#!/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";
require(__DIR__.'/lib/delinstbyid.php');

$opts=array(
	'shuffle'=>false,
	'updstats'=>false,
	'clean'=>false,
	'clean_notifs_before_weeks'=>24,
	'clean_keep_checks'=>16,
	'deleteinstswhere'=>false,
	'optimize'=>false
);

$help='mustool.php
 DESCRIPTION
  mustool.php can do lots of things on Mastodon Help’s database.
 SINOPSIS
  mustool.php [options] <action> [parameters] ...
 Actions
  deleteinstswhere <condition[s]>
   First it returns a list of Instances records matching “condition”, then
   lets you choose whether you want to delete them and all records referencing
   them in other tables.
   Example: mustool.php deleteinstswhere "IsMastodon!=1"
  shuffle
   Randomizes instances list (values in «RPos» column).
  updstats
   Updates site’s statistics.
  clean
   Deletes records older than '.$opts['clean_notifs_before_weeks'].' weeks from
   «Notifications» table.
  optimize
   Optimizes all the tables in the database.
 OPTIONS
  -h, --help
  Shows this help text and exits.

  This program comes with ABSOLUTELY NO WARRANTY; for details see the source.
  This is free software, and you are welcome to redistribute it under
  certain conditions; see <http://www.gnu.org/licenses/> for details.'.N;

$dosome=false;

for ($i=1; $i<$argc; $i++) {
	if (substr($argv[$i],0,1)=='-') {
		switch($argv[$i]) {
			case '-h':
			case '--help':
			mexit($help,0);
			break;
			default:
			mexit('Option «'.$argv[$i].'» is unknown (use «-h» to read help).'.N,1);
			break;
		}
	} elseif ($argv[$i]=='deleteinstswhere') {
		if ($i==$argc-1) mexit('«'.$argv[$i].'» requires a MySQL condition as an argument (use «-h» to read help).'.N,1);
		$i++;
		$dosome=true;
		$opts['deleteinstswhere']=true;
		$opts['deleteinstswhereconds']=$argv[$i];
	} elseif ($argv[$i]=='shuffle') {
		$dosome=true;
		$opts['shuffle']=true;
	} elseif ($argv[$i]=='updstats') {
		$dosome=true;
		$opts['updstats']=true;
	} elseif ($argv[$i]=='clean') {
		$dosome=true;
		$opts['clean']=true;
	} elseif ($argv[$i]=='optimize') {
		$dosome=true;
		$opts['optimize']=true;
	} else {
		mexit('«'.$argv[$i].'» is an unknown action (use «-h» to read help).'.N,1);
	}
}

if (!$dosome) mexit('No actions was specified (use «-h» to read help).'.N,1);

use function mysqli_real_escape_string as myesc;

$inifp=__DIR__.'/../conf/mustard.ini';
$iniarr=@parse_ini_file($inifp)
	or mexit('Could not open configuration file «'.$inifp.'»'.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);

if ($opts['deleteinstswhere']) {
	$res=myq($link,'SELECT ID, URI FROM Instances WHERE '.$opts['deleteinstswhereconds']);
	$buf=[];
	while ($row=mysqli_fetch_assoc($res)) $buf[]=$row;
	$cbuf=count($buf);
	if ($cbuf>0) {
		foreach ($buf as $row) echo($row['URI'].' (ID='.$row['ID'].')'.N);
		echo('Do you really want to delete those '.$cbuf.' record(s)? Enter «YES» to do it, anything else to not do it: ');
		$inp=rtrim(fgets(STDIN));
		if ($inp=='YES') {
			$i=0;
			foreach ($buf as $row) {
				$i++;
				echo('Deleting Instances record with ID = '.$row['ID'].' and URI = «'.$row['URI'].'», and all references to it ('.$i.'/'.$cbuf.', '.round(100/$cbuf*$i,2).'%) ...'.N);
				$res=delinstbyid($link,$row['ID'],'eecho',N);
				if (!$res) mexit('Error trying to delete Instances record with ID='.$row['ID'].'; see the log above for more info.'.N);
				if ($i<$cbuf) echo('---'.N);
			}
		}
	} else {
		echo('No Instances records match expression «'.$opts['deleteinstswhereconds'].'».'.N);
	}
}

