window.bslst_init = function(){
  //set global configuration variables
  var user_cookie = "client_bslstuid";
  var session_cookie = "client_bslstsid";
  var advertiser_cookie = "client_bslstaid";
  var match_cookie = "client_bslstmatch";
  var session_expire_minutes = 30; 
  var cookie_domain = window.location.hostname.split(/\./).slice(-2).join('.');
  var cookie_secure = ";secure";
  var cookie_samesite = "lax";
  var cookie_separator = "-";
  var user_cookie_prefix = "B";
  var user_expire_days = 540;
  var shop_id_value = "16649";

  //set default new session to false
  window.bslst_session_start = false;
  window.match_event_send = false;

  //support function to retrieve cookie values
  window.bslst_getcookie = function(name) {
      var value = "; " + document.cookie;
      var parts = value.split("; " + name + "=");
      if (parts.length == 2) return parts.pop().split(";").shift();
  }
  //support function to set cookie values according to configuration variables
  window.bslst_setcookie = function(cname, cvalue, exdays, path, domain){
      var d = new Date();
      d.setTime(d.getTime() + (exdays*24*60*60*1000));
      var expires = "expires="+ d.toUTCString();
      document.cookie = cname + "=" + cvalue + ";" + expires + ";path=" + path + ";domain=" + domain +  cookie_secure + ";samesite=" + cookie_samesite;
  }

  //set an bslstsid if none is available
  window.bslst_setbslstsid = function(){
      var session_id = Math.floor(100000000 + Math.random() * 900000000).toString();
      var session_expire = new Date().setTime(new Date().getTime() + (session_expire_minutes*60*1000)).toString();
      var session_cookie_value = session_id + cookie_separator + session_expire;
      var session_expire_days = session_expire_minutes / 60 / 24;
      window.bslst_setcookie(session_cookie, session_cookie_value, session_expire_days, "/", cookie_domain);
      window.bslst_session_start = true;
      return session_id;
  }

  //set an bslstsid if none is available
  window.bslst_setbslstuid = function(){
    var user_id = Math.floor(100000000 + Math.random() * 900000000).toString() + "." + new Date().getTime().toString();
    var user_expire = new Date().setTime(new Date().getTime() + (user_expire_days * 24 * 60 * 60 * 1000)).toString();
    var user_cookie_value = user_cookie_prefix + user_id + cookie_separator + user_expire;
    window.bslst_setcookie(user_cookie, user_cookie_value, user_expire_days, "/", cookie_domain);
    return user_id;
  }


  //check if an bslstuid exists
  window.bslst_checkbslstuid = function(){
    if(window.bslst_getcookie(user_cookie)!==undefined){
        var user_input = window.bslst_getcookie(user_cookie);
        var user_id = user_input.split(cookie_separator)[0];
        var user_expire = parseInt(user_input.split(cookie_separator)[1]);
        //user cookie expired, create new user id
        if(user_expire!==undefined && new Date(user_expire) < new Date()){
            return window.bslst_setbslstuid();
        }
        //user not expired, refresh user expiration time            
        else if (user_expire!==undefined && new Date(user_expire) > new Date()){
            var updated_user_cookie_value = user_id + cookie_separator + new Date().setTime(new Date().getTime() + (user_expire_days*24*60*60*1000)).toString();
            window.bslst_setcookie(user_cookie, updated_user_cookie_value, user_expire_days, "/", cookie_domain);
            return user_id;
        }
        else{
            return window.bslst_setbslstuid();
        }
    }
    else{
        return window.bslst_setbslstuid();
  }
}

  //check if an bslstuid exists
  window.bslst_checkbslstsid = function(){
      if(window.bslst_getcookie(session_cookie)!==undefined){
          var session_input = window.bslst_getcookie(session_cookie);
          var session_id = session_input.split(cookie_separator)[0];
          var session_expire = parseInt(session_input.split(cookie_separator)[1]);
          //session cookie expired, create new session id
          if(session_expire!==undefined && new Date(session_expire) < new Date()){
              return window.bslst_setbslstsid();
          }
          //session not expired, refresh cookie expiration time            
          else if (session_expire!==undefined && new Date(session_expire) > new Date()){
              var updated_session_cookie_value = session_id + cookie_separator + new Date().setTime(new Date().getTime() + (session_expire_minutes*60*1000)).toString();
              window.bslst_setcookie(session_cookie, updated_session_cookie_value, (session_expire_minutes / 60 / 24), "/", cookie_domain);
              return session_id;
          }
          else{
              return window.bslst_setbslstsid();
          }
      }
      else{
          return window.bslst_setbslstsid();
    }
  }
  //this is the event function
  window.bslst_event = function(advertiser_id, event_name, context, ecommerce){
    //get core objects
    var bslst_core_context = context || {};
    var bslst_ecommerce = ecommerce || {};
    var _ga = bslst_getcookie("_ga") || "";
    if(_ga.length > 0){
      bslst_core_context["ga_cid"] = _ga
    }

