<?php
if (!defined('BASEPATH')) exit('No direct script access allowed');

/*
 * InvoicePlane
 *
 * @author      InvoicePlane Developers & Contributors
 * @copyright   Copyright (c) 2012 - 2017 InvoicePlane.com
 * @license     https://invoiceplane.com/license.txt
 * @link        https://invoiceplane.com
 */

/**
 * Class Ajax
 */
class Ajax extends Admin_Controller
{
    public $ajax_controller = true;

    public function save()
    {
		

        $this->load->model('invoices/mdl_items');
        $this->load->model('invoices/mdl_invoices');
        $this->load->model('units/mdl_units');
        $this->load->model('invoices/mdl_invoice_sumex');
    
        $this->load->library('email');

        $invoice_id = $this->input->post('invoice_id');
		
		/*tamilbala */
        //$deletestatus = $this->input->post('deletestatus');
		/*tamilbala*/
		
        //print_r($deletestatus);
		//print_r('delete');
       // $quoteid = $this->input->post('quoteid ');

        // echo $quoteid;
        // die();

        
        $this->mdl_invoices->set_id($invoice_id);
    
        if ($this->mdl_invoices->run_validation('validation_rules_save_invoice')) {
            $items = json_decode($this->input->post('items'));

            $quoteid = $this->input->post('quoteid');
            $qu = $this->input->post('qu');
             

             if(($quoteid == 0) && ($qu !=0))
             {
                $quoteid1=$qu;
             }

             else
             {
                $quoteid1=$quoteid;
             }
             
          ///echo $quoteid1;
               //  print_r($items);

             //die();
       //print_r($items);
        //die();
            foreach ($items as $item) {
                
                // Check if an item has either a quantity + price or name or description
                if (!empty($item->item_name)) {

                   
                   $item->item_quantity = ($item->item_quantity ? standardize_amount($item->item_quantity) : floatval(0));

                    $item->item_price = ($item->item_price ? standardize_amount($item->item_price) : floatval(0));
                   
                    $item->item_discount_amount = ($item->item_discount_amount) ? standardize_amount($item->item_discount_amount) : null;
                     
                    $item->item_product_id = ($item->item_product_id ? $item->item_product_id : null);

                    $itemproductid=  $item->item_product_id;
                    $itemprice = $item->item_price;
                    $itemqty = $item->item_quantity;

                  
                   // echo $item->item_price;
                    // die();

                    if($quoteid1 != 0)
                    {

                      
                    $reqqty= $this->mdl_invoices->GetOrder_qty($quoteid1,$itemproductid);

                    $qidcheck= $this->mdl_invoices->Check_Qid($quoteid1);

                    $item_chek =$this->mdl_invoices->check_item($quoteid1,$itemproductid);

                    //echo count($item_chek);
                    //echo "</br>";

                    //die();                     
                    $innv='';
                    $Isqid='';

                   
                     foreach($qidcheck as $q)
                     {
                       $Isqid = $q->quotecount;
                       $Isinv = $q->invoice_id;

                       if($Isinv == $invoice_id)
                       {
                        $innv = 1;
                       }

                     }  

                     if($innv == 1)
                     {
                        $invorderdqty= $this->mdl_invoices->GetInvOrdered($invoice_id);

                        foreach($invorderdqty as $in)
                        {
                            $previousorder= $in->item_quantity;
                        }
                     }

                     else if($Isqid !='')
                     {
              
                        $invorderdqty= $this->mdl_invoices->GetquoteOrdered($quoteid1);

                        foreach($invorderdqty as $in)
                        {
                            $previousorder= $in->item_suppliedquantity;
                            
                        }
                     }

              
                     // echo $Isqid;
                     // die();
                     $orderqty=0;
                     $supqty=0;
                     $balqty=0;

                     if(!empty($reqqty))
                     {
                    
                    foreach($reqqty as $req)
                    {
                       $orderqty = $req->orderedqty;
                       $supqty = $req->supqty;
                       $balqty = $req->balqty;
                    }
                    }

                      // echo "or".$orderqty."sup".$supqty."bal".$balqty."pre".$previousorder;
                      //  die();

                    $oqty =$orderqty;
                   
                   if($innv == 1)
                   {
                    $suppliedqty = $item->item_quantity+$supqty-$previousorder;
                    $balanceqty = $oqty - $suppliedqty;
                   
                   }

                   else if($Isqid !='')
                   {
                     $suppliedqty=$item->item_quantity+$previousorder;
                     $balanceqty = $oqty - $suppliedqty;
                     
