// Taken from https://github.com/PiwikPRO/react-piwik-pro/blob/master/src/core/index.ts
export default function initializeDatalayer(
  siteId: string,
  containerUrl: string | undefined = 'https://dap.amsterdam.nl',
  nonce?: string,
) {
  if (!siteId) {
    throw new Error('Empty tracking code for Piwik Pro.')
  }

  if (!document) {
    console.error(
      'Was not possible to access Document interface. Make sure this module is running on a Browser w/ access do Document interface.',
    )
  }

  const s: HTMLScriptElement = document.createElement('script')
  s.async = false
  if (nonce) {
    s.setAttribute('nonce', nonce)
  }
  s.text = `(function(window, document, dataLayerName, id) {
    window[dataLayerName]=window[dataLayerName]||[],window[dataLayerName].push({start:(new Date).getTime(),event:"stg.start"});var scripts=document.getElementsByTagName('script')[0],tags=document.createElement('script');
    function stgCreateCookie(a,b,c){var d="";if(c){var e=new Date;e.setTime(e.getTime()+24*c*60*60*1e3),d="; expires="+e.toUTCString()}document.cookie=a+"="+b+d+"; path=/"}
    var isStgDebug=(window.location.href.match("stg_debug")||document.cookie.match("stg_debug"))&&!window.location.href.match("stg_disable_debug");stgCreateCookie("stg_debug",isStgDebug?1:"",isStgDebug?14:-1);
    var qP=[];dataLayerName!=="dataLayer"&&qP.push("data_layer_name="+dataLayerName),isStgDebug&&qP.push("stg_debug");var qPString=qP.length>0?("?"+qP.join("&")):"";
    tags.async=!0,tags.src="${containerUrl}/containers/"+id+".js"+qPString,scripts.parentNode.insertBefore(tags,scripts);
    !function(a,n,i){a[n]=a[n]||{};for(var c=0;c<i.length;c++)!function(i){a[n][i]=a[n][i]||{},a[n][i].api=a[n][i].api||function(){var a=[].slice.call(arguments,0);"string"==typeof a[0]&&window[dataLayerName].push({event:n+"."+i+":"+a[0],parameters:[].slice.call(arguments,1)})}}(i[c])}(window,"ppms",["tm","cm"]);
    })(window, document, 'dataLayer', '${siteId}')`

  const head: HTMLHeadElement = document.getElementsByTagName('body')[0]
  head.appendChild(s)
}