Page Comparison

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.IssueManager
import com.atlassian.jira.issue.Issue
import com.atlassian.jira.issue.MutableIssue
import com.atlassian.jira.bc.issue.properties.IssuePropertyService
import com.atlassian.jira.event.type.EventDispatchOption
import com.atlassian.jira.user.ApplicationUser
import com.atlassian.jira.entity.property.EntityPropertyService
import org.apache.commons.lang3.StringUtils

////If used in a transition, comment next line:
Issue issue = ComponentAccessor.getIssueManager().getIssueObject("ISSUE-1")
String formName = "Form Name"
def fieldNames = ["Field One", "Field Two"]
def fieldDestination = "Destination Field"
ApplicationUser loggedInUser = ComponentAccessor.jiraAuthenticationContext.getLoggedInUser()
IssuePropertyService issuePropertyService = ComponentAccessor.getComponentOfType(IssuePropertyService.class)
IssueManager issueManager = ComponentAccessor.getIssueManager()

Closure getFormIds = { def property, String name ->
	def slurper = new groovy.json.JsonSlurper()
    def parsedJson = slurper.parseText(property.value)
    def ids = []
    parsedJson.forms.each(){ form ->
        String id
        if(form.name.equals(name)){
            id = form.id.toString()
        }
        if(id){
            ids.add(Long.valueOf(id))
        }
    }
    return ids
}

Closure<String> getFieldId = { def property, String fieldName ->
    def slurper = new groovy.json.JsonSlurper()
    def parsedJson = slurper.parseText(property.value)
    for (def question : parsedJson.design.questions){
        if(fieldName.equals(question.value.label)){
            return question.key.toString()
        }
    }
}

Closure<String> getFieldValue = { def property, String fieldName ->
    def slurper = new groovy.json.JsonSlurper()
    def parsedJson = slurper.parseText(property.value)
    for (def answer : parsedJson.state.answers){
        String fieldId = getFieldId(property, fieldName)
        if(fieldId.equals(answer.key)){
            return answer.value.text.toString()
        }
    }
}

def allProperties = issuePropertyService.getProperties(loggedInUser, issue.id)
def forms = []
for(def property : allProperties){
    if(property.key.equals("proforma.forms")){
   		forms = getFormIds(property, formName)
    }
}

for (def formId : forms){
    Double result = 0
    for(def property : allProperties){
        if(property.key.equals("proforma.forms" + ".i" + formId) && property.value.contains("\"schemaVersion\":8")){
            for(def fieldName : fieldNames) {
                if(getFieldValue(property, fieldName)){
                    result = result + getFieldValue(property, fieldName).toDouble()
                }
            }
        }
    }

    for(def property : allProperties){
        if(property.key.equals("proforma.forms" + ".i" + formId) && property.value.contains("\"schemaVersion\":8")){
            String toReplace = "\"" + getFieldId(property, fieldDestination) + "\":{\"text\":\"" + getFieldValue(property, fieldDestination) + "\"}"
            String replacement = "\"" + getFieldId(property, fieldDestination) + "\":{\"text\":\"" + result.toString() + "\"}"
            if(!toReplace.contains("null")){
                EntityPropertyService.SetPropertyValidationResult validationResult =
                    issuePropertyService.validateSetProperty(
                        loggedInUser,
                        issue.id,
                          new EntityPropertyService.PropertyInput(property.value.replace(toReplace, replacement), property.key))
                if(validationResult.isValid()){
                    issuePropertyService.setProperty(loggedInUser, validationResult)
                }
            } else {
                EntityPropertyService.SetPropertyValidationResult validationResult =
                    issuePropertyService.validateSetProperty(
                        loggedInUser,
                        issue.id,
                          new EntityPropertyService.PropertyInput(property.value.replace("\"answers\":{", "\"answers\":{" + replacement + ", "), property.key))
                if(validationResult.isValid()){
                    issuePropertyService.setProperty(loggedInUser, validationResult)
                }
            }
        }
    }
}