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import com.atlassian.jira.component.ComponentAccessor;
import com.atlassian.jira.security.groups.GroupManager;
import com.atlassian.jira.issue.IssueInputParameters;
import com.atlassian.jira.bc.issue.IssueService;
import com.atlassian.jira.bc.issue.DefaultIssueService;
import com.atlassian.jira.bc.issue.worklog.WorklogInputParametersImpl.Builder;
import com.atlassian.jira.issue.IssueManager;
import com.atlassian.jira.issue.IssueInputParameters;
import com.atlassian.jira.security.*;
import org.slf4j.*;

Logger log = LoggerFactory.getLogger(com.deniz.jira.worklog.scripting.ScriptingService.class);
log.debug('!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!');

def issueManager = ComponentAccessor.getIssueManager();
def issueService = ComponentAccessor.getIssueService();
def authenticationContext = ComponentAccessor.getJiraAuthenticationContext();
def customFieldManager = ComponentAccessor.getCustomFieldManager();

def currentUser = authenticationContext.getLoggedInUser();
def issue=worklogResult.getWorklog().getIssue();
def epicLinkCf = customFieldManager.getCustomFieldObjectByName("Epic Link");
def epicIssue = issue.getCustomFieldValue(epicLinkCf);

def parentObject=issue.getParentObject();
 if(parentObject){
  def epicIssueOfObject=parentObject.getCustomFieldValue(epicLinkCf);
   if(epicIssueOfObject){
    //In this case,epic has a child issue and child issue has a subtask.Worklog is done for this subtask.
   epicIssue = epicIssueOfObject;
   }
   if(parentObject.issueType.name == 'Epic'){
    //In this case,epic has a subtask.Worklog is done for this subtask.
    epicIssue=parentObject;
    log.debug("EPIC ISSUE IS PARENT OBJECT:{}", epicIssue);
   }
  }

if (epicIssue!=null){
    log.debug("EPIC ISSUE:{}", epicIssue);
    def issueSpentTime=worklog.getTimeSpent();
   if (epicIssue){log.debug("TIME SPENT:{}", issueSpentTime);
    def epicEstimate=epicIssue.getEstimate();
    log.debug("EPIC ESTIMATE:{}", epicEstimate);
    if(epicEstimate!=null){
       //Since this script runs before worklog deletion process,issueSpentTime is added twice to remaining estimate,so the number issueSpentTime is divided by 2 in calculating 'epicEstimateUpdated'
    Long epicEstimateUpdated=epicEstimate+(issueSpentTime/2);
    log.debug("EPIC ESTIMATE UPDATED:{}", epicEstimateUpdated);
    IssueInputParameters issueInputParameters = issueService.newIssueInputParameters();
    issueInputParameters.setRemainingEstimate((epicEstimateUpdated/60) + "m");
    
    IssueService.UpdateValidationResult updateValidationResult = issueService.validateUpdate(currentUser, epicIssue.getId(), issueInputParameters);
    if(updateValidationResult.isValid()){
        issueService.update(currentUser, updateValidationResult);
    }else{
        log.error("!!!Error in Worklog Update Script:{}", getErrorCollection.getErrorCollection())
    }
    }
  }  
  return null;