public function store(CreateInvoiceRequest $request)
 {
     $user_id = Session::get('user_id');
     $user = User::where('id', $user_id)->first();
     $invoice = $user->invoice()->create($request->all());
     $user_balance = $user->balance;
     if ($user->balance != 0) {
         session()->flash('flash_message', 'Your invoice has been created successfully! The amount minus user balance is: ' . ($request->amount - $user->balance));
         $user->balance = 0;
         if ($user->save()) {
             $discount_invoice = new App\Invoice();
             $discount_invoice->name = 'Paid from your balance for ' . $request->name;
             $discount_invoice->amount = $user_balance * -1;
             $discount_invoice->user()->associate($user);
             $discount_invoice->save();
         }
     } else {
         session()->flash('flash_message', 'Your invoice has been created successfully!');
     }
     $first_root_id = $user->root_id;
     if ($first_root_id !== null) {
         $first_root = User::where('id', $first_root_id)->first();
         $commission_amount = $request->amount * 0.1;
         $commission = new App\Commission();
         $commission->user()->associate($first_root);
         $commission->invoice()->associate($invoice);
         $commission->amount = $commission_amount;
         $commission->save();
         $first_root->balance += $commission_amount;
         $first_root->save();
         if ($first_root->root_id !== null) {
             $second_root = User::where('id', $first_root->root_id)->first();
             $commission_amount = $request->amount * 0.05;
             $commission = new App\Commission();
             $commission->invoice()->associate($invoice);
             $commission->user()->associate($second_root);
             $commission->amount = $commission_amount;
             $commission->save();
             $second_root->balance += $commission_amount;
             $second_root->save();
             if ($second_root->root_id !== null) {
                 $third_root = User::where('id', $second_root->root_id)->first();
                 $commission_amount = $request->amount * 0.02;
                 $commission = new App\Commission();
                 $commission->invoice()->associate($invoice);
                 $commission->user()->associate($third_root);
                 $commission->amount = $commission_amount;
                 $commission->save();
                 $third_root->balance += $commission_amount;
                 $third_root->save();
             }
         }
     }
     $invoices = Invoice::latest()->get()->take(5);
     return view('admin', compact('invoices'));
 }