<?php

class OAuthClient {
  /** @var OAuth */
  public $oauth;

  /** @var cURL */
  public $curl;

  function __construct(array $config) {
    // sudo pecl install oauth
    $this->oauth = new OAuth($config['api_key'], $config['api_secret']);
    $this->oauth->setToken($config['access_token'], $config['access_token_secret']);

    $this->curl = curl_init();

    curl_setopt_array($this->curl, array(
      CURLOPT_CONNECTTIMEOUT => 10,
      CURLOPT_TIMEOUT => 0,
      CURLOPT_VERBOSE => true,
    ));
  }

  function exec($url, $data = array(), $method = 'GET') {
    curl_setopt($this->curl, CURLOPT_URL, $url);

    switch ($method) {
      case 'GET':
        curl_setopt($this->curl, CURLOPT_HTTPGET, true);
        break;

      case 'POST':
        curl_setopt($this->curl, CURLOPT_POSTFIELDS, http_build_query($data));
        break;
    }

    curl_setopt($this->curl, CURLOPT_HTTPHEADER, array(
      'Authorization: ' . $this->oauth->getRequestHeader($method, $url, $data)
    ));

    curl_exec($this->curl);

    // TODO: retry connection if failed, with backoff
    // TODO: retry on idle connection
  }
}