<?php

/**
 * Super-simple, minimum abstraction MailChimp API v2 wrapper
 *
 * Requires curl (I know, right?)
 * This probably has more comments than code.
 *
 * @author Drew McLellan <drew.mclellan@gmail.com>
 * @version 1.0
 */
class mailChimpClientPps
{
  private $api_key;
  private $api_endpoint = 'https://<dc>.api.mailchimp.com/2.0/';

  /**
   * Create a new instance
   * @param string $api_key Your MailChimp API key
   */
  public function __construct($api_key)
  {
    $this->api_key = $api_key;
    $datacentre = '';
    if (strpos($this->api_key, '-') !== false) {
      [, $datacentre] = explode('-', $this->api_key);
    }
    $this->api_endpoint = str_replace('<dc>', $datacentre, $this->api_endpoint);
  }

  /**
   * Call an API method. Every request needs the API key, so that is added automatically -- you don't need to pass it in.
   * @param  string $method The API method to call, e.g. 'lists/list'
   * @param  array  $args   An array of arguments to pass to the method. Will be json-encoded for you.
   * @return array          Associative array of json decoded API response.
   */
  public function call($method, $args = [])
  {
    return $this->_raw_request($method, $args);
  }

  /**
   * Performs the underlying HTTP request. Not very exciting
   * @param  string $method The API method to be called
   * @param  array  $args   Assoc array of parameters to be passed
   * @return array          Assoc array of decoded result
   */
  private function _raw_request($method, $args = [])
  {
    $args['apikey'] = $this->api_key;

    $url = $this->api_endpoint . '/' . $method . '.json';

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
    curl_setopt($ch, CURLOPT_CAINFO, dirname(__FILE__) . DS . 'cacert.pem');

    curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
    curl_setopt($ch, CURLOPT_USERAGENT, 'PHP-MCAPI/2.0');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($args));
    $result = curl_exec($ch);

    curl_close($ch);

    return $result ? json_decode($result, true) : false;
  }
}