    //base object to be send with every event
    var default_event_endpoint = "https://ct.beslist.nl/ct_event";
    var event_data = {
        "client_bslst_eid":  bslst_checkbslstsid() + cookie_separator + Math.floor(100000000 + Math.random() * 900000000).toString(),
        "client_bslst_sid": bslst_checkbslstsid(),
        "client_bslst_uid": bslst_checkbslstuid(),
        "client_bslst_aid": advertiser_id,
        "event": event_name || "not_provided",
        "timestamp": new Date().getTime(),
        "screen_height": screen.height || "",
        "screen_width": screen.width || "",
        "user_agent": navigator.userAgent || "",
        "language": navigator.language || "",
        "context": bslst_core_context,
        "location": {
            "referrer": document.referrer,
            "host": window.location.host,
            "path": window.location.pathname,
            "query": window.location.search
        },
        "ecommerce": bslst_ecommerce,
    };
    //adding to location nested object
    var xmlhttp = new XMLHttpRequest();
    xmlhttp.open("POST", default_event_endpoint, true);
    xmlhttp.setRequestHeader("Content-Type", "application/json");
    xmlhttp.send(JSON.stringify(event_data));

    // Update the advertiser cookie
    window.bslst_setcookie(advertiser_cookie, advertiser_id, user_expire_days, "/", cookie_domain);
  }
  // Make a backup for the bslst_advertiser_event
  window.bslst_advertiser_event = window.bslst_event;

  // Helper function to access cookies on the current domain. (Shop domain in this context)
  window.bslst_get_external_cookie = function(name) {
    var value = "; " + document.cookie;
    var parts = value.split("; " + name + "=");

    if (parts.length == 2) {
        return parts.pop().split(";").shift();
    } 
  }

  // The function below is used to send cross site events to the beslist tracking server.
  window.bslst_match_event = function(){
    if(typeof(window.fetch)==="function"){
      // Create the base event object (uid, sid, eid etc. are calculated serverside ).
      var event_data = {
          "client_bslst_eid":  bslst_checkbslstsid() + cookie_separator + Math.floor(100000000 + Math.random() * 900000000).toString(),
          "client_bslst_sid": bslst_checkbslstsid(),
          "client_bslst_uid": bslst_checkbslstuid(),
          "client_bslst_aid": shop_id_value,
          "event": "match_event",
          "timestamp": new Date().getTime(),
          "screen_height": screen.height || "",
          "screen_width": screen.width || "",
          "user_agent": navigator.userAgent || "",
          "language": navigator.language || "",
          "location": {
              "referrer": document.referrer,
              "host": window.location.host,
              "path": window.location.pathname,
              "query": window.location.search
          }
      }

      // Send the event to the tracking server.
      window.fetch("https://ct.beslist.nl/ct_event", {
          method: 'POST',
          credentials: 'include',
          mode: 'no-cors',
          headers: {
            'Content-Type': 'application/json'
          },
          body: JSON.stringify(event_data)
      });
      // After the match event is send, set a match cookie to prevent this event from triggering multiple times per session
      var match_cookie_value = "true" + cookie_separator + new Date().setTime(new Date().getTime() + (session_expire_minutes*60*1000)).toString();
      window.bslst_setcookie(match_cookie, match_cookie_value , (session_expire_minutes / 60 / 24), "/", cookie_domain);
    }
  }

  // check if match cookie is set and not expired
  if(window.bslst_getcookie(match_cookie) !== undefined ){
    var match_cookie_input = window.bslst_getcookie(match_cookie)
    var match_cookie_value = match_cookie_input.split(cookie_separator)[0];
    var match_cookie_expire = parseInt(match_cookie_input.split(cookie_separator)[1]);
    //match cookie not expired, no need for additional match event
    if (match_cookie_expire!==undefined && new Date(match_cookie_expire) > new Date()){
      window.match_event_send = true;
    }
  }
};
window.bslst_init();

// if match cookie is not set, send cookie match event
//(function(){
//  if(window.match_event_send === false){
//    window.bslst_match_event();
//    window.match_event_send = true;
//  }
//})();


//Set the new session recognition logic in a self executing function
(function(){
  // check if the advertiser id is already available in the cookies
  var shop_id_value = "16649";
  var advertiser_id = window.bslst_getcookie("client_bslstaid") || shop_id_value;

  // Keep a list of session start reasons.
  var session_start_reasons = [];

  // check if a session id is already present
  if(window.bslst_session_start === true){
    window.bslst_session_start = false;
    session_start_reasons.push("no session id");
    //console.log("no session id");
  }

  // check if referrer is similar to the hostname 
  if(document.referrer.indexOf(location.protocol + "//" + location.host) === -1  || document.referrer === ""){
    session_start_reasons.push("new referrer");
    //console.log("new referrer");
  }

  // check if utm_* param is present in the search queries
  if(window.location.search.indexOf("utm_") > -1){
    session_start_reasons.push("utm detected");
    //console.log("utm detected");
  }

  // check if trackingparameter is present in search queries
  if(window.location.search.indexOf("clientUuid") > -1){
    session_start_reasons.push("new uuid detected");
    //console.log("new uuid detected");
  }
  // check if trackingparameter is present in search queries
  else if(window.location.search.indexOf("bl3nlclid") > -1){
    session_start_reasons.push("new bl3nlclid detected");
    //console.log("new bl3nlclid detected");
  }

  // If we have a reason for a new session, send the event and the match event.
  if (session_start_reasons.length > 0) {
    window.bslst_match_event();

    window.bslst_event(advertiser_id, "session_start", {
      "shop_session_start_reasons": session_start_reasons.join("|")
    });
  }
})();