<?php
/*
+---------------------------------------------------------------------------
|   PHP-IRC v2.1.1 Service Release
|   ========================================================
|   by Manick
|   (c) 2001-2004 by http://www.phpbots.org/
|   Contact: manick@manekian.com
|   irc: #manekian@irc.rizon.net
|   ========================================
+---------------------------------------------------------------------------
|   > connection class module
|   > Module written by Manick
|   > Module Version Number: 2.1.2
+---------------------------------------------------------------------------
|   > This program is free software; you can redistribute it and/or
|   > modify it under the terms of the GNU General Public License
|   > as published by the Free Software Foundation; either version 2
|   > of the License, or (at your option) any later version.
|   >
|   > This program is distributed in the hope that it will be useful,
|   > but WITHOUT ANY WARRANTY; without even the implied warranty of
|   > MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
|   > GNU General Public License for more details.
|   >
|   > You should have received a copy of the GNU General Public License
|   > along with this program; if not, write to the Free Software
|   > Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+---------------------------------------------------------------------------
|   Changes
|   =======-------
|   > If you wish to suggest or submit an update/change to the source
|   > code, email me at manick@manekian.com with the change, and I
|   > will look to adding it in as soon as I can.
+---------------------------------------------------------------------------
*/

/* Connection class.  A Layer between dcc/irc class and socket class. */
/* To use, simply create an object, call the calls listed under the constructor in order. */
/* Damn I'm hungry... */

class connection {

	//External Classes
	private $socketClass;
	private $ircClass;
	private $timerClass;

	//Internal variables
	private $callbackClass;
	private $host;
	private $port;
	private $connTimeout;
	private $transTimeout;
	private $sockInt;

	//Function specific
	private $connected;
	private $connStartTime;
	private $lastTransTime;

	//If this is set to true, this connection class will no longer function.
	private $error;
	private $errorMsg;

	//Called first
	function __construct($host, $port, $connTimeout)
	{
		$this->error = true;
		$this->errorMsg = "Connection not initialized";
		$this->host = $host;
		$this->port = $port;
		$this->connTimeout = $connTimeout;
		$this->transTimeout = 0;
		$this->connected = false;
		$this->sockInt = false;
	}

	//Called second
	public function setSocketClass($class)
	{
		$this->socketClass = $class;
	}

	//Called third
	public function setIrcClass($class)
	{
		$this->ircClass = $class;
	}

	//Called fourth
	public function setCallbackClass($class)
	{
		$this->callbackClass = $class;
	}

	//Called fifth
	public function setTimerClass($class)
	{
		$this->timerClass = $class;
	}

	//Called sixth
	public function init()
	{
		$this->error = false;

		if ($this->host != null)
		{
			if ($this->connTimeout <= 0)
			{
				$this->setError("Must set connection timeout > 0 for non-listening sockets");
				return;
			}
		}
		else
		{
			if ($this->connTimeout < 0)
			{
				$this->setError("Must set connection timeout >= 0 for listening sockets");
				return;
			}
		}

		if (!is_object($this->callbackClass))
		{
			$this->setError("Specified callback class is not an object");
			return;
		}

		if (!is_object($this->socketClass))
		{
			$this->setError("Specified socket class is not an object");
			return;
		}

		if (!is_object($this->ircClass))
		{
			$this->setError("Specified irc class is not an object");
			return;
		}

		$sockInt = $this->socketClass->addSocket($this->host, $this->port); // add socket
		if ($sockInt == false)
		{
			$this->setError("Could not create socket");
			return;
		}

		$sockData = $this->socketClass->getSockData($sockInt);

		$this->socketClass->setHandler($sockInt, $this->ircClass, $this, "handle");

		//Set internal variables
		if ($this->port == NULL)
		{
			$this->port = $sockData->port;
		}
		$this->sockInt = $sockInt;

		return $this->port;
	}
	
	public function bind($ip)
	{
		if ($this->error != false || $this->sockInt == false)
		{
			return;
		}

		if ($this->connected == true)
		{
			return;
		}

		$this->socketClass->bindIP($this->sockInt, $ip);
	}
	
	//Called to listen, only called by onAccept() function in this class
	public function listen()
	{
		$this->error = false;
		$this->connected = true;
	}

	//Called last, and only to start connection to another server
	public function connect()
	{
		if ($this->error == true)
		{
			return false;
		}

		if ($this->connTimeout > 0)
		{
			$this->timerClass->addTimer(irc::randomHash(), $this, "connTimeout", "", $this->connTimeout);
		}

		$this->timerClass->addTimer(irc::randomHash(), $this->socketClass, "connectSocketTimer", $this->sockInt, 1);

