<?php

declare(strict_types=1);
//TODO: 打个标记 下次一定改静态类（
namespace Sakura\API;

class Captcha
{
    private $captchCode;

    /**
     * CAPTCHA constructor.
     */
    public function __construct()
    {
        $this->captchCode = '';
    }

    /**
     * create_captcha
     *
     * @return void
     */
    private function create_captcha(): void
    {
        $dict = str_split('abcdefhjkmnpqrstuvwxy12345678');
        $randKeys = array_rand($dict, 5);
        $this->captchCode = implode('', array_map(function ($value) use ($dict) {
            return $dict[$value];
        }, $randKeys));
    }

    /**
     * crypt_captcha
     *
     * @return string
     */
    private function crypt_captcha(): string
    {
        //return md5($this->captchCode);
        return password_hash($this->captchCode, PASSWORD_DEFAULT);
        // return wp_hash_password($this->captchCode);
    }

    /**
     * verify_captcha
     *
     * @param  string $captcha
     * @param  string $hash
     * @return bool
     */
    public function verify_captcha(string $captcha, string $hash): bool
    {
        //return md5($captcha) == $hash ? true : false;
        return password_verify($captcha, $hash);
        // return wp_check_password($captcha, $hash);
    }

    /**
     * create_captcha_img
     *
     * @return array
     */
    public function create_captcha_img(): array
    {
        //创建画布
        $img = imagecreatetruecolor(120, 40);
        $file = STYLESHEETPATH . '/inc/KumoFont.ttf';
        //填充背景色
        $backcolor = imagecolorallocate($img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(0, 255));
        imagefill($img, 0, 0, $backcolor);

        //创建验证码
        $this->create_captcha();
        //绘制文字
        for ($i = 0; $i < 5; $i++) {
            // $span = 20;
            $stringcolor = imagecolorallocate($img, mt_rand(0, 255), mt_rand(0, 100), mt_rand(0, 80));
            imagefttext($img, 25, 2, $i * 20, 30, $stringcolor, $file, $this->captchCode[$i]);
        }

        //添加干扰线
        for ($i = 0; $i < 8; $i++) {
            $linecolor = imagecolorallocate($img, mt_rand(0, 150), mt_rand(0, 250), mt_rand(0, 255));
            imageline($img, mt_rand(0, 179), mt_rand(0, 39), mt_rand(0, 179), mt_rand(0, 39), $linecolor);
        }

        //添加干扰点
        for ($i = 0; $i < 144; $i++) {
            $pixelcolor = imagecolorallocate($img, mt_rand(100, 150), mt_rand(0, 120), mt_rand(0, 255));
            imagesetpixel($img, mt_rand(0, 179), mt_rand(0, 39), $pixelcolor);
        }
        $timestamp = time();
        $this->captchCode .= $timestamp;
        //打开缓存区
        ob_start();
        imagepng($img);
        //输出图片
        $captchaimg =  ob_get_contents();
        //销毁缓存区
        ob_end_clean();
        //销毁图片(释放资源)
        imagedestroy($img);
        // 以json格式输出
        $captchaimg = 'data:image/png;base64,' . base64_encode($captchaimg);
        return [
            'code' => 0,
            'data' => $captchaimg,
            'msg' => '',
            'id' => $this->crypt_captcha(),
            'time' => $timestamp,
        ];
    }


    /**
     * check_captcha
     *
     * @param  string $captcha
     * @return array
     */
    public function check_captcha(string $captcha, int $timestamp, string $id): array
    {
        $currentTime = time();
        $timeThreshold = $currentTime - 60;
        if (!isset($timestamp) || !isset($id) || !preg_match('/^[\w$.\/]+$/', $id) || !ctype_digit((string)$timestamp)) {
            $code = 3;
            $msg = __('Bad Request.',"sakurairo");//非法请求
        } elseif (empty($captcha) || strlen($captcha) !== 5) {
            $code = 3;
            $msg = __("Look like you forgot to enter the captcha.","sakurairo");//请输入正确的验证码!
        } elseif ($timestamp < $timeThreshold) {
            $code = 2;
            $msg =  __("Captcha timeout.","sakurairo");//超时!
        } elseif ($timestamp >= $timeThreshold && $timestamp <= $currentTime) {
            if ($this->verify_captcha($captcha . $timestamp, $id)) {
                $code = 5;
                $msg = __("Captcha check passed.","sakurairo");//'验证码正确!'
            } else {
                $code = 1;
                $msg = __("Captcha incorrect.","sakurairo");//'验证码错误!'
            }
        } else {
            $code = 1;
            $msg = __("An error has occurred.","sakurairo");//'错误!'
        }
        return [
            'code' => $code,
            'data' => '',
            'msg' => $msg
        ];
    }
}