Add math calculator. Revise Rateable interface

docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3.1"
 services:
   php-cli:
     build: .docker

src/Freemium/Event/DomainEvent.php → src/Freemium/Application/Event/DomainEvent.php

@@ -2,10 +2,12 @@
 
 declare(strict_types=1);
 
-namespace Freemium\Event;
+namespace Freemium\Application\Event;
 
 abstract class DomainEvent
 {
+    public const NAME = 'default';
+
     public function getName(): string
     {
         return static::NAME;

src/Freemium/Event/EventProvider.php → src/Freemium/Application/Event/EventProvider.php

@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace Freemium\Event;
+namespace Freemium\Application\Event;
 
 class EventProvider
 {

src/Freemium/Command/AbstractCommandHandler.php → src/Freemium/Application/UseCase/AbstractCommandHandler.php

@@ -1,8 +1,8 @@
 <?php
 
-namespace Freemium\Command;
+namespace Freemium\Application\UseCase;
 
-use Freemium\Event\EventProvider;
+use Freemium\Application\Event\EventProvider;
 
 abstract class AbstractCommandHandler
 {
@@ -13,7 +13,7 @@ public function __construct(EventProvider $eventProvider)
         $this->eventProvider = $eventProvider;
     }
 
-    public function getEventProvider()
+    public function getEventProvider(): EventProvider
     {
         return $this->eventProvider;
     }

src/Freemium/Command/ChangePlan/ChangePlan.php → src/Freemium/Application/UseCase/ChangePlan/ChangePlan.php

@@ -2,10 +2,10 @@
 
 declare(strict_types=1);
 
-namespace Freemium\Command\ChangePlan;
+namespace Freemium\Application\UseCase\ChangePlan;
 
-use Freemium\Subscription;
-use Freemium\SubscriptionPlan;
+use Freemium\Domain\Subscription;
+use Freemium\Domain\SubscriptionPlan;
 
 class ChangePlan
 {
@@ -21,12 +21,12 @@ public function __construct(
         $this->subscriptionPlan = $plan;
     }
 
-    public function getSubscriptionPlan()
+    public function getSubscriptionPlan(): SubscriptionPlan
     {
         return $this->subscriptionPlan;
     }
 
-    public function getSubscription()
+    public function getSubscription(): Subscription
     {
         return $this->subscription;
     }

src/Freemium/Command/ChangePlan/ChangePlanHandler.php → src/Freemium/Application/UseCase/ChangePlan/ChangePlanHandler.php

@@ -2,12 +2,12 @@
 
 declare(strict_types=1);
 
-namespace Freemium\Command\ChangePlan;
+namespace Freemium\Application\UseCase\ChangePlan;
 
 use Throwable;
-use Freemium\Event\EventProvider;
-use Freemium\Command\AbstractCommandHandler;
-use Freemium\Repository\SubscriptionRepository;
+use Freemium\Application\Event\EventProvider;
+use Freemium\Domain\Repository\SubscriptionRepository;
+use Freemium\Application\UseCase\AbstractCommandHandler;
 
 class ChangePlanHandler extends AbstractCommandHandler
 {

src/Freemium/Command/ChangePlan/Event/SubscriptionChanged.php → src/Freemium/Application/UseCase/ChangePlan/Event/SubscriptionChanged.php

@@ -2,10 +2,10 @@
 
 declare(strict_types=1);
 
-namespace Freemium\Command\ChangePlan\Event;
+namespace Freemium\Application\UseCase\ChangePlan\Event;
 
-use Freemium\Subscription;
-use Freemium\Event\DomainEvent;
+use Freemium\Domain\Subscription;
+use Freemium\Application\Event\DomainEvent;
 
 class SubscriptionChanged extends DomainEvent
 {

src/Freemium/Command/ChangePlan/Event/SubscriptionNotChanged.php → src/Freemium/Application/UseCase/ChangePlan/Event/SubscriptionNotChanged.php

@@ -2,12 +2,12 @@
 
 declare(strict_types=1);
 
-namespace Freemium\Command\ChangePlan\Event;
+namespace Freemium\Application\UseCase\ChangePlan\Event;
 
 use Throwable;
-use Freemium\Subscription;
-use Freemium\SubscriptionPlan;
-use Freemium\Event\DomainEvent;
+use Freemium\Domain\Subscription;
+use Freemium\Domain\SubscriptionPlan;
+use Freemium\Application\Event\DomainEvent;
 
 class SubscriptionNotChanged extends DomainEvent
 {

src/Freemium/Command/ChargeSubscription/ChargeSubscription.php → src/Freemium/Application/UseCase/ChargeSubscription/ChargeSubscription.php

