Controller:

public with sharing class costsheet {
   
    

    public String OrderId;
    public Order ord;
    
    
    public costsheet(ApexPages.StandardController controller) {
      listIex =0.0;
      CFSList =0.0;
      CHAList =0.0;
      CHAListS =0.0;
      ord= (Order)Controller.getRecord();
      OrderId=Apexpages.currentpage().getParameters().get('id');
      system.debug('listStemer>>'+OrderId);
      listStemer=[Select Id,subtotal__c,Supplier_Order__c from Shipper_Info_India__c where Supplier_Order__c =:ord.id AND RecordType.Name='Steamer Charges' limit 1]  ;
      system.debug('listStemer>>'+listStemer);
     if(listStemer.size()>0)
     {
     listIex =listStemer[0].subtotal__c;
     system.debug('listStemer>>'+listIex );
     }
     listCHAChargesR=[Select Id,subtotal__c,Supplier_Order__c  from Shipper_Info_India__c where Supplier_Order__r.id =:ord.id AND RecordType.Name='CHA Charges' AND Bill_Type__c = 'Reimbursement Type'] ;
     if(listCHAChargesR.size()>0)
     {
     CHAList =listCHAChargesR[0].subtotal__c;
     }
     listCHAChargesS=[Select Id,subtotal__c,Supplier_Order__c  from Shipper_Info_India__c where Supplier_Order__r.id =:ord.id AND RecordType.Name='CHA Charges' AND Bill_Type__c = 'Service Type'] ;
     if(listCHAChargesS.size()>0)
     {
     CHAListS =listCHAChargesS[0].subtotal__c;
     }
     listCFSCharges=[Select Id,subtotal__c,Supplier_Order__c  from Shipper_Info_India__c where Supplier_Order__r.id =:ord.id AND RecordType.Name='CFS Charges' limit 1] ;
     if(listCFSCharges.size()>0)
     {
     CFSList =(listCFSCharges[0].subtotal__c).setScale(2);
     }
     
     Calculation();
    
    
    }
    
        public List<Shipper_Info_India__c > listStemer;
        public List<Shipper_Info_India__c > listCFSCharges;
        public List<Shipper_Info_India__c > listCHAChargesR;
        public List<Shipper_Info_India__c > listCHAChargesS;
        public Decimal CFSList {get;set;}
        public Decimal CHAList {get;set;}
        Public Decimal listIex {get;set;}
        public Decimal CHAListS {get;set;}
        public List<Order> ordList = new List<Order>();
        public Decimal TotalAmount_3{get;set;}
        public Decimal TotalFreightAmount_19{get;set;}
        public Decimal TotalFreightAmount_21{get;set;}
        public Decimal TotalFreightAmount_c21{get;set;}
        public Decimal TotalFreightAmount_d21{get;set;}
        public Decimal BasicDuty_c23{get;set;}
        public Decimal BasicDuty_d23{get;set;}
        public Decimal Cess_c24{get;set;}
        public Decimal Cess_d24{get;set;}
        public Decimal TotalCustomDuty_g25{get;set;}
        public Decimal TotalCustomDuty_c25{get;set;}
        public Decimal TotalCustomDuty_d25{get;set;}
        public Decimal ShippingLine_c27 {get;set;}
        public Decimal ShippingLine_d27 {get;set;}
        public Decimal StorageCFS_c32 {get;set;}
        public Decimal StorageCFS_d32 {get;set;}
        public Decimal Others_c30 {get;set;} 
        public Decimal Others_d30 {get;set;} 
        public Decimal Clearing_c31 {get;set;}
        public Decimal Clearing_d31 {get;set;}
        public Decimal TotalC {get;set;}
        public Decimal TotalCost{get;set;}
        public decimal TotalC_c37 {get;set;}
        public decimal TotalC_d37 {get;set;}
        public decimal TotalCost_c38 {get;set;}
        public decimal TotalCost_d38 {get;set;}
        
