<?php

namespace App\Http\Controllers\Concerns;

use Illuminate\Http\Request;

trait ManagesCaptcha
{
    protected function buildCaptchaQuestion(Request $request, string $context): string
    {
        $first = random_int(2, 9);
        $second = random_int(1, 9);
        $isSubtraction = random_int(0, 1) === 1;

        if ($isSubtraction && $second > $first) {
            [$first, $second] = [$second, $first];
        }

        $question = $isSubtraction ? "{$first} - {$second}" : "{$first} + {$second}";
        $answer = (string) ($isSubtraction ? $first - $second : $first + $second);

        $request->session()->put("captcha.{$context}.answer", $answer);

        return $question;
    }

    protected function captchaIsValid(Request $request, string $context, string $field = 'captcha'): bool
    {
        $expected = (string) $request->session()->get("captcha.{$context}.answer", '');
        $provided = trim((string) $request->input($field, ''));

        return $expected !== '' && hash_equals($expected, $provided);
    }

    protected function clearCaptcha(Request $request, string $context): void
    {
        $request->session()->forget("captcha.{$context}.answer");
    }
}