<?php

/**
 * @file
 * ImageCache functions.
 */

/**
 * Create ImageCache profiles for common display resolutions.
 */
function imagecache_auto_create_presets() {
  $presets = imagecache_auto_presets();
  foreach ($presets as $options) {
    imagecache_auto_create_preset($options);
  }
}

/**
 * Create an ImageCache preset.
 *
 * @param $options
 *   Preset options.
 *
 * @see http://drupal.org/node/558664
 */
function imagecache_auto_create_preset($options) {
  // Set preset name
  if (isset($options['name'])) {
    $name = $options['name'];
  }
  else {
    $name = $options['width'] .'x'. $options['height'];
  }

  // Check if preset already exists.
  $preset = imagecache_preset_by_name($name);
  if (!empty($preset)) {
    return;
  }

  // Check if maximum number of presets was reached.
  $max_presets = (int) variable_get('imagecache_auto_max_presets', '250');
  if (imagecache_auto_count_presets() + 1 > $max_presets) {
    $message = 'Maximum number of imagecache presets reached. Please consider increasing the max number of presets.';
    watchdog('imagecache_auto', $message, array(), WATCHDOG_ERROR);
    return;
  }

  // Create a preset.
  $preset = imagecache_preset_save(array('presetname' => $name));

  // Set operation name.
  if (isset($options['action'])) {
    $operation = $options['action'];
  }
  else {
    $operation = 'imagecache_scale_and_crop';
  }

  // Add preset actions.
  $action           = new stdClass();
  $action->presetid = $preset['presetid'];
  $action->module   = 'imagecache';
  $action->action   = $operation;
  $action->data     = array('width' => $options['width'], 'height' => $options['height']);
  drupal_write_record('imagecache_action', $action);
}

/**
 * Delete an ImageCache preset.
 *
 * @param $options
 *   Preset options.
 */
function imagecache_auto_delete_preset($options) {
  // Set preset name.
  if (isset($options['name'])) {
    $name = $options['name'];
  }
  else {
    $name = $options['width'] .'x'. $options['height'];
  }    

  // Check if preset exists.
  $preset = imagecache_preset_by_name($name);
  if (!empty($preset)) {
    imagecache_preset_delete(imagecache_preset_by_name($name));
  }
}

/**
 * Update imagecache presets.
 *
 * @param $old
 *   Old presets to be deleted.
 *
 * @param $new
 *   New presets to be created.
 */
function imagecache_auto_presets_update($old = array(), $new = NULL) {
  // Remove old presets.
  foreach ($old as $options) {
    imagecache_auto_delete_preset($options);
  }

  if ($new == NULL) {
    imagecache_auto_create_presets();
  }
  else {
    // Create new presets.
    foreach ($new as $options) {
      imagecache_auto_create_preset($options);
    }
  }
}

/**
 * Return an array of presets.
 *
 * @see http://en.wikipedia.org/wiki/List_of_common_resolutions
 */
function imagecache_auto_presets() {
  $presets = array();
  foreach (module_implements('imagecache_auto_presets') as $module) {
    $presets = array_merge($presets, module_invoke($module, 'imagecache_auto_presets'));
  }

  return $presets;
}

/**
 * Count number of existing imagecache presets.
 *
 * @return
 *   Number of existing presets.
 */
function imagecache_auto_count_presets() {
  $query  = 'SELECT COUNT(presetid) AS count FROM {imagecache_preset}';
  $result = db_query($query);
  $count  = db_fetch_object($result);
  return $count->count;
}