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// Configuration object for centralized settings
const TabbedNavConfig = {
  DESKTOP_BREAKPOINT: 1201,
  DEBOUNCE_DELAY: 250,
  OPEN_FIRST_TAB: true,
  CLOSE_TAB_ON_MOUSEOUT: false
};

// Custom config for tabbed hero containers
const tabbedHeroConfig = {
  ...TabbedNavConfig,
  OPEN_FIRST_TAB: false,
  CLOSE_TAB_ON_MOUSEOUT: true
};

// Function to determine the appropriate config based on container context
function getConfigForContainer(container) {
  // Check if container has closest ancestor with [data-tabbed-hero="true"]
  const heroAncestor = container.getAttribute('data-tabbed-hero') === 'true'   ? container : container.closest('[data-tabbed-dropdown="true"]');
  
  if (heroAncestor) {
    return tabbedHeroConfig;
  }
  
  // Check for specific data-instance attributes (if you still want to support them)
  // const instance = container.getAttribute('data-instance');
  // if (instance === 'two') {
  //   // You can still have specific instance configs if needed
  //   return {
  //     ...TabbedNavConfig,
  //     OPEN_FIRST_TAB: false,
  //     CLOSE_TAB_ON_MOUSEOUT: true
  //   };
  // }
  
  // Default config
  return TabbedNavConfig;
}

class TabbedNavigation {
  constructor(container, config = TabbedNavConfig) {
    this.container = container;
    this.config = config;
    this.activeItem = null;
    this.isDesktop = window.innerWidth >= this.config.DESKTOP_BREAKPOINT;
    this.hasMouseListeners = false;
    this.megamenuParent = null;
    this.megamenuObserver = null;
    
    // Initialize bound handlers - these will be reused across reinitializations
    this.mouseEnterHandler = this.handleMouseEnter.bind(this);
    this.mouseLeaveHandler = this.handleMouseLeave.bind(this);
    this.resizeHandler = this.debounce(this.handleResize.bind(this), this.config.DEBOUNCE_DELAY);
    this.handleMegamenuToggle = this.handleMegamenuToggle.bind(this);
    
    this.init();
  }

  init() {
    // Cache DOM elements fresh each time
    this.navItems = [...this.container.querySelectorAll('.dwc-tabbed-nav-list__li')];
    this.elementsCache = new Map();
    
    this.cacheElements();
    this.setupAccessibility();
    this.setupMegamenuObserver();
    this.bindEvents();

    // Set initial state
    this.updateLayout();
    this.setBackText()

    // Show first item on page load only if desktop, not nested, and OPEN_FIRST_TAB is true
    if (this.navItems.length > 0 && this.isDesktop && this.config.OPEN_FIRST_TAB) {
      setTimeout(() => {
        const firstItem = this.navItems[0];

        // Count how many .dwc-tabbed-nav-container ancestors this.container has
        let count = 0;
        let current = this.container.parentElement;
        while (current) {
          if (current.classList?.contains('dwc-tabbed-nav-container')) {
            count++;
          }
          current = current.parentElement;
        }

        const isNested = count >= 1;

        if (!isNested && this.elementsCache.has(firstItem)) {
          this.showTab(firstItem);
        }
      }, 0);
    }
  }

  // Setup observer for megamenu parent
  setupMegamenuObserver() {
    // Find the .brx-has-megamenu parent
    this.megamenuParent = this.container.closest('.brx-has-megamenu');
    
    if (this.megamenuParent) {
      // Set initial inert state
      this.updateInertState();
      
      // Create a MutationObserver to watch for class changes
      this.megamenuObserver = new MutationObserver((mutations) => {
        mutations.forEach((mutation) => {
          if (mutation.type === 'attributes' && mutation.attributeName === 'class') {
            this.updateInertState();
          }
        });
      });
      
      // Start observing the megamenu parent for class changes
      this.megamenuObserver.observe(this.megamenuParent, {
        attributes: true,
        attributeFilter: ['class']
      });
    }
  }

