<?php

require_once ('Config.php');

/**
  * Host.php - manage host creation, update and deletes.
  *
  * obs: each host must have a company associated
  */

class Host {
	var $config;

	var $company;
	var $id;
	var $name;
	var $ip;

	/**
	  * Host Constructor
	  * $host = new Host($config, $id);
	  *
	  * param $config Configuration class
	  * param $id When provided, grab all info for that host
	  */
	function Host ($config, $id="") {
		$this->config = $config;
		if ($id > 0) {
			$this->id = $id;
			$rows = $this->config->select("select id, company_id, name, ip from hosts where id = ?", $id);
			if (isset($rows[0]) && $rows[0]->id > 0) {
				$this->company = new Company($this->config, $rows[0]->company_id);
				$this->name = $rows[0]->name;
				$this->ip = $rows[0]->ip;
			} else {
				error_log("Host not found");
				return false;
			}
		}
		return true;
	}

	/**
	  * Create a new host if there's no host with that name yet.
	  * Construct object first.
	  * $host->create("my company", "myserver.mycompany.com", "127.0.0.1");
	  *
	  * param $company_id The company this host is part
	  * param $name The hostname
	  * param $ip Its IP, if not provided try to check it
	  * return $id Newly created host's ID
	  */
	function create ($company_id, $name, $ip="") {
		if ($this->config->select("select id from hosts where name = ?", $name))
			return false;
		else {
			if (!$ip)
				$this->getIP();
			$values = array($company_id, $name, $ip);
			$this->config->query("insert into hosts values (NULL, ?, ?, ?)", $values);
			$rows = $this->config->select("select last_insert_id() as id");
			$this->id = $rows[0]->id;
			$this->name = $name;
			$this->ip = $ip;
			return $this->id;
		}
	}

	/**
	  * Update the current host on the database using the current parameters. If IP
	  * is empty try again to determine it automatically. This can be used to change
	  * IPs when DNS has changed.
	  * $host->name = "changedname.mycompany.com";
	  * $host->update()
	  */
	function update () {
		if (!$this->ip)
			$this->getIP();
		$values = array( $this->name, $this->ip, $this->id );
		$this->config->query("update hosts set name = ?, ip = ? where id = ?", $values);
	}

	/**
	  * Get the host's IP using system("host hostname") and automatically update $this->ip.
	  * $host->getIP()
	  */
	function getIP () {
		$this->ip = chop(shell_exec("host ".$this->name." | grep address | cut -d \" \" -f 4"));
	}

	/**
	  * Delete the current host IF and only IF there's no probe using it.
	  * $host->delete();
	  */
	function delete () {
		$values = array( $this->id );
		if ($this->config->select("select id from probes where host_id = ?", $values))
			return false;
		else
			$this->config->query("delete from hosts where id = ?", $values);
		return true;
	}

	/**
	  * Dumper.
	  * $host->dump();
	  */
	function dump () {
		print "\t\t* Host: $this->name\n";
		print "\t\t  IP: $this->ip\n";
	}
}
?>