chore: initial commit of existing codebase

app/Models/SalesInvoice.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class SalesInvoice extends Model
+{
+    use HasFactory;
+
+    protected $fillable = ['invoice_number', 'sales_order_id', 'customer_id', 'invoice_date', 'due_date', 'subtotal', 'vat_rate', 'vat_amount', 'total_amount', 'paid_amount', 'status', 'notes', 'created_by'];
+
+    protected $casts = [
+        'invoice_date' => 'date',
+        'due_date' => 'date',
+        'subtotal' => 'decimal:2',
+        'vat_rate' => 'decimal:2',
+        'vat_amount' => 'decimal:2',
+        'total_amount' => 'decimal:2',
+        'paid_amount' => 'decimal:2',
+    ];
+
+    public function salesOrder()
+    {
+        return $this->belongsTo(SalesOrder::class);
+    }
+
+    public function customer()
+    {
+        return $this->belongsTo(Customer::class);
+    }
+
+    public function paymentReceipts()
+    {
+        return $this->hasMany(PaymentReceipt::class);
+    }
+
+    public function createdBy()
+    {
+        return $this->belongsTo(\App\Models\User::class, 'created_by');
+    }
+
+    public function getOutstandingAttribute()
+    {
+        return $this->total_amount - $this->paid_amount;
+    }
+}