if ($opts['shuffle']) {
	echo('Randomizing values in «RPos» column ... ');
	$res=myq($link,'SELECT ID FROM Instances');
	$i=0;
	while ($row=mysqli_fetch_assoc($res)) {
		$i++;
		$buf[$row['ID']]=$i;
	}
	shuffle($buf);
	foreach ($buf as $key=>$val)
		myq($link,'UPDATE Instances SET RPos='.$val.' WHERE ID='.$key);
	echo('done! Affected rows: '.count($buf).'.'.N);
}

if ($opts['updstats']) {
	$day=24*60*60;
	$now=time();
	$tdstart=gmmktime(0,0,0,gmdate('n',$now),gmdate('j',$now),gmdate('Y',$now));
	//echo('Today started at '.$tdstart.' ('.gmdate('d M Y H:i:s',$tdstart).').'.N);
	// this below, if enabled with "0==0", populates DESTRUCTIVELY table ZHits for testing purposes
	if (1==0) {
		myq($link,'DELETE FROM ZHits WHERE TS < '.$tdstart);
		myq($link,'DELETE FROM ZStats');
		$uids=array(
		'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
		'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb',
		'cccccccccccccccccccccccccccccccc',
		'dddddddddddddddddddddddddddddddd',
		'eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee',
		'ffffffffffffffffffffffffffffffff'
		);
		$langs=array('ca','de','en','es','fr','gl','it','pt_BR','uk');
		$urls=array('home','instances','about','stats','contribute','404');
		for ($i=0; $i<1460; $i++) myq($link,'INSERT INTO ZHits (UID,URL,Lang,TS) VALUES ("'.$uids[rand(0,count($uids)-1)].'","'.$urls[rand(0,count($urls)-1)].'","'.$langs[rand(0,count($langs)-1)].'",'.rand($now-365*24*60*60,$tdstart).')');
	}
	$res=myq($link,'SELECT * FROM ZHits WHERE TS < '.$tdstart.' ORDER BY TS ASC');
	if (mysqli_num_rows($res)>0) {
		$row=mysqli_fetch_assoc($res);
		$dstart=gmmktime(0,0,0,gmdate('n',$row['TS']),gmdate('j',$row['TS']),gmdate('Y',$row['TS']));
		echo('Updating statistics ... ');
	} else {
		echo('Statistics are already up to date :-)'.N);
		mysqli_close($link);
		exit(0);
	}
	$inserts=0;
	while ($dstart<$tdstart) {
		//echo('-------- '.gmdate('d M Y H:i:s',$dstart).' ---------'.N);
		$inserts++;
		$hits=0;
		// this line below must be synced with $supplangs in ../site/index.php
		$hitslang=array('ca'=>0, 'de'=>0, 'en'=>0, 'es'=>0, 'fr'=>0, 'gl'=>0, 'it'=>0, 'pt_BR'=>0, 'uk'=>0);
		// this line below must be synced with the urls we consider, see ../site/index.php
		$hitspage=array('home'=>0, 'instances'=>0, 'users'=>0, 'about'=>0, 'stats'=>0, 'contribute'=>0, '404'=>0);
		$visits=0;
		$buf=array();
		$res=myq($link,'SELECT * FROM ZHits WHERE TS >= '.$dstart.' AND TS < '.($dstart+$day).' ORDER BY TS ASC');
		while ($row=mysqli_fetch_assoc($res)) {
			//echo($row['UID'].' '.$row['URL'].' '.$row['Lang'].' '.$row['TS'].N);
			$hits++;
			$hitslang[$row['Lang']]++;
			$hitspage[$row['URL']]++;
			if (!in_array($row['UID'],$buf)) {
				$buf[]=$row['UID'];
				$visits++;
			}
		}
		$buf='';
		foreach ($hitslang as $key=>$val) $buf.=$key.':'.$val.';';
		$hitslang=substr($buf,0,-1);
		$buf='';
		foreach ($hitspage as $key=>$val) $buf.=$key.':'.$val.';';
		$hitspage=substr($buf,0,-1);
		//echo('>>> hits: '.$hits.', hitslang: '.$hitslang.', hitspage: '.$hitspage.', visits: '.$visits.' <<<'.N);
		$query='INSERT INTO ZStats (TS, Hits, HitsLang, HitsPage, Visits) VALUES ('.$dstart.', '.$hits.', "'.$hitslang.'", "'.$hitspage.'", '.$visits.')';
		//echo($query.N);
		myq($link,$query);
		$dstart+=$day;
	}
	myq($link,'DELETE FROM ZHits WHERE TS < '.$tdstart);
	echo('done! Affected rows: '.$inserts.'.'.N);
}

