// Handle role-based UI elements
document.addEventListener('DOMContentLoaded', function() {
    // Get user role from localStorage (simulated)
    const userRole = localStorage.getItem('userRole') || 'teacher';
    
    // Hide/show elements based on role
    const adminElements = document.querySelectorAll('.admin-only');
    const teacherElements = document.querySelectorAll('.teacher-only');
    const studentElements = document.querySelectorAll('.student-only');
    
    if (userRole === 'admin') {
        adminElements.forEach(el => el.style.display = 'block');
        teacherElements.forEach(el => el.style.display = 'none');
        studentElements.forEach(el => el.style.display = 'none');
    } else if (userRole === 'teacher') {
        adminElements.forEach(el => el.style.display = 'none');
        teacherElements.forEach(el => el.style.display = 'block');
        studentElements.forEach(el => el.style.display = 'none');
    } else {
        adminElements.forEach(el => el.style.display = 'none');
        teacherElements.forEach(el => el.style.display = 'none');
        studentElements.forEach(el => el.style.display = 'block');
    }
    
    // Mobile menu toggle
    const mobileMenuButton = document.getElementById('mobile-menu-button');
    const mobileMenu = document.getElementById('mobile-menu');
    
    if (mobileMenuButton && mobileMenu) {
        mobileMenuButton.addEventListener('click', function() {
            const expanded = this.getAttribute('aria-expanded') === 'true';
            this.setAttribute('aria-expanded', !expanded);
            mobileMenu.classList.toggle('hidden');
        });
    }
});

// Calculate age from birth date
function calculateAge(birthDate) {
    const today = new Date();
    const birth = new Date(birthDate);
    let age = today.getFullYear() - birth.getFullYear();
    const monthDiff = today.getMonth() - birth.getMonth();
    
    if (monthDiff < 0 || (monthDiff === 0 && today.getDate() < birth.getDate())) {
        age--;
    }
    
    return age;
}

// Simulate sending WhatsApp message
function sendWhatsAppMessage(phone, message) {
    const encodedMessage = encodeURIComponent(message);
    window.open(`https://wa.me/${phone}?text=${encodedMessage}`, '_blank');
}