// Initialize Lucide Icons
lucide.createIcons();

// ===== MOBILE MENU =====
const menuBtn = document.getElementById('menuBtn');
const closeMenuBtn = document.getElementById('closeMenu');
const mobileMenu = document.getElementById('mobileMenu');
const mobileLinks = document.querySelectorAll('.mobile-nav-link');

function toggleMenu() {
  mobileMenu.classList.toggle('open');
}

menuBtn.addEventListener('click', toggleMenu);
closeMenuBtn.addEventListener('click', toggleMenu);

mobileLinks.forEach(link => {
  link.addEventListener('click', () => {
    mobileMenu.classList.remove('open');
  });
});

// ===== NAVBAR SCROLL EFFECT =====
const navbar = document.getElementById('navbar');
window.addEventListener('scroll', () => {
  if (window.scrollY > 50) {
    navbar.classList.add('scrolled');
  } else {
    navbar.classList.remove('scrolled');
  }
});

// ===== ACTIVE NAV LINK =====
const sections = document.querySelectorAll('section[id]');
const navLinks = document.querySelectorAll('.nav-link');

function updateActiveNav() {
  const scrollY = window.scrollY + 100;
  sections.forEach(section => {
    const sectionTop = section.offsetTop;
    const sectionHeight = section.offsetHeight;
    const sectionId = section.getAttribute('id');

    if (scrollY >= sectionTop && scrollY < sectionTop + sectionHeight) {
      navLinks.forEach(link => {
        link.classList.remove('active');
        if (link.getAttribute('href') === '#' + sectionId) {
          link.classList.add('active');
        }
      });
      // Also update mobile nav
      mobileLinks.forEach(link => {
        link.classList.remove('active');
        if (link.getAttribute('href') === '#' + sectionId) {
          link.classList.add('active');
        }
      });
    }
  });
}

window.addEventListener('scroll', updateActiveNav);

// ===== SCROLL ANIMATIONS =====
const scrollElements = document.querySelectorAll('.scroll-animate');

const observer = new IntersectionObserver(
  (entries) => {
    entries.forEach((entry, index) => {
      if (entry.isIntersecting) {
        // Add staggered delay based on element position
        setTimeout(() => {
          entry.target.classList.add('visible');
        }, 100);
        observer.unobserve(entry.target);
      }
    });
  },
  {
    threshold: 0.1,
    rootMargin: '0px 0px -50px 0px',
  }
);

scrollElements.forEach(el => observer.observe(el));

// ===== SKILL BARS ANIMATION =====
const skillObserver = new IntersectionObserver(
  (entries) => {
    entries.forEach(entry => {
      if (entry.isIntersecting) {
        const bar = entry.target.querySelector('.skill-bar-fill');
        if (bar) {
          setTimeout(() => {
            bar.classList.add('animate');
          }, 200);
        }
        skillObserver.unobserve(entry.target);
      }
    });
  },
  {
    threshold: 0.3,
  }
);

document.querySelectorAll('.skill-item').forEach(item => {
  skillObserver.observe(item);
});

// ===== BACK TO TOP =====
const backToTop = document.getElementById('backToTop');

window.addEventListener('scroll', () => {
  if (window.scrollY > 500) {
    backToTop.classList.add('visible');
  } else {
    backToTop.classList.remove('visible');
  }
});

backToTop.addEventListener('click', () => {
  window.scrollTo({ top: 0, behavior: 'smooth' });
});

// ===== CONTACT FORM =====
const contactForm = document.getElementById('contactForm');
const formSuccess = document.getElementById('formSuccess');

contactForm.addEventListener('submit', (e) => {
  e.preventDefault();

  // Simple visual feedback
  const btn = contactForm.querySelector('button[type="submit"]');
  btn.innerHTML = '<span>Sending...</span>';
  btn.disabled = true;

  setTimeout(() => {
    contactForm.reset();
    formSuccess.classList.remove('hidden');
    formSuccess.style.display = 'block';
    btn.innerHTML = '<i data-lucide="send" class="w-4 h-4"></i><span>Send Message</span>';
    btn.disabled = false;
    lucide.createIcons();

    setTimeout(() => {
      formSuccess.classList.add('hidden');
      formSuccess.style.display = 'none';
    }, 4000);
  }, 1200);
});

