scrum-poker-internal/app/Http/Requests/JoinRoomRequest.php

<?php

namespace App\Http\Requests;

use App\Models\Player;
use App\Models\Room;
use Illuminate\Contracts\Validation\ValidationRule;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;
use Illuminate\Validation\Validator;

class JoinRoomRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     */
    public function authorize(): bool
    {
        return true;
    }

    protected function prepareForValidation(): void
    {
        $this->merge([
            'join_code' => strtoupper(trim((string) $this->input('join_code'))),
            'player_name' => trim((string) $this->input('player_name')),
        ]);
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array<string, ValidationRule|array<mixed>|string>
     */
    public function rules(): array
    {
        $roomId = Room::query()
            ->where('join_code', $this->input('join_code'))
            ->value('id');

        $existingPlayerId = null;

        if ($roomId !== null && $this->user() !== null) {
            $existingPlayerId = Player::query()
                ->where('room_id', $roomId)
                ->where('user_id', $this->user()->id)
                ->value('id');
        } elseif ($roomId !== null) {
            $sessionPlayerId = $this->session()->get("room_players.{$roomId}");
            $existingPlayerId = is_numeric($sessionPlayerId)
                ? Player::query()
                    ->where('room_id', $roomId)
                    ->whereKey((int) $sessionPlayerId)
                    ->value('id')
                : null;
        }

        $playerNameRules = ['required', 'string', 'max:50'];

        if ($existingPlayerId === null) {
            $playerNameRules[] = Rule::unique(Player::class, 'name')->where('room_id', $roomId);
        }

        return [
            'join_code' => [
                'bail',
                'string',
                'required',
                'size:6',
                Rule::exists(Room::class, 'join_code')->whereNull('deleted_at'),
            ],
            'player_name' => $playerNameRules,
        ];
    }

    /** @return array<callable(Validator): void> */
    public function after(): array
    {
        return [
            function (Validator $validator): void {
                $room = Room::query()
                    ->where('join_code', $this->input('join_code'))
                    ->first();

                if ($room?->isClosed()) {
                    $validator->errors()->add('join_code', 'Dieser Raum ist geschlossen.');
                }
            },
        ];
    }

    public function messages(): array
    {
        return [
            'join_code.exists' => 'Dieser Raumcode existiert nicht.',
            'join_code.size' => 'Der Raumcode muss aus sechs Zeichen bestehen.',
            'player_name.unique' => 'Dieser Name wird in dem Raum bereits verwendet.',
        ];
    }
}