/* ==========================================================================
   Ertunç Özbay — Workshop & Portfolio Script (Plain JS, No Dependencies)
   Handles:
   1. Accessible mobile navigation menu toggle (with Escape key support)
   2. Luminous Aurora / Daylight Studio theme switcher (persisted in localStorage)
   3. Static blog category filtering on the Blog page
   4. One-click copy email button on Contact page
   5. Image lightbox for hardware prototype photos and schematics
   ========================================================================== */

(function () {
  "use strict";

  // 1. Theme Switcher (Vibrant Aurora Default + Daylight Studio Mode)
  var rootEl = document.documentElement;
  var savedTheme = null;
  try {
    savedTheme = localStorage.getItem("eo-theme");
  } catch (e) {}

  if (savedTheme === "light" || savedTheme === "dark") {
    rootEl.setAttribute("data-theme", savedTheme);
  }

  var navList = document.querySelector(".nav-list");
  if (navList && !document.querySelector("[data-theme-toggle]")) {
    var li = document.createElement("li");
    var btn = document.createElement("button");
    btn.type = "button";
    btn.className = "theme-toggle";
    btn.setAttribute("data-theme-toggle", "");
    btn.setAttribute("aria-label", "Toggle color theme");

    function updateThemeBtnLabel() {
      var isLight = rootEl.getAttribute("data-theme") === "light";
      btn.textContent = isLight ? "🌙 Aurora" : "☀️ Daylight";
    }
    updateThemeBtnLabel();

    btn.addEventListener("click", function () {
      var isLight = rootEl.getAttribute("data-theme") === "light";
      var nextTheme = isLight ? "dark" : "light";
      rootEl.setAttribute("data-theme", nextTheme);
      try {
        localStorage.setItem("eo-theme", nextTheme);
      } catch (e) {}
      updateThemeBtnLabel();
    });

    li.appendChild(btn);
    navList.appendChild(li);
  }

  // 2. Mobile Navigation Toggle
  var navToggle = document.querySelector("[data-nav-toggle]");
  var siteNav = document.querySelector("[data-site-nav]");

  if (navToggle && siteNav) {
    navToggle.addEventListener("click", function () {
      var isExpanded = navToggle.getAttribute("aria-expanded") === "true";
      var nextState = !isExpanded;
      navToggle.setAttribute("aria-expanded", String(nextState));
      siteNav.classList.toggle("is-open", nextState);
      var labelSpan = navToggle.querySelector("[data-nav-label]");
      if (labelSpan) {
        labelSpan.textContent = nextState ? "Close" : "Menu";
      }
    });

    document.addEventListener("keydown", function (event) {
      if (event.key === "Escape" && siteNav.classList.contains("is-open")) {
        navToggle.setAttribute("aria-expanded", "false");
        siteNav.classList.remove("is-open");
        var labelSpan = navToggle.querySelector("[data-nav-label]");
        if (labelSpan) {
          labelSpan.textContent = "Menu";
        }
        navToggle.focus();
      }
    });
  }

  // 3. Blog Category Filter
  var filterButtons = document.querySelectorAll("[data-blog-filter]");
  var blogCards = document.querySelectorAll("[data-blog-category]");
  var filterStatus = document.getElementById("blog-filter-status");

  if (filterButtons.length > 0 && blogCards.length > 0) {
    filterButtons.forEach(function (button) {
      button.addEventListener("click", function () {
        var selectedCategory = button.getAttribute("data-blog-filter");

        filterButtons.forEach(function (btn) {
          btn.setAttribute("aria-pressed", btn === button ? "true" : "false");
        });

        var visibleCount = 0;
        blogCards.forEach(function (card) {
          var categories = (card.getAttribute("data-blog-category") || "").split(",");
          var match = selectedCategory === "all" || categories.indexOf(selectedCategory) !== -1;
          card.hidden = !match;
          if (match) {
            visibleCount += 1;
          }
        });

        if (filterStatus) {
          filterStatus.textContent =
            "Showing " + visibleCount + (visibleCount === 1 ? " entry" : " entries") +
            (selectedCategory === "all" ? "." : " in selected category.");
        }
      });
    });
  }

  // 4. Copy Email to Clipboard Buttons
  var copyButtons = document.querySelectorAll("[data-copy-email]");
  copyButtons.forEach(function (btn) {
    btn.addEventListener("click", function () {
      var email = btn.getAttribute("data-copy-email");
      if (!email || !navigator.clipboard) return;
      var originalText = btn.textContent;
      navigator.clipboard.writeText(email).then(function () {
        btn.textContent = "✓ Copied: " + email;
        setTimeout(function () {
          btn.textContent = originalText;
        }, 2200);
      });
    });
  });

  // 5. Image Lightbox for Hardware Photos & Schematics
  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();
    });
  }
})();