            
        public void Calculation(){
         TotalAmount_3 = 0;
         TotalFreightAmount_19= 0;
         if(ord.Quantity__c != NULL && ord.Unit_Price__c != null){
            TotalAmount_3 = (ord.Unit_Price__c *ord.Quantity__c).setScale(2);
          }else{
           TotalAmount_3=0;
          }
          if(ord.Total_Insurance__c != null){
          // Need to update this with adding Freight charges
           TotalFreightAmount_19= (ord.Total_Insurance__c+ord.Total_Sea_Freight_Charges__c+TotalAmount_3).setscale(2) ;
           }else{
           TotalFreightAmount_19=0;
           }
           if(ord.Exchange_Rate_PO_Currency_to_INR__c != null)
           {
           TotalFreightAmount_21 = (TotalFreightAmount_19*ord.Exchange_Rate_PO_Currency_to_INR__c).setscale(2);
          }else{
            TotalFreightAmount_21=(0+TotalFreightAmount_19).setscale(2);
          }
          if(TotalFreightAmount_19 != 0)
           {
           TotalFreightAmount_c21 = (TotalFreightAmount_21/ord.Quantity__c/1000).setscale(2);
          }
           
          if(ord.Exchange_Rate_PO_Currency_to_INR__c != null)
           {
           TotalFreightAmount_d21 = (TotalFreightAmount_c21*1000/ord.Exchange_Rate_PO_Currency_to_INR__c).setscale(2);
          }else{
          TotalFreightAmount_d21=0;
          }
          if(ord.Basic_Customs_Duty_value__c != null)
           {
           BasicDuty_c23 = (ord.Basic_Customs_Duty_value__c/ord.Quantity__c/1000).setscale(2);
          }else{
           BasicDuty_c23=0;
          }
          if(ord.Exchange_Rate_PO_Currency_to_INR__c != null)
           {
           BasicDuty_d23 = (BasicDuty_c23*1000/ord.Exchange_Rate_PO_Currency_to_INR__c).setscale(2);
          }else{
           BasicDuty_d23=0;
          }  
          if(ord.Social_Welfare_Surcharge__c != null)
           {
           Cess_c24 = (ord.Social_Welfare_Surcharge__c/ord.Quantity__c/1000).setscale(2);
          }else{
           Cess_c24=0;
          }
          if(ord.Exchange_Rate_PO_Currency_to_INR__c != null)
           {
           Cess_d24 = (Cess_c24*1000/ord.Exchange_Rate_PO_Currency_to_INR__c).setscale(2);
          }else{
           Cess_d24=0;
          }  
          if(ord.Basic_Customs_Duty_value__c != null && ord.Social_Welfare_Surcharge__c != null)
          {
           TotalCustomDuty_g25=(ord.Basic_Customs_Duty_value__c+ord.Social_Welfare_Surcharge__c).setscale(2);
          }else{
            TotalCustomDuty_g25=0;
          }
          if(TotalCustomDuty_g25 != 0)
           {
           TotalCustomDuty_c25 = (TotalCustomDuty_g25/ord.Quantity__c/1000).setscale(2);
          }else{
           TotalCustomDuty_c25 =0;
          }
          if(ord.Exchange_Rate_PO_Currency_to_INR__c != null)
           {
           TotalCustomDuty_d25 = (TotalCustomDuty_c25*1000/ord.Exchange_Rate_PO_Currency_to_INR__c).setscale(2);
          } else{
           TotalCustomDuty_d25 =0;
          }
          if(listIex != null)
           {
           ShippingLine_c27 = (listIex/ord.Quantity__c/1000).setscale(2);
          }else{
           ShippingLine_c27 =0;
          }
          if(ord.Exchange_Rate_PO_Currency_to_INR__c != null)
           {
           ShippingLine_d27 = (ShippingLine_c27*1000/ord.Exchange_Rate_PO_Currency_to_INR__c).setscale(2);
          } else{
           ShippingLine_d27 =0;
          }
          if(CFSList != null)
           {
           StorageCFS_c32 = (CFSList/ord.Quantity__c/1000).setscale(2);
          }else{
           StorageCFS_c32 =0;
          }
          if(ord.Exchange_Rate_PO_Currency_to_INR__c != null)
           {
           StorageCFS_d32 = (StorageCFS_c32*1000/ord.Exchange_Rate_PO_Currency_to_INR__c).setscale(2);
          } else{
           StorageCFS_d32 =0;
          }
          
