<?php
/***************************************************************************
 *  For license information see doc/license.txt
 *
 *  Unicode Reminder メモ
 *
 *  retrieves data from pictures table for log picture stats and galleries;
 *  data is mostly processed within res_logpictures.tpl
 ***************************************************************************/

// This kind of purpose definition may be suboptimal. If functions need
// to be reused of other purpose, change naming according to the retrieved
// data set instead of destination view.

define('LOGPICS_FOR_STARTPAGE_GALLERY',  1);
define('LOGPICS_FOR_NEWPICS_GALLERY',    2);
define('LOGPICS_FOR_USER_STAT',          3);
define('LOGPICS_FOR_USER_GALLERY',       4);  // params: userid, startat
define('LOGPICS_FOR_MYHOME_GALLERY',     5);
define('LOGPICS_FOR_CACHE_STAT',         6);  // params: cacheid
define('LOGPICS_FOR_CACHE_GALLERY',      7);  // params: userid, cacheid
	

function get_logpics($purpose, $userid=0, $cacheid=0, $startat=0)
{
	global $login;
	
	$fields =      "`pics`.`uuid` AS `pic_uuid`, `pics`.`url` AS `pic_url`,
			            `pics`.`title`, `pics`.`date_created`,
			            `logs`.`user_id`, `logs`.`cache_id`,
			            `logs`.`date` AS `logdate`, `pics`.`date_created` < LEFT(NOW(),4) AS `oldyear`,
									`logs`.`id` AS `logid`, `logs`.`type` AS `logtype`";
	$join_logs =   "INNER JOIN `cache_logs` `logs` ON `logs`.`id`=`pics`.`object_id`";
	$join_caches = "INNER JOIN `caches` ON `caches`.`cache_id`=`logs`.`cache_id`";
	$join_cachestatus = 
                 "INNER JOIN `cache_status` ON `caches`.`status`=`cache_status`.`id` AND `allow_user_view`=1";
	$join_user   = "INNER JOIN `user` ON `user`.`user_id`=`logs`.`user_id`";
	
	$rs = false;

	switch ($purpose)
	{
		case LOGPICS_FOR_STARTPAGE_GALLERY:
			// one pic per user and day, 
			// one pic per cache and day
			// no spoilers, no bad data, no invisible or unpublished caches
	
			// The group-by via nested query make this whole thing sufficiently performant.
			// Direct group-bys combined with the wheres are awful slow, and no kind of
			// index seems to be good enough to speed it up.

			// Indexing the for the inner WHERE seems rather useless, as it filters out
			// only a few percent of caches. We must rely on fast data caching.
			
			$rs = sql_slave(
				"SELECT $fields, `user`.`username`, `pics`.`date_created` AS `picdate`
				   FROM (SELECT * FROM
				            (SELECT `uuid`, `url`, `title`, `date_created`, `object_id` FROM `pictures`
  		               WHERE `local`=1 AND `display`=1 AND `spoiler`=0 AND `unknown_format`=0
	                	       AND `object_type`=1
	                   ORDER BY `date_created` DESC
		                 LIMIT 120) `piics`  
				  			     /* 20 times reserve for filtering out user dups, cache dups and invisibles */
                    GROUP BY `object_id`, LEFT(`date_created`,10)) `pics`   /* max. 1 pic per cache and day */
           $join_logs
           $join_caches
           $join_cachestatus
           $join_user
           GROUP BY `user`.`user_id`, LEFT(`pics`.`date_created`,10)  /* max. 1 pic per user and day */
	         ORDER BY `pics`.`date_created` DESC
					 LIMIT 6");
				break;
				
			case LOGPICS_FOR_NEWPICS_GALLERY:
				// like above, without the "one pic per cache and day" condition
				// This saves us one grouped subquery.