@@ -2,9 +2,9 @@
 
 declare(strict_types=1);
 
-namespace Freemium\Command\ChargeSubscription;
+namespace Freemium\Application\UseCase\ChargeSubscription;
 
-use Freemium\Subscription;
+use Freemium\Domain\Subscription;
 
 class ChargeSubscription
 {

src/Freemium/Command/ChargeSubscription/ChargeSubscriptionHandler.php → src/Freemium/Application/UseCase/ChargeSubscription/ChargeSubscriptionHandler.php

@@ -2,13 +2,16 @@
 
 declare(strict_types=1);
 
-namespace Freemium\Command\ChargeSubscription;
+namespace Freemium\Application\UseCase\ChargeSubscription;
 
-use Freemium\Freemium;
-use Freemium\Event\EventProvider;
-use Freemium\Gateways\GatewayInterface;
-use Freemium\Command\AbstractCommandHandler;
-use Freemium\Repository\SubscriptionRepository;
+use RuntimeException;
+use Freemium\Domain\Subscription;
+use Freemium\Application\Event\DomainEvent;
+use Freemium\Application\Event\EventProvider;
+use Freemium\Domain\Gateways\GatewayInterface;
+use Freemium\Domain\Repository\SubscriptionRepository;
+use Freemium\Application\UseCase\AbstractCommandHandler;
+use Freemium\Application\UseCase\ChargeSubscription\Event\SubscriptionPayFailed;
 
 class ChargeSubscriptionHandler extends AbstractCommandHandler
 {
@@ -36,26 +39,48 @@ public function handle(ChargeSubscription $command): void
     {
         $subscription = $command->getSubscription();
 
+        if ($subscription->getSubscribable()->getBillingKey() === null) {
+            throw new RuntimeException('Customer does not have a billing key setup');
+        }
+
         $response = $this->gateway->charge(
             $subscription->rate(),
             $subscription->getSubscribable()->getBillingKey()
         );
 
         $transaction = $subscription->createTransaction($response);
 
-        $event = new Event\SubscriptionPaid($subscription);
         if ($transaction->isSuccess()) {
             $subscription->receivePayment();
-        } elseif ($subscription->isExpired()) {
+            $event = new Event\SubscriptionPaid($subscription);
+
+            $this->finalize($subscription, $event);
+            return;
+        }
+
+        if ($subscription->isExpired()) {
             $subscription->expireNow();
             $event = new Event\SubscriptionExpired($subscription);
-        } elseif (!$subscription->isInGrace()) {
+
+            $this->finalize($subscription, $event);
+            return;
+        }
+
+        if (!$subscription->isInGrace()) {
             $subscription->expireAfterGrace();
             $event = new Event\SubscriptionGraced($subscription);
+
+            $this->finalize($subscription, $event);
+            return;
         }
 
-        $this->repository->update($subscription);
+        $event = new SubscriptionPayFailed($subscription);
+        $this->finalize($subscription, $event);
+    }
 
+    private function finalize(Subscription $subscription, DomainEvent $event): void
+    {
+        $this->repository->update($subscription);
         $this->getEventProvider()->raise($event);
     }
 }

src/Freemium/Command/ChargeSubscription/Event/SubscriptionExpired.php → src/Freemium/Application/UseCase/ChargeSubscription/Event/SubscriptionExpired.php

@@ -2,10 +2,10 @@
 
 declare(strict_types=1);
 
-namespace Freemium\Command\ChargeSubscription\Event;
+namespace Freemium\Application\UseCase\ChargeSubscription\Event;
 
-use Freemium\Subscription;
-use Freemium\Event\DomainEvent;
+use Freemium\Domain\Subscription;
+use Freemium\Application\Event\DomainEvent;
 
 class SubscriptionExpired extends DomainEvent
 {

src/Freemium/Command/ChargeSubscription/Event/SubscriptionGraced.php → src/Freemium/Application/UseCase/ChargeSubscription/Event/SubscriptionGraced.php

@@ -2,10 +2,10 @@
 
 declare(strict_types=1);
 
-namespace Freemium\Command\ChargeSubscription\Event;
+namespace Freemium\Application\UseCase\ChargeSubscription\Event;
 
-use Freemium\Subscription;
-use Freemium\Event\DomainEvent;
+use Freemium\Domain\Subscription;
+use Freemium\Application\Event\DomainEvent;
 
 class SubscriptionGraced extends DomainEvent
 {

src/Freemium/Command/ChargeSubscription/Event/SubscriptionPaid.php → src/Freemium/Application/UseCase/ChargeSubscription/Event/SubscriptionPaid.php

