(function() {
  'use strict';

  // Language Toggle Functionality
  var currentLang = localStorage.getItem('est-trade-lang') || 'he';
  var langToggle = document.getElementById('langToggle');
  var langToggleText = langToggle ? langToggle.querySelector('.lang-toggle-text') : null;

  function setLanguage(lang) {
    currentLang = lang;
    localStorage.setItem('est-trade-lang', lang);
    
    var htmlEl = document.documentElement;
    
    if (lang === 'en') {
      htmlEl.setAttribute('lang', 'en');
      htmlEl.setAttribute('dir', 'ltr');
      if (langToggleText) langToggleText.textContent = 'עב';
    } else {
      htmlEl.setAttribute('lang', 'he');
      htmlEl.setAttribute('dir', 'rtl');
      if (langToggleText) langToggleText.textContent = 'EN';
    }
    
    var translatableElements = document.querySelectorAll('[data-lang-he][data-lang-en]');
    translatableElements.forEach(function(el) {
      var heText = el.getAttribute('data-lang-he');
      var enText = el.getAttribute('data-lang-en');
      el.textContent = lang === 'en' ? enText : heText;
    });
    
    updatePageTitle(lang);
  }

  function updatePageTitle(lang) {
    var titleEl = document.querySelector('title');
    if (!titleEl) return;
    
    var currentTitle = titleEl.textContent;
    
    if (window.location.pathname.includes('contact')) {
      titleEl.textContent = lang === 'en' ? 'Contact Us | Est Trade' : 'צור קשר | Est Trade';
    } else {
      titleEl.textContent = lang === 'en' ? 'Est Trade | Professional Import & Export' : 'Est Trade | יבוא ויצוא מקצועי לעסקים';
    }
  }

  if (langToggle) {
    langToggle.addEventListener('click', function() {
      var newLang = currentLang === 'he' ? 'en' : 'he';
      setLanguage(newLang);
    });
  }

  // Initialize language on page load
  if (currentLang) {
    setLanguage(currentLang);
  }

  // Mobile Navigation Toggle
  var navToggle = document.querySelector('.nav-toggle');
  var navLinks = document.querySelector('.nav-links');

  if (navToggle && navLinks) {
    navToggle.addEventListener('click', function() {
      var isExpanded = this.getAttribute('aria-expanded') === 'true';
      this.setAttribute('aria-expanded', !isExpanded);
      navLinks.classList.toggle('is-open');
    });

    // Close menu when clicking a link
    navLinks.querySelectorAll('a').forEach(function(link) {
      link.addEventListener('click', function() {
        navToggle.setAttribute('aria-expanded', 'false');
        navLinks.classList.remove('is-open');
      });
    });

    // Close menu when clicking outside
    document.addEventListener('click', function(e) {
      if (!navToggle.contains(e.target) && !navLinks.contains(e.target)) {
        navToggle.setAttribute('aria-expanded', 'false');
        navLinks.classList.remove('is-open');
      }
    });
  }

  // Scroll Reveal Animation
  var prefersReducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  if (!prefersReducedMotion) {
    var revealElements = document.querySelectorAll(
      '.about-content, .about-visual, .service-card, .advantage-item, ' +
      '.testimonial-card, .partner-logo, .section-header, .hero-content, ' +
      '.hero-stats, .info-card, .contact-form'
    );

    revealElements.forEach(function(el) {
      el.classList.add('reveal');
    });

    var observerOptions = {
      root: null,
      rootMargin: '0px 0px -50px 0px',
      threshold: 0.1
    };

    var revealObserver = new IntersectionObserver(function(entries) {
      entries.forEach(function(entry) {
        if (entry.isIntersecting) {
          entry.target.classList.add('is-visible');
          revealObserver.unobserve(entry.target);
        }
      });
    }, observerOptions);

    revealElements.forEach(function(el) {
      revealObserver.observe(el);
    });
  }

