/**
 * Document navigation AJAX (zibll page-template documentnav subset).
 *
 * @package AKSRT
 */
(function () {
  'use strict';

  function ajaxUrl() {
    if (window.aksrtData && window.aksrtData.ajaxUrl) return window.aksrtData.ajaxUrl;
    return '/wp-admin/admin-ajax.php';
  }

  function toast(msg, type) {
    if (window.aksrt && typeof window.aksrt.toast === 'function') {
      window.aksrt.toast(msg, type || 'info');
      return;
    }
    // eslint-disable-next-line no-alert
    window.alert(msg);
  }

  function qs(sel, root) {
    return (root || document).querySelector(sel);
  }

  function qsa(sel, root) {
    return Array.prototype.slice.call((root || document).querySelectorAll(sel));
  }

  function documentAjax(triggerEl, data, url) {
    var container = qs('.document-nav-container');
    var searchBox = qs('.document-search');
    if (!container) return;

    container.classList.add('is-loading');
    if (searchBox && data && data.search) searchBox.classList.add('is-loading');

    data = data || {};
    data.one_cat = container.getAttribute('data-one-cat') || '';
    data.action = 'aksrt_documentnav_posts';

    var body = new URLSearchParams();
    Object.keys(data).forEach(function (k) {
      if (data[k] !== undefined && data[k] !== null) body.append(k, data[k]);
    });

    fetch(url || ajaxUrl(), {
      method: 'POST',
      credentials: 'same-origin',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
      body: body.toString(),
    })
      .then(function (r) { return r.json(); })
      .then(function (n) {
        if (!n || n.error || !n.html) {
          toast((n && n.msg) || '加载失败，请重试', 'danger');
        }
        if (n && n.html) container.innerHTML = n.html;
        if (n && n.history_search) {
          var hist = qs('.history-search > div');
          if (hist) hist.innerHTML = n.history_search;
        }
      })
      .catch(function () {
        toast('网络错误', 'danger');
      })
      .finally(function () {
        container.classList.remove('is-loading');
        if (searchBox) searchBox.classList.remove('is-loading');
        if (triggerEl && triggerEl.classList) triggerEl.classList.remove('is-loading');
      });
  }

  function initAccordion() {
    var nav = qs('.document-nav');
    if (!nav) return;
    nav.addEventListener('click', function (e) {
      var toggle = e.target.closest('.panel-toggle[data-toggle="collapse"]');
      if (!toggle) return;
      e.preventDefault();
      var targetSel = toggle.getAttribute('data-target');
      var panel = targetSel ? qs(targetSel, nav) : null;
      if (!panel) return;
      var parentSel = toggle.getAttribute('data-parent');
      if (parentSel) {
        var parent = qs(parentSel, nav);
        if (parent) {
          qsa('.panel-collapse.is-open, .panel-collapse.in', parent).forEach(function (p) {
            if (p !== panel) {
              p.classList.remove('is-open', 'in');
              var t = parent.querySelector('[data-target="#' + p.id + '"]');
              if (t) t.classList.add('collapsed');
            }
          });
        }
      }
      var open = panel.classList.contains('is-open') || panel.classList.contains('in');
      if (open) {
        panel.classList.remove('is-open', 'in');
        toggle.classList.add('collapsed');
      } else {
        panel.classList.add('is-open', 'in');
        toggle.classList.remove('collapsed');
      }
    });
  }

  function initSearch() {
    var form = qs('.document-search-form');
    if (!form) return;
    form.addEventListener('submit', function (e) {
      e.preventDefault();
      var input = form.querySelector('[name="s"]');
      var search = input ? String(input.value || '').trim() : '';
      if (!search.length) {
        toast('请输入搜索关键词', 'warning');
        return;
      }
      if (search.length < 2) {
        toast('关键词太短', 'warning');
        return;
      }
      qsa('.cat-load').forEach(function (el) {
        el.classList.remove('is-loading', 'active');
      });
      documentAjax(qs('.document-search'), { search: search });
    });

    document.addEventListener('click', function (e) {
      var kw = e.target.closest('.document-search .search_keywords');
      if (!kw) return;
      e.preventDefault();
      var text = (kw.textContent || '').trim();
      var input = qs('.document-search-form [name="s"]');
      if (input) {
        input.value = text;
        input.dispatchEvent(new Event('input', { bubbles: true }));
      }
      if (form) form.dispatchEvent(new Event('submit', { cancelable: true, bubbles: true }));
    });
  }

  function initCatLoad() {
    document.addEventListener('click', function (e) {
      var a = e.target.closest('.cat-load');
      if (!a) return;
      e.preventDefault();
      qsa('.cat-load').forEach(function (el) {
        el.classList.remove('is-loading', 'active');
      });
      a.classList.add('is-loading', 'active');
      var catId = a.getAttribute('data-cat-id') || a.getAttribute('cat-id') || '';
      documentAjax(a, { cat_id: catId });
    });
  }

  function initPager() {
    document.addEventListener('click', function (e) {
      var a = e.target.closest('.document-nav-container .pagenav a');
      if (!a) return;
      e.preventDefault();
      var paged = a.getAttribute('data-paged') || '';
      var href = a.getAttribute('href') || '';
      if (paged) {
        // Prefer current context from last active cat or search.
        var active = qs('.cat-load.active');
        var searchInput = qs('.document-search-form [name="s"]');
        var data = { paged: paged };
        if (active) {
          data.cat_id = active.getAttribute('data-cat-id') || '';
        } else if (searchInput && searchInput.value) {
          data.search = searchInput.value.trim();
        }
        documentAjax(a, data);
        return;
      }
      if (href && href.indexOf('admin-ajax.php') !== -1) {
        documentAjax(a, {}, href);
      }
    });
  }

  function init() {
    if (!qs('.document-nav-container') && !qs('.document-nav')) return;
    initAccordion();
    initSearch();
    initCatLoad();
    initPager();
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
  } else {
    init();
  }
})();