<?php

/**
 * @file
 * Defines the core Commerce product entity, including the entity itself, the
 * bundle definitions (product types), and various API functions to manage
 * products and interact with them through forms and autocompletes.
 */

/**
 * Implements hook_menu().
 */
function commerce_product_menu() {
  $items = array();

  $items['commerce_product/autocomplete'] = array(
    'title' => 'commerce_product autocomplete',
    'page callback' => 'commerce_product_autocomplete',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );

  return $items;
}

/**
 * Implements hook_hook_info().
 */
function commerce_product_hook_info() {
  $hooks = array(
    'commerce_product_type_info' => array(
      'group' => 'commerce',
    ),
    'commerce_product_type_info_alter' => array(
      'group' => 'commerce',
    ),
    'commerce_product_type_insert' => array(
      'group' => 'commerce',
    ),
    'commerce_product_type_update' => array(
      'group' => 'commerce',
    ),
    'commerce_product_type_delete' => array(
      'group' => 'commerce',
    ),
    'commerce_product_uri' => array(
      'group' => 'commerce',
    ),
    'commerce_product_view' => array(
      'group' => 'commerce',
    ),
    'commerce_product_presave' => array(
      'group' => 'commerce',
    ),
    'commerce_product_insert' => array(
      'group' => 'commerce',
    ),
    'commerce_product_update' => array(
      'group' => 'commerce',
    ),
    'commerce_product_can_delete' => array(
      'group' => 'commerce',
    ),
    'commerce_product_delete' => array(
      'group' => 'commerce',
    ),
  );

  return $hooks;
}

/**
 * Implements hook_entity_info().
 */
function commerce_product_entity_info() {
  $return = array(
    'commerce_product' => array(
      'label' => t('Commerce Product'),
      'controller class' => 'CommerceProductEntityController',
      'base table' => 'commerce_product',
      'revision table' => 'commerce_product_revision',
      'fieldable' => TRUE,
      'entity keys' => array(
        'id' => 'product_id',
        'bundle' => 'type',
        'label' => 'title',
        'revision' => 'revision_id',
        'language' => 'language',
      ),
      'bundle keys' => array(
        'bundle' => 'type',
      ),
      'bundles' => array(),
      'load hook' => 'commerce_product_load',
      'view modes' => array(
        'full' => array(
          'label' => t('Admin display'),
          'custom settings' => FALSE,
        ),
      ),
      'uri callback' => 'commerce_product_uri',
      'metadata controller class' => '',
      'token type' => 'commerce-product',
      'access callback' => 'commerce_entity_access',
      'access arguments' => array(
        'user key' => 'uid',
        'access tag' => 'commerce_product_access',
      ),
      'permission labels' => array(
        'singular' => t('product'),
        'plural' => t('products'),
      ),

      // Prevent Redirect alteration of the product form.
      'redirect' => FALSE,

      // Add translation support.
      'translation' => array(
        'locale' => TRUE,
        'entity_translation' => array(
          'class' => 'EntityTranslationCommerceProductHandler',
          'bundle callback' => 'commerce_product_entity_translation_supported_type',
          'default settings' => array(
            'default_language' => LANGUAGE_NONE,
            'hide_language_selector' => FALSE,
          ),
        ),
      ),

      // Add title replacement support for translations.
      'field replacement' => array(
        'title' => array(
          'field' => array(
            'type' => 'text',
            'cardinality' => 1,
            'translatable' => TRUE,
          ),
          'instance' => array(
            'label' => t('Title'),
            'required' => TRUE,
            'settings' => array(
              'text_processing' => 0,
            ),
            'widget' => array(
              'weight' => -5,
            ),
          ),
        ),
      ),
    ),
  );

  foreach (commerce_product_type_get_name() as $type => $name) {
    $return['commerce_product']['bundles'][$type] = array(
      'label' => $name,
    );
  }

  return $return;
}

/**
 * Entity uri callback: gives modules a chance to specify a path for a product.
 */
function commerce_product_uri($product) {
  // Allow modules to specify a path, returning the first one found.
  foreach (module_implements('commerce_product_uri') as $module) {
    $uri = module_invoke($module, 'commerce_product_uri', $product);

    // If the implementation returned data, use that now.
    if (!empty($uri)) {
      return $uri;
    }
  }

  return NULL;
}

/**
 * Implements hook_file_download_access().
 *
 * This hook is grants access to files based on a user's access to the entity
 * a file is attached to. For example, users with access to a product should be
 * allowed to download files attached to that product. Here we do this on a per-
 * field basis for files attached to products.
 *
 * @param $field
 *   The field to which the file belongs.
 * @param $entity_type
 *   The type of $entity; for example, 'node' or 'user' or 'commerce_product'.
 * @param $entity
 *   The $entity to which $file is referenced.
 *
 * @return
 *   TRUE if access should be allowed by this entity or FALSE if denied. Note
 *   that denial may be overridden by another entity controller, making this
 *   grant permissive rather than restrictive.
 */
function commerce_product_file_download_access($field, $entity_type, $entity) {
  if ($entity_type == 'commerce_product') {
    return field_access('view', $field, $entity_type, $entity);
  }
}