                   }
                 

                   else 
                   {
                       
                    $suppliedqty = ($item->item_quantity);
                    $balanceqty = ($oqty - ($item->item_quantity));
                   }
                 

                   if($balanceqty == 0)
                   {
                     $item_status="0";
                   }

                   else
                   {
                     $item_status ="1";
                   }
                  
    $updatearray = array('item_balancequantity'=>$balanceqty,'item_suppliedquantity'=>$suppliedqty,'item_status'=>$item_status);  

 //print_r($updatearray);
 // die();
    if(count($item_chek) !=0)
    {
    $quoteupdate= $this->mdl_invoices->Update_Qty($quoteid1,$updatearray,$itemproductid);
     }      
                    }

                    else
                    {
                      $oqty =$item->item_quantity; 
                      $suppliedqty =$oqty;
                      $balanceqty = 0;

                    }

                    //
                    $item->item_product_unit_id = ($item->item_product_unit_id ? $item->item_product_unit_id : null);
                    
                    $item->item_product_unit = $this->mdl_units->get_name($item->item_product_unit_id, $item->item_quantity);
                     
                    $item_id = ($item->item_id) ?: null;


                    unset($item->item_id);
                     
                    if (!$item->item_task_id) 
                    {
                        unset($item->item_task_id);
                    } 
                    else 
                    {
                        $this->load->model('tasks/mdl_tasks');
                        $this->mdl_tasks->update_status(4, $item->item_task_id);
                    }
               // print_r($item);
               // die();

                   // $prodate = 

                    $dt = new DateTime('now', new DateTimeZone('Asia/Kolkata'));                
                    $prodate =  $dt->format('Y-m-d');


$productcheck = $this->mdl_items->Check_invoice($invoice_id,$itemproductid);  

//echo count($productcheck);

$iten_check = count($productcheck);

//echo $iten_check;

$Getmaterial_code = $this->mdl_items->GetMaterialCode($itemproductid);

$material_code='';
foreach($Getmaterial_code as $mas)
{
$material_code = $mas->MaterialCode;
}
//echo $material_code;die();

$GetclientId = $this->mdl_items->GetClientID($invoice_id);

$clientId='';

foreach($GetclientId as $cs)
{
$clientId = $cs->client_id;
}

$dt = new DateTime('now', new DateTimeZone('Asia/Kolkata'));       
$createddt =  $dt->format('Y-m-d H:i:s');


$get_transctiontype = $this->mdl_items->GetTransactionType($invoice_id);


//$getcreditdet = $this->mdl_items->CheckCredit($invoice_id);

//print_r($getcreditdet);die();

//$crecheck = count($getcreditdet);


     // print_r($get_transctiontype);die();

     $count_of_inv='';

     $tratype='';  

     $ReType ='';

     foreach($get_transctiontype as $ge)
     {
         $count_of_inv= $ge->creditinvoice_parent_id;
     }

     
     if(count($count_of_inv)<=0)
     {
        $tratype='Reduce'; 

        $ReType ='Invoice'; 
     }

     else
     {
        $tratype='Add'; 
        $ReType ='Credit Note'; 
     }


    $creditQty = abs($itemqty);


    //echo $creditQty;die();

if($count_of_inv>0)
{
     // if($crecheck<=0)
     // {
           // $stockHistory = array('MaterialCode'=>$material_code,'Transaction_type'=>'Add','Ref_Type'=>'Credit Note','Ref_No'=>$invoice_id,'SupplierID'=>$clientId,'Quantity'=>$creditQty,'ItemValue'=>$itemprice,'CreatedOn'=>$createddt);

          // //$saveStockHistory = $this->mdl_items->SaveStockHistory($stockHistory);
     // }

     // else
     // {
         // $stockHistory = array('MaterialCode'=>$material_code,'Quantity'=>$creditQty,'ItemValue'=>$itemprice,'UpdatedOn'=>$createddt);   

           // //$updateFinalHistory = $this->mdl_items->UpdateStockHistory($stockHistory,$invoice_id,$material_code);

     // }
}


if($iten_check>0)
{


//echo 'if';die();
  $final_productarray=array('ProductCode'=>$itemproductid,'Quantity'=>$itemqty,'Price'=>$itemprice,'Transactiondate'=>$prodate);

  //$savefinal = $this->mdl_items->UpdateFinalHistory($final_productarray,$invoice_id,$itemproductid);     


