<?php

declare(strict_types=1);

namespace App\Support\Health\Checks;

use App\Models\Call;
use App\Models\Page;
use App\Models\Project;
use App\Support\Health\Check;
use App\Support\Health\Finding;
use App\Support\Health\Severity;
use Illuminate\Database\Eloquent\Model;

/**
 * Two records answering at the same URL in the same language.
 *
 * `UniqueTranslatedSlug` prevents this on write, but a slug lives inside a
 * JSON column, so it can never be a database constraint — which means data
 * that arrived any other way (a seeder, an import, a manual fix) can still
 * collide. When it does, the public API resolves the URL to whichever row it
 * happens to reach first.
 *
 * Detected in PHP rather than with a GROUP BY on a JSON path, because that
 * expression is written differently in every database and these tables hold
 * hundreds of rows, not millions.
 */
class DuplicateSlugs implements Check
{
    public function key(): string
    {
        return 'duplicate-slugs';
    }

    public function permission(): ?string
    {
        return null;
    }

    public function run(): Finding
    {
        $locales = array_keys((array) config('locales.supported'));
        $samples = [];
        $count = 0;

        foreach ([Page::class, Project::class, Call::class] as $model) {
            /** @var array<int, Model> $records */
            $records = $model::query()->get(['id', 'slug'])->all();

            foreach ($locales as $locale) {
                $seen = [];

                foreach ($records as $record) {
                    $slug = $record->getTranslation('slug', $locale, false);

                    if (blank($slug)) {
                        continue;
                    }

                    if (isset($seen[$slug])) {
                        $count++;
                        $samples[] = "{$slug} ({$locale})";

                        continue;
                    }

                    $seen[$slug] = true;
                }
            }
        }

        return Finding::problem($this->key(), $count, Severity::Error, samples: $samples);
    }
}