// ===== THEME TOGGLE =====
function toggleTheme() {
  const html = document.documentElement;
  const currentTheme = html.getAttribute("data-theme");
  const newTheme = currentTheme === "dark" ? "light" : "dark";
  const themeIcon = document.getElementById("themeIcon");

  html.setAttribute("data-theme", newTheme);
  localStorage.setItem("theme", newTheme);
  themeIcon.className = newTheme === "dark" ? "ri-sun-fill" : "ri-moon-fill";
}

// ===== MOBILE MENU TOGGLE =====
function toggleMenu() {
  const navLinks = document.getElementById("navLinks");
  navLinks.classList.toggle("active");
}

// ===== LOAD SAVED THEME =====
window.addEventListener("DOMContentLoaded", () => {
  const savedTheme = localStorage.getItem("theme") || "light";
  const themeIcon = document.getElementById("themeIcon");
  document.documentElement.setAttribute("data-theme", savedTheme);
  themeIcon.className = savedTheme === "dark" ? "ri-sun-fill" : "ri-moon-fill";
});

// ===== SMOOTH SCROLL WITH OFFSET =====
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.offsetTop - offset;
      window.scrollTo({
        top: targetPosition,
        behavior: "smooth",
      });
      // Close mobile menu if open
      document.getElementById("navLinks").classList.remove("active");
    }
  });
});

// ===== SCROLL ANIMATION =====
const observerOptions = {
  threshold: 0.1,
  rootMargin: "0px 0px -100px 0px",
};

const observer = new IntersectionObserver((entries) => {
  entries.forEach((entry) => {
    if (entry.isIntersecting) {
      entry.target.style.opacity = "1";
      entry.target.style.transform = "translateY(0)";
    }
  });
}, observerOptions);

document.querySelectorAll(".glass-card, .timeline-item").forEach((el) => {
  el.style.opacity = "0";
  el.style.transform = "translateY(20px)";
  el.style.transition = "all 0.6s ease";
  observer.observe(el);
});

// ===== SOCIAL LINKS PLACEHOLDERS =====
// Update these with your actual links
const socialLinks = {
  scholar: "https://scholar.google.com/citations?user=h126goIAAAAJ", // Add your Google Scholar URL here
  github: "https://github.com/ntphuc149", // Add your GitHub URL here
  linkedin: "https://www.linkedin.com/in/ntphuc149/", // Add your LinkedIn URL here
};

document.getElementById("scholarLink").addEventListener("click", (e) => {
  if (!socialLinks.scholar) {
    e.preventDefault();
    alert("Please update your Google Scholar link in the script.js file");
  } else {
    window.open(socialLinks.scholar, "_blank");
  }
});

document.getElementById("githubLink").addEventListener("click", (e) => {
  if (!socialLinks.github) {
    e.preventDefault();
    alert("Please update your GitHub link in the script.js file");
  } else {
    window.open(socialLinks.github, "_blank");
  }
});

document.getElementById("linkedinLink").addEventListener("click", (e) => {
  if (!socialLinks.linkedin) {
    e.preventDefault();
    alert("Please update your LinkedIn link in the script.js file");
  } else {
    window.open(socialLinks.linkedin, "_blank");
  }
});

// ===== EXPERIENCE TABS SWITCHING =====
function switchTab(tabName) {
  // Get all tab buttons and contents
  const tabButtons = document.querySelectorAll(".tab-btn");
  const tabContents = document.querySelectorAll(".tab-content");

  // Remove active class from all buttons and contents
  tabButtons.forEach((btn) => btn.classList.remove("active"));
  tabContents.forEach((content) => content.classList.remove("active"));

  // Add active class to clicked button
  const clickedButton = event.target.closest(".tab-btn");
  if (clickedButton) {
    clickedButton.classList.add("active");
  }

  // Show corresponding tab content
  const targetTab = document.getElementById(tabName + "-tab");
  if (targetTab) {
    targetTab.classList.add("active");
  }
}