  $stockHistory = array('MaterialCode'=>$material_code,'Quantity'=>$itemqty,'ItemValue'=>$itemprice,'UpdatedOn'=>$createddt);   

  //$updateFinalHistory = $this->mdl_items->UpdateStockHistory($stockHistory,$invoice_id,$material_code);


}

else
{


    //echo 'else';die();
     // $invoice_details= $this->mdl_items->GetInvoiceDeatisl($invoice_id);
        // $inv_no='';

        // if(!empty($invoice_details))
        // {
            // foreach($invoice_details as $in)
            // {
                 // $inv_no = $in->invoice_number;
            // }
        // }


     //$finalhistory= array('RefID'=>$inv_no,'invoice_id'=>$invoice_id,'TransactionType'=>'Outward','ProductCode'=>$itemproductid,'Quantity'=>$itemqty,'Price'=>$itemprice,'Transactiondate'=>$prodate);

     //$saveinvhistory=$this->mdl_items->SaveFinalHistory($finalhistory);


     // $tratype='';  

     // $get_transctiontype = $this->mdl_items->GetTransactionType($invoice_id);

     // print_r($get_transctiontype);die();


     //$stockHistory = array('MaterialCode'=>$material_code,'Transaction_type'=>'Reduce','Ref_Type'=>'Invoice','Ref_No'=>$invoice_id,'SupplierID'=>$clientId,'Quantity'=>$itemqty,'ItemValue'=>$itemprice,'CreatedOn'=>$createddt);


     //$saveStockHistory = $this->mdl_items->SaveStockHistory($stockHistory);
}
                   // echo $invoice_id;
                    //echo $item_id;
               $invexist= $this->mdl_items->Check_invoice($invoice_id,$item_id); 

               //echo count($invexist);
               //die();        
                    $this->mdl_items->save($item_id, $item);
                   
              
                } 

                else 
                {
                    // Throw an error message and use the form validation for that
                    $this->load->library('form_validation');
                   // $this->form_validation->set_rules('item_name', trans('item'), 'required');
                    $this->form_validation->run();

                    $response = array(
                        'success' => 0,
                        'validation_errors' => array(
                        'item_name' => form_error('item_name', '', ''),
                        )
                    );

                    echo json_encode($response);
                    exit;
                }
            }


            $invoicedetails=array('invoice_id'=>$invoice_id,'quote_id'=>$quoteid1);
            
            $InvId_check= $this->mdl_invoices->CheckInvId($invoice_id);


            foreach($InvId_check as $idc)
            {
                $cid = $idc->invcount;
            }

            
            if($quoteid1 !=0)
            {
            if($cid == 0)
            {

            $saveinvtable=$this->mdl_invoices->Save_quote_to_invtable($invoicedetails);
            }
            }


            $invoice_status = $this->input->post('invoice_status_id');

            //echo $invoice_status;


            if ($this->input->post('invoice_discount_amount') === '') 
            {
                $invoice_discount_amount = floatval(0);
            } 
            else 
            {
                $invoice_discount_amount = $this->input->post('invoice_discount_amount');
            }


            if ($this->input->post('invoice_discount_percent') === '') {
                $invoice_discount_percent = floatval(0);
            } else {
                $invoice_discount_percent = $this->input->post('invoice_discount_percent');
            }

            // Generate new invoice number if needed
            $invoice_number = $this->input->post('invoice_number');

            if (empty($invoice_number) && $invoice_status != 1) {
                $invoice_group_id = $this->mdl_invoices->get_invoice_group_id($invoice_id);
                $invoice_number = $this->mdl_invoices->get_invoice_number($invoice_group_id);
            }


            $db_array = array(
                'invoice_number' => $invoice_number,
                'invoice_terms' => $this->input->post('invoice_terms'),
                'invoice_date_created' => date_to_mysql($this->input->post('invoice_date_created')),
                'invoice_date_due' => date_to_mysql($this->input->post('invoice_date_due')),
                'invoice_password' => $this->input->post('invoice_password'),
                'invoice_status_id' => $invoice_status,
                'payment_method' => $this->input->post('payment_method'),
                'invoice_discount_amount' => standardize_amount($invoice_discount_amount),
                'invoice_discount_percent' => standardize_amount($invoice_discount_percent),
            );


            //print_r($db_array);


            // check if status changed to sent, the feature is enabled and settings is set to sent
            if ($this->config->item('disable_read_only') === false) {
                if ($invoice_status == get_setting('read_only_toggle')) {
                    $db_array['is_read_only'] = 1;
                }
            }

