<?php

namespace Uploadcare;



class Api

{

  /**

   * Uploadcare public key

   *

   * @var string

   */

  private $public_key = null;



  /**

   * Uploadcare secret key

   *

   * @var string

   */

  private $secret_key = null;



  /**

   * API host for requests

   *

   * @var string

   */

  private $api_host = 'api.uploadcare.com';



  /**

   * Widget instance.

   *

   * @var Widget

   */

  public $widget = null;



  /**

   * Uploader instance

   *

   * @var Uploader

   */

  public $uploader = null;



  /**

   * Uploadcare library version

   *

   * @var string

   */

  public $version = '1.0.2/5.3';



  /**

   * Constructor

   *

   * @param string $public_key A public key given by Uploadcare.com

   * @param string $secret_key A private (secret) key given by Uploadcare.com

   * @return void

   */

  public function __construct($public_key, $secret_key)

  {

    $this->public_key = $public_key;

    $this->secret_key = $secret_key;

    $this->widget = new Widget($this);

    $this->uploader = new Uploader($this);

  }



  /**

   * Returns public key

   *

   * @return string

   */

  public function getPublicKey()

  {

    return $this->public_key;

  }



  /**

   * Return an array of File objects to work with.

   *

   * @param integer $page Page to be shown.

   * @return array

   */

  public function getFileList($page = 1)

  {

    $data = $this->__preparedRequest(API_TYPE_FILES, REQUEST_TYPE_GET, array('page' => $page));

    $files_raw = (array)$data->results;

    $result = array();

    foreach ($files_raw as $file_raw) {

      $result[] = new File($file_raw->file_id, $this);

    }

    return $result;

  }



  /**

   * Get info about pagination.

   *

   * @param integer $page

   * @return array

   */

  public function getFilePaginationInfo($page = 1)

  {

    $data = (array)$this->__preparedRequest(API_TYPE_FILES, REQUEST_TYPE_GET, array('page' => $page));

    unset($data['results']);

    return $data;

  }



  /**

   * Run raw request to REST.

   *

   * @param string $method Request method: GET, POST, HEAD, OPTIONS, PUT, etc

   * @param string $path Path to request

   * @param string $data Array of data to send.

   * @param string $headers Additonal headers.

   * @return array

   */

  public function request($method, $path, $data = array(), $headers = array())

  {

    $ch = curl_init(sprintf('https://%s%s', $this->api_host, $path));

    $this->__setRequestType($ch, $method);

    $this->__setHeaders($ch, $headers, $data);



    $data = curl_exec($ch);

    $ch_info = curl_getinfo($ch);

    if ($method == REQUEST_TYPE_DELETE) {

      if ($ch_info['http_code'] != 204) {

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

      }

    } else {

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

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

      }

    }

    curl_close($ch);

    if ($this->public_key == 'demopublickey' || $this->secret_key == 'demoprivatekey') {

      trigger_error('You are using the demo account. Please get an Uploadcare account at https://uploadcare.com/accounts/create/', E_USER_WARNING);

    }

    return json_decode($data);

  }



  /**

   * Make request to API.

   * Throws Exception if not http code 200 was returned.

   * If http code 200 it will parse returned data form request as JSON.

   *

   * @param string $type Construct type. Url will be generated using this params. Options: store

   * @param string $request_type Request type. Options: get, post, put, delete.

   * @param array $params Additional parameters for requests as array.

   * @throws Exception

   * @return array

   */

  public function __preparedRequest($type, $request_type = REQUEST_TYPE_GET, $params = array())

  {

    $url = $this->__getUrl($type, $params);



    $ch = $this->__initRequest($type, $params);

    $this->__setRequestType($ch, $request_type);

    $this->__setHeaders($ch);



    $data = curl_exec($ch);

    $ch_info = curl_getinfo($ch);

    if ($request_type == REQUEST_TYPE_DELETE) {

      if ($ch_info['http_code'] != 204) {

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

      }

    } else {

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

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

      }

    }

    curl_close($ch);

    if ($this->public_key == 'demopublickey' || $this->secret_key == 'demoprivatekey') {

      trigger_error('You are using the demo account. Please get an Uploadcare account at https://uploadcare.com/accounts/create/', E_USER_WARNING);

    }

    return json_decode($data);

  }



  /**

   * Inits curl request and rerturn handler

   *

   * @param string $type Construct type. Url will be generated using this params. Options: store

   * @param array $params Additional parameters for requests as array.