		/* $this->socketClass->beginConnect($this->sockInt); */
		$this->connStartTime = time();
	}

	public function disconnect()
	{
		unset($this->callbackClass);
		$this->socketClass->killSocket($this->sockInt);
		$this->socketClass->removeSocket($this->sockInt);
		$this->setError("Disconnected from server");
	}

	public function getSockInt()
	{
		return $this->sockInt;
	}

	public function setSockInt($sockInt)
	{
		$this->sockInt = $sockInt;
	}

	public function setTransTimeout($time)
	{
		$this->transTimeout = ($time < 0 ? 0 : $time);
	}

	/* Timers */
	
	public function connTimeout()
	{
		if ($this->connected == false)
		{
			$this->handle(CONN_CONNECT_TIMEOUT);
		}
	}

	public function transTimeout()
	{
		if ($this->error == true)
		{
			return false;
		}

		if ($this->connected == false)
		{
			return true;
		}

		if ($this->transTimeout > 0)
		{
			if (time() > $this->transTimeout + $this->lastTransTime)
			{
				$this->handle(CONN_TRANSFER_TIMEOUT);
			}
		}

		return true;
	}

	//handle function, handles all calls from socket class, and calls appropriate
	//functions in the callback class
	public function handle($msg)
	{

		if ($this->socketClass->getSockStatus($this->sockInt) === false)
		{
			return false;
		}

		$stat = false;

		if ($this->error == true)
		{
			return false;
		}

		switch ($msg)
		{
			case CONN_CONNECT:
				$stat = $this->onConnect();
				break;
			case CONN_READ:
				$stat = $this->onRead();
				break;
			case CONN_WRITE:
				$stat = $this->onWrite();
				break;
			case CONN_ACCEPT:
				$stat = $this->onAccept();
				break;
			case CONN_DEAD:
				$stat = $this->onDead();
				break;
			case CONN_TRANSFER_TIMEOUT:
				$stat = $this->onTransferTimeout();
				break;
			case CONN_CONNECT_TIMEOUT:
				$stat = $this->onConnectTimeout();
				break;
			default:
				return false;
				break;
		}

		return $stat;
	}

	/* Specific handling functions */

	private function onTransferTimeout()
	{
		$this->callbackClass->onTransferTimeout($this);
	}

	private function onConnectTimeout()
	{
		$this->callbackClass->onConnectTimeout($this);
	}

	private function onConnect()
	{
		$this->connected = true;

		if ($this->transTimeout > 0)
		{
			$this->timerClass->addTimer(irc::randomHash(), $this, "transTimeout", "", $this->transTimeout);
		}

		$this->callbackClass->onConnect($this);
		return false;
	}

	//For this function, true can be returned from onRead() to input more data.
	private function onRead()
	{
		$this->lastTransTime = time();

		$stat = $this->callbackClass->onRead($this);
		if ($stat !== true)
		{
			$this->socketClass->clearReadSchedule($this->sockInt);
		}

		return $stat;
	}

	private function onWrite()
	{
		$this->socketClass->clearWriteSchedule($this->sockInt);
		$this->lastTransTime = time();
		$this->callbackClass->onWrite($this);
		return false;
	}

	private function onAccept()
	{
		//Get the sockInt from the socketClass
		$newSockInt = $this->socketClass->hasAccepted($this->sockInt);

		if ($newSockInt === false)
		{
			//False alarm.. just ignore it.
			return false;
		}

		//Create a new connection object for the new socket connection, then return it to onAccept
		//We must assume that onAccept will handle the connection object.  Otherwise it'll die, and the
		//connection will be orphaned.

		$newConn = new connection(null, null, 0);
		$newConn->setSocketClass($this->socketClass);
		$newConn->setIrcClass($this->ircClass);
		$newConn->setCallbackClass($this->callbackClass); //Can be overwritten in the onAccept function
		$newConn->setTimerClass($this->timerClass);
		$newConn->listen();
		//We don't need to call init(), we're already setup.
		
		//Setup our connection transmission timeout thing.
		if ($this->transTimeout > 0)
		{
			$this->timerClass->addTimer(irc::randomHash(), $newConn, "transTimeout", "", $this->transTimeout);
		}
		
		$newConn->setTransTimeout($this->transTimeout);

		//Set handler for our new sockInt to new connection class
		$this->socketClass->setHandler($newSockInt, $this->ircClass, $newConn, "handle");

		//Set our new sockInt
		$newConn->setSockInt($newSockInt);

		//Call our callback function for accepting with old object, and new object.
		$this->callbackClass->onAccept($this, $newConn);
		return false;
	}

	private function onDead()
	{
		if ($this->connected == true)
		{
			$this->setError("Connection is dead");
		}
		else
		{
			$this->setError("Could not connect: " . $this->socketClass->getSockStringError($this->sockInt));
		}
		$this->callbackClass->onDead($this);
		return false;
	}

	/* Error handling routines */

	private function setError($msg)
	{
		$this->error = true;
		$this->errorMsg = $msg;
	}

	public function getError()
	{
		return $this->error;
	}

	public function getErrorMsg()
	{
		return $this->errorMsg;
	}

}

?>