<?php
/*
 * PHP library for Mixpanel data API -- http://www.mixpanel.com/
 * Requires PHP 5.2 with JSON
 *
 * This library is used for retrieving data you've already sent to Mixpanel in summary form NOT for sending data to us.
 */

class Mixpanel
{
	private $api_url = 'http://mixpanel.com/api';
	private $version = '1.0';
	private $api_key;
	private $api_secret;
	
	public function __construct($api_key, $api_secret) {
		$this->api_key = $api_key;
		$this->api_secret = $api_secret;
	}
	
	public function request($end_point, $method, $params, $format='json') {
		// $end_point is an API end point such as events, properties, funnels, etc.
		// $method is an API method such as general, unique, average, etc.
		// $params is an associative array of parameters.
		// See http://mixpanel.com/api/docs/guides/api/
		
		if (count($params) < 1)
			return false;
		
		if (!isset($params['api_key']))
			$params['api_key'] = $this->api_key;
		
		$params['format'] = $format;
		
		if (!isset($params['expire'])) {
			$current_utc_time = time() - date('Z');
			$params['expire'] = $current_utc_time + 600; // Default 10 minutes
		}
		
		foreach ($params as $param => &$value) {
			if (is_array($value))
				$value = json_encode($value);
			//$param_query = null;
			$param_query .= '&' . urlencode($param) . '=' . urlencode($value);
		}
		
		$sig = $this->signature($params);
		
		$uri = 'api/' . $end_point . '/' . $this->version . '/' . $method;
		$request_url = $uri . '?sig=' . $sig . $param_query;
		
		$curl_handle=curl_init();
		curl_setopt($curl_handle,CURLOPT_URL,'http://mixpanel.com/'.$request_url);
		curl_setopt($curl_handle,CURLOPT_CONNECTTIMEOUT,2);
		curl_setopt($curl_handle,CURLOPT_RETURNTRANSFER,1);
		$data = curl_exec($curl_handle);
		curl_close($curl_handle);

		return $data;
	}
	
	private function signature($params) {
		ksort($params);
		//$param_string ='';
		foreach ($params as $param => $value) {
			$param_string .= $param . '=' . $value;
		}
		
		return md5($param_string . $this->api_secret);
	}
	
    //      // Example usage
    //     $api_key = 'your key';
    //     $api_secret = 'your token';
    // 
    //     $mp = new Mixpanel($api_key, $api_secret);
    //     $data = $mp->request('properties', 'unique', array(
    //      'name' => 'domain',
    //      'event' => 'pageview',
    //      'unit' => 'day',
    //      'interval' => '20',
    //      'limit' => '20'
    //      ));
}?>