global class batchLogBookManagementV2 implements Database.Batchable<sObject> {

global List<Log_Book__c> logToBeContinued = new List<Log_Book__c> ();
global List<Log_Book__c> logToBeInserted = new List<Log_Book__c> ();    
global List<Subject_Registered__c> sbsr = new List<Subject_Registered__c> ();
    
    global List<Weeks__c> weekList = Weeks__c.getAll().values();
    global Map<Integer, Weeks__c> weekMap = new Map<Integer, Weeks__c>();
    global Map<String, Integer> weekMapGetIntWithWeek = new Map<String, Integer>();    
    global Map<String, Subjects_and_Levels__c> subjectLevelMap =  Subjects_and_Levels__c.getAll();
    global List<Subjects_and_Levels__c> subjectLevelList = subjectLevelMap.values();
    global Map<String, Subjects_and_Levels__c> levelMap = new Map<String, Subjects_and_Levels__c>();
        
global final String query = 'SELECT id, Last_Schedule__c, Level__c, Student__c, Subject__c, Week__c, (SELECT Student__c, Subjects_Registered__c, Subject__c, Class_Scheduled_Date__c, Level__c, Week__c FROM Log_Books__r ORDER By Class_Scheduled_Date__c DESC NULLS FIRST LIMIT 1 ) FROM Subject_Registered__c WHERE Deactivated__c = false AND Last_Schedule__c != null';
 
 
global Iterable<sObject> start(Database.BatchableContext BC){
     sbsr = Database.query(query);
     for(Subject_Registered__c s: sbsr)
     {
         logToBeContinued.add(s.log_Books__r[0]);         
     }
    
    return logToBeContinued;
    }
 
global void execute(Database.BatchableContext BC,List<Log_Book__c> scope){
     for(Subjects_and_Levels__c level: subjectLevelList)
     {
     system.debug('level : '+level);
         if(level !=null)
         levelMap.put(level.subject__c+Integer.valueof(level.Order__c), level);
         else
             system.debug('error as level null');
     }
    for(Weeks__c week : weekList)
    {
    system.debug('week : '+week);
        if(week != null){
            weekMap.put((Integer)week.Order__c, week);
            weekMapGetIntWithWeek.put(week.Name, (Integer)week.Order__c);
        }
    }
     System.debug('++++++++++++++++++++++++   : ' + scope);
     for(Log_Book__c s: scope)
     {
         
         System.debug('logToBeInserted--------------------------------   : ' + logToBeInserted.size());
         System.debug('--------------------------------   : ' + s);
         Integer totalLevels = 0;
          if(s.Subject__c == 'English')
            totalLevels = 16;
          else if(s.Subject__c == 'Abacus')
            totalLevels = 11;
          else if(s.Subject__c == 'Math')
            totalLevels = 14;
          else if(s.Subject__c == 'G.K')
            totalLevels = 3;
         System.debug('xxxxxxxxxxxxxxxx  : ' + subjectLevelMap);
         //System.debug('@@Subject@@@@@@@'+subjectLevelMap.get(s.Subject__c+s.level__c));
         
             Integer levelOrder = Integer.valueof(subjectLevelMap.get(s.Subject__c +':'+s.Level__c).Order__c);
             system.debug('level order: '+levelOrder);
             Integer weekOrder = Integer.ValueOf(weekMapGetIntWithWeek.get(s.Week__c));
             system.debug('week order: '+weekOrder);
         
         Log_Book__c l = new Log_Book__c ();
         l.Student__c = s.Student__c;
         l.Subject__c = s.Subject__c;
         l.Subjects_Registered__c = s.Subjects_Registered__c;
         l.Class_Scheduled_Date__c = s.Class_Scheduled_Date__c.addDays(7);
           
         if(s.Week__c == '26-Z')
         {
             if(levelOrder < totalLevels)
             {
                 levelOrder = levelOrder +1;
                 System.Debug('lb.Subject__c+levelOrder : '+ l.Subject__c+levelOrder);
                 l.level__c = levelMap.get(l.Subject__c+levelOrder).Level__c;
                 l.Week__c = '1-A';
                 logToBeInserted.add(l);
             }
             
         }
         else
          if(s.Subject__c == 'Math' && s.Level__c == 'Level 5B' && s.Week__c == '17-Q')
            {
              if(levelOrder < totalLevels)
             {
                 levelOrder = levelOrder +1;
                 System.Debug('lb.Subject__c+levelOrder : '+ l.Subject__c+levelOrder);
                 l.level__c = levelMap.get(l.Subject__c+levelOrder).Level__c;
                 l.Week__c = '1-A';
                 logToBeInserted.add(l);
             }
       
            }
         else
         {
                weekOrder = weekOrder+1;
                l.Week__c = weekMap.get(weekOrder).Name;
                l.Level__c = s.Level__c;
                logToBeInserted.add(l);
                    
         }
         
         
     }
    if(logToBeInserted.size()>0)
    {
               
        Database.SaveResult[] srList = Database.insert(logToBeInserted, false);
        
        // Iterate through each returned result
        for (Database.SaveResult sr : srList) {
            if (sr.isSuccess()) {
                // Operation was successful, so get the ID of the record that was processed
                System.debug('Successfully inserted LogBook. LogBook ID: ' + sr.getId());
            }
            else {
                // Operation failed, so get all errors                
                for(Database.Error err : sr.getErrors()) {
                    System.debug('The following error has occurred.');                    
                    System.debug(err.getStatusCode() + ': ' + err.getMessage());
                    System.debug('Account fields that affected this error: ' + err.getFields());
                }
            }    
        
        }
        
    }
    //  System.debug('###############################  :' + ((Subject_Registered__c)scope.get(0)).log_Book__r.Class_Scheduled_Date__c);
    // scope variable now has the records received from QueryLocator.
  //  delete scope;    
   // Database.emptyRecycleBin(scope);
    }
 
global void finish(Database.BatchableContext BC){
AsyncApexJob a = [SELECT Id, Status, NumberOfErrors, JobItemsProcessed, TotalJobItems, CreatedBy.Email FROM AsyncApexJob WHERE Id =:BC.getJobId()];
 
    // Send an email to the Apex job's submitter
    // notifying of job completion.
  
 Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
 String[] toAddresses = new String[] {a.CreatedBy.Email};
 mail.setToAddresses(toAddresses);
 mail.setSubject('BAtch: ' + a.Status);
 mail.setPlainTextBody('The batch Apex job processed ' + a.TotalJobItems +' batches with '+ a.NumberOfErrors + ' failures.');
 Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
  }
}