/**
 * Main file of the online gallery. This script is used to browse folders and downloadable files.
 * Links are created on specified files (ZIP, RAR, ...) using images (PNG, GIF, ...) to display them.
 *
 * @version 1.0
 * @author Patrick Janser
 * @copyright Cadwork Informatique Lausanne
 **/

define('DEBUG_ECHO_ON', true);

// Name of the directory containing all the PHP, HTML sources and images.
// This value can be changed if you need to change the directory's name.
define('SOURCE_DIRECTORY', 'http_site');

// Do not change these 3 constants.
define('ROOT_RELATIVE', './');
define('ROOT_ABSOLUTE', dirname(__FILE__) . '/');
$PHP_SELF = basename(__FILE__); // The $PHP_SELF constant is not always available. Create it ourself.

// Template manipulation.
require_once(ROOT_ABSOLUTE . SOURCE_DIRECTORY . '/template.php');
// Several usefull functions (like getFiles, echoArray, ...).
require_once(ROOT_ABSOLUTE . SOURCE_DIRECTORY . '/tools.php');

//------------------------------------------- CONSTANTS -----------------------------------------------//

// The directories to ignore.
$IGNORED_DIRECTORIES = array(SOURCE_DIRECTORY, 'aspnet_client');

// Title of the page.
$TITLE = '<H1>Cadwork Online Catalog</H1>';

// Extension of the downloadable files on wich we have to create links. (Without the point)
$DOWNLOADABLE_EXTENSIONS = array('zip', 'rar',
                                 '2dc', '3dc', '3d', '2dv', '2d',
                                 'iv', 'ivx', 'ivxl', 'caz');

// Extension of the images used for the links on the dowloadable files. (Without the point)
$THUMBNAIL_EXTENSIONS = array('png', 'gif', 'jpg', 'jpeg', 'wbmp');

// Thumbnail dimensions in pixels.
$THUMBNAIL_WIDTH = 80;
$THUMBNAIL_HEIGHT = 80;

// Default, min and max number of columns of the main table.
$DEFAULT_NBR_COLUMNS = 8;
$MIN_NBR_COLUMNS = 4;
$MAX_NBR_COLUMNS = 16;

// The message when the folder doesn't contain any ZIP or RAR files.
$EMPTY_FOLDER = 'The folder is empty...';

//------------------------------------------- VARIABLES -----------------------------------------------//

// Absolute path. Created with root path and relative path.
$absolutePath = '';
// Path recieved from the browser client. This is path is relative of the root path.
$relativePath = '';
// The relative path is sent by GET parameters. All the special chars are encoded for hyperlink ref.
$folderHref = '';
// Browsable path. Will contain HTML code and be displayed under the header.
$browsablePath = '';
// Array containing the content of each cell of the main thumbnails table.
$thumbnails = array();
// The links to the current folder sub-directories.
$folderSubDirs = '';
// The content of current folder. Will contain the gallery itself.
$folderContent = '';
// In case of error. (For example if invalid path given by GET parameters)
$errorContent = '';
// Page footer.
$footer = date('d F Y - H:i');
// Create a new instance of the template class.
// The constructor parameter is the name of the directory containing the html files.
$t = new Template(ROOT_ABSOLUTE . SOURCE_DIRECTORY . '/templates');

//--------------------------------------- HTML TEMPLATES ----------------------------------------------//

// Define the used html files.
$t->set_file(array('mainPage'  => 'index.htm',
                   'thumbnail' => 'thumbnail.htm',
                   'folder'    => 'folder.htm'));

//---------------------------------- CHECK RECIEVED PARAMETERS ----------------------------------------//

// Check if the relative path has been given or not by GET method (via URL).
if (($relativePath = getRequest('path')) != "") {
  // Verify if given path does not contain ".." and exists. If not, use home path.
  if (strpos($relativePath, '..') !== false ||
      !is_dir(ROOT_ABSOLUTE . $relativePath)  ) {
    $errorContent .= '<P class="error">"' . htmlentities($relativePath);
    $errorContent .= "\" is an invalid path ! Back to home directory...</P>\n";
    $relativePath = '';
  }
}