if ($opts['clean']) {
	$ago=time()-($opts['clean_notifs_before_weeks']*7*24*60*60);
	echo('Cleaning records older than '.$opts['clean_notifs_before_weeks'].' weeks from «Notifications» table...'.N);
	$res=myq($link,'DELETE FROM Notifications WHERE Microtime < '.$ago);
	echo('Done! Affected rows: '.mysqli_affected_rows($link).'.'.N);
	echo('Cleaning records from «InstChecks» table, keeping only the most recent '.$opts['clean_keep_checks'].' for each instance...'.N);
	$res=myq($link,'SELECT ID FROM Instances WHERE TotChecks > '.$opts['clean_keep_checks']);
	$nrows=mysqli_num_rows($res);
	$p=0;
	$totar=0;
	while ($row=mysqli_fetch_assoc($res)) {
		$p++;
		//echo('Working on instance '.$p.'/'.$nrows.' (ID = '.$row['ID'].')...'.N);
		$rres=myq($link,'SELECT Time FROM InstChecks WHERE InstID='.$row['ID'].' ORDER BY Time DESC');
		$instchecks=[];
		while ($rrow=mysqli_fetch_assoc($rres)) $instchecks[]=$rrow;
		if (count($instchecks)>$opts['clean_keep_checks']) {
			while(count($instchecks)>$opts['clean_keep_checks']) $bef=array_pop($instchecks);
			$bef=$bef['Time'];
			myq($link,'DELETE FROM InstChecks WHERE InstID='.$row['ID'].' AND Time<='.$bef);
			$ar=mysqli_affected_rows($link);
			//echo('Deleted '.$ar.' records from InstChecks table.'.N);
			$totar+=$ar;
		} else {
			//echo('No InstChecks records to delete.'.N);
		}
	}
	echo('Done! Total affected rows: '.$totar.'.'.N);
}

if ($opts['optimize']) {
	echo('Optimizing all the tables in the database...'.N);
	$res=myq($link,'SHOW TABLES');
	while ($row=mysqli_fetch_row($res)) {
		$rres=myq($link,'OPTIMIZE TABLE '.$row[0]);
		$rrow=mysqli_fetch_assoc($rres);
		if ($rrow['Msg_type']=='error' || $rrow['Msg_type']=='warning')
			fwrite(STDERR,kimplode($rrow).N);
	}
	echo('Done!'.N);
}

mysqli_close($link);

exit(0);

function kimplode(&$arr) {
	$buf=[];
	foreach ($arr as $key=>$val)
		$buf[]=$key.': '.$val;
	return(implode('; ',$buf));
}

function myq(&$link,$query) {
	try {
		$res=mysqli_query($link,$query);
	}
	catch (Exception $error) {
		mexit('Query «'.$query.'» failed: '.$error->getMessage().'.'.N,2);
	}
	// for php versions < 8, which seem to not catch mysql exceptions
	if ($res===false) {
		mexit('Query «'.$query.'» failed: '.mysqli_errno($link).': '.mysqli_error($link).'.'.N,2);
	}
	return($res);
}

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

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

?>