<?php
// $Id: file_styles.module,v 1.1.2.8.2.11 2011-01-14 20:39:54 aaron Exp $

/**
 *  @file styles/contrib/file_styles/file_styles.module
 *  File widget formatter definitions.
 */

// A registry of variable_get defaults.
include_once('includes/file_styles.variables.inc');

/**
 * Implementation of Styles module hook_styles_register().
 */
function file_styles_styles_register() {
  return array(
    'FileStyles' => array(
      'field_types' => 'file',
      'name' => t('file'),
      'description' => t('file styles'),
      'path' => drupal_get_path('module', 'file_styles') .'/includes/styles',
      'file' => 'FileStyles.inc',
    ),
  );
}

/**
 * Styles filter callback.
 *
 * This will determine the correct style container corresponding to media type.
 */
function file_styles_styles_filter($object, $element = NULL) {
  // Ensure we're working against the fully loaded file object.
  $file = file_uri_to_object($object->uri);

  // Allow other modules to define their own file styles.
  // In general, they'll most likely want to check against the mimetype.
  $containers = styles_default_containers('file');
  $filters = module_invoke_all('file_styles_filter', $object);

  foreach ($filters as $filter) {
    if (isset($containers['containers'][$filter])) {
      return $filter;
    }
  }

  // Now check the part of the mimetype before the slash.
  // Note that we can't use strstr($haystack, $needle, $before_needle)
  // < PHP 5.3, so we need a work-around.
  $filter = file_styles_strstr($object->filemime, '/', TRUE);
  if (isset($containers['containers'][$filter])) {
    return $filter;
  }

  // Fallback to default.
  return 'default';
}

/**
 * Support for strstr with $before_needle < PHP 5.3.
 */
function file_styles_strstr($haystack, $needle, $before_needle = FALSE){
  if ($before_needle) {
    return array_shift(explode($needle, $haystack, 2));
  }
  return strstr($haystack, $needle);
}

/**
 * Return the path to the image for previews in Styles UI.
 *
 * If it doesn't yet exist, then copy the source to the files directory.
 *
 * @param boolean $replace
 *  If TRUE, then replace the file.
 *
 * @return mixed
 *  The path to the image preview file, or FALSE if unable to copy.
 */
function file_styles_preview_image($replace = FALSE) {
  $path = file_styles_variable_get('preview_image');
  if (!$path || $replace) {
    $dir = file_default_scheme() . '://' . file_styles_variable_get('preview_image_directory');
    if (file_prepare_directory($dir, FILE_CREATE_DIRECTORY)) {
      $source = file_styles_variable_get('image_style_preview_image');
      if ($path = file_unmanaged_copy($source, $dir . '/' . basename($source), FILE_EXISTS_REPLACE)) {
        file_styles_variable_set('preview_image', $path);
      }
    }
  }
  return $path;
}

/**
 * Implementation of hook_theme().
 */
function file_styles_theme($existing, $type, $theme, $path) {
  return array(
    'file_styles_image' => array(
      'variables' => array('image_uri' => '', 'alt' => '', 'title' => '', 'attributes' => array(), 'image_style' => NULL, 'instance' => NULL),
      'file' => 'file_styles.theme.inc',
      'path' => $path . '/includes/themes',
    ),
    'file_styles_image_preview' => array(
      'variables' => array('style_name' => NULL),
      'file' => 'file_styles.theme.inc',
      'path' => $path . '/includes/themes',
    ),
  );
}