            $this->mdl_invoices->save($invoice_id, $db_array);
            $sumexInvoice = $this->mdl_invoices->where('sumex_invoice', $invoice_id)->get()->num_rows();


            if ($sumexInvoice >= 1) {
                $sumex_array = array(
                    'sumex_invoice' => $invoice_id,
                    'sumex_reason' => $this->input->post('invoice_sumex_reason'),
                    'sumex_diagnosis' => $this->input->post('invoice_sumex_diagnosis'),
                    'sumex_treatmentstart' => date_to_mysql($this->input->post('invoice_sumex_treatmentstart')),
                    'sumex_treatmentend' => date_to_mysql($this->input->post('invoice_sumex_treatmentend')),
                    'sumex_casedate' => date_to_mysql($this->input->post('invoice_sumex_casedate')),
                    'sumex_casenumber' => $this->input->post('invoice_sumex_casenumber'),
                    'sumex_observations' => $this->input->post('invoice_sumex_observations')
                );
                $this->mdl_invoice_sumex->save($invoice_id, $sumex_array);
            }

            
            // Recalculate for discounts
            $this->load->model('invoices/mdl_invoice_amounts');
           // $this->mdl_invoice_amounts->calculate($invoice_id);

            $response = array(
                'success' => 1,
            );
        } else {
            $this->load->helper('json_error');
            $response = array(
                'success' => 0,
                'validation_errors' => json_errors()
            );
        }
   //print_r($this->input->post('custom'));
$values = [];
    if($quoteid1 == 0)
    {
        // Save all custom fields
        if ($this->input->post('custom')) {

          //print_r($this->input->post('custom'));

           $varray=$this->input->post('custom');


            $db_array = array();

            
            foreach ($this->input->post('custom') as $custom) 
            {

               // print_r($custom);
                if (preg_match("/^(.*)\[\]$/i", $custom['name'], $matches)) 
                {
                    $values[$matches[1]][] = $custom['value'];

                    //echo $custom['value'];
                } 

                else 
                {
                    $values[$custom['name']] = $custom['value'];

                    //echo $values[$custom['name']];
                }
            }

            foreach ($values as $key => $value) 
            {

                preg_match("/^custom\[(.*?)\](?:\[\]|)$/", $key, $matches);
                if ($matches) 
                {
                   
                    $db_array[$matches[1]] = $value;
                }
            }
          

           $this->load->model('custom_fields/mdl_invoice_custom');

            
            $result = $this->mdl_invoice_custom->save_custom($invoice_id, $db_array);

//die();
            if ($result !== true) {
                $response = array(
                    'success' => 0,
                    'validation_errors' => $result
                );

                echo json_encode($response);
                exit;
            }
        }
    }

    else
    {
//$this->load->model('invoices/mdl_items');

         if ($this->input->post('custom')) {

         // print_r($this->input->post('custom'));

           $varray=$this->input->post('custom');

           $Quotecustomvalue= $this->mdl_items->get_quoteproduct($quoteid1);
          // print_r($Quotecustomvalue);


           $pono =  $Quotecustomvalue[0]->quote_pono;
           $dmy = date('d-m-Y',strtotime($Quotecustomvalue[0]->po_date_created));

           // echo $pono;
           // echo $dmy;
           // die();
            

            $db_array = array();

            
            foreach ($this->input->post('custom') as $custom) 
            {

               
                if (preg_match("/^(.*)\[\]$/i", $custom['name'], $matches)) 
                {
                    $values[$matches[1]][] = $custom['value'];

                   
                } 

                else 
                {
                    $values[$custom['name']] = $custom['value'];

                   
                }
            }

            foreach ($values as $key => $value) 
            {
                
            if(($key !="custom[15]") && ($key !="custom[14]"))
            {

                   
            }else{

                if($key == "custom[14]")
                {
                    $value=$pono;
                }
                else if($key == "custom[15]")
                {
                    $value=$dmy;
                }
                
            }
          
          preg_match("/^custom\[(.*?)\](?:\[\]|)$/", $key, $matches);
                if ($matches) 
                 {
                   
                    $db_array[$matches[1]] = $value;
                }


                // print_r($db_array);
            $this->load->model('custom_fields/mdl_invoice_custom');

            
      $result = $this->mdl_invoice_custom->save_custom($invoice_id, $db_array);