   * @return resource

   */

  private function __initRequest($type, $params = array())

  {

    $url = $this->__getUrl($type, $params);

    return $ch = curl_init($url);

  }



  /**

   * Return url to send request to.

   * Throws Exception if wrong type is provided or parameters missing.

   *

   * @param string $type Construct type.

   * @param array $params Additional parameters for requests as array.

   * @throws Exception

   * @return string

   */

  private function __getUrl($type, $params = array())

  {

    switch ($type) {

      case API_TYPE_RAW:

        return sprintf('https://%s/', $this->api_host);

      case API_TYPE_ACCOUNT:

        return sprintf('https://%s/account/', $this->api_host);

      case API_TYPE_FILES:

        return sprintf('https://%s/files/?page=%s', $this->api_host, $params['page']);

      case API_TYPE_STORE:

        if (array_key_exists(UC_PARAM_FILE_ID, $params) == false) {

          throw new \Exception('Please provide "store_id" param for request');

        }

        return sprintf('https://%s/files/%s/storage/', $this->api_host, $params['file_id']);

      case API_TYPE_FILE:

        if (array_key_exists(UC_PARAM_FILE_ID, $params) == false) {

          throw new \Exception('Please provide "store_id" param for request');

        }

        return sprintf('https://%s/files/%s/', $this->api_host, $params['file_id']);

      default:

        throw new \Exception('No api url type is provided for request. Use store, or appropriate constants.');

    }

  }



  /**

   * Set request type.

   * If request type is wrong an Exception will be thrown.

   *

   * @param resource $ch. Curl resource.

   * @param string $type Request type. Options: get, post, put, delete.

   * @throws Exception

   * @return void

   */

  private function __setRequestType($ch, $type = REQUEST_TYPE_GET)

  {

    switch ($type) {

      case REQUEST_TYPE_GET:

      case 'GET':

        break;

      case REQUEST_TYPE_POST:

      case 'POST':

        curl_setopt($ch, CURLOPT_POST, true);

        break;

      case REQUEST_TYPE_PUT:

      case 'PUT':

        curl_setopt($ch, CURLOPT_PUT, true);

        break;

      case REQUEST_TYPE_DELETE:

      case 'DELETE':

        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');

        break;

      case REQUEST_TYPE_HEAD:

      case 'HEAD':

        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'HEAD');

        break;

      case REQUEST_TYPE_OPTIONS:

      case 'OPTIONS':

        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'OPTIONS');

        break;

      default:

        throw new \Exception('No request type is provided for request. Use post, put, delete, get or appropriate constants.');

    }

  }



  /**

   * Set all the headers for request and set returntrasfer.

   *

   * @param resource $ch. Curl resource.

   * @param array $headers additional headers.

   * @param array $data Data array.

   * @return void

   */

  private function __setHeaders($ch, $add_headers = array(), $data = array())

  {

    $content_length = 0;

    if (count($data)) {

      $content_length = strlen(http_build_query($data));

    }

    $headers = array(

        sprintf('Host: %s', $this->api_host),

        sprintf('Authorization: Uploadcare.Simple %s:%s', $this->public_key, $this->secret_key),

        'Content-Type: application/json',

        'Content-Length: '.$content_length,

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

        sprintf('Date: %s', date('Y-m-d H:i:s')),

    ) + $add_headers;

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

  }



  /**

   * Get object of File class by file_id

   *

   * @param string $file_id Uploadcare file_id

   * @return File

   */

  public function getFile($file_id)

  {

    return new File($file_id, $this);

  }

}