function uuidv4() {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  });
}

function setAntiFraudHeaders() {
    var hmrcGuid = localStorage.getItem('hmrc-guid');
    if(hmrcGuid == null){
        hmrcGuid = uuidv4();
        localStorage.setItem('hmrc-guid', hmrcGuid);
    }

    let antifraudHeaders = {}
    antifraudHeaders["Gov-Client-Device-ID"] = hmrcGuid

    var plugins = [];
    for (i = 0; i < navigator.plugins.length; i++) {
      plugins.push(encodeURIComponent(navigator.plugins[i].name))
    }
    antifraudHeaders["plugins"] = plugins.join(',')

    antifraudHeaders["utcOffset"] = new Date().getTimezoneOffset();

    antifraudHeaders["screenWidth"] = screen.width
    antifraudHeaders["screenHeight"] = screen.height
    antifraudHeaders["colorDepth"] = screen.colorDepth
    antifraudHeaders["devicePixelRatio"] = window.devicePixelRatio

    antifraudHeaders["windowWidth"] = window.innerWidth
    antifraudHeaders["windowHeight"] = window.innerHeight

    antifraudHeaders["userAgent"] = window.navigator.userAgent
    antifraudHeaders["dnt"] = window.navigator.doNotTrack

    antifraudHeaders["trikiMtdVersion"] = 'triki-mtd=1.0.33'

    if(document.getElementById('hmrcHeaders') != null) {
        document.getElementById('hmrcHeaders').value = JSON.stringify(antifraudHeaders)
    }
}