<?php


/*


 * Gallery - a web based photo album viewer and editor


 * Copyright (C) 2000-2001 Bharat Mediratta


 * 


 * 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 2 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, write to the Free Software


 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.


 */





/*


 * This block selects a random photo for display.  It will only display photos


 * from albums that are visible to the public.  It will not display hidden


 * photos.  


 *


 * Once a day (or whatever you set CACHE_EXPIRED to) we scan all albums and


 * create a cache file listing each public album and the number of photos it


 * contains.  For all subsequent attempts we use that cache file.  This means


 * that if you change your albums around it may take a day before this block


 * starts (or stops) displaying them.


 */





// Hack prevention.


if (!empty($HTTP_GET_VARS["GALLERY_BASEDIR"]) ||


      !empty($HTTP_POST_VARS["GALLERY_BASEDIR"]) ||


      !empty($HTTP_COOKIE_VARS["GALLERY_BASEDIR"])) {


   print "Security violation\n";


   exit;


}





$GALLERY_BASEDIR = "/home/rantman/public_html/modules/gallery/";


require($GALLERY_BASEDIR . "init.php");





if ($profile) {


    $timer = time();


}





/* Initializing the seed */


srand ((double) microtime() * 1000000);





define(CACHE_FILE, $gallery->app->albumDir . "/block-random.cache");


define(CACHE_EXPIRED, 86400);





// Check the cache file to see if it's up to date


$rebuild = 1;


if (fs_file_exists(CACHE_FILE)) {


    $stat = fs_stat(CACHE_FILE);


    $mtime = $stat[9];


    if (time() - $mtime < CACHE_EXPIRED) {


   $rebuild = 1;


    }


}





if ($rebuild) {


    scanAlbums();


    saveCache();


} else {


    readCache();


}





$album = chooseAlbum();





if ($album) {


    $index = choosePhoto($album);


}





if (isset($index)) {


    $id = $album->getPhotoId($index);


    $url = "http://www.sportsrant.com/";


    $url .= "modules.php?set_albumName=".$album->fields["name"];


    $url .= "&id=" .$id;


    $url .= "&op=modload&name=gallery&file=index&include=view_photo.php";


//    echo"$url";





    echo "<center>"


       ."<a href=\"$url\">"


//       ."<a href=" .makeAlbumUrl($album->fields["name"], $id) .">"


       .$album->getThumbnailTag($index)


       ."</a></center>";


    


    $caption = $album->getCaption($index);


    if ($caption) {


   echo "<br><center>$caption</center>";


    }


    


    $albumURL = "http://www.sportsrant.com/";


    $albumURL .= "modules.php?set_albumName=".$album->fields["name"];


    $albumURL .= "&op=modload&name=gallery&file=index&include=view_album.php";


    echo "<br><center>From: "


            ."<a href=\"$albumURL\">"


//       ."<a href=" .makeAlbumUrl(currentAlbum) .">"


       .$album->fields["title"]


       ."</a></center>";


} else {


   print "No photo chosen.";


}





if ($profile) {


    $elapsed = time() - $timer;


    print "<br>Elapsed: $elapsed secs";


}





/*


 * --------------------------------------------------


 * Support functions


 * --------------------------------------------------


 */





function saveCache() {


    global $cache;


    if ($fd = fs_fopen(CACHE_FILE, "w")) {


   foreach ($cache as $key => $val) {


       fwrite($fd, "$key/$val\n");


   }


   fclose($fd);


    }


}





function readCache() {


    global $cache;


    if ($fd = fs_fopen(CACHE_FILE, "r")) {


   while ($line = fgets($fd, 4096)) {


       list($key, $val) = explode("/", $line);


       $cache[$key] = $val;


   }


   fclose($fd);


    }


}





function choosePhoto($album) {


    global $cache;





    $count = $cache[$album->fields["name"]];


    if ($count == 0) {


   // Shouldn't happen


   return null;


    } else if ($count == 1) {


   $choose = 1;


    } else {


   $choose = rand(1, $count);


   $wrap = 0;


   if ($album->isHidden($choose)) {


       $choose++;


       if ($choose > $album->numPhotos(1)) {


      $choose = 1;


      $wrap++;





      if ($wrap = 2) {


          return null;


      }


       }


   }


    }





    return $choose;


}





function chooseAlbum() {


    global $cache;





    /*


     * The odds that an album will be selected is proportional


     * to the number of (visible) items in the album.


     */





    $total = 0;


    foreach ($cache as $name => $count) {


   if (!$choose) {


       $choose = $name;


   }


   


   $total += $count;


   if ($total != 0 && ($total == 1 || rand(1, $total) <= $count)) {


       $choose = $name;


   }


    }





    if ($choose) {


   $album = new Album();


   $album->load($choose);


   return $album;


    } else {


   return null;


    }


}





function scanAlbums() {


    global $cache;


    global $gallery;





    $cache = array();


    $everybody = $gallery->userDB->getEverybody();


    $albumDB = new AlbumDB();


    foreach ($albumDB->albumList as $tmpAlbum) {


   if ($everybody->canReadAlbum($tmpAlbum)) {


       $seeHidden = $everybody->canWriteToAlbum($tmpAlbum);


       $numPhotos = $tmpAlbum->numPhotos($seeHidden);


       $name = $tmpAlbum->fields["name"];


       if ($numPhotos > 0) {


      $cache[$name] = $numPhotos;


       }


   }


    }


}


?>