<?php

namespace App\Polls\Rules;

use Closure;
use Illuminate\Contracts\Validation\DataAwareRule;
use Illuminate\Contracts\Validation\ValidationRule;
use Illuminate\Support\Arr;

/**
 * The field is required when the array at $listAttribute contains $key,
 * e.g. the "Other" text when "Other" is one of the selected options.
 */
class RequiredWhenSelected implements ValidationRule, DataAwareRule
{
    /** Run even when the field is empty. */
    public bool $implicit = true;

    private array $data = [];

    public function __construct(private string $listAttribute, private string $key)
    {
    }

    public function setData(array $data): static
    {
        $this->data = $data;

        return $this;
    }

    public function validate(string $attribute, mixed $value, Closure $fail): void
    {
        $selected = (array) Arr::get($this->data, $this->listAttribute, []);

        if (in_array($this->key, $selected, true) && trim((string) $value) === '') {
            $fail(__('validation.required', ['attribute' => __('Other')]));
        }
    }
}