/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

/* globals catcher, assertIsBlankDocument, browser */

"use strict";

this.clipboard = (function () {
  const exports = {};

  exports.copy = function (text) {
    return new Promise(resolve => {
      const element = document.createElement("iframe");
      element.src = browser.runtime.getURL("blank.html");
      // We can't actually hide the iframe while copying, but we can make
      // it close to invisible:
      element.style.opacity = "0";
      element.style.width = "1px";
      element.style.height = "1px";
      element.style.display = "block";
      element.addEventListener(
        "load",
        catcher.watchFunction(() => {
          try {
            const doc = element.contentDocument;
            assertIsBlankDocument(doc);
            const el = doc.createElement("textarea");
            doc.body.appendChild(el);
            el.value = text;
            if (!text) {
              const exc = new Error("Clipboard copy given empty text");
              exc.noPopup = true;
              catcher.unhandled(exc);
            }
            el.select();
            if (doc.activeElement !== el) {
              const unhandledTag = doc.activeElement
                ? doc.activeElement.tagName
                : "No active element";
              const exc = new Error("Clipboard el.select failed");
              exc.activeElement = unhandledTag;
              exc.noPopup = true;
              catcher.unhandled(exc);
            }
            const copied = doc.execCommand("copy");
            if (!copied) {
              catcher.unhandled(new Error("Clipboard copy failed"));
            }
            el.remove();
            resolve(copied);
          } finally {
            element.remove();
          }
        }),
        { once: true }
      );
      document.body.appendChild(element);
    });
  };

  return exports;
})();
null;
