function escapeHTML(source) {
  return source.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/[\r\n]/g, "<br/>");
}

function decodeHTML(html) {
  var txt = document.createElement("textarea");
  txt.innerHTML = html;
  return txt.value;
}

var tabs = [
  {
    name: "GNU/Linux",
    command: "curl -fsSL https://downloads.svrjs.org/installer/svr.js.installer.linux.20240405.sh > /tmp/installer.sh && sudo bash /tmp/installer.sh",
    uaRegex: /\b(?:GNU\/)?Linux\b/gi
  }
];

if (tabs.length > 0) {
  var otherTab = document.getElementById("command-tab-other");
  var otherTabOuterHTML = otherTab.outerHTML;
  var tabsHTML = "";
  var tabToClick = tabs.length;
  for (var i = 0; i <= tabs.length; i++) {
    tabsHTML += "<span class=\"command-tab\" id=\"command-tab-" + i + "\">";
    if (i == tabs.length) {
      tabsHTML += "Manually";
    } else {
      tabsHTML += escapeHTML(tabs[i].name);
    }
    tabsHTML += "</span>";
    if (tabToClick == tabs.length && i != tabs.length && navigator.userAgent.match(tabs[i].uaRegex)) tabToClick = i;
  }
  otherTab.outerHTML = "<div id=\"command-tab-tabcontainer\">" + tabsHTML + "</div><div id=\"command-tab-container\"></div>";
  var tabContainer = document.getElementById("command-tab-container");
  for (var i = 0; i <= tabs.length; i++) {
    document.getElementById("command-tab-" + i).onclick = createTabClickHandler(i);
  }

  function copyHandler() {
    if (navigator.clipboard) {
      navigator.clipboard.writeText(decodeHTML(document.getElementById("command-tab-command").innerHTML));
    } else {
      if (document.selection) {
        var range = document.body.createTextRange();
        range.moveToElementText(document.getElementById("command-tab-command"));
        range.select();
      } else if (window.getSelection) {
        var range = document.createRange();
        range.selectNode(document.getElementById("command-tab-command"));
        window.getSelection().removeAllRanges();
        window.getSelection().addRange(range);
      }

      document.execCommand("copy");

      if (document.selection) {
        document.selection.empty();
      } else if (window.getSelection) {
        window.getSelection().removeAllRanges();
      }
    }
    document.getElementById("command-tab-copy").innerHTML = "Copied!";
  }

  function createTabClickHandler(i) {
    return function () {
      for (var j = 0; j <= tabs.length; j++) {
        document.getElementById("command-tab-" + j).className = "command-tab";
      }
      document.getElementById("command-tab-" + i).className = "command-tab command-tab-selected";
      var container = document.getElementById("command-tab-container");
      if (i == tabs.length) {
        container.innerHTML = otherTabOuterHTML;
      } else {
        container.innerHTML = "<div id=\"command-tab-h\">Install SVR.JS</div><div id=\"command-tab-copy\">Copy</div><code id=\"command-tab-command\" translate=\"no\">" + escapeHTML(tabs[i].command) + "</code><div class=\"command-tab-clearfix\"></div>";
        document.getElementById("command-tab-copy").onclick = copyHandler;
      }
    }
  }
  document.getElementById("command-tab-" + tabToClick).click();
}