Extending Discounts

use Lunar\Facades\Discounts;

Discounts::addType(MyCustomDiscountType::class);

<?php

namespace App\DiscountTypes;

use Lunar\Models\Cart;
use Lunar\DiscountTypes\AbstractDiscountType;

class MyCustomDiscountType extends AbstractDiscountType
{
    /**
     * Return the name of the discount.
     *
     * @return string
     */
    public function getName(): string
    {
        return 'Custom Discount Type';
    }

    /**
     * Called just before cart totals are calculated.
     *
     * @return Cart
     */
    public function apply(Cart $cart): Cart
    {
        // ...
        return $cart;
    }
}

<?php

namespace App\DiscountTypes;

use Lunar\Admin\Base\LunarPanelDiscountInterface;
use Lunar\DiscountTypes\AbstractDiscountType;
use Filament\Forms;

class MyCustomDiscountType extends AbstractDiscountType implements LunarPanelDiscountInterface
{
    /**
     * Return the schema to use in the Lunar admin panel
     */
    public function lunarPanelSchema(): array
    {
        return [
            Forms\Components\TextInput::make('data.my_field')
               ->label('My label')
               ->required(),
        ];
    }

    /**
     * Mutate the model data before displaying it in the admin form.
     */
    public function lunarPanelOnFill(array $data): array
    {
        // optionally do something with $data
        return $data;
    }

    /**
     * Mutate the form data before saving it to the discount model.
     */
    public function lunarPanelOnSave(array $data): array
    {
        // optionally do something with $data
        return $data;
    }
}