<?php

namespace Proxy\Plugin;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Proxy\Event\ProxyEvent;

abstract class AbstractPlugin implements EventSubscriberInterface {

	// apply these methods only to those events whose request URL passes this filter
	protected $url_pattern;
	
	public function onBeforeRequest(ProxyEvent $event){
		// fired right before a request is being sent to a proxy
	}
	
	public function onHeadersReceived(ProxyEvent $event){
		// fired right after response headers have been fully received - last chance to modify before sending it back to the user
	}
	
	public function onCurlWrite(ProxyEvent $event){
		// fired as the data is being written piece by piece
	}
	
	public function onCompleted(ProxyEvent $event){
		// fired after the full response=headers+body has been read - will only be called on "non-streaming" responses
	}
	
	// dispatch based on filter
	final public function route(ProxyEvent $event, $event_name, EventDispatcherInterface $dispatcher){
	
		$url = $event['request']->getUri();
		
		// url filter provided and current request url does not match it
		if($this->url_pattern){
		    if(strpos($this->url_pattern, '/') === 0){
			    if(!preg_match($this->url_pattern, $url)) 
				return;
			} 
			else
			{
			    if(stripos($url, $this->url_pattern) === false) 
				return;
			}
		}
		
		switch($event_name){
		
			case 'request.before_send':
				$this->onBeforeRequest($event);
			break;
			
			case 'request.sent': 
				$this->onHeadersReceived($event);
			break;
			
			case 'curl.callback.write':
				$this->onCurlWrite($event);
			break;
			
			case 'request.complete':
				$this->onCompleted($event);
			break;
		}
	}
	
	// This method returns an array indexed by event names and whose values are either the method name to call 
	// or an array composed of the method name to call and a priority.
	final public static function getSubscribedEvents(){
		return array(
			'request.before_send' => 'route',
			'request.sent' => 'route',
			'curl.callback.write' => 'route',
			'request.complete' => 'route'
		);
	}
}

?>