feat: GetPage endpoint

tests/Domain/Reader/Adapter/InMemoryChapterRepository.php

@@ -0,0 +1,121 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Domain\Reader\Adapter;
+
+use App\Domain\Reader\Domain\Contract\Repository\ChapterRepositoryInterface;
+use App\Domain\Reader\Domain\Exception\ChapterNotFoundException;
+use App\Domain\Reader\Domain\Exception\PageNotFoundException;
+use App\Domain\Reader\Domain\Model\ChapterContext;
+use App\Domain\Reader\Domain\Model\Page;
+use App\Domain\Reader\Domain\Model\PageContent;
+use App\Domain\Reader\Domain\ValueObject\ChapterId;
+use App\Domain\Reader\Domain\ValueObject\PageNumber;
+
+final class InMemoryChapterRepository implements ChapterRepositoryInterface
+{
+    /** @var array<string, array{pages: array<Page>, context: ChapterContext}> */
+    private array $chapters = [];
+
+    public function addChapter(ChapterId $chapterId, ChapterContext $context, array $pages): void
+    {
+        $this->chapters[$chapterId->getValue()] = [
+            'pages' => $pages,
+            'context' => $context
+        ];
+    }
+
+    public function getPagesForChapter(ChapterId $chapterId, int $page = 1, int $itemsPerPage = 20): array
+    {
+        if (!isset($this->chapters[$chapterId->getValue()])) {
+            return [];
+        }
+
+        $pages = $this->chapters[$chapterId->getValue()]['pages'];
+        $offset = ($page - 1) * $itemsPerPage;
+
+        return array_slice($pages, $offset, $itemsPerPage);
+    }
+
+    public function getChapterContext(ChapterId $chapterId): ChapterContext
+    {
+        if (!isset($this->chapters[$chapterId->getValue()])) {
+            throw ChapterNotFoundException::forChapter($chapterId);
+        }
+
+        return $this->chapters[$chapterId->getValue()]['context'];
+    }
+
+    public function getTotalPagesForChapter(ChapterId $chapterId): int
+    {
+        if (!isset($this->chapters[$chapterId->getValue()])) {
+            return 0;
+        }
+
+        return count($this->chapters[$chapterId->getValue()]['pages']);
+    }
+
+    public function getPreviousChapterId(ChapterId $chapterId): ?ChapterId
+    {
+        $currentChapter = $this->getChapterContext($chapterId);
+        $currentNumber = $currentChapter->getNumber();
+
+        $previousChapter = null;
+        $previousNumber = 0.0;
+
+        foreach ($this->chapters as $id => $chapter) {
+            $number = $chapter['context']->getNumber();
+            if ($number < $currentNumber && $number > $previousNumber) {
+                $previousChapter = $id;
+                $previousNumber = $number;
+            }
+        }
+
+        return $previousChapter ? new ChapterId($previousChapter) : null;
+    }
+
+    public function getNextChapterId(ChapterId $chapterId): ?ChapterId
+    {
+        $currentChapter = $this->getChapterContext($chapterId);
+        $currentNumber = $currentChapter->getNumber();
+
+        $nextChapter = null;
+        $nextNumber = PHP_FLOAT_MAX;
+
+        foreach ($this->chapters as $id => $chapter) {
+            $number = $chapter['context']->getNumber();
+            if ($number > $currentNumber && $number < $nextNumber) {
+                $nextChapter = $id;
+                $nextNumber = $number;
+            }
+        }
+
+        return $nextChapter ? new ChapterId($nextChapter) : null;
+    }
+
+    public function getPageContent(ChapterId $chapterId, PageNumber $pageNumber): PageContent
+    {
+        if (!isset($this->chapters[$chapterId->getValue()])) {
+            throw ChapterNotFoundException::forChapter($chapterId);
+        }
+
+        $pages = $this->chapters[$chapterId->getValue()]['pages'];
+        $index = $pageNumber->getValue() - 1;
+
+        if (!isset($pages[$index])) {
+            throw PageNotFoundException::forPage($chapterId, $pageNumber);
+        }
+
+        $page = $pages[$index];
+
+        return new PageContent(
+            $page->getId(),
+            $page->getPageNumber(),
+            base64_encode('fake-image-content'),
+            'image/jpeg',
+            800,
+            600
+        );
+    }
+}