<?php

namespace Tests\Unit\Post\UseCases;

use App\Exceptions\BadRequestException;
use App\Exceptions\ForbiddenException;
use App\Post\CreatePostDto;
use App\Post\Post;
use App\Post\UseCases\ClearFeaturedPost\ClearFeaturedPost;
use App\Post\UseCases\ClearFeaturedPost\ClearFeaturedPostRequest;
use DateTimeImmutable;
use DateTimeZone;
use Tests\Fakes\FakePostRepository;
use Tests\TestCase;

class ClearFeaturedPostTest extends TestCase
{
    private FakePostRepository $postRepo;

    private ClearFeaturedPost $useCase;

    private DateTimeImmutable $now;

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

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

        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_non_admin_throws_forbidden(): void
    {
        $post = $this->seedFeaturedPost(1);
        $this->expectException(ForbiddenException::class);
        $this->useCase->execute(new ClearFeaturedPostRequest(
            postId: $post->getId(),
            requesterIsAdmin: false,
        ));
    }

    public function test_zero_post_id_throws_bad_request(): void
    {
        $this->expectException(BadRequestException::class);
        $this->useCase->execute(new ClearFeaturedPostRequest(
            postId: 0,
            requesterIsAdmin: true,
        ));
    }

    public function test_unknown_post_is_no_op(): void
    {
        $this->useCase->execute(new ClearFeaturedPostRequest(
            postId: 999,
            requesterIsAdmin: true,
        ));

        $this->assertNull($this->postRepo->find(999));
    }

    public function test_admin_clears_feature_slot(): void
    {
        $post = $this->seedFeaturedPost(2);

        $this->useCase->execute(new ClearFeaturedPostRequest(
            postId: $post->getId(),
            requesterIsAdmin: true,
        ));

        $this->assertNull(
            $this->postRepo->find($post->getId())->getFeatureSlot(),
        );
    }
}