<?php

class command_handler{

	private $seperator = "/";	// "/" on Linux, "\" on Windows
	private $db = "commands.db";
	private $codedir = "commands";
	private $commands;

	public function __construct(){
		$this -> load();
		$this -> update();
	}

	public function load(){
		if(file_exists($this -> db)){
			$data = file_get_contents($this -> db);
			if(!$this -> commands = unserialize($data)) $this -> commands = array();
			unset($data);
		}
		else $this -> commands = array();
	}

	private function sortCMP($a, $b){
		if($a["level"] == $b["level"]) return (strcmp($a["trigger"], $b["trigger"]) > 0) ? 1 : -1;
		return ($a["level"] < $b["level"]) ? -1 : 1;
	}

	public function sort(){
		//create temporary array
		foreach($this -> commands as $trigger => $arr){
			$temp[$trigger]["array"] = $arr;
			$temp[$trigger]["level"] = $arr["level"];
			$temp[$trigger]["trigger"] = $trigger;
		}

		//sort that temporary array by permission level and alphabetical^^
		usort($temp, array($this, "sortCMP"));

		//store the sorted data again
		unset($this -> commands);
		foreach($temp as $cmd){
			$this -> commands[$cmd["trigger"]]["filename"] = $cmd["array"]["filename"];
			$this -> commands[$cmd["trigger"]]["context"] = $cmd["array"]["context"];
			$this -> commands[$cmd["trigger"]]["level"] = $cmd["array"]["level"];
		}
		unset($temp);
	}

	public function getList($level){
		foreach($this -> commands as $command => $arr){
			//Query commands: * Prefix commands: (prefix) Global commands: nothing
			$char = ($arr["context"] == "query" && $arr["context"] != "global") ? "*" : "#";
			if($arr["level"] <= $level && $arr["context"] != "channel"){
				$c[] = $command.$char."(".$arr["level"].")";
			}
		}
		return implode(", ", $c);
	}

	public function update(){
		//delete non-existing commands
		foreach($this -> commands as $command => $arr){
			if(!file_exists($this -> getPath().$arr["filename"])) $this -> delCode($command);
		}

		//register the new commands
		$files = scandir($this -> codedir);
		foreach($files as $file){
			if(preg_match("/.php$/", $file)) $this -> addCode($file);
		}

		$this -> sort();
		
	}

	public function save(){
		file_put_contents($this -> db, serialize($this -> commands));
	}


	public function __destruct(){
		$this -> save();
	}


	/*
	 * returns code to be evaluated and stuff
	 */
	public function getCode($command, $context, $level){
		if(isset($this -> commands[$command]) && file_exists($this -> getPath().$this -> commands[$command]["filename"])){
			if(($this -> commands[$command]["context"] == $context || $this -> commands[$command]["context"] == "global") && $this -> commands[$command]["level"] <= $level){
				$file = $this -> getPath().$this -> commands[$command]["filename"];
				$replace = array("<?php", "?>");
				$code = str_replace($replace, "", file_get_contents($file));
				//access granted; returning code to eval()
				return str_replace("#BOT_PATH", $this -> getPath(), $code);
			}
			elseif($this -> commands[$command]["context"] != $context && $this -> commands[$command]["context"] != "global"){
				//wrong context!
				return 3;
			}
			else{
				//Permission denied
				return 2;
			}
		}
		else{
			//Command does not exist yet
			return 0;
		}
	}
	
	public function addCode($filename){
		$file = $this -> getPath().$filename;
		if(file_exists($file)){
			$content = file($file);
			if(preg_match("/#BOT_INCLUDE/", $content[1])){
				$data = explode(" ", str_replace("\"", "", $content[1]));
				unset($content);
				$command = trim($data[1]);
				$level = trim($data[3]);
				if(!is_numeric($level)) $level = 0;
				$this -> commands[$command]["filename"] = $filename;
				$this -> commands[$command]["context"] = trim($data[2]);
				$this -> commands[$command]["level"] = $level;
				return true;
			}
			else{
				return false;
			}
		}
		else{
			return false;
		}
	}

	public function delCode($command){
		unset($this -> commands[$command]);
	}

	public function getLevel($command){
		return $this -> commands[$command]["level"];
	}

	public function getContext($command){
		return $this -> commands[$command]["context"];
	}

	private function getPath(){
		return $this -> codedir.$this -> seperator;
	}

}
?>