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Filename : ProductBundleItem.php

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<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class ProductBundleItem extends Model
{
    protected $fillable = [
        'bundle_id',
        'product_id',
        'quantity',
    ];

    protected $casts = [
        'quantity' => 'integer',
    ];

    /**
     * Get the bundle this item belongs to
     */
    public function bundle(): BelongsTo
    {
        return $this->belongsTo(ProductBundle::class, 'bundle_id');
    }

    /**
     * Get the product
     */
    public function product(): BelongsTo
    {
        return $this->belongsTo(Product::class, 'product_id');
    }

    /**
     * Get item total price
     */
    public function getTotalPrice(): float
    {
        if (!$this->product) {
            return 0;
        }
        return $this->product->unit_price * $this->quantity;
    }
}