Merx – Plugin to create online shops with Kirby 3

Plugins Kirby 3 plugin 🧩
202

I’m gonna try and tinker with the ww.merx.cart hook a litte

That’s basically what I did with this shop:
https://www.desinfektionsmittel-gww.de/kasse

The user can add a promo code („Rabatt-Code“). The checkPromoCode() function checks the code and stores it in the session. The updatePromoCode() functions calculates the discount. Additionally updatePromoCode() is called every time the cart is returned to the user (within the returnCart() function).

// site/config/config.php

function checkPromoCode(string $promoCode): bool
{
  $kirby = kirby();
  $site = $kirby->site();
  $discountPage = $site->discount()->toPage();
  $session = $kirby->session();
  if ($discountPage
    && $promoCode === $discountPage->content()->code()->toString()) {
    $session->set('promo-code', $promoCode);
    return true;
  } else {
    throw new Exception([
     'httpCode' => 400,
     'key' => 'validation.promoCode',
    ]);
  }
}

function updatePromoCode(Wagnerwagner\Merx\Cart $cart): void
{
  $kirby = kirby();
  $site = $kirby->site();
  $session = $kirby->session();
  $promoCode = $session->get('promo-code', false);
  $discountPage = $site->discount()->toPage();

  // Always remove discount
  $cart->remove('discount');

  // Check quantity of cart
  $quantity = 0.0;
  $shippingSum = 0.0;
  foreach ($cart->data() as $item) {
    $itemPage = page($item['id']);
    if ($itemPage && !in_array($itemPage->type()->toString(), ['shipping', 'discount'])) {
      $quantity += (float)$item['quantity'];
    }
    if ($itemPage->type()->toString() === 'shipping') {
      $shippingSum += $item['sum'];
    }
  }

  if ($promoCode
    && $quantity > 0.0
    && $discountPage
    && $promoCode === $discountPage->content()->code()->toString()) {
    $price = (($cart->getSum() - $shippingSum) / 100 * $discountPage->discount()->toFloat()) * -1;
    $cart->add([
      'id' => 'discount',
      'price' => $price,
    ]);
  }

  // remove promo-code if cart is empty
  if ($quantity === 0.0) {
    $session->remove('promo-code');
  }
}

return [
  'hooks' => [
    'ww.merx.cart' => function ($cart) {
      updatePromoCode($cart);
    },
  ],
  'routes' => [
    [
      'method' => 'POST',
      'pattern' => 'shop-api/promo-code',
      'action' => function()
      {
        try {
          $cart = cart();
          $promoCode = Str::trim(get('promocode'));
          if (checkPromoCode($promoCode)) {
            updatePromoCode($cart);
          }
          return Response::json(returnCart($cart));
       }
    ],
    [
      'method' => 'DELETE',
      'pattern' => 'shop-api/promo-code',
      'action' => function()
      {
        kirby()->session()->remove('promo-code');
        $cart = cart();
        return Response::json(returnCart($cart)); 
      },
    ],
    [
      'method' => 'GET',
      'pattern' => 'shop-api/cart',
      'action'  => function()
      {
        $cart = cart();
        return Response::json(returnCart($cart)); 
      }
    ],
  ],
];
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