// ===== FILE UPLOAD =====
const fileInput = document.getElementById('fileInput');
const fileDropZone = document.getElementById('fileDropZone');
const fileList = document.getElementById('fileList');
let uploadedFiles = [];

function formatFileSize(bytes) {
  if (bytes === 0) return '0 Bytes';
  const k = 1024;
  const sizes = ['Bytes', 'KB', 'MB'];
  const i = Math.floor(Math.log(bytes) / Math.log(k));
  return parseFloat((bytes / Math.pow(k, i)).toFixed(1)) + ' ' + sizes[i];
}

function getFileIcon(fileName) {
  const ext = fileName.split('.').pop().toLowerCase();
  const iconMap = {
    pdf: 'file-text', doc: 'file-text', docx: 'file-text', txt: 'file-text',
    png: 'image', jpg: 'image', jpeg: 'image', gif: 'image', svg: 'image', webp: 'image',
    zip: 'archive', rar: 'archive',
  };
  return iconMap[ext] || 'file';
}

function renderFileList() {
  fileList.innerHTML = '';
  uploadedFiles.forEach((file, index) => {
    const fileItem = document.createElement('div');
    fileItem.className = 'flex items-center justify-between gap-3 p-3 rounded-lg bg-white/[0.03] border border-white/[0.08] group/file transition-all';
    fileItem.innerHTML = `
      <div class="flex items-center gap-3 min-w-0">
        <div class="w-9 h-9 rounded-lg bg-gradient-to-br from-violet-600/20 to-cyan-600/20 flex items-center justify-center flex-shrink-0 border border-violet-500/20">
          <i data-lucide="${getFileIcon(file.name)}" class="w-4 h-4 text-violet-400"></i>
        </div>
        <div class="min-w-0">
          <p class="text-sm font-medium text-white truncate">${file.name}</p>
          <p class="text-xs text-gray-500">${formatFileSize(file.size)}</p>
        </div>
      </div>
      <button type="button" class="remove-file flex-shrink-0 w-8 h-8 rounded-lg flex items-center justify-center text-gray-500 hover:text-red-400 hover:bg-red-500/10 transition-all" data-index="${index}">
        <i data-lucide="x" class="w-4 h-4"></i>
      </button>
    `;
    fileList.appendChild(fileItem);
  });
  lucide.createIcons();

  // Attach remove handlers
  fileList.querySelectorAll('.remove-file').forEach(btn => {
    btn.addEventListener('click', () => {
      const idx = parseInt(btn.getAttribute('data-index'));
      uploadedFiles.splice(idx, 1);
      renderFileList();
    });
  });
}

function handleFiles(files) {
  for (const file of files) {
    if (file.size > 10 * 1024 * 1024) {
      alert(`File "${file.name}" exceeds 10MB limit.`);
      continue;
    }
    if (uploadedFiles.length >= 5) {
      alert('Maximum 5 files allowed.');
      break;
    }
    uploadedFiles.push(file);
  }
  fileInput.value = '';
  renderFileList();
}

fileInput.addEventListener('change', (e) => {
  handleFiles(e.target.files);
});

fileDropZone.addEventListener('dragover', (e) => {
  e.preventDefault();
  fileDropZone.classList.add('border-violet-500/50', 'bg-violet-500/5');
});

fileDropZone.addEventListener('dragleave', (e) => {
  e.preventDefault();
  fileDropZone.classList.remove('border-violet-500/50', 'bg-violet-500/5');
});

fileDropZone.addEventListener('drop', (e) => {
  e.preventDefault();
  fileDropZone.classList.remove('border-violet-500/50', 'bg-violet-500/5');
  handleFiles(e.dataTransfer.files);
});

// ===== TYPING EFFECT (simulated with CSS already) =====
// Re-initialize in case dynamic content was added
setTimeout(() => {
  lucide.createIcons();
}, 100);

// ===== SMOOTH SCROLL FOR ANCHOR LINKS =====
document.querySelectorAll('a[href^="#"]').forEach(anchor => {
  anchor.addEventListener('click', function (e) {
    e.preventDefault();
    const target = document.querySelector(this.getAttribute('href'));
    if (target) {
      const offset = 80;
      const targetPosition = target.getBoundingClientRect().top + window.pageYOffset - offset;
      window.scrollTo({
        top: targetPosition,
        behavior: 'smooth'
      });
    }
  });
});

// ===== PARALLAX ORBs =====
window.addEventListener('scroll', () => {
  const scrolled = window.pageYOffset;
  const orbs = document.querySelectorAll('.orb');
  orbs.forEach((orb, i) => {
    const speed = 0.05 * (i + 1);
    orb.style.transform = `translateY(${scrolled * speed}px)`;
  });
});