  // Update inert state based on megamenu open/closed state
  updateInertState() {
    if (!this.megamenuParent) return;
    
    const isOpen = this.megamenuParent.classList.contains('open');
    
    if (isOpen) {
      this.container.removeAttribute('inert');
    } else {
      this.container.setAttribute('inert', '');
    }
  }

  // Handle megamenu toggle (for manual triggering if needed)
  handleMegamenuToggle() {
    this.updateInertState();
  }

  // Method to clean up event listeners and reset state
  cleanup() {
    // Remove all event listeners
    this.container.removeEventListener('click', this.handleClick);
    this.container.removeEventListener('keydown', this.handleKeydown);
    this.container.removeEventListener('focus', this.handleFocus);
    
    // Remove mouse listeners if they exist
    if (this.hasMouseListeners) {
      this.container.removeEventListener('mouseenter', this.mouseEnterHandler, true);
      this.container.removeEventListener('mouseleave', this.mouseLeaveHandler, true);
    }
    
    // Remove resize listener
    window.removeEventListener('resize', this.resizeHandler);
    
    // Clean up megamenu observer
    if (this.megamenuObserver) {
      this.megamenuObserver.disconnect();
      this.megamenuObserver = null;
    }
    
    // Reset state
    this.activeItem = null;
    this.hasMouseListeners = false;
    this.megamenuParent = null;
    
    // Clear caches
    if (this.elementsCache) {
      this.elementsCache.clear();
    }
    this.navItems = [];
    
    // Reset all tab states and accessibility attributes
    const allNavItems = this.container.querySelectorAll('.dwc-tabbed-nav-list__li');
    allNavItems.forEach(item => {
      const button = item.querySelector('.dwc-tabbed-nav-list__li__button') || 
                    item.querySelector('.dwc-tabbed-nav-list__li__btn-txt');
      const content = item.querySelector('.dwc-tabbed-nav-list__li__content');
      
      // Remove classes
      item.classList.remove('active');
      
      // Reset button attributes
      if (button) {
        button.removeAttribute('role');
        button.removeAttribute('aria-controls');
        button.removeAttribute('aria-expanded');
        button.removeAttribute('aria-selected');
        button.removeAttribute('tabindex');
        button.removeAttribute('id');
      }
      
      // Reset content attributes
      if (content) {
        content.removeAttribute('role');
        content.removeAttribute('aria-labelledby');
        content.removeAttribute('id');
        content.removeAttribute('aria-hidden');
        content.style.maxHeight = '';
      }
      
      // Remove data attributes
      item.removeAttribute('data-tab-index');
    });
    
    // Reset nav list role
    const navList = this.container.querySelector('.dwc-tabbed-nav-list');
    if (navList) {
      navList.removeAttribute('role');
    }
    
    // Remove inert attribute
    this.container.removeAttribute('inert');
  }

  // Public method to reinitialize the navigation
  reinitialize() {
    this.cleanup();
    this.isDesktop = window.innerWidth >= this.config.DESKTOP_BREAKPOINT; // Use config breakpoint
    this.init();
  }

  // Cache DOM elements to avoid repeated queries
  cacheElements() {
    const uniqueIdBase = `tab-${Date.now()}`;
    
    this.navItems.forEach((item, index) => {
      const button = item.querySelector('.dwc-tabbed-nav-list__li__button') || 
                    item.querySelector('.dwc-tabbed-nav-list__li__btn-txt');
      const content = item.querySelector('.dwc-tabbed-nav-list__li__content');
      
      this.elementsCache.set(item, {
        button,
        content,
        uniqueId: `${uniqueIdBase}-${index}`,
        index
      });
    });
  }

  setupAccessibility() {
    const navList = this.container.querySelector('.dwc-tabbed-nav-list');
    if (!navList) return;
    
    navList.setAttribute('role', 'tablist');
    
    for (const [item, cache] of this.elementsCache) {
      const { button, content, uniqueId, index } = cache;
      
      if (button) {
        button.setAttribute('role', 'tab');
        button.setAttribute('aria-controls', `${uniqueId}-panel`);
        button.setAttribute('aria-expanded', 'false');
        button.setAttribute('aria-selected', 'false');
        button.setAttribute('tabindex', '0');
        button.setAttribute('id', `${uniqueId}-tab`);
      }
      