          if(CHAList != null)
           {
           Others_c30 = (CHAList/ord.Quantity__c/1000).setscale(2);
          }else{
           Others_c30  =0;
          }
          if(ord.Exchange_Rate_PO_Currency_to_INR__c != null)
           {
           Others_d30  = (Others_c30 *1000/ord.Exchange_Rate_PO_Currency_to_INR__c).setscale(2);
          } else{
           Others_d30  =0;
          }
          
          if(CHALists != null)
           {
           Clearing_c31 = (CHALists/ord.Quantity__c/1000).setscale(2);
          }else{
           Clearing_c31  =0;
          }
          if(ord.Exchange_Rate_PO_Currency_to_INR__c != null)
           {
           Clearing_d31  = (Clearing_c31 *1000/ord.Exchange_Rate_PO_Currency_to_INR__c).setscale(2);
          } else{
           Clearing_c31  =0;
          }
          
          
          TotalC = (listIex+CHAList+CHAListS+CFSList).setscale(2);
          TotalCost = (TotalC+TotalFreightAmount_21+TotalCustomDuty_g25).setscale(2);
          
          if(TotalC != null)
           {
           TotalC_c37= (TotalC/ord.Quantity__c/1000).setscale(2);
          }else{
           TotalC_c37=0;
          }
          if(ord.Exchange_Rate_PO_Currency_to_INR__c != null)
           {
           TotalC_d37= (TotalC_c37*1000/ord.Exchange_Rate_PO_Currency_to_INR__c).setscale(2);
          } else{
           TotalC_d37=0;
          }
          
           if(TotalCost != null)
           {
           TotalCost_c38= (TotalCost/ord.Quantity__c/1000).setscale(2);
          }else{
           TotalCost_c38=0;
          }
          if(ord.Exchange_Rate_PO_Currency_to_INR__c != null)
           {
           TotalCost_d38= (TotalCost_c38*1000/ord.Exchange_Rate_PO_Currency_to_INR__c).setscale(2);
          } else{
           TotalCost_d38=0;
          }
          
          
        }
          
       
        
           
      
   //Method to Save Attachments   
    
    public PageReference  SaveAttachmentpdf() {
        system.debug('In save');
        blob pdfBody;
        PageReference thePDF =  new PageReference('/apex/costsheetpdf?id='+OrderId);
        system.debug('ORD--'+OrderId);
        thePDF.setRedirect(true);
           
          if(Test.isRunningTest()) { 
             pdfBody = blob.valueOf('Unit.Test');
            } else {
             pdfBody = thePDF.getContentAsPDF();
           }
            Attachment attach = new Attachment();
            attach.body = pdfBody;
            attach.Name='CostSheetPdf '+System.Now();
            system.debug('OrderId'+OrderId);
            attach.ParentId=OrderId;
            attach.ContentType = 'application/pdf';
            Insert attach;
            
        if (attach == null){
              ApexPages.addmessage(new ApexPages.message(ApexPages.severity.ERROR,'Error will Saving a file .Please check the content of the file'));  
           }
        if (attach != null){
             ApexPages.addmessage(new ApexPages.message(ApexPages.severity.CONFIRM,'Quote Pdf generated successfully'));
            
          }
      PageReference qtpage = new PageReference('/'+OrderId);
      qtpage.setRedirect(true); 
      
      return thePDF;
   }