/**
 * OTS Signage Modern Theme - Client-Side Utilities
 * Sidebar toggle, dropdown menus, and UI interactions
 */

(function() {
  'use strict';

  const STORAGE_KEYS = {
    sidebarCollapsed: 'otsTheme:sidebarCollapsed'
  };

  /**
   * Initialize sidebar toggle functionality
   */
  function initSidebarToggle() {
    const toggleBtn = document.querySelector('[data-action="toggle-sidebar"]');
    const sidebar = document.querySelector('.ots-sidebar');
    const closeBtn = document.querySelector('.ots-sidebar-close');
    const collapseBtn = document.querySelector('.sidebar-collapse-btn');
    const body = document.body;

    if (!sidebar) return;

    // Handle sidebar close button
    if (closeBtn) {
      closeBtn.addEventListener('click', function(e) {
        e.preventDefault();
        sidebar.classList.remove('active');
      });
    }

    if (toggleBtn) {
      toggleBtn.addEventListener('click', function(e) {
        e.preventDefault();
        sidebar.classList.toggle('active');
      });
    }

    if (collapseBtn) {
      const isCollapsed = localStorage.getItem(STORAGE_KEYS.sidebarCollapsed) === 'true';
      if (isCollapsed) {
        sidebar.classList.add('collapsed');
        body.classList.add('ots-sidebar-collapsed');
      }

      collapseBtn.addEventListener('click', function(e) {
        e.preventDefault();
        const nowCollapsed = !sidebar.classList.contains('collapsed');
        sidebar.classList.toggle('collapsed');
        body.classList.toggle('ots-sidebar-collapsed', nowCollapsed);
        localStorage.setItem(STORAGE_KEYS.sidebarCollapsed, nowCollapsed ? 'true' : 'false');
      });
    }

    // Initialize sidebar section toggles
    initSidebarSectionToggles();

    // Close sidebar when clicking outside on mobile
    document.addEventListener('click', function(e) {
      if (window.innerWidth <= 768) {
        const isClickInsideSidebar = sidebar.contains(e.target);
        const isClickOnToggle = toggleBtn && toggleBtn.contains(e.target);
        
        if (!isClickInsideSidebar && !isClickOnToggle && sidebar.classList.contains('active')) {
          sidebar.classList.remove('active');
        }
      }
    });
  }

  /**
   * Initialize sidebar section collapse/expand functionality
   */
  function initSidebarSectionToggles() {
    const groupToggles = document.querySelectorAll('.sidebar-group-toggle');

    groupToggles.forEach(toggle => {
      toggle.addEventListener('click', function(e) {
        e.preventDefault();

        const group = toggle.closest('.sidebar-group');
        const submenu = group ? group.querySelector('.sidebar-submenu') : null;
        if (!submenu) return;

        const isOpen = group.classList.contains('is-open');
        group.classList.toggle('is-open', !isOpen);
        toggle.setAttribute('aria-expanded', (!isOpen).toString());
        submenu.style.display = isOpen ? 'none' : 'block';
      });
    });
  }

  /**
   * Initialize dropdown menus
   */
  function initDropdowns() {
    const dropdowns = document.querySelectorAll('.dropdown');

    dropdowns.forEach(dropdown => {
      const toggle = dropdown.querySelector('.dropdown-toggle, [data-toggle="dropdown"], .dt-button');
      const menu = dropdown.querySelector('.dropdown-menu');

      if (!toggle || !menu) return;

      // Toggle menu on toggle click
      toggle.addEventListener('click', function(e) {
        e.preventDefault();
        e.stopPropagation();
        dropdown.classList.toggle('active');
      });

      // Close menu when clicking outside
      document.addEventListener('click', function(e) {
        if (!dropdown.contains(e.target)) {
          dropdown.classList.remove('active');
        }
      });
    });
    // Support DataTables Buttons collections which are not wrapped by .dropdown
    document.addEventListener('click', function(e) {
      const btn = e.target.closest('.dt-button');

      if (btn) {
        e.preventDefault();
        e.stopPropagation();

        const wrapper = btn.closest('.dt-buttons') || btn.parentElement;

        // close other open dt-buttons collections
        document.querySelectorAll('.dt-buttons.active').forEach(w => {
          if (w !== wrapper) w.classList.remove('active');
        });

        wrapper.classList.toggle('active');

