<?php
/**
 * Class EnerGenieSwitcher
 * @author Florian Arndt <post@florianarndt.com>
 * @author Ulf Haase <ulf.haase@uhsb.de>
 * @package EnerGenie
 * @subpackage 
 * @copyright https://github.com/flowli/EnerGenie-EG-PM2-LAN
 * @version 1.00.00
 */


class EnerGenieSwitcher
	{
	const ON = 1;
	const OFF = 0;
	const TIMEOUT = 1000;
	
	private $debug = true;
	
	/**
	 * Check prerequisites and set-up
	 */
	public function __construct($ip, $password, $debug=false)
		{
		if(!extension_loaded('curl'))
			{
			die('Fatal error: CURL extension needed.');
			}
		$this->ip = $ip;
		$this->password = $password;
		$this->debug = $debug;
		}
	
	public function doLogout()
		{
		$html=$this->postRequest('http://'.$this->ip.'/login.html', array('pw' => ''));
		if (strstr($html, "EnerGenie Web:"))
			$result=TRUE;
		else
			$result=FALSE;
		
		if ($this->debug)
			{
			if ($result)
				echo "Logout ".$this->ip.": successful!!!<br>\n";
			else
				echo "Logout ".$this->ip."-->".$html."<--: failed!!!<br>\n";
			}
			
		return $result;
		}

	public function doLogin()
		{
		$html=$this->postRequest('http://'.$this->ip.'/login.html', array('pw' => $this->password));

		if ($html=="" OR strstr($html, "EnerGenie Web:"))
			$result=FALSE;
		else
			$result=TRUE;
		
		if ($this->debug)
			{
			if ($result)
			echo "Login ".$this->ip.": successful!!!<br>\n";
			else
			echo "Login ".$this->ip.": failed!!!<br>\n";
			}
			
		return $result;
		}

	/**
	 * Get status
	 */
	public function getStatus()
		{
		if ($this->doLogin())
			{
			$html = $this->getRequest('http://'.$this->ip.'/energenie.html', array());
			//echo $this->ip.$html."<hr>";
			preg_match_all('/var sockstates \= \[([0-1],[0,1],[0,1],[0,1])\]/', $html, $matches);
			if(!isset($matches[1][0])) { return false; }
			$states = explode(',', $matches[1][0]);
			$this->doLogout();
			
			return array(1=>$states[0], 2=>$states[1], 3=>$states[2], 4=>$states[3]);
			}
		else
			return false;
		}

	/**
	 * Do the switch
	 */
	public function doSwitch($switches)
		{
		if ($this->doLogin())
			{
			foreach($switches as $port => $state)
				{
				$ports = array(1 => '', 2 => '', 3 => '', 4 => '');
				$ports[$port] = $state;
				$params = array();
				foreach($ports as $port => $state)
					{
					if(in_array($state, array(self::ON, self::OFF)))
			    		{
						$params['cte'.$port] = $state;
						}
					}
				$this->postRequest('http://'.$this->ip, $params);
				}
			$this->doLogout();
			}
		}
	
	function postRequest($url, $fields)
		{
		$fields_string_array = array();
		foreach($fields as $key=>$value)
			{
			$fields_string_array[] = $key.'='.$value;
			}
		$fields_string = join('&', $fields_string_array);
		//open connection
		$ch = curl_init();
		
		// configure
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT_MS, self::TIMEOUT);
		//set the url, number of POST vars, POST data
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_POST, count($fields));
		curl_setopt($ch, CURLOPT_POSTFIELDS, $fields_string);
		
		//execute post
		$result = curl_exec($ch);
		if($this->debug === true)
			{
			echo "Calling " . $url . '?' . $fields_string . "...<br>\n";
			}
		
		//close connection
		curl_close($ch);
		
		// provide html
		return $result;
		}


	function getRequest($url, $fields)
		{
		$fields_string_array = array();
		foreach($fields as $key=>$value)
			{
			$fields_string_array[] = $key.'='.$value;
			}
		$fields_string = join('&', $fields_string_array);
		//open connection
		$ch = curl_init();
		
		// configure
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT_MS, self::TIMEOUT);
		//set the url, number of POST vars, POST data
		curl_setopt($ch, CURLOPT_URL, $url . ($fields_string != '' ? '?' . $fields_string : ''));
		
		//execute post
		$result = curl_exec($ch);
		if($this->debug === true)
			{
			echo "Calling " . $url . '?' . $fields_string . "...<br>\n";
			}
		
		//close connection
		curl_close($ch);
		
		// provide html
		return $result;
		}
	}