      if (content) {
        content.setAttribute('role', 'tabpanel');
        content.setAttribute('aria-labelledby', `${uniqueId}-tab`);
        content.setAttribute('id', `${uniqueId}-panel`);
        content.setAttribute('aria-hidden', 'true');
      }
      
      item.setAttribute('data-tab-index', index);
    }
  }

  bindEvents() {
    // Store bound handlers for cleanup
    this.handleClick = this.handleClick.bind(this);
    this.handleKeydown = this.handleKeydown.bind(this);
    this.handleFocus = this.handleFocus.bind(this);
    
    // Single event delegation for better performance
    this.container.addEventListener('click', this.handleClick);
    this.container.addEventListener('keydown', this.handleKeydown);
    this.container.addEventListener('focus', this.handleFocus, true);
    
    // Passive resize listener for better performance
    window.addEventListener('resize', this.resizeHandler, { passive: true });
    
    this.updateMouseListeners();
  }

  updateMouseListeners() {
    if (this.isDesktop && !this.hasMouseListeners) {
      this.container.addEventListener('mouseenter', this.mouseEnterHandler, true);
      this.container.addEventListener('mouseleave', this.mouseLeaveHandler, true);
      this.hasMouseListeners = true;
    } else if (!this.isDesktop && this.hasMouseListeners) {
      this.container.removeEventListener('mouseenter', this.mouseEnterHandler, true);
      this.container.removeEventListener('mouseleave', this.mouseLeaveHandler, true);
      this.hasMouseListeners = false;
    }
  }

  // Helper method to get sibling nav items (nav items in the same container level)
  getSiblingNavItems(navItem) {
    // Find the direct parent container of this nav item
    const navItemContainer = navItem.closest('.dwc-tabbed-nav-list');
    if (!navItemContainer) return [];
    
    // Get all nav items that are direct children of the same container
    const siblingItems = [...navItemContainer.querySelectorAll('.dwc-tabbed-nav-list__li')];
    
    // Filter to only include items that are siblings (not the navItem itself)
    // and check if they belong to any TabbedNavigation instance
    return siblingItems.filter(item => item !== navItem);
  }

  handleFocus(e) {
    if (!this.isDesktop) return;

    const button = e.target.closest('[role="tab"]');
    if (!button) return;
    
    const navItem = button.closest('.dwc-tabbed-nav-list__li');
    if (!navItem || !this.elementsCache.has(navItem)) return;
    
    this.handleTabInteraction(navItem, 'focus');
  }

  handleClick(e) {
    const navItem = e.target.closest('.dwc-tabbed-nav-list__li');
    if (!navItem || !this.elementsCache.has(navItem)) return;
    
    const button = e.target.closest('.dwc-tabbed-nav-list__li__button, .dwc-tabbed-nav-list__li__btn-txt');
    if (!button) return;
    
    e.preventDefault();
    this.handleTabInteraction(navItem, 'click');
  }

  handleKeydown(e) {
    const button = e.target.closest('[role="tab"]');
    if (!button) return;
    
    const navItem = button.closest('.dwc-tabbed-nav-list__li');
    if (!navItem || !this.elementsCache.has(navItem)) return;
    
    const { index: currentIndex } = this.elementsCache.get(navItem);
    
    switch (e.key) {
      case 'Enter':
      case ' ':
        e.preventDefault();
        this.handleTabInteraction(navItem, 'keyboard');
        break;
      case 'ArrowRight':
      case 'ArrowDown':
        e.preventDefault();
        this.focusNextTab(currentIndex);
        break;
      case 'ArrowLeft':
      case 'ArrowUp':
        e.preventDefault();
        this.focusPrevTab(currentIndex);
        break;
      case 'Home':
        e.preventDefault();
        this.focusTab(0);
        break;
      case 'End':
        e.preventDefault();
        this.focusTab(this.navItems.length - 1);
        break;
    }
  }
  
  handleMouseEnter(e) {
    if (!this.isDesktop) return;
    
    const navItem = e.target.closest('.dwc-tabbed-nav-list__li') || 
                   (e.target.matches('.dwc-tabbed-nav-list__li') ? e.target : null);
    if (!navItem || !this.elementsCache.has(navItem)) return;
    
    this.handleTabInteraction(navItem, 'hover');
  }

  handleMouseLeave(e) {
    if (!this.isDesktop) return;
    
