<?php

/**
 * Super-simple, minimum abstraction MailChimp API v2 wrapper
 *
 * Uses curl if available, falls back to file_get_contents and HTTP stream.
 * This probably has more comments than code.
 *
 * Contributors:
 * Michael Minor <me@pixelbacon.com>
 * Lorna Jane Mitchell, github.com/lornajane
 *
 * @author Drew McLellan <drew.mclellan@gmail.com>
 * @version 1.1.1
 */
class IPT_FSQM_INTG_MailChimp
{
	private $api_key;
	private $api_endpoint = 'https://<dc>.api.mailchimp.com/2.0';
	private $verify_ssl   = false;

	/**
	 * Create a new instance
	 * @param string $api_key Your MailChimp API key
	 */
	function __construct($api_key)
	{
		$this->api_key = $api_key;
		list(, $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=array(), $timeout = 10)
	{
		return $this->makeRequest($method, $args, $timeout);
	}

	/**
	 * Performs the underlying HTTP request. Not very exciting
	 * @param  string $method The API method to be called
	 * @param  array  $args   Assoc array of parameters to be passed
	 * @return array          Assoc array of decoded result
	 */
	private function makeRequest($method, $args=array(), $timeout = 10)
	{
		$args['apikey'] = $this->api_key;

		$url = $this->api_endpoint.'/'.$method.'.json';
		$json_data = json_encode($args);

		if (function_exists('curl_init') && function_exists('curl_setopt')){
			$ch = curl_init();
			curl_setopt($ch, CURLOPT_URL, $url);
			curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
			curl_setopt($ch, CURLOPT_USERAGENT, 'PHP-MCAPI/2.0');
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
			curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
			curl_setopt($ch, CURLOPT_POST, true);
			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, $this->verify_ssl);
			curl_setopt($ch, CURLOPT_POSTFIELDS, $json_data);
			$result = curl_exec($ch);
			curl_close($ch);
		} else {
			$result    = file_get_contents($url, null, stream_context_create(array(
				'http' => array(
					'protocol_version' => 1.1,
					'user_agent'       => 'PHP-MCAPI/2.0',
					'method'           => 'POST',
					'header'           => "Content-type: application/json\r\n".
										  "Connection: close\r\n" .
										  "Content-length: " . strlen($json_data) . "\r\n",
					'content'          => $json_data,
				),
			)));
		}

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