wordpress-theme-aksrt/assets/js/core/theme.js

/**
 * AKSRT Theme Toggle — dark/light mode switching with transitions
 */
(function () {
  "use strict";

  var THEME_KEY = "aksrt-theme";
  var THEME_COOKIE_KEY = "theme_mode";

  function normalizeStoredTheme(value) {
    if (value === "dark" || value === "dark-theme") return "dark";
    if (value === "light" || value === "white-theme") return "light";
    return null;
  }

  function toCookieTheme(value) {
    return value === "dark" ? "dark-theme" : "white-theme";
  }

  function getCookie(name) {
    var parts = document.cookie ? document.cookie.split("; ") : [];
    for (var i = 0; i < parts.length; i++) {
      var pair = parts[i].split("=");
      if (decodeURIComponent(pair[0]) === name) {
        return decodeURIComponent(pair.slice(1).join("="));
      }
    }
    return "";
  }

  function setCookie(name, value, days) {
    var maxAge = days ? "; max-age=" + (days * 24 * 60 * 60) : "";
    var secure = window.location && window.location.protocol === "https:" ? "; Secure" : "";
    document.cookie = encodeURIComponent(name) + "=" + encodeURIComponent(value) + maxAge + "; path=/; SameSite=Lax" + secure;
  }

  function getStoredTheme() {
    var localTheme = null;
    try {
      localTheme = normalizeStoredTheme(localStorage.getItem(THEME_KEY));
    } catch (e) {
      localTheme = null;
    }

    var theme = normalizeStoredTheme(getCookie(THEME_COOKIE_KEY)) || localTheme;
    if (theme) {
      setStoredTheme(theme);
    }
    return theme;
  }

  function setStoredTheme(value) {
    var theme = normalizeStoredTheme(value);
    if (!theme) return;
    try {
      localStorage.setItem(THEME_KEY, theme);
    } catch (e) {}
    setCookie(THEME_COOKIE_KEY, toCookieTheme(theme), 365);
  }

  function getTimeAutoTheme() {
    var hour = (new Date()).getHours();
    return hour >= 20 || hour < 8 ? "dark" : "light";
  }

  function resolveConfiguredTheme(mode) {
    var normalized = normalizeStoredTheme(mode);
    if (normalized) return normalized;
    if (mode === "time-auto" || mode === "auto") {
      return getTimeAutoTheme();
    }
    return "light";
  }

  function syncBrandLogos(isDark) {
    document.querySelectorAll("[data-logo-light]").forEach(function (img) {
      var lightSrc = img.getAttribute("data-logo-light") || "";
      var darkSrc = img.getAttribute("data-logo-dark") || "";
      if (!lightSrc) return;
      img.setAttribute("src", isDark && darkSrc ? darkSrc : lightSrc);
    });
  }

  function syncThemeColorMeta(isDark) {
    var meta = document.querySelector('meta[name="theme-color"]');
    if (!meta) {
      meta = document.createElement("meta");
      meta.setAttribute("name", "theme-color");
      document.head.appendChild(meta);
    }
    meta.setAttribute("content", isDark ? "#2F3135" : "#FDFCFE");
  }

  function getThemeImageAttr(img, name) {
    return img.getAttribute(name) || img.getAttribute("data-" + name) || "";
  }

  function setThemeImageSource(img, src) {
    if (!src || img.getAttribute("src") === src) return;
    img.setAttribute("src", src);
  }

  function syncThemeImages(isDark) {
    document.querySelectorAll("img[switch-src], img[data-switch-src]").forEach(function (img) {
      var darkSrc = getThemeImageAttr(img, "switch-src");
      if (!img.dataset.aksrtThemeLightSrc) {
        img.dataset.aksrtThemeLightSrc = img.getAttribute("src") || "";
      }
      setThemeImageSource(img, isDark && darkSrc ? darkSrc : img.dataset.aksrtThemeLightSrc);
    });

    document.querySelectorAll("img[white-src], img[dark-src], img[data-white-src], img[data-dark-src]").forEach(function (img) {
      var lightSrc = getThemeImageAttr(img, "white-src") || img.dataset.aksrtThemeLightSrc || img.getAttribute("src") || "";
      var darkSrc = getThemeImageAttr(img, "dark-src");
      if (!img.dataset.aksrtThemeLightSrc && lightSrc) {
        img.dataset.aksrtThemeLightSrc = lightSrc;
      }
      setThemeImageSource(img, isDark && darkSrc ? darkSrc : lightSrc);
    });
  }

  function syncCodeHighlightTheme(isDark) {
    if (typeof window.AksrtPrecodeApplyTheme === "function") {
      window.AksrtPrecodeApplyTheme(isDark);
      return;
    }

