<?php
namespace common\services;

use common\helpers\FuncHelper;
use GuzzleHttp\Client;
use OSS\Core\OssException;
use OSS\OssClient;
use yii\base\Exception;
use yii\web\UploadedFile;

class UploadService{

    protected $docExt = ['txt', 'doc', 'docx', 'ppt', 'pptx', 'xls', 'xlsx', 'csv', 'pdf', 'md'];
    protected $imageExt = ['jpg', 'jpeg', 'png', 'gif', 'bmp', 'webp',];
    protected $videoExt = ['mp4', 'ogg', 'm4a',];
    protected static $guzzleOptions = ['http_errors' => false];

    public function __construct()
    {
        $this->storage = \Yii::$app->params['upload'];
    }

    /**
     * Get a fresh instance of the Guzzle HTTP client.
     *
     * @return \GuzzleHttp\Client
     */
    protected function getHttpClient()
    {
        return new Client(self::$guzzleOptions);
    }

    public function index($name)
    {
        $file = UploadedFile::getInstanceByName($name);


        $this->file = $file;

        $this->validateSize();

        $this->saveFileFolder = '/uploads/' . date('Ymd');
        $this->saveFileName = md5_file($this->file->tempName) . '.' . $this->file->getExtension();

        switch($this->storage['type']){
            case 'alioss':
                $this->saveToAliOss();
                break;
            default:
                $this->saveToLocal();
                break;
        }
        return $this->url;
    }

    public function validateSize()
    {
        $supportExt = array_merge($this->docExt, $this->imageExt, $this->videoExt);
        if (!in_array($this->file->extension, $supportExt)) {
            throw new Exception('不支持的文件类型: ' . $this->file->extension);
        }

        if (in_array($this->file->extension, $this->imageExt)) {
            if ($this->storage['image_limit'] && $this->file->size > $this->storage['image_limit'] * 1024 * 1024) {
                throw new Exception('图片大小超出限制,当前大小为: '
                    . (round($this->file->size / 1024 / 1024, 4)) . 'MB,最大限制为:'
                    . $this->storage['image_limit'] . 'MB');
            }
        }

        if (in_array($this->file->extension, $this->videoExt)) {
            if ($this->storage['video_limit'] && $this->file->size > $this->storage['video_limit'] * 1024 * 1024) {
                throw new Exception('视频大小超出限制,当前大小为: '
                    . (round($this->file->size / 1024 / 1024, 4)) . 'MB,最大限制为:'
                    . $this->storage['video_limit'] . 'MB');
            }
        }
    }

    private function saveToLocal()
    {
        $saveFile = $this->storage['path'] . $this->saveFileFolder . '/' . $this->saveFileName;
        $dir = dirname($saveFile);
        FuncHelper::make_dir($dir);

        if(move_uploaded_file($this->file->tempName,$saveFile)){
            $this->url = $this->storage['url'] . $this->saveFileFolder . '/' . $this->saveFileName;
        }else{
            throw new Exception('上传图片失败');
        }
    }

    public function saveToAliOss()
    {
        try {
            $config = $this->storage['alioss'];

            $isCName = (!empty($config['is_cname']) && $config['is_cname'] == 1) ? true : false;
            $client = new OssClient($config['access_key'], $config['secret_key'], $config['domain'], $isCName);

            $object = trim($this->saveFileFolder . '/' . $this->saveFileName, '/');
            $client->uploadFile($config['bucket'], $object, $this->file->tempName);
            if (!$isCName) {
                $endpointNameStart = mb_stripos($config['domain'], '://') + 3;
                $urlPrefix = mb_substr($config['domain'], 0, $endpointNameStart)
                    . $config['bucket']
                    . '.'
                    . mb_substr($config['domain'], $endpointNameStart);
            } else {
                $urlPrefix = $config['domain'];
            }
            $this->url = $urlPrefix . $this->saveFileFolder . '/' . $this->saveFileName;

        } catch (OssException $e) {
            throw new Exception($e->getMessage());
        }
    }

    public function saveFile($file_path)
    {
        $this->saveFileFolder = '/uploads/' . date('Ymd');
        $this->saveFileName = md5_file($file_path) . '.' . strtolower(pathinfo($file_path, PATHINFO_EXTENSION));
        try {
            $config = $this->storage['alioss'];

