invoice update

app/Models/Invoice.php

@@ -0,0 +1,77 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Invoice extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'order_id',
+        'customer_id',
+        'mark_no',
+
+        'invoice_number',
+        'invoice_date',
+        'due_date',
+
+        'payment_method',
+        'reference_no',
+        'status',
+
+        'final_amount',
+        'gst_percent',
+        'gst_amount',
+        'final_amount_with_gst',
+
+        'customer_name',
+        'company_name',
+        'customer_email',
+        'customer_mobile',
+        'customer_address',
+        'pincode',
+
+        'pdf_path',
+        'notes',
+    ];
+
+    /****************************
+     * Relationships
+     ****************************/
+
+    public function items()
+    {
+        return $this->hasMany(InvoiceItem::class)->orderBy('id', 'ASC');
+    }
+
+    public function order()
+    {
+        return $this->belongsTo(Order::class);
+    }
+
+    public function customer()
+    {
+        return $this->belongsTo(User::class, 'customer_id');
+    }
+
+    /****************************
+     * Helper Functions
+     ****************************/
+
+    // Auto calculate GST fields (you can call this in controller before saving)
+    public function calculateTotals()
+    {
+        $gst = ($this->final_amount * $this->gst_percent) / 100;
+        $this->gst_amount = $gst;
+        $this->final_amount_with_gst = $this->final_amount + $gst;
+    }
+
+    // Check overdue status condition
+    public function isOverdue()
+    {
+        return $this->status === 'pending' && now()->gt($this->due_date);
+    }
+}