				$rs = sql_slave(
					"SELECT $fields, `user`.`username`, `pics`.`date_created` AS `picdate`
             FROM (SELECT `uuid`, `url`, `title`, `date_created`, `object_id` FROM `pictures`
								        WHERE `local`=1 AND `display`=1 AND `spoiler`=0 AND `unknown_format`=0
			                        AND `object_type`=1
		  	             ORDER BY `date_created` DESC
			                  LIMIT 480) `pics`
			                  /* 10 times reserve for filtering out user dups and invisibles */
    	       $join_logs
    	       $join_caches
    	       $join_cachestatus
    	       $join_user
			       GROUP BY `user`.`user_id`, LEFT(`pics`.`date_created`,10)
			       ORDER BY `date_created` DESC
							    LIMIT &1", MAX_PICTURES_PER_GALLERY_PAGE);
				break;
				
			case LOGPICS_FOR_USER_STAT:
				// just count all the logpics of one user
				
				// It's faster, sensible and consistend with cache and log handling to count
				// also invisible data here. Actually, it is present, the pic was made and
				// uploaded with a log, and it is still visible for the logger himself
				// (and hopfully some time for all, independend of the invisible listing!).
				
				$result = sql_value_slave(
							"SELECT COUNT(*)
		             FROM `pictures` `pics`
			           $join_logs
					      WHERE `pics`.`object_type`=1 AND `logs`.`user_id`='&1'", 
								0, $userid); 
				break;
				
			case LOGPICS_FOR_USER_GALLERY:
				// all pics of one user, except spoilers and invisibles

				$rs = sql("SELECT $fields, `logs`.`date` AS `picdate`
			      	       FROM `pictures` `pics`
		                 $join_logs
		                 $join_caches
		                 $join_cachestatus
		                WHERE `object_type`=1 AND `logs`.`user_id`='&1' AND NOT `spoiler`
				         ORDER BY `logs`.`date` DESC
								    LIMIT &2, &3", $userid, $startat, MAX_PICTURES_PER_GALLERY_PAGE+1);
				break;
				         
			case LOGPICS_FOR_MYHOME_GALLERY:
				// all picture of one user, with the only exception of zombie pix hanging
				// by an old log deletion (we should remove those ...)
				
				$rs = sql("SELECT $fields, `logs`.`date` AS `picdate`
	                   FROM `pictures` AS `pics`
                     $join_logs
                    WHERE `object_type`=1 AND `logs`.`user_id`='&1' 
                 ORDER BY `logs`.`date` DESC", $login->userid);

				break;
				
			case LOGPICS_FOR_CACHE_STAT:
				// all pictures for a cache
				// need not to exclude invisible caches, as this is only displayed in listing view

				$result = sql_value(
				          "SELECT COUNT(*)
				             FROM `pictures` AS `pics`
				             $join_logs
                    WHERE `object_type`=1 AND `logs`.`cache_id`='&1'",
                    0, $cacheid);
				break; 

			case LOGPICS_FOR_CACHE_GALLERY:
				// all picture for a cache
				// for all users except owner: also excluding invisble caches
					
				$rs = sql("SELECT $fields, `user`.`username`, `logs`.`date` AS `picdate`
	                   FROM `pictures` AS `pics`
	                   $join_logs " .
	                   ($userid == $login->userid ? "" : "$join_caches $join_cachestatus") . "
	                   $join_user
                    WHERE `object_type`=1 AND `logs`.`cache_id`='&1'
                 ORDER BY `logs`.`date` DESC
								    LIMIT &2", $cacheid, MAX_PICTURES_IN_CACHE_GALLERY+1);
				break; 
				
			default:
				global $tpl;
				$tpl->error(ERROR_INVALID_OPERATION);
				return null;
	}
	
	if ($rs !== false)
	{
		$result = sql_fetch_assoc_table($rs);
		while (count($result) % 6)
			// fill up table to full line length, so that < 6 pics do not spread over the table width
			$result[] = array('pic_uuid' => '');
	}
	
	return $result;
}

				
?>