<?php

define('IMAGE_ORIGINAL', '_original');
define('IMAGE_PREVIEW', 'preview');
define('IMAGE_THUMBNAIL', 'thumbnail');

define('IMAGE_LINK_HIDDEN', 0);
define('IMAGE_LINK_SHOWN', 1);
define('IMAGE_LINK_NEW', 2);

/**
 * Implementation of hook_help().
 */
function image_legacy_help($path, $arg) {
  switch ($path) {
    case 'admin/help#image_legacy':
      return t('TODO: Create admin help text.');
    // OPTIONAL: Add additional cases for other paths that should display help text.
  }
}


/**
 * Implementation of hook_init().
 */
function image_legacy_init() {

}

/**
 * Implementation of hook_perm
 */
function image_perm() {
  return array('view original images', 'create images', 'edit own images', 'edit any images', 'delete own images', 'delete any images');
}

/**
 * Creates an image filename.
 *
 * @param $filepath
 *   The full path and filename of the original image file,relative to Drupal
 *   root, eg 'sites/default/files/images/myimage.jpg'.
 *
 * @return
 *   A full path and filename with derivative image label inserted if required.
 */
function _image_filename($filepath, $label = IMAGE_ORIGINAL, $temp = FALSE) {
  // Get default path for a new file.
  $path = file_directory_path() . '/' . variable_get('image_default_path', 'images');
  if ($temp) {
    $path .= '/temp';
  }

  $original_path = dirname($filepath);
  $filename = basename($filepath);

  if ($label && ($label != IMAGE_ORIGINAL)) {
    // Keep resized images in the same path, where original is (does not
    // apply to temporary files, these still use the default path).
    if (!$temp && $original_path != '.') {
      $path = $original_path;
    }
    // Insert the resized name in non-original images.
    $pos = strrpos($filename, '.');
    if ($pos === FALSE) {
      // The file had no extension - which happens in really old image.module
      // versions, so figure out the extension.
      $image_info = image_get_info(file_create_path($path . '/' . $filename));
      $filename = $filename . '.' . $label . '.' . $image_info['extension'];
    }
    else {
      $filename = substr($filename, 0, $pos) . '.' . $label . substr($filename, $pos);
    }
  }

  return file_create_path($path . '/' . $filename);
}

/**
 * Helper function to return the defined sizes (or proper defaults).
 *
 * @param $size
 *   An optional string to return only the image size with the specified key.
 * @param $aspect_ratio
 *   Float value with the ratio of image height / width. If a size has only one
 *   dimension provided this will be used to compute the other.
 *
 * @return
 *   An associative array with width, height, and label fields for the size.
 *   If a $size parameter was specified and it cannot be found FALSE will be
 *   returned.
 */
function image_get_sizes($size = NULL, $aspect_ratio = NULL) {
  $defaults = array(
    IMAGE_ORIGINAL => array('width' => '', 'height' => '', 'label' => t('Original'), 'operation' => 'scale', 'link' => IMAGE_LINK_SHOWN),
    IMAGE_THUMBNAIL => array('width' => 100, 'height' => 100, 'label' => t('Thumbnail'), 'operation' => 'scale', 'link' => IMAGE_LINK_SHOWN),
    IMAGE_PREVIEW => array('width' => 640, 'height' => 640, 'label' => t('Preview'), 'operation' => 'scale', 'link' => IMAGE_LINK_SHOWN),
  );

  $sizes = array();
  foreach (variable_get('image_sizes', $defaults) as $key => $val) {
    // Only return sizes with a label.
    if (!empty($val['label'])) {
      // For a size with only one dimension specified, compute the other
      // dimension based on an aspect ratio.
      if ($aspect_ratio && (empty($val['width']) || empty($val['height']))) {
        if (empty($val['height']) && !empty($val['width'])) {
          $val['height'] = (int)round($val['width'] * $aspect_ratio);
        }
        elseif (empty($val['width']) && !empty($val['height'])) {
          $val['width'] = (int)round($val['height'] / $aspect_ratio);
        }
      }
      $sizes[$key] = $val;
    }
  }

  // If they requested a specific size return only that.
  if (isset($size)) {
    // Only return an array if it's available.
    return isset($sizes[$size]) ? $sizes[$size] : FALSE;
  }

  return $sizes;
}

/**
 * Helper function to preserve backwards compatibility. This has been
 * deprecated in favor of image_get_sizes().
 *
 * @TODO: Remove this in a future version.
 */
function _image_get_sizes($size = NULL, $aspect_ratio = NULL) {
  return image_get_sizes($size, $aspect_ratio);
}

/**
 * Is a given size a built-in, required size?
 *
 * @param $size
 *   One of the keys in the array returned by image_get_sizes().
 *
 * @return boolean
 */
function _image_is_required_size($size) {
  return in_array($size, array(IMAGE_THUMBNAIL, IMAGE_PREVIEW, IMAGE_ORIGINAL));
}