(function() {
  'use strict';

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

  if (navToggle && navLinks) {
    navToggle.addEventListener('click', function() {
      const 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
  const prefersReducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  if (!prefersReducedMotion) {
    const 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');
    });

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

    const 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
  const contactForm = document.getElementById('contactForm');
  const formSuccess = document.getElementById('formSuccess');

  if (contactForm && formSuccess) {
    const validators = {
      name: {
        validate: function(value) { return value.trim().length >= 2; },
        message: 'נא להזין שם מלא'
      },
      email: {
        validate: function(value) { return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value); },
        message: 'נא להזין כתובת אימייל תקינה'
      },
      phone: {
        validate: function(value) { return /^[\d\-\+\s]{9,}$/.test(value); },
        message: 'נא להזין מספר טלפון תקין'
      },
      message: {
        validate: function(value) { return value.trim().length >= 10; },
        message: 'נא להזין הודעה (לפחות 10 תווים)'
      }
    };

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

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

      if (!isValid) {
        field.classList.add('is-invalid');
        if (errorEl) errorEl.textContent = validator.message;
      } else {
        field.classList.remove('is-invalid');
        if (errorEl) errorEl.textContent = '';
      }

      return isValid;
    }

    // Real-time validation on blur
    Object.keys(validators).forEach(function(fieldName) {
      const 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();
      
      let isFormValid = true;
      
      Object.keys(validators).forEach(function(fieldName) {
        const field = contactForm.querySelector('[name="' + fieldName + '"]');
        if (field && !validateField(field)) {
          isFormValid = false;
        }
      });

      if (!isFormValid) {
        const firstInvalid = contactForm.querySelector('.is-invalid');
        if (firstInvalid) firstInvalid.focus();
        return;
      }
      
      const submitBtn = contactForm.querySelector('button[type="submit"]');
      const originalText = submitBtn.textContent;
      submitBtn.textContent = '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) {
      const targetId = this.getAttribute('href');
      if (targetId === '#') return;
      
      const targetElement = document.querySelector(targetId);
      if (targetElement) {
        e.preventDefault();
        const headerHeight = document.querySelector('.site-header').offsetHeight;
        const targetPosition = targetElement.getBoundingClientRect().top + window.pageYOffset - headerHeight - 20;
        
        window.scrollTo({
          top: targetPosition,
          behavior: prefersReducedMotion ? 'auto' : 'smooth'
        });
      }
    });
  });

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

  if (header) {
    window.addEventListener('scroll', function() {
      const 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 });
  }

})();