        }
        //print_r($db_array);
  
            if ($result !== true) {
                $response = array(
                    'success' => 0,
                    'validation_errors' => $result
                );

                echo json_encode($response);
                exit;
            }
        }


    }
       
        echo json_encode($response);
    }


    public function save_invoice_tax_rate()
    {
      
          
        $this->load->model('invoices/mdl_invoice_tax_rates');

        if ($this->mdl_invoice_tax_rates->run_validation()) {
            $this->mdl_invoice_tax_rates->save();

            $response = array(
                'success' => 1
            );
        } else {
            $response = array(
                'success' => 0,
                'validation_errors' => $this->mdl_invoice_tax_rates->validation_errors
            );
        }

        echo json_encode($response);
    }

    public function create()
    {
        $this->load->model('invoices/mdl_invoices');
        $this->load->model('invoices/mdl_items');        

        if ($this->mdl_invoices->run_validation()) {
            $invoice_id = $this->mdl_invoices->create();

            $response = array(
                'success' => 1,
                //'drpcheck'=>$dropcheck,
                'invoice_id' => $invoice_id
            );
        } else {
            $this->load->helper('json_error');
            $response = array(
                'success' => 0,
                'validation_errors' => json_errors()
            );
        }

        // $invoice_details= $this->mdl_items->GetInvoiceDeatis($invoice_id);
        // $inv_no='';

        // if(!empty($invoice_details))
        // {
        //     foreach($invoice_details as $in)
        //     {
        //          $inv_no = $in->invoice_number;
        //     }
        // }

        // $finalhistory= array('RefID'=>$inv_no,'invoice_id'=>$invoice_id,'TransactionType'=>'Outward');
        // $saveinvhistory=$this->mdl_items->SaveFinalHistory($finalhistory);

        echo json_encode($response);
    }

    public function create_recurring()
    {
        $this->load->model('invoices/mdl_invoices_recurring');

        if ($this->mdl_invoices_recurring->run_validation()) {
            $this->mdl_invoices_recurring->save();

            $response = array(
                'success' => 1,
            );
        } else {
            $this->load->helper('json_error');
            $response = array(
                'success' => 0,
                'validation_errors' => json_errors()
            );
        }

        echo json_encode($response);
    }

    public function get_item()
    {
        $this->load->model('invoices/mdl_items');

        $item = $this->mdl_items->get_by_id($this->input->post('item_id'));
        print_r($item);
        echo json_encode($item);
    }

    public function modal_create_invoice()
    {


        $this->load->module('layout');
        $this->load->model('invoice_groups/mdl_invoice_groups');
        $this->load->model('tax_rates/mdl_tax_rates');
        $this->load->model('clients/mdl_clients');

        $data = array(
            'invoice_groups' => $this->mdl_invoice_groups->get()->result(),
            'tax_rates' => $this->mdl_tax_rates->get()->result(),
            'client' => $this->mdl_clients->get_by_id($this->input->post('client_id')),
            'clients' => $this->mdl_clients->get_latest(),
        );
            
        $this->layout->load_view('invoices/modal_create_invoice', $data);
    }


    // public function modal_create_poinvoice()
    // {


    //     $this->load->module('layout');
    //     $this->load->model('invoice_groups/mdl_invoice_groups');
    //     $this->load->model('tax_rates/mdl_tax_rates');
    //     $this->load->model('clients/mdl_clients');

    //     $data = array(
    //         'invoice_groups' => $this->mdl_invoice_groups->get()->result(),
    //         'tax_rates' => $this->mdl_tax_rates->get()->result(),
    //         'client' => $this->mdl_clients->get_by_id($this->input->post('client_id')),
    //         'clients' => $this->mdl_clients->get_latest(),
    //     );
            
    //     $this->layout->load_view('invoices/modal_create_poinvoice', $data);
    // }


   public function test()
    {

        echo "erv";
        
       
    }


    public function modal_create_recurring()
    {
        $this->load->module('layout');

        $this->load->model('mdl_invoices_recurring');

        $data = array(
            'invoice_id' => $this->input->post('invoice_id'),
            'recur_frequencies' => $this->mdl_invoices_recurring->recur_frequencies
        );

        $this->layout->load_view('invoices/modal_create_recurring', $data);
    }

    public function get_recur_start_date()
    {
        $invoice_date = $this->input->post('invoice_date');
        $recur_frequency = $this->input->post('recur_frequency');

        echo increment_user_date($invoice_date, $recur_frequency);
    }

    public function modal_change_client()
    {
		$this->load->module('layout');
        $this->load->model('clients/mdl_clients');

        $data = array(
            'client_id' => $this->input->post('client_id'),
            'invoice_id' => $this->input->post('invoice_id'),
            'clients' => $this->mdl_clients->get_latest(),
        );
        
