/**
 * Mobile FixedInput + autoheight for comment respond (legacy parity).
 */
(function () {
  'use strict';

  function FixedInput(el, action) {
    if (!el) return;
    if (!el.dataset.fixedBound) {
      el.addEventListener('click', function (e) {
        if (e.target && e.target.closest && e.target.closest('.fixed-body')) {
          FixedInput(el, 'hide');
        }
      });
      el.dataset.fixedBound = '1';
    }
    if (action === 'show') {
      el.classList.add('show');
      window.setTimeout(function () {
        var field = el.querySelector('textarea, input');
        if (field) field.focus();
      }, 100);
      return;
    }
    if (action === 'hide') {
      var cancel = el.querySelector('#cancel-comment-reply-link');
      if (cancel) cancel.click();
      el.querySelectorAll('input,textarea').forEach(function (n) {
        try { n.blur(); } catch (e) {}
      });
      el.querySelectorAll('.dropup.open, .open').forEach(function (n) {
        n.classList.remove('open');
      });
      el.classList.remove('show');
    }
  }

  document.addEventListener('click', function (e) {
    var trigger = e.target && e.target.closest ? e.target.closest('[fixed-input]') : null;
    if (!trigger) return;
    e.preventDefault();
    var targetSel = trigger.getAttribute('fixed-input') || '#respond';
    var panel = document.querySelector(targetSel);
    var comments = document.getElementById('comments');
    if (comments && comments.scrollIntoView) {
      comments.scrollIntoView({ behavior: 'smooth', block: 'start' });
    }
    FixedInput(panel, 'show');
  });

  // Autoheight textareas.
  function bindAutoheight(ta) {
    if (!ta || ta.dataset.autoheightBound) return;
    ta.dataset.autoheightBound = '1';
    var max = parseInt(ta.getAttribute('maxheight') || '188', 10) || 188;
    var resize = function () {
      ta.style.height = 'auto';
      var h = Math.min(ta.scrollHeight, max);
      ta.style.height = h + 'px';
      ta.style.overflowY = ta.scrollHeight > max ? 'auto' : 'hidden';
    };
    ta.addEventListener('input', resize);
    resize();
  }

  function scan() {
    document.querySelectorAll('textarea[autoheight], textarea.grin').forEach(bindAutoheight);
  }

  function init() {
    scan();
    // Expose for submit hide.
    var respond = document.getElementById('respond');
    if (respond) {
      respond.aksrtFixedInput = function (action) {
        FixedInput(respond, action);
      };
    }
  }

  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', init);
  else init();
  // AJAX 注入新内容后由 auto_fun 重扫（dataset 标记保证幂等）。
  if (window.jQuery) window.jQuery(document).on('auto_fun', init);

  window.AksrtFixedInput = FixedInput;
})();