How to change the status of an epic when the stories chnge their status

[Marcos Fernando Simon]

I'm trying to run a script listener that updates the status of the epic (not the EpicStatus custom field) when one of the stories change its status.
The case is I don't know which event should I listen. I tried to use a generic event, but I can't figure out how to get its name and if I don't set any condition the event name, it runs a lot of times and breaks. How do I get the name of a generic event?
PS: I'm not sure my script works too.
PSS: Here's my script. I've found it on the internet and adapted for my needs.

import com.atlassian.jira.component.ComponentAccessor;
import com.atlassian.jira.issue.IssueManager;
import com.atlassian.jira.issue.Issue;
import com.atlassian.jira.issue.link.IssueLinkManager;
import com.atlassian.jira.issue.link.IssueLink;
import com.atlassian.jira.issue.ModifiedValue;
import com.atlassian.jira.issue.util.DefaultIssueChangeHolder;
import com.atlassian.jira.issue.customfields.option.Options;
import com.atlassian.jira.issue.customfields.option.Option;
import com.atlassian.jira.issue.fields.config.FieldConfig;
import com.atlassian.jira.issue.customfields.manager.OptionsManager;
import com.atlassian.jira.ComponentManager;
import com.atlassian.jira.bc.issue.IssueService.TransitionValidationResult;
import com.atlassian.jira.bc.issue.IssueService;
import com.atlassian.jira.issue.IssueInputParameters;
import com.atlassian.jira.user.ApplicationUser;
import com.opensymphony.workflow.loader.ActionDescriptor;
import com.atlassian.jira.workflow.JiraWorkflow;
import com.atlassian.jira.workflow.WorkflowManager;

ComponentManager componentManager = ComponentManager.getInstance();
def groupMan = ComponentAccessor.getGroupManager()
def authCon = ComponentAccessor.getJiraAuthenticationContext()
def customFieldManager = ComponentAccessor.getCustomFieldManager()
def changeHolder = new DefaultIssueChangeHolder();
IssueManager issueManager = ComponentAccessor.getIssueManager();
OptionsManager optionsManager = componentManager.getComponentInstanceOfType(OptionsManager.class);
IssueLinkManager issueLinkManager = ComponentAccessor.getIssueLinkManager()
String currentEpicStatus = "";

def curUser = authCon.getLoggedInUser()
def issue = event.issue

//this was a try of getting the name of the generic event, but it show the class name
/*
if (event == "In Progress (21)") {
log.warn "In Progress (21)"
} else {
log.warn event.toString()
}
*/

def epicLinkCf = customFieldManager.getCustomFieldObjects(issue).find {it.name == 'Epic Link'}
if(!epicLinkCf) {log.warn "No Epic Link field"; return}
log.warn "Existing Epic Link: ${epicLinkCf.getValue(issue)}"

String epicIssue = epicLinkCf.getValue(issue)
Issue epic = issueManager.getIssueObject(epicIssue) // epicKey is passed into your script

// Check if Epic link is exist
if(!epic)
return true

def newEpicState = "Done"

log.warn "Epic: " + epic
List<IssueLink> allOutIssueLink = issueLinkManager.getOutwardLinks(epic.getId());
for (Iterator<IssueLink> outIterator = allOutIssueLink.iterator(); outIterator.hasNext();) {
IssueLink issueLink = (IssueLink) outIterator.next();
log.warn "child link type: " + issueLink.getIssueLinkType().getName()
Issue chIssue = issueLink.getDestinationObject();
// Check status of all issues from epic
if (issueLink.getIssueLinkType().getName() == "Epic-Story Link") {
log.warn "child state: " + chIssue.getStatus().getName()
if(chIssue.getStatus().getName() == "In Progress") {
newEpicState = "In Progress"
} else if (chIssue.getStatus().getName() != "Closed" && newEpicState != "In Progress") {
newEpicState = "To Do"
}
} else if (issueLink.getIssueLinkType().getName() == "Epic Link") {
currentEpicStatus = chIssue.getStatus().getName();
}
}

log.warn "Current epic status: " + currentEpicStatus

log.warn "New epic status: " + newEpicState

// Set new status if it necessary
if (currentEpicStatus != newEpicState) {

WorkflowManager workflowManager = ComponentAccessor.getWorkflowManager();
JiraWorkflow jiraWorkflow = workflowManager.getWorkflow(issue);
Collection<ActionDescriptor> cActionDesc = jiraWorkflow.getAllActions();
int actionId = 0;

for (ActionDescriptor res : cActionDesc) {
if (res.getName().equals(newEpicState)) {
actionId = res.getId();
break;
}
}

IssueService issueService = ComponentAccessor.getIssueService();
IssueService.IssueResult transResult;

IssueInputParameters issueInputParameters = issueService.newIssueInputParameters();
//issueInputParameters.setStatusId(newEpicState);

TransitionValidationResult validationResult = issueService.validateTransition(curUser, issue.getId(), actionId, issueInputParameters);

if (validationResult.isValid()) {
transResult = issueService.transition(curUser, validationResult);
}

log.warn "Epic status is updated!"
}

[Craig Nodwell]

Ouch this script isn't going to work too big too complicated for such a small task.  Did you get this working?  If not please ping me back and I'll assist