {
              throw new Error('Server returned ' + res.status);
            });
          }
        })
        .catch(function (err) {
          submitBtn.disabled = false;
          msgEl.textContent  = 'Error: ' + err.message;
          msgEl.style.color  = '#ef4444';
        });
    });

    bodyEl.focus();
    return form;
  }

  /** Inject an Annotate trigger button adjacent to a widget envelope. */
  function injectTrigger(el) {
    if (el.classList.contains(LAUNCHER_CLASS)) return;
    el.classList.add(LAUNCHER_CLASS);

    var widgetId = el.getAttribute('data-widget-id');
    var hubId    = resolveHubId(el);

    if (!widgetId) return;

    var trigger = document.createElement('button');
    trigger.className   = TRIGGER_CLASS;
    trigger.textContent = '+ Annotate';
    trigger.setAttribute('type', 'button');
    trigger.setAttribute('title', 'Add annotation for widget ' + widgetId);
    trigger.style.cssText = [
      'font-size:11px',
      'color:#6b7280',
      'background:transparent',
      'border:1px solid #e5e7eb',
      'border-radius:4px',
      'padding:2px 8px',
      'cursor:pointer',
      'margin-top:4px',
    ].join(';');

    trigger.addEventListener('mouseover',  function () { trigger.style.color = '#4f46e5'; trigger.style.borderColor = '#a5b4fc'; });
    trigger.addEventListener('mouseout',   function () { trigger.style.color = '#6b7280'; trigger.style.borderColor = '#e5e7eb'; });

    var activeForm = null;
    trigger.addEventListener('click', function (e) {
      e.stopPropagation();
      if (activeForm && activeForm.parentNode) {
        activeForm.parentNode.removeChild(activeForm);
        activeForm = null;
        return;
      }
      activeForm = buildForm(widgetId, hubId, trigger);
    });

    el.appendChild(trigger);
  }

  /** Scan the DOM for widget envelopes and inject triggers. */
  function scan() {
    var envelopes = document.querySelectorAll('[data-widget-id]');
    for (var i = 0; i < envelopes.length; i++) {
      injectTrigger(envelopes[i]);
    }
  }

  // Initial scan on DOM ready.
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', scan);
  } else {
    scan();
  }

  // Re-scan when IHP AutoRefresh updates the DOM (morphdom fires a custom event).
  document.addEventListener('ihp:morphdom:updated', scan);

  // Also observe mutations for React/Vue SPA rendering.
  if (typeof MutationObserver !== 'undefined') {
    var observer = new MutationObserver(function (mutations) {
      var shouldScan = false;
      for (var i = 0; i < mutations.length; i++) {
        if (mutations[i].addedNodes.length > 0) { shouldScan = true; break; }
      }
      if (shouldScan) scan();
    });
    observer.observe(document.body, { childList: true, subtree: true });
  }

  // Expose for programmatic re-scanning.
  window.IHFAnnotationLauncher = { scan: scan };
})();