/* global clipboard */
/* eslint-disable no-console */
function addCopyButtons(clipboard) {
    document.querySelectorAll('pre > code').forEach(function (codeBlock) {
        var button = document.createElement('button');
        button.className = 'copy-code-button';
        button.type = 'button';
        button.innerText = 'Copy';
        button.addEventListener('click', function () {
            clipboard.writeText(codeBlock.innerText).then(function () {
                /* Chrome doesn't seem to blur automatically,
                   leaving the button in a focused state. */
                button.blur();
                button.innerText = 'Copied!';
                setTimeout(function () {
                    button.innerText = 'Copy';
                }, 2000);
            }, function (error) {
                button.innerText = 'Error';
            });
        });
        var pre = codeBlock.parentNode;
        if (pre.parentNode.classList.contains('highlight')) {
            var highlight = pre.parentNode;
            highlight.parentNode.insertBefore(button, highlight);
        } else {
            pre.parentNode.insertBefore(button, pre);
        }
    });
}
if (navigator && navigator.clipboard) {
    addCopyButtons(navigator.clipboard);
} else {
    var script = document.createElement('script');
    script.src =
        'https://cdnjs.cloudflare.com/ajax/libs/clipboard-polyfill/2.7.0/clipboard-polyfill.promise.js';
    script.integrity = 'sha256-waClS2re9NUbXRsryKoof+F9qc1gjjIhc2eT7ZbIv94=';
    script.crossOrigin = 'anonymous';
    script.onload = function () {
        addCopyButtons(clipboard);
    };
    document.body.appendChild(script);
}