Automate record creation || Apex Specialist

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[@VISHALKUMAR-qy3mb]

Bro how to find " How to roll Maintaince"

[@Solo-Tech-World10001]

MaintenanceRequestHelper :
public with sharing class MaintenanceRequestHelper {
public static void updateworkOrders(List updWorkOrders, Map nonUpdCaseMap) {
Set validIds = new Set();


For (Case c : updWorkOrders){
if (nonUpdCaseMap.get(c.Id).Status != 'Closed' && c.Status == 'Closed'){
if (c.Type == 'Repair' || c.Type == 'Routine Maintenance'){
validIds.add(c.Id);


}
}
}

if (!validIds.isEmpty()){
List newCases = new List();
Map closedCasesM = new Map([SELECT Id, Vehicle__c, Equipment__c, Equipment__r.Maintenance_Cycle__c,(SELECT Id,Equipment__c,Quantity__c FROM Equipment_Maintenance_Items__r)
FROM Case WHERE Id IN :validIds]);
Map maintenanceCycles = new Map();
AggregateResult[] results = [SELECT Maintenance_Request__c, MIN(Equipment__r.Maintenance_Cycle__c)cycle FROM Equipment_Maintenance_Item__c WHERE Maintenance_Request__c IN :ValidIds GROUP BY Maintenance_Request__c];

for (AggregateResult ar : results){
maintenanceCycles.put((Id) ar.get('Maintenance_Request__c'), (Decimal) ar.get('cycle'));
}

for(Case cc : closedCasesM.values()){
Case nc = new Case (
ParentId = cc.Id
,
Status = 'New',
Subject = 'Routine Maintenance',
Type = 'Routine Maintenance',
Vehicle__c = cc.Vehicle__c,
Equipment__c =cc.Equipment__c,
Origin = 'Web',
Date_Reported__c = Date.Today()

);

If (maintenanceCycles.containskey(cc.Id)){
nc.Date_Due__c = Date.today().addDays((Integer) maintenanceCycles.get(cc.Id));
} else {
nc.Date_Due__c = Date.today().addDays((Integer) cc.Equipment__r.maintenance_Cycle__c);
}

newCases.add(nc);
}

insert newCases;

List clonedWPs = new List();
for (Case nc : newCases){
for (Equipment_Maintenance_Item__c wp : closedCasesM.get(nc.ParentId).Equipment_Maintenance_Items__r){
Equipment_Maintenance_Item__c wpClone = wp.clone();
wpClone.Maintenance_Request__c = nc.Id;
ClonedWPs.add(wpClone);

}
}
insert ClonedWPs;
}
}
}
2.MaitenanceRequest:
trigger MaintenanceRequest on Case (before update, after update) {
if(Trigger.isUpdate && Trigger.isAfter){
MaintenanceRequestHelper.updateWorkOrders(Trigger.New
, Trigger.OldMap);
}
}