    var settings = (window.aksrtData && window.aksrtData.codeHighlight) || {};
    var theme = isDark ? (settings.darkTheme || "monokai") : (settings.lightTheme || "enlighter");
    document.querySelectorAll(".enlighter-default").forEach(function (el) {
      el.className = el.className.replace(/\benlighter-t-[\w-]+\b/g, "").replace(/\s+/g, " ").trim();
      el.classList.add("enlighter-t-" + theme);
    });
  }

  function dispatchThemeChange(isDark) {
    try {
      document.dispatchEvent(new CustomEvent("aksrt:theme-change", {
        detail: {
          theme: isDark ? "dark" : "light",
          isDark: isDark
        }
      }));
    } catch (e) {}
  }

  function applyTheme(mode) {
    var isDark = mode === "dark";
    document.documentElement.classList.toggle("dark", isDark);
    document.documentElement.setAttribute("data-theme", isDark ? "dark" : "light");
    document.body.classList.toggle("theme-dark", isDark);
    document.body.classList.toggle("dark-theme", isDark);
    document.body.classList.toggle("white-theme", !isDark);
    document.body.setAttribute("data-theme", isDark ? "dark" : "light");
    syncBrandLogos(isDark);
    syncThemeColorMeta(isDark);
    syncThemeImages(isDark);
    syncCodeHighlightTheme(isDark);
    dispatchThemeChange(isDark);
    // Icon visibility is CSS-driven via html.dark / body.theme-dark.
    // Only sync a11y state here — do not set inline display (fights !important CSS).
    document.querySelectorAll("#theme-toggle, #theme-toggle-desktop, #theme-toggle-mobile, #dropdown-theme-toggle, .toggle-theme, [data-action='toggle-theme']").forEach(function (btn) {
      if (!btn) return;
      btn.setAttribute("aria-pressed", isDark ? "true" : "false");
      btn.classList.toggle("is-dark", isDark);
      var moon = btn.querySelector(".theme-icon-moon");
      var sun = btn.querySelector(".theme-icon-sun");
      if (moon) {
        moon.removeAttribute("style");
        moon.setAttribute("aria-hidden", isDark ? "true" : "false");
      }
      if (sun) {
        sun.removeAttribute("style");
        sun.setAttribute("aria-hidden", isDark ? "false" : "true");
      }
    });
    var ddBtn = document.getElementById("dropdown-theme-toggle");
    if (ddBtn) ddBtn.setAttribute("aria-pressed", isDark ? "true" : "false");
  }

  var themeInitialized = false;

  function initTheme() {
    if (themeInitialized) return;
    themeInitialized = true;

    var stored = getStoredTheme();
    var configuredMode = (window.aksrtData && window.aksrtData.themeMode) || "light";
    if (stored === "dark" || stored === "light") {
      applyTheme(stored);
    } else {
      applyTheme(resolveConfiguredTheme(configuredMode));
    }

    function prefersReducedMotion() {
      return window.matchMedia && window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    }

    function getThemeTransitionPoint(event) {
      if (event && typeof event.clientX === "number" && typeof event.clientY === "number") {
        return { x: event.clientX, y: event.clientY };
      }
      return { x: window.innerWidth / 2, y: window.innerHeight / 2 };
    }

    function runThemeTransition(next, event) {
      if (!document.startViewTransition || prefersReducedMotion()) {
        applyTheme(next);
        return;
      }

      var point = getThemeTransitionPoint(event);
      var endRadius = Math.hypot(
        Math.max(point.x, window.innerWidth - point.x),
        Math.max(point.y, window.innerHeight - point.y)
      );
      var clipPath = [
        "circle(0px at " + point.x + "px " + point.y + "px)",
        "circle(" + endRadius + "px at " + point.x + "px " + point.y + "px)"
      ];
      var enteringDark = next === "dark";

      try {
        var transition = document.startViewTransition(function () {
          applyTheme(next);
        });

        transition.ready.then(function () {
          try {
            document.documentElement.animate(
              { clipPath: enteringDark ? clipPath : clipPath.slice().reverse() },
              {
                duration: 500,
                easing: enteringDark ? "ease-in" : "ease-out",
                fill: "both",
                pseudoElement: enteringDark ? "::view-transition-new(root)" : "::view-transition-old(root)"
              }
            );
          } catch (e) {}
        }).catch(function () {});
      } catch (e) {
        applyTheme(next);
      }
    }

    function bindToggle(id) {
      var el = document.getElementById(id);
      if (!el) return;
      el.addEventListener("click", function (event) {
        var next = document.body.classList.contains("theme-dark") ? "light" : "dark";
        setStoredTheme(next);
        runThemeTransition(next, event);
      });
    }

    bindToggle("theme-toggle");
    bindToggle("theme-toggle-desktop");
    bindToggle("dropdown-theme-toggle");
    bindToggle("theme-toggle-mobile");
  }

  if (document.readyState === "loading") {
    document.addEventListener("DOMContentLoaded", initTheme);
  } else {
    initTheme();
  }
})();