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<?php

/**
 * @file
 */

/**
 *
 */
function views_natural_sort_text_field_views_api() {
  return array(
    'api' => 3.0,
  );
}

/**
 *
 */
function views_natural_sort_text_field_module_implements_alter(&$implementations, $hook) {
  if ($hook == 'form_alter' && isset($implementations['views_natural_sort_text_field'])) {
    unset($implementations['views_natural_sort_text_field']);
    $implementations['views_natural_sort_text_field'] = FALSE;
  }
}

/**
 *
 */
function views_natural_sort_text_field_form_field_ui_field_edit_form_alter(&$form, &$form_state, $form_id) {
  $potential_fields = views_natrual_sort_text_get_potential_fields();
  if (!isset($potential_fields[$form['#field']['id']])) {
    return;
  }
  // TODO: Inform the user that this field is being used in views.
  $form['field']['views_natural_sort_enable_sort'] = array(
    '#type' => 'checkbox',
    '#title' => t('Enable natural sorting.'),
    '#description' => t('Selecting this option will process and index this field\'s value for natural sorting in views.'),
    '#default_value' => empty($form['#field']['views_natural_sort_enable_sort']) ? 0 : $form['#field']['views_natural_sort_enable_sort'],
  );
  $form['#submit'][] = 'views_natural_sort_text_field_form_field_ui_field_edit_form_alter_submit';
}

/**
 *
 */
function views_natural_sort_text_field_form_field_ui_field_edit_form_alter_submit($form, $form_state) {
  // Rebuild index for this field.
  if ($form_state['input']['field']['views_natural_sort_enable_sort'] != 1) {
    // TODO: Revert views back to regular sort ASC & DESC.
    db_delete('views_natural_sort')
      ->condition('field', $form['#field']['field_name'])
      ->execute();
  }
  else {
    module_load_include('inc', 'views_natural_sort', 'views_natural_sort.admin');
    views_natural_sort_rebuild_index_batch_set(views_natural_sort_text_field_views_natural_sort_get_entry_types(array($form['#field'])));
  }
}

/**
 *
 */
function views_natural_sort_text_field_views_natural_sort_get_entry_types($fields = array()) {
  if (empty($fields)) {
    $fields = views_natural_sort_text_field_get_configured_fields();
  }
  $entry_types = array();
  foreach ($fields as $field) {
    $entry_types = array_merge($entry_types, views_natural_sort_text_field_get_entry_types_from_field($field));
  }
  return $entry_types;
}

/**
 *
 */
function views_natural_sort_text_field_get_entry_types_from_field($field) {
  $entry_types = array();
  foreach ($field['bundles'] as $entity_type => $bundles) {
    $entry_types[] = array(
      'entity_type' => $entity_type,
      'field' => $field['field_name'],
    );
  }
  return $entry_types;
}

/**
 *
 */
function views_natural_sort_text_field_views_natural_sort_queue_rebuild_data($entry_type) {
  if (!in_array($entry_type, views_natural_sort_text_field_views_natural_sort_get_entry_types())) {
    return array();
  }
  $queue = views_natural_sort_get_queue();
  $field = field_info_field($entry_type['field']);
  $data = array();
  $bundles = array();

  if (isset($field['bundles'][$entry_type['entity_type']])) {
    foreach ($field['bundles'][$entry_type['entity_type']] as $key => $bundle) {
      $bundles[] = $bundle;
    }
  }

  $query = new EntityFieldQuery();
  $result = $query->entityCondition('entity_type', $entry_type['entity_type'])
    ->entityCondition('bundle', $bundles, 'IN')
    ->execute();
  $entity_ids = array();

  if (isset($result[$entry_type['entity_type']])) {
    $entity_ids = array_keys($result[$entry_type['entity_type']]);
  }

  foreach ($entity_ids as $entity_id) {
    $results = entity_load($entry_type['entity_type'], array($entity_id));
    $entity = reset($results);
    $entries = _views_natural_sort_text_field_to_vns($entry_type['entity_type'], $entity, $field);
    foreach ($entries as $entry) {
      $queue->createItem($entry);
    }
  }
}

/**
 *
 */
function views_natural_sort_text_field_field_attach_insert($entity_type, $entity) {
  $configured_fields = views_natural_sort_text_field_get_configured_fields();
  foreach ($configured_fields as $field) {
    if (in_array($entity_type, array_keys($field['bundles']))) {
      _views_natural_sort_text_field_store($entity_type, $entity, $field);
    }
  }
}

/**
 *
 */
function views_natural_sort_text_field_field_attach_update($entity_type, $entity) {
  $configured_fields = views_natural_sort_text_field_get_configured_fields();
  foreach ($configured_fields as $field) {
    if (in_array($entity_type, array_keys($field['bundles']))) {
      _views_natural_sort_text_field_store($entity_type, $entity, $field);
    }
  }
}

/**
 *
 */
function views_natural_sort_text_field_get_configured_fields() {
  $potential_fields = views_natrual_sort_text_get_potential_fields();
  $returned_fields = array();
  foreach ($potential_fields as $field) {
    if (!empty($field['views_natural_sort_enable_sort'])) {
      $returned_fields[$field['id']] = $field;
    }
  }
  return $returned_fields;
}

/**
 *
 */
function views_natrual_sort_text_get_potential_fields() {
  $all_fields = field_info_fields();
  $returned_fields = array();
  foreach ($all_fields as $field_name => $field) {
    if ($field['module'] == 'text' &&
      $field['storage']['type'] == 'field_sql_storage' &&
      $field['columns']['value']['type'] == 'varchar') {
      $returned_fields[$field['id']] = $field;
    }
  }
  return $returned_fields;
}

/**
 *
 */
function _views_natural_sort_text_field_store($entity_type, $entity, $field) {
  views_natural_sort_store_multiple(_views_natural_sort_text_field_to_vns($entity_type, $entity, $field));
}

/**
 *
 */
function _views_natural_sort_text_field_to_vns($entity_type, $entity, $field) {
  $entity_info = entity_get_info($entity_type);
  $entity_id_property = $entity_info['entity keys']['id'];
  $field_name = $field['field_name'];

  // TODO: add support for Field Language.
  $entries = array();
  $field_items = field_get_items($entity_type, $entity, $field_name);
  if (!empty($field_items)) {
    foreach ($field_items as $delta => $row) {
      $entries[] = array(
        'eid' => $entity->$entity_id_property,
        'entity_type' => $entity_type,
        'field' => $field_name,
        'delta' => $delta,
        'content' => $row['value'],
      );
    }
  }
  return $entries;
}