/* 霜曜 / 黑金主题：仅记忆主题偏好，不写任何业务数据。 */
(function (global) {
  var KEY = "jinniu-theme";

  function read() {
    try {
      return localStorage.getItem(KEY) === "night" ? "night" : "day";
    } catch (err) {
      return "day";
    }
  }

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

  function apply(theme, animate) {
    var next = theme === "night" ? "night" : "day";
    var root = document.documentElement;
    root.classList.add("v-fusion");
    if (animate) {
      root.setAttribute("data-theme-anim", "");
      window.setTimeout(function () {
        root.removeAttribute("data-theme-anim");
      }, 220);
    }
    root.setAttribute("data-theme", next);
    if (document.body) document.body.setAttribute("data-theme", next);
    syncButtons(next);
  }

  function set(theme) {
    var next = theme === "night" ? "night" : "day";
    try {
      localStorage.setItem(KEY, next);
    } catch (err) {
      /* 无本地存储时仍切换当次会话 */
    }
    apply(next, true);
  }

  apply(read(), false);
  document.addEventListener("click", function (event) {
    var btn = event.target.closest("[data-theme-set]");
    if (!btn) return;
    event.preventDefault();
    set(btn.getAttribute("data-theme-set"));
  });

  global.JinniuTheme = { apply: apply, set: set, read: read };
})(window);