    // Only close tabs if CLOSE_TAB_ON_MOUSEOUT is enabled
    if (this.config.CLOSE_TAB_ON_MOUSEOUT) {
      // Check if mouse is leaving the entire container
      const rect = this.container.getBoundingClientRect();
      const { clientX, clientY } = e;
      
      // Check if mouse position is outside the container bounds
      const isOutsideContainer = (
        clientX < rect.left || 
        clientX > rect.right || 
        clientY < rect.top || 
        clientY > rect.bottom
      );
      
      if (isOutsideContainer) {
        this.hideAllTabs();
      }
    }
    // If CLOSE_TAB_ON_MOUSEOUT is false, keep content visible (original behavior)
  }

  // Unified method to handle all tab interactions with nesting support
  handleTabInteraction(navItem, interactionType) {
    if (!this.elementsCache.has(navItem)) return;
    
    if (this.isDesktop) {
      // Simply hide siblings and show the target - works for all scenarios
      this.hideSiblingTabs(navItem);
      this.showTab(navItem);
    } else {
      // Mobile accordion behavior
      if (interactionType === 'click' || interactionType === 'keyboard') {
        this.toggleTabMobile(navItem);
      }
    }
  }

  // Hide only sibling tabs (same container level)
  hideSiblingTabs(navItem) {
   // console.log('Nav Item: ', navItem)
    const siblings = this.getSiblingNavItems(navItem);
    
    siblings.forEach(sibling => {
      
         //console.log('sibling: ', sibling)
      // Only hide siblings that have the active class to avoid affecting other instances
      if (sibling.classList.contains('active')) {
        this.hideSiblingTab(sibling);
      }
    });
  }

  // Hide a sibling tab (used when we know it's a sibling from another instance)
  hideSiblingTab(navItem) {
    const button = navItem.querySelector('.dwc-tabbed-nav-list__li__button') || 
                  navItem.querySelector('.dwc-tabbed-nav-list__li__btn-txt');
    const content = navItem.querySelector('.dwc-tabbed-nav-list__li__content');
    
    if (content && button) {
      content.setAttribute('aria-hidden', 'true');
      button.setAttribute('aria-expanded', 'false');
      button.setAttribute('aria-selected', 'false');
      navItem.classList.remove('active');
      
      // Also handle mobile accordion collapse
      if (!this.isDesktop) {
        content.style.maxHeight = '0';
      }
    }
  }

  // Mobile-specific toggle behavior with proper nesting support
  toggleTabMobile(navItem) {
    if (!this.elementsCache.has(navItem)) return;
    
    const isActive = navItem.classList.contains('active');
    
    if (isActive) {
      this.collapseTab(navItem);
    } else {
      // Close sibling tabs and open this one
      this.hideSiblingTabs(navItem);
      this.expandTab(navItem);
    }
  }

  toggleTab(navItem) {
    if (!this.elementsCache.has(navItem)) return;
    
    if (this.isDesktop) {
      this.handleTabInteraction(navItem, 'click');
    } else {
      this.toggleTabMobile(navItem);
    }
  }

  showTab(navItem) {
    if (!this.elementsCache.has(navItem)) return;
    
    const { button, content } = this.elementsCache.get(navItem);
    
    if (content && button) {
      content.setAttribute('aria-hidden', 'false');
      button.setAttribute('aria-expanded', 'true');
      button.setAttribute('aria-selected', 'true');
      navItem.classList.add('active');
    }
    
    this.setActiveTab(navItem);
  }

  hideTab(navItem) {
    if (!this.elementsCache.has(navItem)) return;
    
    const { button, content } = this.elementsCache.get(navItem);
    
    if (content && button) {
      content.setAttribute('aria-hidden', 'true');
      button.setAttribute('aria-expanded', 'false');
      button.setAttribute('aria-selected', 'false');
      navItem.classList.remove('active');
    }
    