@@ -2,10 +2,10 @@
 
 declare(strict_types=1);
 
-namespace Freemium\Command\ChargeSubscription\Event;
+namespace Freemium\Application\UseCase\ChargeSubscription\Event;
 
-use Freemium\Subscription;
-use Freemium\Event\DomainEvent;
+use Freemium\Domain\Subscription;
+use Freemium\Application\Event\DomainEvent;
 
 class SubscriptionPaid extends DomainEvent
 {

src/Freemium/Application/UseCase/ChargeSubscription/Event/SubscriptionPayFailed.php

@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Freemium\Application\UseCase\ChargeSubscription\Event;
+
+use Freemium\Domain\Subscription;
+use Freemium\Application\Event\DomainEvent;
+
+class SubscriptionPayFailed extends DomainEvent
+{
+    public const NAME = 'subscription.paid_failed';
+
+    private $subscription;
+
+    public function __construct(Subscription $subscription)
+    {
+        $this->subscription = $subscription;
+    }
+
+    public function getSubscription()
+    {
+        return $this->subscription;
+    }
+}

src/Freemium/Command/CommandBus.php → src/Freemium/Application/UseCase/CommandBus.php

@@ -2,9 +2,9 @@
 
 declare(strict_types=1);
 
-namespace Freemium\Command;
+namespace Freemium\Application\UseCase;
 
-use Freemium\Event\EventProvider;
+use Freemium\Application\Event\EventProvider;
 
 class CommandBus
 {
@@ -20,12 +20,12 @@ public function __construct(
         $this->eventProvider = $eventProvider;
     }
 
-    public function handle($command)
+    public function handle(object $command)
     {
         return $this->resolveHandler($command)->handle($command);
     }
 
-    private function resolveHandler($command)
+    private function resolveHandler(object $command)
     {
         $resolver = $this->resolver;
 

src/Freemium/Command/CreateSubscription/Event/SubscriptionCreated.php → src/Freemium/Application/UseCase/CreateSubscription/Event/SubscriptionCreated.php

@@ -1,9 +1,9 @@
 <?php
 
-namespace Freemium\Command\CreateSubscription\Event;
+namespace Freemium\Application\UseCase\CreateSubscription\Event;
 
-use Freemium\Subscription;
-use Freemium\Event\DomainEvent;
+use Freemium\Domain\Subscription;
+use Freemium\Application\Event\DomainEvent;
 
 class SubscriptionCreated extends DomainEvent
 {

src/Freemium/Application/UseCase/CreateSubscription/NewSubscription.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Freemium\Application\UseCase\CreateSubscription;
+
+class NewSubscription
+{
+    public function __construct(
+        private readonly string $customerId,
+        private readonly string $subscriptionPlan
+    ) {
+    }
+
+    public function getCustomerId(): string
+    {
+        return $this->customerId;
+    }
+
+    public function getSubscriptionPlan(): string
+    {
+        return $this->subscriptionPlan;
+    }
+}

src/Freemium/Application/UseCase/CreateSubscription/NewSubscriptionHandler.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Freemium\Application\UseCase\CreateSubscription;
+
+use Freemium\Domain\Subscription;
+use Freemium\Application\Event\EventProvider;
+use Freemium\Domain\Repository\SubscribableRepository;
+use Freemium\Domain\Repository\SubscriptionRepository;
+use Freemium\Application\UseCase\AbstractCommandHandler;
+use Freemium\Domain\Repository\SubscriptionPlanRepository;
+
+class NewSubscriptionHandler extends AbstractCommandHandler
+{
+    public function __construct(
+        EventProvider $eventProvider,
+        private readonly SubscriptionRepository $repository,
+        private readonly SubscribableRepository $subscribableRepository,
+        private readonly SubscriptionPlanRepository $subscriptionPlanRepository
+    ) {
+        parent::__construct($eventProvider);
+    }
+
+    public function handle(NewSubscription $command): void
+    {
+        $subscribable = $this->subscribableRepository->findByCustomerId($command->getCustomerId());
+        $subscriptionPlan = $this->subscriptionPlanRepository->findByName($command->getSubscriptionPlan());
+
+        $subscription = new Subscription(
+            $subscribable,
+            $subscriptionPlan
+        );
+
+        $this->repository->insert($subscription);
+
+        $this->getEventProvider()->raise(new Event\SubscriptionCreated($subscription));
+    }
+}