        // If DataTables placed the collection on the body, find it and position it under the clicked button
        const allCollections = Array.from(document.querySelectorAll('.dt-button-collection'));
        let collection = wrapper.querySelector('.dt-button-collection') || allCollections.find(c => !wrapper.contains(c));

        // If DataTables didn't create a collection element, create one as a fallback
        if (!collection) {
          collection = document.createElement('div');
          collection.className = 'dt-button-collection';
          // prefer to append near wrapper for positioning; fallback to body
          (wrapper || document.body).appendChild(collection);
        }

        if (collection) {
          // hide other collections
          allCollections.forEach(c => { if (c !== collection) { c.classList.remove('show'); c.style.display = 'none'; } });

          const rect = btn.getBoundingClientRect();
          const top = rect.bottom + window.scrollY;
          const left = rect.left + window.scrollX;

          collection.style.position = 'absolute';
          collection.style.top = `${top}px`;
          collection.style.left = `${left}px`;
          collection.style.display = 'block';
          collection.classList.add('show');
          // DEBUG: log collection contents
          try {
            console.log('dt-button-collection opened, children:', collection.children.length, collection);
          } catch (err) {}

          // If the collection is empty or visually empty, build a fallback column list from the nearest table
          const isEmpty = collection.children.length === 0 || collection.textContent.trim() === '' || collection.offsetHeight < 10;
          if (isEmpty) {
            try {
              let table = btn.closest('table') || wrapper.querySelector('table') || document.querySelector('table');
              if (table && window.jQuery && jQuery.fn && jQuery.fn.dataTable && jQuery.fn.dataTable.isDataTable(table)) {
                const dt = jQuery(table).DataTable();
                // clear existing
                collection.innerHTML = '';
                const thead = table.querySelectorAll('thead th');
                thead.forEach((th, idx) => {
                  const text = (th.textContent || th.innerText || `Column ${idx+1}`).trim();
                  const item = document.createElement('div');
                  item.style.padding = '6px 12px';
                  item.style.display = 'flex';
                  item.style.alignItems = 'center';
                  item.style.gap = '8px';
                  const checkbox = document.createElement('input');
                  checkbox.type = 'checkbox';
                  checkbox.checked = dt.column(idx).visible();
                  checkbox.addEventListener('change', function() {
                    dt.column(idx).visible(this.checked);
                  });
                  const label = document.createElement('span');
                  label.textContent = text;
                  label.style.color = 'var(--color-text-primary)';
                  item.appendChild(checkbox);
                  item.appendChild(label);
                  collection.appendChild(item);
                });
                console.log('Fallback: populated collection with', collection.children.length, 'items');
              } else {
                console.log('Fallback: no DataTable instance found to populate column visibility');
              }
            } catch (err) {
              console.warn('Error building fallback column list', err);
            }
          }
        }

        return;
      }

      // click outside dt-button -> close any open collections
      document.querySelectorAll('.dt-buttons.active').forEach(w => w.classList.remove('active'));
    });
  }

  /**
   * Initialize search functionality
   */
  function initSearch() {
    const searchForm = document.querySelector('.topbar-search');
    if (!searchForm) return;

    const input = searchForm.querySelector('.search-input');
    if (input) {
      input.addEventListener('focus', function() {
        searchForm.style.borderColor = 'var(--color-primary)';
      });
      input.addEventListener('blur', function() {
        searchForm.style.borderColor = 'var(--color-border)';
      });
    }
  }

  /**
   * Initialize page specific interactions
   */
  function initPageInteractions() {
    // Displays page - folder selection
    const folderItems = document.querySelectorAll('.folder-item');
    folderItems.forEach(item => {
      item.addEventListener('click', function() {
        folderItems.forEach(f => f.classList.remove('active'));
        this.classList.add('active');
      });
    });

    // Media page - item selection
    const mediaItems = document.querySelectorAll('.media-item');
    mediaItems.forEach(item => {
      item.addEventListener('click', function() {
        this.style.opacity = '0.7';
        setTimeout(() => this.style.opacity = '1', 200);
      });
    });
  }