    // Only clear activeItem if it belongs to THIS navigation instance
    // and it's the exact item being hidden
    if (this.activeItem === navItem && this.navItems.includes(navItem)) {
      this.activeItem = null;
    }
  }

  expandTab(navItem) {
    if (!this.elementsCache.has(navItem)) return;
    
    // Close sibling tabs
    this.hideSiblingTabs(navItem);
    
    this.showTab(navItem);
    
    // Smooth height animation
    const { content } = this.elementsCache.get(navItem);
    if (content) {
      const height = content.scrollHeight;
      content.style.maxHeight = `${height}px`;
    }
  }

  collapseTab(navItem) {
    if (!this.elementsCache.has(navItem)) return;
    
    this.hideTab(navItem);
    
    const { content } = this.elementsCache.get(navItem);
    if (content) {
      content.style.maxHeight = '0';
    }
  }

  hideAllTabs() {
    this.navItems.forEach(item => this.hideTab(item));
  }

  setActiveTab(navItem) {
    // Only update aria-selected for tabs in THIS navigation instance
    this.navItems.forEach(item => {
      const cache = this.elementsCache.get(item);
      if (cache?.button) {
        cache.button.setAttribute('aria-selected', item === navItem ? 'true' : 'false');
      }
    });
    
    // Only set activeItem if this navItem belongs to THIS navigation instance
    if (this.navItems.includes(navItem)) {
      this.activeItem = navItem;
    }
  }

  focusTab(index) {
    if (index >= 0 && index < this.navItems.length) {
      const cache = this.elementsCache.get(this.navItems[index]);
      if (cache?.button) {
        cache.button.focus();
      }
    }
  }

  focusNextTab(currentIndex) {
    const nextIndex = (currentIndex + 1) % this.navItems.length;
    this.focusTab(nextIndex);
  }

  focusPrevTab(currentIndex) {
    const prevIndex = currentIndex === 0 ? this.navItems.length - 1 : currentIndex - 1;
    this.focusTab(prevIndex);
  }

  handleResize() {
    const wasDesktop = this.isDesktop;
    this.isDesktop = window.innerWidth >= this.config.DESKTOP_BREAKPOINT; // Use config breakpoint
    
    if (wasDesktop !== this.isDesktop) {
      this.updateMouseListeners();
      this.updateLayout();
    }
  }

  updateLayout() {
    const currentlyActive = this.activeItem;

    // Reset all states
    this.hideAllTabs();

    // Clear inline styles
    this.navItems.forEach(item => {
      const cache = this.elementsCache.get(item);
      if (cache?.content) {
        cache.content.style.maxHeight = '';
      }
    });

    if (this.isDesktop) {
      // Determine if this tab instance is nested
      let count = 0;
      let current = this.container.parentElement;
      while (current) {
        if (current.classList?.contains('dwc-tabbed-nav-container')) {
          count++;
        }
        current = current.parentElement;
      }
      const isNested = count >= 1;

      if (!isNested && this.config.OPEN_FIRST_TAB) {
        if (currentlyActive) {
          this.showTab(currentlyActive);
        } else if (this.navItems.length > 0) {
          this.showTab(this.navItems[0]);
        }
      }
    }
  }

  setBackText(){
    let tabElement = document.querySelector('.dwc-tabbed-nav-container');
    let tabBackText = tabElement.getAttribute('data-back-text')
    document.querySelectorAll('.dwc-tabbed-nav-list__li__button').forEach(tabBtn => {
        const textContent = tabBtn.textContent.trim();
        const tabIcon = tabBtn.querySelector('.dwc-tabbed-nav-list__li__arrow-icon');
        if (tabIcon) {
            tabIcon.setAttribute('data-text', textContent);
            tabIcon.setAttribute('data-back-text', tabBackText);
        }
    });
  }

