dynamics promise

function getUsersFromBisunessUnit(roleName, businessunitid) { //funkcja pobiera użytkowników z danej jednostki biznesowej
  const fetchXml = `<fetch><entity name='systemuserroles' ><attribute name='systemuserid' /><link-entity name='role' from='roleid' to='roleid' ><filter><condition attribute='name' operator='eq' value='${roleName}' /></filter></link-entity><link-entity name='systemuser' from='systemuserid' to='systemuserid' ><filter><condition attribute='businessunitid' operator='eq' value='${businessunitid}' /></filter></link-entity></entity></fetch>`;

  return Xrm.WebApi.retrieveMultipleRecords('systemuserrolescollection', `?fetchXml=${fetchXml}`).then(
    result => {
      if (result.entities.length == 0)
        return [] //brak użytkowników
      else
        return result.entities.map(el => el.systemuserid)
    },
    error => {
      console.error(`Wystąpił błąd: ${error.message}`);
      return false
    }
  ) //On success, returns a promise
}

function addLookup(field, array = []) { //filtrowanie lookupa zadaną tablicą użytkowników
  let filter;

  if (!array.length)
    filter = "<filter><condition attribute='systemuserid' operator='eq' value='00000000-0000-0000-0000-000000000000' /></filter>";
  else
    filter = `<filter><condition attribute='systemuserid' operator='in' >${array.map(el => `<value>${el}</value>`).join("")}</condition></filter>`;

  Xrm.Page.getControl(field).addPreSearch(
    () => Xrm.Page.getControl(field).addCustomFilter(filter)
  );
}

function lookup() {
  const fetchXml = `<fetch><entity name='businessunit' ><attribute name='parentbusinessunitid' alias='parentBu' /><attribute name='businessunitid' alias='bu' /><filter><condition attribute='businessunitid' operator='eq-businessid' /></filter><link-entity name='businessunit' from='businessunitid' to='parentbusinessunitid' link-type='outer' ><attribute name='parentbusinessunitid' alias='nextParentBu' /></link-entity></entity></fetch>`;
  const roleName = "Kierownik";

  Xrm.WebApi.retrieveMultipleRecords('businessunit', `?fetchXml=${fetchXml}`).then(
    result => {
      let [bu, parentbu, nextparentbu] = [result.entities[0].businessunitid, result.entities[0].parentBu, result.entities[0].nextParentBu];

      getUsersFromBisunessUnit(roleName, bu).then(
        result => {
          if (result.length != 0)
            addLookup("kierownik", result)
          else {
            if (parentBu !== undefined) {
              getUsersFromBisunessUnit(roleName, parentbu).then(
                result => {
                  if (result.length != 0)
                    addLookup("kierownik", result)
                  else {
                    if (nextparentbu !== undefined) {
                      getUsersFromBisunessUnit(roleName, parentbu).then(
                        result => {
                          if (result.length != 0)
                            addLookup("kierownik", result)
                          else
                            addLookup("kierownik")
                        },
                        error => addLookup("kierownik")
                      )
                    } else
                      addLookup("kierownik")
                  }
                },
                error => addLookup("kierownik")
              )
            } else
              addLookup("kierownik")
          }
        },
        error => addLookup("kierownik")
      )
    }
  );
}