public function store(Request $request) {
        $input = $request->all();
        $this->validate($request, [
            'date' => 'required',
            'due_date' => 'required',
        ]);

        $invoice = Invoice::latest()->first();
        $invoiceArr = explode('-', $invoice->invoice_number);


        if ( empty(invoiceArr[0]) ){
            $nextInvoiceNumber = 'INV-'.date('Y').'-0001';
        } else {
            //increase 1 with last invoice number
            $nextInvoiceNumber = $invoiceArr[0].'-'.$invoiceArr[1].'-'. $invoiceArr[2]+1;
        }
//add y

        $invoice = new Invoice;
        $invoice->company_id = $request->input('company_id');
        $invoice->date = $request->input('date');
        $invoice->due_date = $request->input('due_date');
        $invoice->number = $nextInvoiceNumber;
        $invoice->terms = $request->input('terms');
        $invoice->user_id = Auth()->user()->id;
        $invoice->payment = $request->input('payment');
        $invoice->sub = $request->input('subhidden');
        $invoice->vat = $request->input('vathidden');
        $invoice->grand= $request->input('grandhidden');

        if($invoice->save()) {
            $inserted_id = $invoice->id;
            for ($i=0; $i < count($input['description']); $i++) {
                $invoice_list = new Invoice_list;
                $invoice_list->desc = $input['description'][$i];
                $invoice_list->qty = $input['qty'][$i];
                $invoice_list->price = $input['price'][$i];
                $invoice_list->amount = $input['amount'][$i];
                $invoice_list->invoice_id = $inserted_id;
                $invoice_list->save();
            }
        }
        return redirect('/invoices');
    }