<?php
/**
 * @file
 * The admin/confirmation form to delete/purge a datastream.
 */
/**
 * The admin delete datastream form.
 *
 * @param array $form
 *   The Drupal form.
 * @param array $form_state
 *   The Drupal form state.
 * @param AbstractDatastream $datastream
 *   The datastream to be deleted.
 *
 * @return array
 *   The drupal form definition.
 */
function islandora_delete_datastream_form(array $form, array &$form_state, AbstractDatastream $datastream) {
  $form_state['datastream'] = $datastream;
  $form['delete_derivatives'] = array(
    '#title' => t('Delete derivatives?'),
    '#type' => 'checkbox',
    '#default_value' => 0,
  );
  return confirm_form($form,
    t('Are you sure you want to delete the %dsid datastream?', array('%dsid' => $datastream->id)),
    "islandora/object/{$datastream->parent->id}",
    t('This action cannot be undone.'),
    t('Delete'),
    t('Cancel')
  );
}
/**
 * Purges datastream derivatives if selected.
 *
 * Implements hook_islandora_datastream_purged().
 */
function islandora_datastream_derivatives_purged(AbstractObject $object, $dsid) {
   $models = array(
    'ir:citationCModel',
    'ir:thesisCModel',
  );
  module_load_include('inc', 'islandora', 'includes/utilities');
  $hooks = islandora_invoke_hook_list(ISLANDORA_DERVIATIVE_CREATION_HOOK, $object->models, array($object));
  $dsid_map = function ($hook_definition) {
    return $hook_definition['destination_dsid'];
  };
  $dsids = array_map($dsid_map, $hooks);
  array_map(array($object, 'purgeDatastream'), $dsids);
}
/** Submit handler for the delete datastream form.
 *
 * Purges/Delete's the given AbstractDatastream if possible.
 *
 * The ISLANDORA_PRE_PURGE_DATASTREAM_HOOK will query other modules as to
 * whether the given FedoraDatastream
 * should be: blocked from purging; state set to 'Deleted'; or purged.
 *
 * @param array $form
 *   The Drupal form.
 * @param array $form_state
 *   The Drupal form state.
 */
function islandora_delete_datastream_form_submit(array $form, array &$form_state) {
  $datastream = $form_state['datastream'];
  $datastream_id = $datastream->id;
  $object = $datastream->parent;
  $deleted = FALSE;
  
  if(!empty($form_state['values']['delete_derivatives'])){
    islandora_datastream_derivatives_purged($object, $datastream_id);
  } 
  try {
    $deleted = islandora_delete_datastream($datastream);
  }
  catch (Exception $e) {
    drupal_set_message(t('Error deleting %s datastream from object %o %e', array(
          '%s' => $datastream_id,
          '%o' => $object->label,
          '%e' => $e->getMessage())), 'error');
  }
  if ($deleted) {
    drupal_set_message(t('%d datastream sucessfully deleted from Islandora object %o', array(
          '%d' => $datastream_id,
          '%o' => $object->label)));
  }
  else {
    drupal_set_message(t('Error deleting %s datastream from object %o', array(
          '%s' => $datastream_id,
          '%o' => $object->label)), 'error');
  }
  $form_state['redirect'] = "islandora/object/{$object->id}";
}