        $this->layout->load_view('invoices/modal_change_client', $data);
    }

    public function change_client()
    {
        $this->load->model('invoices/mdl_invoices');
        $this->load->model('clients/mdl_clients');

        // Get the client ID
        $client_id = $this->input->post('client_id');
        $client = $this->mdl_clients->where('ip_clients.client_id', $client_id)->get()->row();

        if (!empty($client)) {
            $invoice_id = $this->input->post('invoice_id');

            $db_array = array(
                'client_id' => $client_id,
            );
            $this->db->where('invoice_id', $invoice_id);
            $this->db->update('ip_invoices', $db_array);

            $response = array(
                'success' => 1,
                'invoice_id' => $invoice_id,
            );
        } else {
            $this->load->helper('json_error');
            $response = array(
                'success' => 0,
                'validation_errors' => json_errors()
            );
        }

        echo json_encode($response);
    }

    public function modal_copy_invoice()
    {
        $this->load->module('layout');

        $this->load->model('invoices/mdl_invoices');
        $this->load->model('invoice_groups/mdl_invoice_groups');
        $this->load->model('tax_rates/mdl_tax_rates');

        $data = array(
            'invoice_groups' => $this->mdl_invoice_groups->get()->result(),
            'tax_rates' => $this->mdl_tax_rates->get()->result(),
            'invoice_id' => $this->input->post('invoice_id'),
            'invoice' => $this->mdl_invoices->where('ip_invoices.invoice_id', $this->input->post('invoice_id'))->get()->row(),
        );

        $this->layout->load_view('invoices/modal_copy_invoice', $data);
    }

    public function copy_invoice()
    {
        $this->load->model('invoices/mdl_invoices');
        $this->load->model('invoices/mdl_items');
        $this->load->model('invoices/mdl_invoice_tax_rates');

        if ($this->mdl_invoices->run_validation()) {
            $target_id = $this->mdl_invoices->save();
            $source_id = $this->input->post('invoice_id');

            $this->mdl_invoices->copy_invoice($source_id, $target_id);

            $response = array(
                'success' => 1,
                'invoice_id' => $target_id
            );
        } else {
            $this->load->helper('json_error');
            $response = array(
                'success' => 0,
                'validation_errors' => json_errors()
            );
        }

        echo json_encode($response);
    }

    public function modal_create_credit()
    {
        $this->load->module('layout');

        $this->load->model('invoices/mdl_invoices');
        $this->load->model('invoice_groups/mdl_invoice_groups');
        $this->load->model('tax_rates/mdl_tax_rates');

        $data = array(
            'invoice_groups' => $this->mdl_invoice_groups->get()->result(),
            'tax_rates' => $this->mdl_tax_rates->get()->result(),
            'invoice_id' => $this->input->post('invoice_id'),
            'invoice' => $this->mdl_invoices->where('ip_invoices.invoice_id', $this->input->post('invoice_id'))->get()->row()
        );

        $this->layout->load_view('invoices/modal_create_credit', $data);
    }

    public function create_credit()
    {
        $this->load->model('invoices/mdl_invoices');
        $this->load->model('invoices/mdl_items');
        $this->load->model('invoices/mdl_invoice_tax_rates');

        if ($this->mdl_invoices->run_validation()) {
            $target_id = $this->mdl_invoices->save();
            $source_id = $this->input->post('invoice_id');

            $this->mdl_invoices->copy_credit_invoice($source_id, $target_id);

            $sourceinv_array= array('is_read_only'=>'1','invoice_status_id'=>'2');

            // Set source invoice to read-only
            if ($this->config->item('disable_read_only') == false) {
                $this->mdl_invoices->where('invoice_id', $source_id);
                $this->mdl_invoices->update('ip_invoices', $sourceinv_array);
            }

            // Set target invoice to credit invoice
            $this->mdl_invoices->where('invoice_id', $target_id);
            $this->mdl_invoices->update('ip_invoices', array('creditinvoice_parent_id' => $source_id));

            $this->mdl_invoices->where('invoice_id', $target_id);
            $this->mdl_invoices->update('ip_invoice_amounts', array('invoice_sign' => '-1'));

            $response = array(
                'success' => 1,
                'invoice_id' => $target_id
            );
        } else {
            $this->load->helper('json_error');
            $response = array(
                'success' => 0,
                'validation_errors' => json_errors()
            );
        }

        echo json_encode($response);
    }

}