wip

app/Filament/Company/Resources/Sales/InvoiceResource/Widgets/InvoiceOverview.php

 
         $totalValidInvoiceCount = $validInvoices->count();
 
-        $averageInvoiceTotal = $totalValidInvoiceCount > 0 ? $totalValidInvoiceAmount / $totalValidInvoiceCount : 0;
+        $averageInvoiceTotal = $totalValidInvoiceCount > 0
+            ? (int) round($totalValidInvoiceAmount / $totalValidInvoiceCount)
+            : 0;
 
         $averagePaymentTime = $this->getPageTableQuery()
             ->whereNotNull('paid_at')

app/Models/Accounting/Account.php

         return self::where('name', 'Accounts Payable')->firstOrFail();
     }
 
+    public static function getSalesDiscountAccount(): self
+    {
+        return self::where('name', 'Sales Discount')->firstOrFail();
+    }
+
     protected static function newFactory(): Factory
     {
         return AccountFactory::new();

app/Models/Accounting/Invoice.php

 use App\Filament\Company\Resources\Sales\InvoiceResource;
 use App\Models\Common\Client;
 use App\Observers\InvoiceObserver;
+use App\Utilities\Currency\CurrencyConverter;
 use Filament\Actions\Action;
 use Filament\Actions\MountableAction;
 use Filament\Actions\ReplicateAction;
             'description' => $baseDescription,
         ]);
 
-        foreach ($this->lineItems as $lineItem) {
+        $totalLineItemSubtotal = (int) $this->lineItems()->sum('subtotal');
+        $invoiceDiscountTotalCents = (int) $this->getRawOriginal('discount_total');
+        $remainingDiscountCents = $invoiceDiscountTotalCents;
+
+        foreach ($this->lineItems as $index => $lineItem) {
             $lineItemDescription = "{$baseDescription} › {$lineItem->offering->name}";
 
             $transaction->journalEntries()->create([
                     'description' => $lineItemDescription,
                 ]);
             }
+
+            if ($this->discount_method === 'invoice' && $totalLineItemSubtotal > 0) {
+                $lineItemSubtotalCents = (int) $lineItem->getRawOriginal('subtotal');
+
+                if ($index === $this->lineItems->count() - 1) {
+                    $lineItemDiscount = $remainingDiscountCents;
+                } else {
+                    $lineItemDiscount = (int) round(
+                        ($lineItemSubtotalCents / $totalLineItemSubtotal) * $invoiceDiscountTotalCents
+                    );
+                    $remainingDiscountCents -= $lineItemDiscount;
+                }
+
+                if ($lineItemDiscount > 0) {
+                    $transaction->journalEntries()->create([
+                        'company_id' => $this->company_id,
+                        'type' => JournalEntryType::Debit,
+                        'account_id' => Account::getSalesDiscountAccount()->id,
+                        'amount' => CurrencyConverter::convertCentsToFormatSimple($lineItemDiscount),
+                        'description' => "{$lineItemDescription} (Proportional Discount)",
+                    ]);
+                }
+            }
         }
     }