#!/usr/bin/php
<?php

/*
  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 3 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, see <http://www.gnu.org/licenses/>.
*/

const N="\n";
define('SNAME',basename(__FILE__));
const CONFIGFP=__DIR__.'/../../conf/mustard.ini';

require '../../lib/grace.php';

$help='SYNOPSYS
 '.SNAME.' [options]
DESCRIPTION
  This is a script to set the new «ChecksAtLastOk», «LastCheckTS» and
  «ChecksAtLast» columns of «Peers» table according to its «LastOkCheckTS»
  column.
OPTIONS
 -h, --help
  Show this help text and exit.'.N;

for ($i=1; $i<$argc; $i++) {
	if ($argv[$i]=='-h' || $argv[$i]=='--help') {
		mexit($help,0);
	} else {
		mexit('Don’t know how to interpret «'.$argv[$i].'», please read the help text using «-h» or «--help» option.'.N,1);
	}
}

use function mysqli_real_escape_string as myesc;

$iniarr=@parse_ini_file(CONFIGFP)
	or mexit('Could not open config file «'.CONFIGFP.'».'.N,1);

try { $link=@mysqli_connect($iniarr['db_host'],$iniarr['db_admin_name'],$iniarr['db_admin_password'],$iniarr['db_name'],$iniarr['db_port'],$iniarr['db_socket']); }
catch (Exception $error) { mexit('could not connect to MySQL server: '.mysqli_connect_error().'.'.N,1,true); }
// for php versions < 8
if ($link===false) mexit('could not connect to MySQL server: '.mysqli_connect_error().'.'.N,1,true);
try { $res=mysqli_set_charset($link,'utf8mb4'); }
catch (Exception $error) { mexit('could not set «utf8mb4» charset for MySQL: '.mysqli_error($link).'.'.N,1,true); }
// for php versions < 8
if ($res===false) mexit('could not set MySQL charset: '.mysqli_errno($link).': '.mysqli_error($link).'.'.N,1,true);

$now=time();
$peers=[];
$res=myq($link,'SELECT * FROM Peers');
while ($row=mysqli_fetch_assoc($res)) $peers[]=$row;
$cpeers=count($peers);
$i=0;
$now=time();
foreach ($peers as $peer) {
	$i++;
	echo('Working on peer '.$i.'/'.$cpeers.' ('.round($i*100/$cpeers,2).'%) with ID = '.$peer['ID'].' and Hostname = «'.$peer['Hostname'].'».'.N);
	$que='UPDATE Peers SET ';
	if (!is_null($peer['LastOkCheckTS']))
		$que.='ChecksAtLastOk='.round(($peer['LastOkCheckTS']-$peer['FirstCheckTS'])/86400).', ';
	$que.='LastCheckTS='.$now.', ChecksAtLast='.round(($now-$peer['FirstCheckTS'])/86400).' WHERE ID='.$peer['ID'];
	echo 'Executing query «'.$que.'» ...'.N;
	myq($link,$que);
}
mysqli_close($link);
echo('Done updating '.$cpeers.' «Peers» records :-).'.N);
exit(0);


// functions

function myq(&$l,$q) {
	try {
		$res=mysqli_query($l,$q);
	}
	catch (Exception $e) {
		echo('query «'.$q.'» failed: '.$e->getMessage().' (error code: '.$e->getCode().').'.N);
		exit(3);
	}
	if ($res===false) {
		echo('query «'.$q.'» failed: '.mysqli_errno($l).': '.mysqli_error($l).'.'.N);
		exit(3);
	}
	return($res);
}

function mexit($msg,$code) {
	global $link;
	if (isset($link) && $link!==false) mysqli_close($link);
	if ($code>0)
		fwrite(STDERR,$msg);
	else
		echo($msg);
	exit($code);
}

function utstd($val) {
	if (is_null($val)) return(null);
	$val=round($val);
	return(date('Y-m-d H:i:s',$val));
}

function pr($val) {
	if (is_null($val)) return('NULL');
	return($val);
}

function eecho($msg) {
	echo($msg);
}

?>