<?php

namespace Tests\Unit\Post\UseCases;

use App\Post\CreatePostDto;
use App\Post\Post;
use App\Post\UseCases\ListFeaturedPosts\ListFeaturedPosts;
use DateTimeImmutable;
use DateTimeZone;
use Tests\Fakes\FakePostRepository;
use Tests\TestCase;

class ListFeaturedPostsTest extends TestCase
{
    private FakePostRepository $postRepo;

    private ListFeaturedPosts $useCase;

    private DateTimeImmutable $now;

    protected function setUp(): void
    {
        $this->now = new DateTimeImmutable(
            '2026-05-06T12:00:00',
            new DateTimeZone('UTC'),
        );
        $this->postRepo = new FakePostRepository;
        $this->useCase = new ListFeaturedPosts($this->postRepo);
    }

    private function seedFeaturedPost(string $title, ?int $slot): Post
    {
        $post = $this->postRepo->create(new CreatePostDto(
            userId: 1,
            title: $title,
            body: 'B',
            createdAt: $this->now,
        ));
        if ($slot === null) {
            return $post;
        }

        return $this->postRepo->update(new Post(
            id: $post->getId(),
            userId: $post->getUserId(),
            title: $post->getTitle(),
            body: $post->getBody(),
            createdAt: $post->getCreatedAt(),
            featureSlot: $slot,
        ));
    }

    public function test_returns_empty_when_none_featured(): void
    {
        $this->seedFeaturedPost('not featured', null);
        $this->assertSame([], $this->useCase->execute());
    }

    public function test_returns_featured_posts_in_slot_order(): void
    {
        $this->seedFeaturedPost('slot-2', 2);
        $this->seedFeaturedPost('slot-1', 1);
        $this->seedFeaturedPost('not-featured', null);

        $featured = $this->useCase->execute();

        $this->assertCount(2, $featured);
        $this->assertSame('slot-1', $featured[0]->getTitle());
        $this->assertSame('slot-2', $featured[1]->getTitle());
    }
}