Work on products, first completed broadband

app/Models/Tax.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Database\Eloquent\Model;
 
 class Tax extends Model
@@ -14,4 +15,30 @@ class Tax extends Model
 	{
 		return $this->belongsTo(Country::class);
 	}
+
+	/* METHODS */
+
+	/**
+	 * Calculate Tax on a value
+	 *
+	 * @param float $value
+	 * @param Collection $taxes
+	 * @return void
+	 */
+	public static function tax_calc(?float $value,Collection $taxes): float
+	{
+		if (! $value)
+			$value = 0;
+		$tax = 0;
+
+		foreach ($taxes as $o) {
+			// Quick sanity check
+			if (! $o instanceof self)
+				abort(500,'Invalid object for tax calculation');
+
+			$tax += round($value*$o->rate,2);
+		}
+
+		return round($value+$tax,2);
+	}
 }