(function () {
  "use strict";

  function fallbackCopy(value) {
    var input = document.createElement("textarea");
    input.value = value;
    input.setAttribute("readonly", "");
    input.style.position = "fixed";
    input.style.opacity = "0";
    document.body.appendChild(input);
    input.select();
    var copied = document.execCommand("copy");
    input.remove();
    return copied;
  }

  function copyValue(value) {
    if (navigator.clipboard && window.isSecureContext) {
      return navigator.clipboard.writeText(value);
    }
    return fallbackCopy(value) ? Promise.resolve() : Promise.reject(new Error("copy failed"));
  }

  document.addEventListener("click", function (event) {
    var button = event.target.closest("[data-copy-value]");
    if (!button) return;
    var value = button.getAttribute("data-copy-value") || window.location.href;
    var original = button.textContent;
    copyValue(value).then(function () {
      button.textContent = "已复制";
      window.setTimeout(function () { button.textContent = original; }, 1600);
    }).catch(function () {
      button.textContent = "复制失败";
      window.setTimeout(function () { button.textContent = original; }, 1600);
    });
  });
})();