finish rewar points calculator

config/rewards.php

@@ -9,7 +9,7 @@
     | Specify which class to use for calculating reward points.
     |
     */
-    'reward_point_calculator' => \Dystcz\LunarRewards\Domain\Rewards\Actions\RewardPointsCalculator::class,
+    'reward_point_calculator' => \Dystcz\LunarRewards\Domain\Rewards\Calculators\RewardPointsCalculator::class,
 
     /*
     |--------------------------------------------------------------------------

src/Domain/Rewards/Calculators/RewardPointsCalculator.php

@@ -0,0 +1,79 @@
+<?php
+
+namespace Dystcz\LunarRewards\Domain\Rewards\Calculators;
+
+use Dystcz\LunarRewards\Domain\Rewards\Contracts\RewardPointsCalculator as RewardPointsCalculatorContract;
+use Illuminate\Support\Facades\Config;
+use Lunar\Models\Cart;
+use Lunar\Models\Order;
+
+class RewardPointsCalculator implements RewardPointsCalculatorContract
+{
+    protected int|float $coefficient;
+
+    protected Order|Cart $model;
+
+    /**
+     * {@inheritDoc}
+     */
+    public function __construct(Order|Cart $model)
+    {
+        $this->model = $model;
+
+        $this->setCoefficient(Config::get('lunar-rewards.reward_point_coefficient', 1));
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function calculate(): int
+    {
+        if (! $this->getModel()) {
+            throw new \Exception('No model set for calculating reward points.');
+        }
+
+        $currency = $this->getModel()->currency;
+        $exchangeRate = $currency->exchange_rate;
+        $subTotal = $this->getModel()->sub_total ?? $this->getModel()->subTotal ?? null;
+        $subTotalValue = $subTotal ? $subTotal->value : 0;
+        $coefficient = $this->getCoefficient();
+
+        $points = (int) round($subTotalValue * $exchangeRate * $coefficient / 100);
+
+        return $points;
+    }
+
+    /**
+     * Create a new instance of the calculator for the given model.
+     */
+    public static function for(Order|Cart $model): self
+    {
+        return new static($model);
+    }
+
+    /**
+     * Get the model on which the reward points are calculated.
+     */
+    public function getModel(): Order|Cart|null
+    {
+        return $this->model;
+    }
+
+    /**
+     * Set the coefficient for calculating reward points.
+     */
+    public function setCoefficient(int|float $coefficient): self
+    {
+        $this->coefficient = (float) $coefficient;
+
+        return $this;
+    }
+
+    /**
+     * Get the coefficient used for calculating reward points.
+     */
+    public function getCoefficient(): float
+    {
+        return $this->coefficient;
+    }
+}

src/Domain/Rewards/Contracts/RewardPointsCalculator.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Dystcz\LunarRewards\Domain\Rewards\Contracts;
+
+use Lunar\Models\Cart;
+use Lunar\Models\Order;
+
+interface RewardPointsCalculator
+{
+    /**
+     * Set the model on which the reward points are calculated.
+     */
+    public function __construct(Order|Cart $model);
+
+    /**
+     * Calculate the reward points for the given order.
+     */
+    public function calculate(): int;
+}

src/LunarRewardsServiceProvider.php

@@ -36,6 +36,14 @@ public function register(): void
             'lunar-rewards',
             fn () => new LunarRewards,
         );
+
+        $this->app->singleton(
+            \Dystcz\LunarRewards\Domain\Rewards\Contracts\RewardPointsCalculator::class,
+            fn () => new (Config::get(
+                'lunar-rewards.reward_point_calculator',
+                \Dystcz\LunarRewards\Domain\Rewards\Calculators\RewardPointsCalculator::class,
+            )),
+        );
     }
 
     /**