<?php

namespace Tests\Fakes;

use App\Post\CreatePostDto;
use App\Post\Post;
use App\Post\PostRepository;
use RuntimeException;

class FakePostRepository implements PostRepository
{
    /**
     * @var Post[]
     */
    private array $existingPosts = [];

    public function create(CreatePostDto $dto): Post
    {
        $id = $this->getNextId();
        $post = new Post(
            id: $id,
            userId: $dto->userId,
            title: $dto->title,
            body: $dto->body,
            createdAt: $dto->createdAt,
            featureSlot: null,
        );
        $this->existingPosts[$id] = $post;

        return $this->copy($post);
    }

    public function find(int $id): ?Post
    {
        $post = $this->existingPosts[$id] ?? null;
        if ($post === null) {
            return null;
        }

        return $this->copy($post);
    }

    /**
     * @return Post[]
     */
    public function findByUserId(int $userId): array
    {
        $matching = [];
        foreach ($this->existingPosts as $post) {
            if ($post->getUserId() === $userId) {
                $matching[] = $this->copy($post);
            }
        }
        usort(
            $matching,
            function (Post $left, Post $right) {
                return $right->getCreatedAt() <=> $left->getCreatedAt();
            },
        );

        return $matching;
    }

    /**
     * @return Post[]
     */
    public function findRecent(int $limit): array
    {
        $all = array_map(
            function (Post $post) {
                return $this->copy($post);
            },
            array_values($this->existingPosts),
        );
        usort(
            $all,
            function (Post $left, Post $right) {
                return $right->getCreatedAt() <=> $left->getCreatedAt();
            },
        );

        return array_slice($all, 0, $limit);
    }

    public function delete(int $id): void
    {
        unset($this->existingPosts[$id]);
    }

    /**
     * @throws RuntimeException
     */
    public function update(Post $post): Post
    {
        $id = $post->getId();
        if (! isset($this->existingPosts[$id])) {
            throw new RuntimeException(
                "Post with id: $id does not exist"
            );
        }
        $this->existingPosts[$id] = $post;

        return $this->copy($post);
    }

    public function findByFeatureSlot(int $slot): ?Post
    {
        foreach ($this->existingPosts as $post) {
            if ($post->getFeatureSlot() === $slot) {
                return $this->copy($post);
            }
        }

        return null;
    }

    /**
     * @return Post[]
     */
    public function findFeatured(): array
    {
        $featured = [];
        foreach ($this->existingPosts as $post) {
            if ($post->isFeatured()) {
                $featured[] = $this->copy($post);
            }
        }
        usort(
            $featured,
            function (Post $left, Post $right) {
                return $left->getFeatureSlot() <=> $right->getFeatureSlot();
            },
        );

        return $featured;
    }

    private function copy(Post $post): Post
    {
        return new Post(
            id: $post->getId(),
            userId: $post->getUserId(),
            title: $post->getTitle(),
            body: $post->getBody(),
            createdAt: $post->getCreatedAt(),
            featureSlot: $post->getFeatureSlot(),
        );
    }

    private function getNextId(): int
    {
        return count($this->existingPosts) + 1;
    }
}