import com.atlassian.jira.component.ComponentAccessor;
import com.atlassian.jira.issue.CustomFieldManager;
import com.atlassian.jira.issue.Issue;
import com.atlassian.jira.issue.fields.CustomField;
import com.atlassian.greenhopper.service.rapid.view.RapidViewService
import com.atlassian.greenhopper.service.sprint.SprintIssueService
import com.atlassian.greenhopper.service.sprint.SprintManager
import com.atlassian.greenhopper.service.sprint.SprintService
import org.apache.log4j.Logger
import org.apache.log4j.Level
 
def log = Logger.getLogger("com.knowit.UpdateIssueStatusWithSprint");
log.setLevel(Level.DEBUG);

def user = ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser()
def workflowManager = ComponentAccessor.getWorkflowManager();
def issueService = ComponentAccessor.getIssueService()
def customFieldManager = ComponentAccessor.getCustomFieldManager();

def sprintField = customFieldManager.getCustomFieldObjectByName("Sprint");
def sprints = event.issue.getCustomFieldValue(sprintField);   
def workflow = workflowManager.getWorkflow(event.issue);
def status = event.issue.getStatus().getName();
def availableActions = workflow.getAllActions();
    
log.info("Issue has status '" + status + "'");

if (sprints != null) {
    log.info("Issue added to sprint: " + event.issue);
    
    if (status == "Backlog") {
    	log.info("Trying to find 'Select for Development' action to progress task");
        
        def actionId = -1;
        
        // Find the "Select for development" action
        for (def actionDescriptor : availableActions) {
            if (actionDescriptor.getName().equals("Select for Development")) {
                actionId = actionDescriptor.getId();
            }
        }
        
        if (actionId > -1) {
            def validationResult = issueService.validateTransition(user, event.issue.id, actionId, issueService.newIssueInputParameters());
            
            if (validationResult.isValid()) {
                log.info("Issue can be changed with action " + actionId);
				
		def transitionResult = issueService.transition(user, validationResult);

		if (transitionResult.isValid()) {
			log.info("Successfully transitioned issue");
		}
		else {
			log.error("Error when transitioning issue");
		}
            }
            else {
		log.error("Issue cannot be changed with action " + actionId);
		log.error(validationResult.errorCollection);
            }
        }
        else {
            log.info("Could not find 'Select for Development' action")
        }
    }
}
else {
    log.info("Issue removed from sprint: " + event.issue);
	
	if (status == "Selected for Development" || status == "In Progress" ) {
    	log.info("Trying to find 'Move to Backlog' action to progress task");
        
        def actionId = -1;
        
        // Find the "Move to Backlog" action
        for (def actionDescriptor : availableActions) {
            if (actionDescriptor.getName().equals("Move to Backlog")) {
                actionId = actionDescriptor.getId();
            }
        }
        
        if (actionId > -1) {
            def validationResult = issueService.validateTransition(user, event.issue.id, actionId, issueService.newIssueInputParameters());
            
            if (validationResult.isValid()) {
                log.info("Issue can be changed with action " + actionId);
				
		def transitionResult = issueService.transition(user, validationResult);

		if (transitionResult.isValid()) {
			log.info("Successfully transitioned issue");
		}
		else {
			log.error("Error when transitioning issue");
		}
            }
            else {
		log.error("Issue cannot be changed with action " + actionId);
		log.error(validationResult.errorCollection);
            }
        }
        else {
            log.info("Could not find 'Move to Backlog' action")
        }
    }
}