<?php

namespace App\Http\Controllers\Miniapp;

use App\Http\Controllers\Controller;
use App\Models\MiniappUser;
use App\Models\Paper;
use App\Support\ApiResponse;
use App\Support\Miniapp\MiniappPresenter;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class PaperController extends Controller
{
    use ApiResponse;

    public function index(Request $request): JsonResponse
    {
        /** @var MiniappUser $user */
        $user = $request->user();
        $payload = MiniappPresenter::userPayload($user);

        if (! ($payload['can_see_papers'] ?? false)) {
            return $this->fail('无权访问论文库', 403);
        }

        $query = Paper::query()->withCount('teachers');

        if ($kw = $request->query('keyword')) {
            $query->where(function ($q) use ($kw) {
                $q->where('title', 'like', "%{$kw}%")
                    ->orWhere('authors', 'like', "%{$kw}%")
                    ->orWhere('school_name', 'like', "%{$kw}%")
                    ->orWhere('summary', 'like', "%{$kw}%");
            });
        }

        $paginator = $query
            ->orderByDesc('published_at')
            ->orderByDesc('id')
            ->paginate((int) $request->query('page_size', 20))
            ->withQueryString();

        $paginator->getCollection()->transform(fn (Paper $p) => $this->serializePaper($p));

        return $this->paginated($paginator);
    }

    public function show(Request $request, int $paper): JsonResponse
    {
        /** @var MiniappUser $user */
        $user = $request->user();
        $payload = MiniappPresenter::userPayload($user);

        if (! ($payload['can_see_papers'] ?? false)) {
            return $this->fail('无权访问论文库', 403);
        }

        $model = Paper::query()->withCount('teachers')->findOrFail($paper);

        return $this->ok($this->serializePaper($model));
    }

    /**
     * @return array<string, mixed>
     */
    protected function serializePaper(Paper $paper): array
    {
        return [
            'id' => $paper->id,
            'title' => $paper->title,
            'authors' => $paper->authors,
            'school_name' => $paper->school_name,
            'published_at' => $paper->published_at?->toDateString(),
            'url' => $paper->url,
            'summary' => $paper->summary,
            'source_site' => $paper->source_site,
            'teachers_count' => (int) ($paper->teachers_count ?? 0),
        ];
    }
}