// Create absolute path.
$absolutePath = ROOT_ABSOLUTE . $relativePath;

// Check if the number of columns of the main table has been sent by POST (via FORM and option list).
if (($nbrColumns = getRequest('cols')) != '') {
  if (!is_scalar($nbrColumns) || $nbrColumns < $MIN_NBR_COLUMNS || $nbrColumns > $MAX_NBR_COLUMNS) {
    $errorContent .= "<P class=\"error\">Number of columns is invalid !</P>\n";
    $nbrColumns = $DEFAULT_NBR_COLUMNS;
  }
}
else
  $nbrColumns = $DEFAULT_NBR_COLUMNS;

// Check if there is a file to download.
$forceDownloadFile = getRequest('file');

//------------------------------- GENERATE BROWSABLE PATH + OPTION LIST -------------------------------//

// Generate path browser.
$browsablePath .= '<P>' . htmlBrowsablePath($relativePath, $PHP_SELF, "cols=$nbrColumns") . "</P>\n";

// Generate option list for selection of the number of columns to display.
$optionColumns = '';
for ($i = $MIN_NBR_COLUMNS; $i <= $MAX_NBR_COLUMNS; $i++) {
  if ($i == $nbrColumns)
    $optionColumns .= str_repeat(' ', 16) . "<OPTION value=\"$i\" selected=\"selected\">$i</OPTION>\n";
  else
    $optionColumns .= str_repeat(' ', 16) . "<OPTION value=\"$i\">$i</OPTION>\n";
}

//------------------------------------ GENERATE THE LIST OF DIRECTORIES -------------------------------//

// Get the directories.
$directories = getDirectories($absolutePath);
// Delete the "http_site" directory containing the php script because it musn't be listed.
// Only delete it if we are at the root directory.
//if ($relativePath == "") {
  foreach ($IGNORED_DIRECTORIES as $directory) {
    // Search for the current directory to ignore get its corresponding key.
    $key = array_search($directory, $directories);
    // Delete element from array of directories.
    if (!($key === false)) unset($directories[$key]);
  }
//}

// If there is some directories, then create links to them.
if (count($directories) > 0) {
  // Define a variable contained in another.
  // There are many folderRow items in folder. The append result is folderRows.
  $t->set_var('folderRows', '');
  $t->set_block('folder', 'folderRow', 'folderRows');

  // Create links on all the directories.
  foreach ($directories as $directory) {
    // Create link href.
    $folderHref = "$PHP_SELF?path=";
    if ($relativePath == '')
      $folderHref .= rawurlencode($directory);
    else
      $folderHref .= rawurlencode($relativePath . '/' . $directory);
    $folderHref .= "&cols=$nbrColumns";

    $folderTitle = htmlentities($directory);
    // Replace spaces by an invisibile dot. This will suppress automatic new line formatting.
    $folderTitle = str_replace(' ', '&nbsp;', $folderTitle);

    // Set vars and replace values in the folder template.
    $t->set_var(array('folderHref'      => $folderHref,
                      'folderLinkTitle' => htmlentities($directory),
                      'folderTitle'     => $folderTitle,
                      'sourceDirectory' => SOURCE_DIRECTORY));
    $t->parse('folderRows', 'folderRow', true); // True is to append data into folderRows.
  }
  // Parse and add result to page content.
  $folderSubDirs .= $t->parse('folders', 'folder');
}

$folderSubDirs .= "\n";

//-------------------------------- GET THE LIST OF DOWNLOADABLE FILES ---------------------------------//

// Get all the downloadable files and create the links.
$downloadFiles = getSpecificFiles($absolutePath, $DOWNLOADABLE_EXTENSIONS);

//-------------------------- SEND THE FILE TO THE CLIENT IF IT CORRESPONDS ----------------------------//

if ($forceDownloadFile != '') {
  // This loop is to prevent hackers to download PHP files, or other critical files. (Not optimal)
  foreach ($downloadFiles as $downloadFile) {
    if (strcasecmp($forceDownloadFile, $downloadFile) == 0) {
      if ($relativePath == '')
        $downloadFilePath = $absolutePath . $downloadFile;
      else
        $downloadFilePath = $absolutePath . '/' . $downloadFile;

      if (sendFile($downloadFilePath))
        exit();
      else
        exit('Error while sending file !');
    }
  }
}

