Implemented Layers for Infrastrucure, Domain and Application

.gitignore

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+/node_modules
+/public/hot
+/public/storage
+/storage/*.key
+/vendor
+.env
+.env.backup
+.phpunit.result.cache
+Homestead.json
+Homestead.yaml
+npm-debug.log
+yarn-error.log

README.md

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+<p align="center"><img src="https://res.cloudinary.com/dtfbvvkyp/image/upload/v1566331377/laravel-logolockup-cmyk-red.svg" width="400"></p>
+
+<p align="center">
+<a href="https://travis-ci.org/laravel/framework"><img src="https://travis-ci.org/laravel/framework.svg" alt="Build Status"></a>
+<a href="https://packagist.org/packages/laravel/framework"><img src="https://poser.pugx.org/laravel/framework/d/total.svg" alt="Total Downloads"></a>
+<a href="https://packagist.org/packages/laravel/framework"><img src="https://poser.pugx.org/laravel/framework/v/stable.svg" alt="Latest Stable Version"></a>
+<a href="https://packagist.org/packages/laravel/framework"><img src="https://poser.pugx.org/laravel/framework/license.svg" alt="License"></a>
+</p>
+
+## About Laravel
+
+Laravel is a web application framework with expressive, elegant syntax. We believe development must be an enjoyable and creative experience to be truly fulfilling. Laravel takes the pain out of development by easing common tasks used in many web projects, such as:
+
+- [Simple, fast routing engine](https://laravel.com/docs/routing).
+- [Powerful dependency injection container](https://laravel.com/docs/container).
+- Multiple back-ends for [session](https://laravel.com/docs/session) and [cache](https://laravel.com/docs/cache) storage.
+- Expressive, intuitive [database ORM](https://laravel.com/docs/eloquent).
+- Database agnostic [schema migrations](https://laravel.com/docs/migrations).
+- [Robust background job processing](https://laravel.com/docs/queues).
+- [Real-time event broadcasting](https://laravel.com/docs/broadcasting).
+
+Laravel is accessible, powerful, and provides tools required for large, robust applications.
+
+## Learning Laravel
+
+Laravel has the most extensive and thorough [documentation](https://laravel.com/docs) and video tutorial library of all modern web application frameworks, making it a breeze to get started with the framework.
+
+If you don't feel like reading, [Laracasts](https://laracasts.com) can help. Laracasts contains over 1500 video tutorials on a range of topics including Laravel, modern PHP, unit testing, and JavaScript. Boost your skills by digging into our comprehensive video library.
+
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+
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+## Contributing
+
+Thank you for considering contributing to the Laravel framework! The contribution guide can be found in the [Laravel documentation](https://laravel.com/docs/contributions).
+
+## Code of Conduct
+
+In order to ensure that the Laravel community is welcoming to all, please review and abide by the [Code of Conduct](https://laravel.com/docs/contributions#code-of-conduct).
+
+## Security Vulnerabilities
+
+If you discover a security vulnerability within Laravel, please send an e-mail to Taylor Otwell via [[email protected]](mailto:[email protected]). All security vulnerabilities will be promptly addressed.
+
+## License
+
+The Laravel framework is open-sourced software licensed under the [MIT license](https://opensource.org/licenses/MIT).

app/Application/CreateEbook/CreateEbook.php

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+<?php
+
+namespace App\Application\CreateEbook;
+
+
+final class CreateEbook
+{
+  private $name;
+  private $price;
+  public function __construct(string  $name, int $price)
+  {
+    $this->name = $name;
+    $this->price = $price;
+  }
+
+  public function name(): string
+  {
+    return $this->name;
+  }
+  public function price(): int
+  {
+    return $this->price;
+  }
+}

app/Application/CreateEbook/CreateEbookService.php

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+<?php
+
+namespace App\Application\CreateEbook;
+
+use App\Domain\Ebook\Ebook;
+use App\Domain\Ebook\EbookId;
+use App\Domain\Ebook\EbookRepository;
+
+final class CreateEbookService
+{
+  private $ebookRepository;
+  public function __construct(EbookRepository $ebookRepository)
+  {
+    $this->ebookRepository = $ebookRepository;
+  }
+  public function addEbookAction(CreateEbook $createEbook): EbookId
+  {
+    $ebookId = $this->ebookRepository->identity();
+    $ebook = new Ebook(
+      $ebookId,
+      $createEbook->name(),
+      $createEbook->price()
+    );
+    $this->ebookRepository->save($ebook);
+    return $ebookId;
+  }
+}

app/Application/CreateOrder/CreateOrder.php

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+<?php
+
+namespace App\Application\CreateOrder;
+
+
+final class CreateOrder
+{
+  private $ebookId;
+  private $orderQuantity;
+  private $emailAddress;
+  public function __construct(string  $ebookId, int $quantity,  string $email_address)
+  {
+    $this->ebookId = $ebookId;
+    $this->orderQuantity = $quantity;
+    $this->emailAddress = $email_address;
+  }
+  public function ebookId(): string
+  {
+    return $this->ebookId;
+  }
+  public function orderQuantity(): int
+  {
+    return $this->orderQuantity;
+  }
+  public function emailAddress(): string
+  {
+    return $this->emailAddress;
+  }
+}

