[ECP-9289] Adding Installament options in payment Links request databuilder. (#3232)

Author: khushboo-singhvi

Gateway/Request/InstallmentOptionsDataBuilder.php

@@ -0,0 +1,160 @@
+<?php
+
+namespace Adyen\Payment\Gateway\Request;
+
+use Adyen\Payment\Helper\Config;
+use Adyen\Payment\Helper\Data as AdyenDataHelper;
+use Magento\Framework\Serialize\SerializerInterface;
+use Magento\Payment\Gateway\Data\PaymentDataObject;
+use Magento\Payment\Gateway\Helper\SubjectReader;
+use Magento\Payment\Gateway\Request\BuilderInterface;
+use Magento\Store\Model\StoreManagerInterface;
+
+class InstallmentOptionsDataBuilder implements BuilderInterface
+{
+    public function __construct(
+        private readonly Config $configHelper,
+        private readonly SerializerInterface $serializer,
+        private readonly StoreManagerInterface $storeManager,
+        private readonly AdyenDataHelper $adyenHelper
+    ) {
+    }
+
+    public function build(array $buildSubject): array
+    {
+        /** @var PaymentDataObject $paymentDataObject */
+        $paymentDataObject = SubjectReader::readPayment($buildSubject);
+        $orderAmount = $paymentDataObject->getOrder()->getGrandTotalAmount();
+
+        $storeId = $this->storeManager->getStore()->getId();
+
+        if (!$this->configHelper->getAdyenCcConfigData('enable_installments', $storeId)) {
+            return [];
+        }
+
+        $raw = $this->configHelper->getAdyenCcConfigData('installments', $storeId);
+        if (empty($raw)) {
+            return [];
+        }
+
+        $installmentsConfig = $this->serializer->unserialize($raw);
+
+        $installmentOptions = $this->formatInstallmentOptions($installmentsConfig, $orderAmount);
+
+        return empty($installmentOptions)
+            ? []
+            : ['body' => ['installmentOptions' => $installmentOptions]];
+    }
+
+    private function formatInstallmentOptions(array $config, float $orderAmount): array
+    {
+        $brandMap = $this->getBrandMapFromXml();
+        $result = [];
+
+        foreach ($config as $brandCode => $rules) {
+            $pm = $brandMap[$brandCode] ?? null;
+            if (!$pm || !is_array($rules)) {
+                continue;
+            }
+
+            $thresholds = $this->parseThresholds($rules);
+            if (!$thresholds) {
+                continue;
+            }
+
+            $values = $this->collectEligibleValues($thresholds, $orderAmount);
+
+            $values[] = 1;
+
+            $values = array_values(array_unique(array_filter($values, static fn($v) => $v > 0)));
+            sort($values, SORT_NUMERIC);
+
+            if ($values) {
+                $result[$pm] = ['values' => $values];
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Converts config rules into a sorted map: [minAmount(float) => values(int[])]
+     * Accepts common shapes:
+     * - [minAmount => [2,3]]
+     * - [minAmount => ['values' => [2,3]]]
+     * - [minAmount => 3]
+     */
+    private function parseThresholds(array $rules): array
+    {
+        $thresholds = [];
+
+        foreach ($rules as $minAmount => $installments) {
+            $values = $this->normalizeInstallmentValues($installments);
+            if (!$values) {
+                continue;
+            }
+
+            $thresholds[(float)$minAmount] = $values;
+        }
+
+        if (!$thresholds) {
+            return [];
+        }
+
+        ksort($thresholds, SORT_NUMERIC);
+        return $thresholds;
+    }
+
+    private function collectEligibleValues(array $thresholds, float $orderAmount): array
+    {
+        $values = [];
+
+        foreach ($thresholds as $minAmount => $tierValues) {
+            if ($orderAmount < (float)$minAmount) {
+                break;
+            }
+            // Append values from each eligible tier
+            $values = array_merge($values, $tierValues);
+        }
+
+        return $values;
+    }
+
+    private function normalizeInstallmentValues(mixed $installments): array
+    {
+        // If admin config stores something like ['values' => [2,3]]
+        if (is_array($installments) && isset($installments['values']) && is_array($installments['values'])) {
+            $installments = $installments['values'];
+        }
+
+        if (is_numeric($installments)) {
+            return [(int)$installments];
+        }
+
+        if (is_array($installments)) {
+            $out = [];
+            foreach ($installments as $v) {
+                if (is_numeric($v)) {
+                    $out[] = (int)$v;
+                }
+            }
+            return $out;
+        }
+
+        return [];
+    }
+
+    private function getBrandMapFromXml(): array
+    {
+        $altData = $this->adyenHelper->getCcTypesAltData();
+
+        $map = [];
+        foreach ($altData as $altCode => $data) {
+            if (!empty($data['code'])) {
+                $map[$data['code']] = $altCode;
+            }
+        }
+
+        return $map;
+    }
+}