//----------------------------- GENERATE THE THUMBNAILS IN A HTML TABLE -------------------------------//

if (count($downloadFiles) > 0) {
  // Define a variable contained in another.
  // There are many thumbnailRow items in thumbnail. The append result is thumbnailRows.
  $t->set_var('thumbnailRows', '');
  $t->set_block('thumbnail', 'thumbnailRow', 'thumbnailRows');

  // Create links on all the downloadable files.
  foreach ($downloadFiles as $downloadFile) {
    // Create link to force the download of the file.
    $downloadHref = "$PHP_SELF?path=" . rawurlencode($relativePath);
    $downloadHref .= "&file=" . rawurlencode($downloadFile);
    $downloadHref .= "&cols=$nbrColumns";

    // Search for image thumbnails.
    $downloadFileInfos = pathinfo($downloadFile);
    foreach ($THUMBNAIL_EXTENSIONS as $thumbnailExtension) {
      $thumbnailFilenames[] = substr($downloadFile, 0, strlen($downloadFile) - strlen($downloadFileInfos['extension']) - 1)
                              . "." . $thumbnailExtension;
    }
    $images = getSpecificFiles($absolutePath, $THUMBNAIL_EXTENSIONS);
    foreach ($thumbnailFilenames as $thumbnailFilename) {
      foreach ($images as $image) {
        if (strcasecmp($thumbnailFilename, $image) == 0) {
          if ($relativePath == '')
            $thumbnailSrc[] = urlEncodeWithoutSlashes($relativePath . $thumbnailFilename);
          else
            $thumbnailSrc[] = urlEncodeWithoutSlashes($relativePath . '/' . $thumbnailFilename);
        }
      }
    }
    // If no image found, then use Zip image.
    if (!isset($thumbnailSrc)) {
      $thumbnailSrc[] = SOURCE_DIRECTORY . "/images/zip_80x80.gif";
    }


    // Set vars and replace values in the folder template.
    $t->set_var(array('downloadHref'      => $downloadHref,
                      'downloadLinkTitle' => htmlentities(str_replace('_', ' ', $downloadFile)),
                      'thumbnailSrc'      => $thumbnailSrc[0],
                      'thumbnailWidth'    => $THUMBNAIL_WIDTH,
                      'thumbnailHeight'   => $THUMBNAIL_HEIGHT));

    $thumbnails[] = $t->parse('thumbnailRows', 'thumbnailRow', true); // True is to append data into folderRows.
    // Unset variable for next image research.
    unset($thumbnailSrc);
    unset($thumbnailFilenames);
  }

  // Parse and add result to page content.
  $folderContent .= htmlTable($thumbnails,                                // array of elements to be put in the cells.
                              $nbrColumns,                                // number of columns.
                              '',                                         // No CSS class name.
                              'border="0" cellspacing="8" cellpadding="0" align="left"', // TABLE tag properties.
                              'height="140"',                             // TR tag properties.
                              'width="110" align="center" valign="top"',  // TD tag properties.
                              '');                                        // Nothing to be put in the empty cells.
}
// No download files are available in the current directory.
else {
  $folderContent .= $EMPTY_FOLDER;
}


//---------------------------- INSERT DYNAMIC DATA FROM PHP INTO HTML TEMPLATES -----------------------//

// Set the variables wich we will insert in the template.
$t->set_var(array('title'           => $TITLE,
                  'browsablePath'   => $browsablePath,
                  'relativePath'    => $relativePath,
                  'sourceDirectory' => SOURCE_DIRECTORY,
                  'optionColumns'   => $optionColumns,
                  'errorContent'    => $errorContent,
                  'folderSubDirs'   => $folderSubDirs,
                  'folderContent'   => $folderContent,
                  'footer'          => $footer));

// Replace all variables in the main page.
$t->pparse('output', 'mainPage');

?>