app/Application/CreateOrder/CreateOrderService.php

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+<?php
+
+namespace App\Application\CreateOrder;
+
+use App\Domain\Ebook\EbookId;
+use App\Domain\Ebook\EbookRepository;
+use App\Domain\Order\Order;
+use App\Domain\Order\OrderId;
+use App\Domain\Order\OrderRepository;
+
+final class CreateOrderService
+{
+  private $orderRepository;
+  private $ebookRepository;
+
+  public function __construct(OrderRepository $orderRepository, EbookRepository $ebookRepository)
+  {
+    $this->orderRepository = $orderRepository;
+    $this->ebookRepository = $ebookRepository;
+  }
+
+  public function create(CreateOrder $createOrder): OrderId
+  {
+    $ebook = $this->ebookRepository->getById(EbookId::fromString($createOrder->ebookId()));
+    $orderAmount = (int) $createOrder->orderQuantity() * (int) $ebook->price();
+    $orderId = $this->orderRepository->identity();
+    $order = new Order(
+      $orderId,
+      $createOrder->emailAddress(),
+      $createOrder->orderQuantity(),
+      $orderAmount
+    );
+    $this->orderRepository->save($order);
+    return $orderId;
+  }
+}

app/Application/ListAvailableEbooks/Ebook.php

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+<?php
+
+namespace App\Application\ListAvailableEbooks;
+
+use App\Domain\Ebook\EbookId;
+
+final class Ebook
+{
+  private $id;
+  private $name;
+  private $price;
+  public function __construct(EbookId $id, string $name, int $price)
+  {
+    $this->name = $name;
+    $this->price = $price;
+    $this->id = $id;
+  }
+  public function ebookId(): string
+  {
+    return $this->id->asString();
+  }
+  public function title(): string
+  {
+    return $this->name;
+  }
+  public function price(): string
+  {
+    return Price::fromInt($this->price)->asFormattedAmount();
+  }
+}

app/Application/ListAvailableEbooks/ListEBooksRepository.php

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+<?php
+
+namespace App\Application\ListAvailableEbooks;
+
+
+interface ListEBooksRepository
+{
+  /**
+   * @return array<Ebook>
+   */
+  public function listAvailableEbooks(): array;
+}

app/Application/ListAvailableEbooks/Price.php

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+<?php
+
+namespace App\Application\ListAvailableEbooks;
+
+final class Price
+{
+  private $priceInCents;
+  private function __construct(int $priceInCents)
+  {
+    $this->priceInCents = $priceInCents;
+  }
+  public static function fromInt(int $priceInCents): self
+  {
+    return new self($priceInCents);
+  }
+  public function asInt(): int
+  {
+    return $this->priceInCents;
+  }
+
+  public function asFormattedAmount(): string
+  {
+    return strval($this->priceInCents);
+  }
+}

app/Application/ShowSingleEbook/GetEbookRepository.php

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+<?php
+
+namespace App\Application\ShowSingleEbook;
+
+use App\Application\ListAvailableEbooks\Ebook;
+use App\Domain\Ebook\EbookId;
+
+interface GetEbookRepository
+{
+  public function getEbook(EbookId $ebookId): Ebook;
+}

app/Console/Kernel.php

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+<?php
+
+namespace App\Console;
+
+use Illuminate\Console\Scheduling\Schedule;
+use Illuminate\Foundation\Console\Kernel as ConsoleKernel;
+
+class Kernel extends ConsoleKernel
+{
+    /**
+     * The Artisan commands provided by your application.
+     *
+     * @var array
+     */
+    protected $commands = [
+        //
+    ];
+
+    /**
+     * Define the application's command schedule.
+     *
+     * @param  \Illuminate\Console\Scheduling\Schedule  $schedule
+     * @return void
+     */
+    protected function schedule(Schedule $schedule)
+    {
+        // $schedule->command('inspire')->hourly();
+    }
+
+    /**
+     * Register the commands for the application.
+     *
+     * @return void
+     */
+    protected function commands()
+    {
+        $this->load(__DIR__.'/Commands');
+
+        require base_path('routes/console.php');
+    }
+}

app/Domain/Ebook/Ebook.php

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+<?php
+
+namespace App\Domain\Ebook;
+
+use Assert\Assertion;
+
+final class Ebook
+{
+  private $id;
+  private $name;
+  private $discount;
+  private $price;
+  public function __construct(EbookId $id, string $name, int $price)
+  {
+    Assertion::greaterThan($price, 0);
+    $this->name = $name;
+    $this->price = $price;
+    $this->id = $id;
+    $this->discount = 0;
+  }
+
+  public function mappedData()
+  {
+    return [
+      'uuid' => $this->id->asString(),
+      'name' => $this->name,
+      'price' => $this->price,
+      'discount' => $this->discount,
+    ];
+  }
+
+  public function addDiscount(int $discount)
+  {
+    $this->discount = $discount;
+  }
+}