public with sharing class LightningUtility {
    public static List<Schema.FieldSetMember> getFieldSetFields(String ObjectApiName,String fieldSetName) {
      return Schema.getGlobalDescribe().get(ObjectApiName).getDescribe().FieldSets.getMap().get(fieldSetName).getFields();
    }
    public static Boolean isCustomField(String ObjectApiName, String fieldApiName) {
      return Schema.getGlobalDescribe().get(ObjectApiName).getDescribe().fields.getMap().get(fieldApiName).getDescribe().isCustom();
    }
    public static String getFieldApiNames4QueryString(List<Schema.FieldSetMember> oppFields, String objectApiName) {
      String fieldsSel = '';
      for(Schema.FieldSetMember fsm : oppFields) {
        if(String.isBlank(fieldsSel)) {
          if(String.valueOf(fsm.getType()) == 'REFERENCE') {
            String str = fsm.getFieldPath();
            if(isCustomField(objectApiName,fsm.getFieldPath())) {
              fieldsSel = str+','+str.left(str.length()-1)+'r.Name';
            }
            else {
              fieldsSel = str+','+str.left(str.length()-2)+'.Name';
            }
          }
          else {
            fieldsSel = fsm.getFieldPath();
          }
        }
        else {
          if(String.valueOf(fsm.getType()) == 'REFERENCE') {
            String str = fsm.getFieldPath();
            if(isCustomField(objectApiName,fsm.getFieldPath())) {
              fieldsSel += ','+str+','+str.left(str.length()-1)+'r.Name';
            }
            else {
              fieldsSel += ','+str+','+str.left(str.length()-2)+'.Name';
            }
          }
          else {
            fieldsSel += ','+fsm.getFieldPath();
          }
        }
      }
      return fieldsSel;
    }
    public static List<String> getFieldApisLstOfFieldSet(List<Schema.FieldSetMember> oppFields) {
      List<String> fieldApiNames = new List<String>();
      for(Schema.FieldSetMember fsm : oppFields) {
        fieldApiNames.add(fsm.getFieldPath());
      }
      return fieldApiNames;
    }
    public static List<KayAndValue> getFieldApisAndDTyesLstOfFieldSet(List<Schema.FieldSetMember> oppFields, String objectApi) {
      List<KayAndValue> fieldApiDataTypes = new List<KayAndValue>();
      for(Schema.FieldSetMember fsm : oppFields) {
        KayAndValue kv = new KayAndValue(fsm.getFieldPath(),String.valueOf(fsm.getType()),isCustomField(objectApi,fsm.getFieldPath()));
        fieldApiDataTypes.add(kv);
      }
      return fieldApiDataTypes;
    }
    public static List<String> getFieldLabelsLstOfFieldSet(List<Schema.FieldSetMember> oppFields, String objectApiName) {
      List<String> fieldLabelNames = new List<String>();
      for(Schema.FieldSetMember fsm : oppFields) {
        if(String.valueOf(fsm.getType()) == 'REFERENCE' && !isCustomField(objectApiName,fsm.getFieldPath())) {
          fieldLabelNames.add(fsm.getLabel().left(fsm.getLabel().length()-2)+' Name');
        }
        else if(String.valueOf(fsm.getType()) == 'ID') {
          fieldLabelNames.add('Actions');
        }
        else {
          fieldLabelNames.add(fsm.getLabel());
        }
      }
      return fieldLabelNames;
    }
    public static String getQueryString(String objectApiName, String selFieldsString, String limitSize, String offsetSize) {
      system.debug('@@limitSize: '+limitSize);
      String limitSizeStr;
      if(limitSize == null) {
        limitSizeStr = String.valueOf(Limits.getLimitQueryRows());
      }
      else {
        limitSizeStr = limitSize;
      }
      system.debug('limitSizeStr: '+limitSizeStr);
      String finalOffset = '';
      if(String.isNotBlank(offsetSize)) {
        finalOffset = ' offset '+offsetSize;
      }
      return 'select '+selFieldsString+' from '+objectApiName + ' Limit '+limitSizeStr+finalOffset;
    }

    public class KayAndValue {
      @AuraEnabled
      public String fieldDataType;
      @AuraEnabled
      public String fieldApiName;
      @AuraEnabled
      public Boolean isCustom;
      public KayAndValue(String fieldApiName, String fieldDataType, Boolean isCustom) {
        this.fieldApiName = fieldApiName;
        this.fieldDataType = fieldDataType;
        this.isCustom = isCustom;
      }
    }
}