/**
 * Ertunç Özbay — Personal Engineering Website
 * Theme toggle (Light / Dark), copy helpers, and image zoom
 */
(function () {
  "use strict";

  var STORAGE_KEY = "ertunc_site_theme";
  var root = document.documentElement;

  function applyTheme(theme) {
    var mode = theme === "dark" ? "dark" : "light";
    root.setAttribute("data-theme", mode);
    try {
      localStorage.setItem(STORAGE_KEY, mode);
    } catch (e) {}

    document.querySelectorAll(".theme-btn[data-set-theme]").forEach(function (btn) {
      var isMatch = btn.getAttribute("data-set-theme") === mode;
      btn.classList.toggle("active", isMatch);
      btn.setAttribute("aria-pressed", isMatch ? "true" : "false");
    });
  }

  var saved = null;
  try {
    saved = localStorage.getItem(STORAGE_KEY);
  } catch (e) {}
  applyTheme(saved === "dark" ? "dark" : "light");

  document.querySelectorAll(".theme-btn[data-set-theme]").forEach(function (btn) {
    btn.addEventListener("click", function () {
      applyTheme(btn.getAttribute("data-set-theme"));
    });
  });

  // Copy Email Button
  var copyEmailBtns = document.querySelectorAll("[data-copy-email]");
  copyEmailBtns.forEach(function (btn) {
    btn.addEventListener("click", function () {
      var email = btn.getAttribute("data-copy-email") || "ertunc.ozbay@outlook.com";
      if (!navigator.clipboard) return;
      navigator.clipboard.writeText(email).then(function () {
        var orig = btn.textContent;
        btn.textContent = "Copied: " + email;
        setTimeout(function () {
          btn.textContent = orig;
        }, 2000);
      });
    });
  });

  // Copy Code Block Button
  document.querySelectorAll("[data-copy-code]").forEach(function (btn) {
    btn.addEventListener("click", function () {
      var wrapper = btn.closest(".code-window");
      if (!wrapper) return;
      var codeEl = wrapper.querySelector("pre code");
      if (!codeEl || !navigator.clipboard) return;
      navigator.clipboard.writeText(codeEl.textContent).then(function () {
        var orig = btn.textContent;
        btn.textContent = "Copied";
        setTimeout(function () {
          btn.textContent = orig;
        }, 1800);
      });
    });
  });

  // Image Lightbox
  var zoomImages = document.querySelectorAll(".zoomable-img");
  if (zoomImages.length > 0) {
    var backdrop = document.createElement("div");
    backdrop.className = "lightbox-backdrop";
    backdrop.hidden = true;
    backdrop.innerHTML =
      '<button type="button" class="lightbox-close" aria-label="Close image preview">Close (Esc)</button>' +
      '<img class="lightbox-Backdrop-img" src="" alt="">' +
      '<div class="lightbox-caption"></div>';
    document.body.appendChild(backdrop);

    var lbImg = backdrop.querySelector(".lightbox-Backdrop-img");
    var lbCap = backdrop.querySelector(".lightbox-caption");
    var lbClose = backdrop.querySelector(".lightbox-close");

    function closeLightbox() {
      backdrop.hidden = true;
      lbImg.src = "";
    }

    zoomImages.forEach(function (img) {
      img.addEventListener("click", function () {
        lbImg.src = img.src;
        lbImg.alt = img.alt || "";
        lbCap.textContent = img.alt || "";
        backdrop.hidden = false;
      });
    });

    lbClose.addEventListener("click", closeLightbox);
    backdrop.addEventListener("click", function (e) {
      if (e.target === backdrop) closeLightbox();
    });
    document.addEventListener("keydown", function (e) {
      if (e.key === "Escape" && !backdrop.hidden) closeLightbox();
    });
  }
})();