  // Contact Form Handling with Validation
  var contactForm = document.getElementById('contactForm');
  var formSuccess = document.getElementById('formSuccess');

  if (contactForm && formSuccess) {
    var validators = {
      name: {
        validate: function(value) { return value.trim().length >= 2; },
        messageHe: 'נא להזין שם מלא',
        messageEn: 'Please enter your full name'
      },
      email: {
        validate: function(value) { return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value); },
        messageHe: 'נא להזין כתובת אימייל תקינה',
        messageEn: 'Please enter a valid email address'
      },
      phone: {
        validate: function(value) { return /^[\d\-\+\s]{9,}$/.test(value); },
        messageHe: 'נא להזין מספר טלפון תקין',
        messageEn: 'Please enter a valid phone number'
      },
      message: {
        validate: function(value) { return value.trim().length >= 10; },
        messageHe: 'נא להזין הודעה (לפחות 10 תווים)',
        messageEn: 'Please enter a message (at least 10 characters)'
      }
    };

    function validateField(field) {
      var validator = validators[field.name];
      if (!validator) return true;

      var errorEl = field.parentElement.querySelector('.form-error');
      var isValid = validator.validate(field.value);

      if (!isValid) {
        field.classList.add('is-invalid');
        if (errorEl) {
          errorEl.textContent = currentLang === 'en' ? validator.messageEn : validator.messageHe;
        }
      } else {
        field.classList.remove('is-invalid');
        if (errorEl) errorEl.textContent = '';
      }

      return isValid;
    }

    // Real-time validation on blur
    Object.keys(validators).forEach(function(fieldName) {
      var field = contactForm.querySelector('[name="' + fieldName + '"]');
      if (field) {
        field.addEventListener('blur', function() {
          validateField(this);
        });
        field.addEventListener('input', function() {
          if (this.classList.contains('is-invalid')) {
            validateField(this);
          }
        });
      }
    });

    contactForm.addEventListener('submit', function(e) {
      e.preventDefault();
      
      var isFormValid = true;
      
      Object.keys(validators).forEach(function(fieldName) {
        var field = contactForm.querySelector('[name="' + fieldName + '"]');
        if (field && !validateField(field)) {
          isFormValid = false;
        }
      });

      if (!isFormValid) {
        var firstInvalid = contactForm.querySelector('.is-invalid');
        if (firstInvalid) firstInvalid.focus();
        return;
      }
      
      var submitBtn = contactForm.querySelector('button[type="submit"]');
      var originalText = submitBtn.textContent;
      submitBtn.textContent = currentLang === 'en' ? 'Sending...' : 'שולח...';
      submitBtn.disabled = true;

      setTimeout(function() {
        contactForm.hidden = true;
        formSuccess.hidden = false;
      }, 1000);
    });
  }

  // Smooth scroll for anchor links with header offset
  document.querySelectorAll('a[href^="#"]').forEach(function(anchor) {
    anchor.addEventListener('click', function(e) {
      var targetId = this.getAttribute('href');
      if (targetId === '#') return;
      
      var targetElement = document.querySelector(targetId);
      if (targetElement) {
        e.preventDefault();
        var headerHeight = document.querySelector('.site-header').offsetHeight;
        var targetPosition = targetElement.getBoundingClientRect().top + window.pageYOffset - headerHeight - 20;
        
        window.scrollTo({
          top: targetPosition,
          behavior: prefersReducedMotion ? 'auto' : 'smooth'
        });
      }
    });
  });

  // Header background enhancement on scroll
  var header = document.querySelector('.site-header');

  if (header) {
    window.addEventListener('scroll', function() {
      var currentScroll = window.pageYOffset;
      
      if (currentScroll > 100) {
        header.style.background = 'rgba(10, 22, 40, 0.98)';
      } else {
        header.style.background = 'rgba(10, 22, 40, 0.95)';
      }
    }, { passive: true });
  }

})();