            $isCName = (!empty($config['is_cname']) && $config['is_cname'] == 1) ? true : false;
            $client = new OssClient($config['access_key'], $config['secret_key'], $config['domain'], $isCName);

            $object = trim($this->saveFileFolder . '/' . $this->saveFileName, '/');
            $client->uploadFile($config['bucket'], $object,$file_path);
            if (!$isCName) {
                $endpointNameStart = mb_stripos($config['domain'], '://') + 3;
                $urlPrefix = mb_substr($config['domain'], 0, $endpointNameStart)
                    . $config['bucket']
                    . '.'
                    . mb_substr($config['domain'], $endpointNameStart);
            } else {
                $urlPrefix = $config['domain'];
            }
            $this->url = $urlPrefix . $this->saveFileFolder . '/' . $this->saveFileName;

            unlink($file_path);
            return $this->url;
        } catch (OssException $e) {
            unlink($file_path);
            throw new Exception($e->getMessage());
        }
    }

    /**
     * 阿里云直传
     */
    public function redirectFile($data)
    {
        $config = $this->storage['alioss'];
        $callbackUrl = $data['callbackUrl'];

        $dir = $data['dir'];
        $key = $config['secret_key'];
        $id  = $config['access_key'];
        $host  = $config['domain'];

        $callback_param = array(
            'callbackUrl' => $callbackUrl,
            'callbackBody' => 'filename=${object}&size=${size}&mimeType=${mimeType}&height=${imageInfo.height}&width=${imageInfo.width}',
            'callbackBodyType' => "application/x-www-form-urlencoded"
        );
        $callback_string = json_encode($callback_param);
        $base64_callback_body = base64_encode($callback_string);

        $now = time();
        $expire = 30;  //设置该policy超时时间是10s. 即这个policy过了这个有效时间，将不能访问。
        $end = $now + $expire;

        $expiration = $this->gmt_iso8601($end);

        //最大文件大小.用户可以自己设置
//        $condition = array(0 => 'content-length-range', 1 => 0, 2 => 1048576000);
//        $conditions[] = $condition;

        // 表示用户上传的数据，必须是以$dir开始，不然上传会失败，这一步不是必须项，只是为了安全起见，防止用户通过policy上传到别人的目录。
        $start = array(0 => 'starts-with', 1 => '$key', 2 => $dir);
        $conditions[] = $start;

        $arr = array('expiration' => $expiration, 'conditions' => $conditions);
        $policy = json_encode($arr);
        $base64_policy = base64_encode($policy);

        $string_to_sign = $base64_policy;
        $signature = base64_encode(hash_hmac('sha1', $string_to_sign, $key, true));

        $response = array();
        $response['accessid'] = $id;
        $response['host'] = $host;
        $response['policy'] = $base64_policy;
        $response['signature'] = $signature;
        $response['expire'] = $end;
        $response['callback'] = $base64_callback_body;
        $response['dir'] = $dir;  // 这个参数是设置用户上传文件时指定的前缀。
        $response['savename'] = md5(time().mt_rand(100,999));

        return $response;
    }

    public function gmt_iso8601($time)
    {
        return str_replace('+00:00', '.000Z', gmdate('c', $time));
    }

    /**
     * 获取直传回调公钥
     */
    public function getPublicKey($pubKeyUrlBase64)
    {
        try {
            $pubKeyUrl = base64_decode($pubKeyUrlBase64);
            $response = $this->getHttpClient()->get($pubKeyUrl);
            $body = $response->getBody();
            $buffer = $body->getContents();
            return $buffer;
        }catch (\Exception $exception){
            return "";
        }
    }

    /**
     * 处理下返回,域名前缀
     */
    public function getBody($body)
    {
        $config = $this->storage['alioss'];

        parse_str($body,$body_arr);
        $isCName = (!empty($config['is_cname']) && $config['is_cname'] == 1) ? true : false;

        if (!$isCName) {
            $endpointNameStart = mb_stripos($config['domain'], '://') + 3;
            $urlPrefix = mb_substr($config['domain'], 0, $endpointNameStart)
                . $config['bucket']
                . '.'
                . mb_substr($config['domain'], $endpointNameStart);
        } else {
            $urlPrefix = $config['domain'];
        }
        $body_arr['filename'] = $urlPrefix . '/' . $body_arr['filename'];
        return $body_arr;
    }

}