<?php

namespace App\Services;

use App\Exceptions\BizException;
use Illuminate\Contracts\Cache\Repository as Cache;

class CaptchaService
{
    /**
     * @var string
     */
    protected $cachePrefix = 'captchas_';

    /**
     * @param \Illuminate\Contracts\Cache\Repository $cache
     */
    public function __construct(
        protected Cache $cache,
    ) {
    }

    /**
     * 将验证码存入缓存中
     *
     * @param string $key
     * @param string $phrase
     * @param integer $ttl
     * @return void
     */
    public function put(string $key, string $phrase, int $ttl = 300): void
    {
        $this->cache->put($this->cacheKey($key), $phrase, $ttl);
    }

    /**
     * 校验验证码是否正确
     *
     * @param string $key
     * @param string $phrase
     * @return bool
     */
    public function testPhrase(string $key, string $phrase): bool
    {
        if ($phrase === '') {
            return false;
        }

        $value = (string) $this->cache->pull(
            $this->cacheKey($key)
        );

        return strtolower($value) === strtolower($phrase);
    }

    /**
     * 校验验证码是否正确
     *
     * @param string $key
     * @param string $phrase
     * @return void
     *
     * @throws \App\Exceptions\BizException
     */
    public function validatePhrase(string $key, string $phrase): void
    {
        if (! $this->testPhrase($key, $phrase)) {
            throw new BizException(__('Invalid captcha'));
        }
    }

    /**
     * 生成验证码缓存的 key
     *
     * @param string $key
     * @return string
     */
    protected function cacheKey(string $key): string
    {
        return $this->cachePrefix.$key;
    }
}