  /**
   * Make sidebar responsive
   */
  function makeResponsive() {
    const sidebar = document.querySelector('.ots-sidebar');
    const main = document.querySelector('.ots-main');
    
    if (!sidebar) return;
    
    // Add toggle button for mobile
    if (window.innerWidth <= 768) {
      sidebar.classList.add('mobile');
    }
    
    window.addEventListener('resize', function() {
      if (window.innerWidth > 768) {
        sidebar.classList.remove('mobile', 'active');
      } else {
        sidebar.classList.add('mobile');
      }
    });
  }

  /**
   * Prevent Chart.js errors when chart elements are missing
   */
  function initChartSafeguard() {
    if (!window.Chart) return;

    if (typeof window.Chart.acquireContext === 'function') {
      window.Chart.acquireContext = function(item) {
        if (!item) return null;

        const candidate = item.length ? item[0] : item;
        if (candidate && typeof candidate.getContext === 'function') {
          return candidate.getContext('2d');
        }

        return null;
      };
      return;
    }

    if (window.Chart.prototype && typeof window.Chart.prototype.acquireContext === 'function') {
      window.Chart.prototype.acquireContext = function(item) {
        if (!item) return null;

        const candidate = item.length ? item[0] : item;
        if (candidate && typeof candidate.getContext === 'function') {
          return candidate.getContext('2d');
        }

        return null;
      };
    }
  }

  /**
   * Enhance tables: wrap in card, add per-table search box, client-side filtering
   * Non-destructive: skips tables already enhanced
   */
  function enhanceTables() {
    const selector = '.ots-content table, .content table, .container table, .card table, table';
    const tables = Array.from(document.querySelectorAll(selector));
    let counter = 0;

    tables.forEach(table => {
      // only enhance tables that have a thead and tbody
      if (!table || table.classList.contains('modern-table')) return;
      if (!table.querySelector('thead') || !table.querySelector('tbody')) return;

      counter += 1;
      table.classList.add('modern-table');

      // Build wrapper structure
      const wrapper = document.createElement('div');
      wrapper.className = 'modern-table-card';

      const controls = document.createElement('div');
      controls.className = 'table-controls';

      const input = document.createElement('input');
      input.type = 'search';
      input.placeholder = 'Search…';
      input.className = 'table-search-input';
      input.setAttribute('aria-label', 'Table search');
      input.style.minWidth = '180px';

      controls.appendChild(input);

      const tableWrapper = document.createElement('div');
      tableWrapper.className = 'table-wrapper';
      tableWrapper.style.overflow = 'auto';

      // Insert wrapper into DOM in place of the table
      const parent = table.parentNode;
      parent.replaceChild(wrapper, table);
      wrapper.appendChild(controls);
      wrapper.appendChild(tableWrapper);
      tableWrapper.appendChild(table);

      // Simple, light-weight search filtering for this table only
      input.addEventListener('input', function (e) {
        const term = (e.target.value || '').toLowerCase();
        table.querySelectorAll('tbody tr').forEach(tr => {
          const text = tr.textContent.toLowerCase();
          tr.style.display = term === '' || text.includes(term) ? '' : 'none';
        });
      });
    });
  }

  /**
   * Initialize DataTables for enhanced behavior when available.
   * Falls back gracefully if DataTables or jQuery are not present.
   */
  function initDataTables() {
    if (!window.jQuery) return;
    const $ = window.jQuery;
    if (!$.fn || !$.fn.dataTable) return;

    $('.modern-table, table').each(function () {
      try {
        if (!$.fn.dataTable.isDataTable(this)) {
          $(this).DataTable({
            responsive: true,
            lengthChange: false,
            pageLength: 10,
            autoWidth: false,
            dom: '<"table-controls"f>rt<"table-meta"ip>',
            language: { search: '' }
          });
        }
      } catch (err) {
        // If initialization fails, ignore and allow fallback enhancer
        console.warn('DataTables init failed for table', this, err);
      }
    });
  }

  /**
   * Initialize all features when DOM is ready
   */
  function init() {
    initSidebarToggle();
    initDropdowns();
    initSearch();
    initPageInteractions();
    initDataTables();
    enhanceTables();
    makeResponsive();
    initChartSafeguard();
  }

  // Wait for DOM to be ready
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
  } else {
    init();
  }
})();