  // Simple debounce for resize
  debounce(func, wait) {
    let timeout;
    return function executedFunction(...args) {
      const later = () => {
        clearTimeout(timeout);
        func(...args);
      };
      clearTimeout(timeout);
      timeout = setTimeout(later, wait);
    };
  }

  // Public method to destroy the instance completely
  destroy() {
    this.cleanup();
    // Additional cleanup can be added here if needed
  }

  // Public method to manually update inert state (if needed)
  updateInert() {
    this.updateInertState();
  }
}

// Simplified initialization on DOM ready
document.addEventListener('DOMContentLoaded', function() {
  const tabbedNavContainers = document.querySelectorAll('.dwc-tabbed-nav-container');
  
  tabbedNavContainers.forEach(container => {
    // Skip if this container is nested inside another dwc-tabbed-nav-container
    const parentNavContainer = container.parentElement.closest('.dwc-tabbed-nav-container');
    if (parentNavContainer) {
      return; // Skip nested containers
    }
    
    // Get the appropriate config for this container
    const config = getConfigForContainer(container);
    
    // Initialize with the determined config
    new TabbedNavigation(container, config);
  });
});

// For dynamic content - Updated version
window.initTabbedNav = function(container, customConfig = null) {
  if (container && container.classList.contains('dwc-tabbed-nav-container')) {
    // Check if this is a nested container
    const parentNavContainer = container.parentElement.closest('.dwc-tabbed-nav-container');
    if (parentNavContainer) {
      return null; // Don't initialize nested containers
    }
    
    // Use custom config if provided, otherwise determine config automatically
    const config = customConfig || getConfigForContainer(container);
    return new TabbedNavigation(container, config);
  }
  return null;
};

/*
// TO REINITIALIZE USE THIS
// Create an instance of TabbedNavigation
const tabbedNav = new TabbedNavigation(document.querySelector('.dwc-tabbed-nav-container'));

// Call reinitialize on the instance
tabbedNav.reinitialize();

// TO USE WITH CUSTOM CONFIG
const customConfig = {
  DESKTOP_BREAKPOINT: 768,
  DEBOUNCE_DELAY: 300,
  OPEN_FIRST_TAB: false,  // This will prevent first tab from opening automatically
  CLOSE_TAB_ON_MOUSEOUT: true  // This will close tabs when mouse leaves container
};
const tabbedNavCustom = new TabbedNavigation(document.querySelector('.dwc-tabbed-nav-container'), customConfig);

// TO UPDATE ON URL CHANGE
function onUrlChange() {
    setTimeout(function () {
const tabbedNav = new TabbedNavigation(document.querySelector('.dwc-tabbed-nav-container'));
tabbedNav.reinitialize();

    }, 1500); // Delay execution by 2 seconds
}

// Listen for popstate event (history navigation)
window.addEventListener('popstate', onUrlChange);

// Listen for hashchange event (URL hash change)
window.addEventListener('hashchange', onUrlChange);

// Handle pushState and replaceState
(function (history) {
    const pushState = history.pushState;
    const replaceState = history.replaceState;

    history.pushState = function (state) {
        if (typeof history.onpushstate == "function") {
            history.onpushstate({ state: state });
        }
        const result = pushState.apply(history, arguments);
        onUrlChange(); // Call the function when pushState is used
        return result;
    };

    history.replaceState = function (state) {
        if (typeof history.onreplacestate == "function") {
            history.onreplacestate({ state: state });
        }
        const result = replaceState.apply(history, arguments);
        onUrlChange(); // Call the function when replaceState is used
        return result;
    };
})(window.history);

*/

console.log('%c<Jamie Sheehan Web Design Mega Menu Pro Tabbed Navigation v1.0>', 'color: #b388eb');

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Blog & Articles

Explore the latest insights, trends, and best practices in oil product logistics and inspections.

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  • Identify differences between test method nominated versus method performed by inspection companies
  • Communicate real-time test results as they are available for prompt trading opportunities
  • Inspection cost savings from use of Navarik Inspection Price Estimator
  • All data centralised with the ability to extract key information for data analytics