<?php

namespace Uploadcare;



class Uploader

{

  /**

   * Base upload host

   *

   * @var string

   */

  private $host = 'upload.uploadcare.com';



  /**

   * Api instance

   *

   * @var Api

   */

  private $api = null;



  /**

   * Constructor

   */

  public function __construct(Api $api)

  {

    $this->api = $api;

  }



  /**

   * Check file status.

   * Return array of json data

   *

   * @param string $file_id

   * @return array

   */

  public function status($token)

  {

    $data = array(

        'token' => $token,

    );

    $ch = $this->__initRequest('status', $data);

    $this->__setHeaders($ch);

    $data = $this->__runRequest($ch);

    return $data;

  }



  /**

   * Upload file from url and get File instance

   *

   * @param string $url An url of file to be uploaded.

   * @return File

   */

  public function fromUrl($url, $check_status = true, $timeout = 1, $max_attempts = 5)

  {

    $data = array(

        '_' => time(),

        'source_url' => $url,

        'pub_key' => $this->api->getPublicKey(),

    );

    $ch = $this->__initRequest('from_url', $data);

    $this->__setHeaders($ch);



    $data = $this->__runRequest($ch);

    $token = $data->token;



    if ($check_status) {

      $success = false;

      $attempts = 0;

      while (!$success) {

        $data = $this->status($token);

        if ($data->status == 'success') {

          $success = true;

        }

        if ($attempts == $max_attempts) {

          throw new \Exception('Cannot store file, max attempts reached, upload is not successful');

        }

        sleep($timeout);

        $attempts++;

      }

    } else {

      return $token;

    }

    $file_id = $data->file_id;



    return new File($file_id, $this->api);

  }



  /**

   * Upload file from local path.

   *

   * @param string $path

   * @return File

   */

  public function fromPath($path)

  {

    $data = array(

        'UPLOADCARE_PUB_KEY' => $this->api->getPublicKey(),

        'file' => '@'.$path,

    );

    $ch = $this->__initRequest('base');

    $this->__setRequestType($ch);

    $this->__setData($ch, $data);

    $this->__setHeaders($ch);



    $data = $this->__runRequest($ch);

    $file_id = $data->file;

    return new File($file_id, $this->api);

  }



  /**

   * Upload file from file pointer

   *

   * @param resourse $fp

   * @return File

   */

  public function fromResource($fp)

  {

    $tmpfile = tempnam(sys_get_temp_dir(), 'ucr');

    $temp = fopen($tmpfile, 'w');

    while (!feof($fp)) {

      fwrite($temp, fread($fp, 8192));

    }

    fclose($temp);

    fclose($fp);



    $data = array(

        'UPLOADCARE_PUB_KEY' => $this->api->getPublicKey(),

        'file' => '@'.$tmpfile,

    );

    $ch = $this->__initRequest('base');

    $this->__setRequestType($ch);

    $this->__setData($ch, $data);

    $this->__setHeaders($ch);



    $data = $this->__runRequest($ch);

    $file_id = $data->file;

    return new File($file_id, $this->api);

  }



  /**

   * Upload file from string using mime-type.

   *

   * @param string $content

   * @param string $mime_type

   * @return File

   */

  public function fromContent($content, $mime_type)

  {

    $tmpfile = tempnam(sys_get_temp_dir(), 'ucr');

    $temp = fopen($tmpfile, 'w');

    fwrite($temp, $content);

    fclose($temp);



    $data = array(

        'UPLOADCARE_PUB_KEY' => $this->api->getPublicKey(),

        'file' => sprintf('@%s;type=%s', $tmpfile, $mime_type),

    );

    $ch = $this->__initRequest('base');

    $this->__setRequestType($ch);

    $this->__setData($ch, $data);

    $this->__setHeaders($ch);



    $data = $this->__runRequest($ch);

    $file_id = $data->file;

    return new File($file_id, $this->api);

  }



  /**

   * Init upload request and return curl resource

   *

   * @param array $data

   * @return resource

   */

  private function __initRequest($type, $data = null)

  {

    $url = sprintf('https://%s/%s/', $this->host, $type);

    if (is_array($data)) {

      $url = sprintf('%s?%s', $url, http_build_query($data));

    }

    $ch = curl_init($url);

    return $ch;

  }



  /**

   * Set request type for curl resrouce

   *

   * @param resource $ch

   * @return void

   */

  private function __setRequestType($ch)

  {

    curl_setopt($ch, CURLOPT_POST, true);

  }



  /**

   * Set all the headers for request and set returntrasfer.

   *

   * @param resource $ch. Curl resource.

   * @return void

   */

  private function __setHeaders($ch)

  {

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    curl_setopt($ch, CURLOPT_HTTPHEADER, array(

    'User-Agent: PHP Uploadcare Module '.$this->api->version,

    ));

  }



  /**

   * Set data to be posted on request

   *

   * @param resource $ch. Curl resource

   * @param array $data

   * @return void

   */

  private function __setData($ch, $data = array())

  {

    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

  }



  /**

   * Run prepared curl request.

   * Throws Exception of not 200 http code

   *

   * @param resource $ch. Curl resource

   * @throws Exception

   * @return array

   */

  private function __runRequest($ch)

  {

    $data = curl_exec($ch);

    $ch_info = curl_getinfo($ch);

    if ($ch_info['http_code'] != 200) {

      throw new \Exception('Request returned unexpected http code '.$ch_info['http_code'].'. '.$data);

    }

    curl_close($ch);

    return json_decode($data);

  }

}