(function () {
  var buttons = document.querySelectorAll("[data-share-page]");
  if (!buttons.length) return;

  var RESET_MS = 2000;

  function fallbackCopy(text) {
    var ta = document.createElement("textarea");
    ta.value = text;
    ta.setAttribute("readonly", "");
    ta.style.cssText = "position:fixed;top:0;left:0;width:1px;height:1px;padding:0;border:0;opacity:0;";
    document.body.appendChild(ta);
    ta.focus();
    ta.select();
    ta.setSelectionRange(0, ta.value.length);
    var ok = false;
    try {
      ok = document.execCommand("copy");
    } catch (_) {
      ok = false;
    }
    document.body.removeChild(ta);
    return ok;
  }

  function copyText(text) {
    if (navigator.clipboard && navigator.clipboard.writeText) {
      return navigator.clipboard.writeText(text).catch(function () {
        fallbackCopy(text);
      });
    }
    fallbackCopy(text);
    return Promise.resolve();
  }

  function showCopied(btn, label, original) {
    if (label) {
      label.textContent = "链接已复制";
      label.classList.add("is-copied");
    }
    btn.classList.add("is-share-copied");
    btn.setAttribute("aria-label", "链接已复制");
    if (typeof window.showToast === "function") {
      window.showToast("链接已复制", "success");
    }
    if (btn._shareResetTimer) window.clearTimeout(btn._shareResetTimer);
    btn._shareResetTimer = window.setTimeout(function () {
      if (label) {
        label.textContent = original;
        label.classList.remove("is-copied");
      }
      btn.classList.remove("is-share-copied");
      btn.setAttribute("aria-label", original || "分享");
      btn._shareResetTimer = 0;
    }, RESET_MS);
  }

  Array.prototype.forEach.call(buttons, function (btn) {
    var label = btn.querySelector("[data-share-page-label]");
    var original = (label && label.textContent) || btn.getAttribute("aria-label") || "分享";
    btn.addEventListener("click", function (event) {
      event.preventDefault();
      showCopied(btn, label, original);
      copyText(window.location.href);
    });
  });
})();