/**
 * Implements hook_field_extra_fields().
 */
function commerce_product_field_extra_fields() {
  $extra = array();

  foreach (commerce_product_types() as $type => $product_type) {
    $extra['commerce_product'][$type] = array(
      'form' => array(
        'sku' => array(
          'label' => t('Product SKU'),
          'description' => t('Product module SKU form element'),
          'weight' => -10,
        ),
        'title' => array(
          'label' => t('Title'),
          'description' => t('Product module title form element'),
          'weight' => -5,
        ),
        'status' => array(
          'label' => t('Status'),
          'description' => t('Product module status form element'),
          'weight' => 35,
        ),
      ),
      'display' => array(
        'sku' => array(
          'label' => t('SKU'),
          'description' => t('The human readable identifier of the product'),
          'theme' => 'commerce_product_sku',
          'weight' => -10,
        ),
        'title' => array(
          'label' => t('Title'),
          'description' => t('Full product title'),
          'theme' => 'commerce_product_title',
          'weight' => -5,
        ),
        'status' => array(
          'label' => t('Status'),
          'description' => t('Whether the product is active or disabled'),
          'theme' => 'commerce_product_status',
          'weight' => 5,
        ),
      ),
    );
  }

  return $extra;
}

/**
 * Implements hook_theme().
 */
function commerce_product_theme() {
  return array(
    'commerce_product_sku' => array(
      'variables' => array('sku' => NULL, 'label' => NULL, 'product' => NULL),
      'path' => drupal_get_path('module', 'commerce_product') . '/theme',
      'template' => 'commerce-product-sku',
    ),
    'commerce_product_title' => array(
      'variables' => array('title' => NULL, 'label' => NULL, 'product' => NULL),
      'path' => drupal_get_path('module', 'commerce_product') . '/theme',
      'template' => 'commerce-product-title',
    ),
    'commerce_product_status' => array(
      'variables' => array('status' => NULL, 'label' => NULL, 'product' => NULL),
      'path' => drupal_get_path('module', 'commerce_product') . '/theme',
      'template' => 'commerce-product-status',
    ),
  );
}

/**
 * Implements hook_views_api().
 */
function commerce_product_views_api() {
  return array(
    'api' => 3,
    'path' => drupal_get_path('module', 'commerce_product') . '/includes/views',
  );
}

/**
 * Implements hook_permission().
 */
function commerce_product_permission() {
  $permissions = array(
    'administer product types' => array(
      'title' => t('Administer product types'),
      'description' => t('Allows users to configure product types and their fields.'),
      'restrict access' => TRUE,
    ),
  );

  $permissions += commerce_entity_access_permissions('commerce_product');

  return $permissions;
}

/**
 * Implements hook_enable().
 */
function commerce_product_enable() {
  commerce_product_configure_product_types();
}

/**
 * Implements hook_modules_enabled().
 */
function commerce_product_modules_enabled($modules) {
  commerce_product_configure_product_fields($modules);
}

/**
 * Configure the product types defined by enabled modules.
 */
function commerce_product_configure_product_types() {
  foreach (commerce_product_types() as $type => $product_type) {
    commerce_product_configure_product_type($type);
  }
}

/**
 * Ensures a base price field is present on a product type bundle.
 */
function commerce_product_configure_product_type($type) {
  commerce_price_create_instance('commerce_price', 'commerce_product', $type, t('Price'), 0, 'calculated_sell_price');
}

/**
 * Configures the fields on product types provided by other modules.
 *
 * @param $modules
 *   An array of module names whose product type fields should be configured;
 *   if left NULL, will default to all modules that implement
 *   hook_commerce_product_type_info().
 */
function commerce_product_configure_product_fields($modules = NULL) {
  // If no modules array is passed, recheck the fields for all product types
  // defined by enabled modules.
  if (empty($modules)) {
    $modules = module_implements('commerce_product_type_info');
  }

  // Reset the product type cache to get types added by newly enabled modules.
  commerce_product_types_reset();

  // Loop through all the enabled modules.
  foreach ($modules as $module) {
    // If the module implements hook_commerce_product_type_info()...
    if (module_hook($module, 'commerce_product_type_info')) {
      $product_types = module_invoke($module, 'commerce_product_type_info');

      // Loop through and configure the product types defined by the module.
      foreach ($product_types as $type => $product_type) {
        commerce_product_configure_product_type($type);
      }
    }
  }
}

/**
 * Returns an array of product type arrays keyed by type.
 */
function commerce_product_types() {
  // First check the static cache for a product types array.
  $product_types = &drupal_static(__FUNCTION__);

  // If it did not exist, fetch the types now.
  if (!isset($product_types)) {
    $product_types = array();

    // Find product types defined by hook_commerce_product_type_info().
    foreach (module_implements('commerce_product_type_info') as $module) {
      foreach (module_invoke($module, 'commerce_product_type_info') as $type => $product_type) {
        // Set the module each product type is defined by and revision handling
        // if they aren't set yet.
        $product_type += array(
          'module' => $module,
          'revision' => 1,
        );
        $product_types[$type] = $product_type;
      }
    }

    // Last allow the info to be altered by other modules.
    drupal_alter('commerce_product_type_info', $product_types);
  }

  return $product_types;
}

/**
 * Resets the cached list of product types.
 */
function commerce_product_types_reset() {
  $product_types = &drupal_static('commerce_product_types');
  $product_types = NULL;
  entity_info_cache_clear();
}

/**
 * Loads a product type.
 *
 * @param $type
 *   The machine-readable name of the product type; accepts normal machine names
 *     and URL prepared machine names with underscores replaced by hyphens.
 */
function commerce_product_type_load($type) {
  $type = strtr($type, array('-' => '_'));
  $product_types = commerce_product_types();
  return !empty($product_types[$type]) ? $product_types[$type] : FALSE;
}

/**
 * Returns the human readable name of any or all product types.
 *
 * @param $type
 *   Optional parameter specifying the type whose name to return.
 *
 * @return
 *   Either an array of all product type names keyed by the machine name or a
 *     string containing the human readable name for the specified type. If a
 *     type is specified that does not exist, this function returns FALSE.
 */
function commerce_product_type_get_name($type = NULL) {
  $product_types = commerce_product_types();

  // Return a type name if specified and it exists.
  if (!empty($type)) {
    if (isset($product_types[$type])) {
      return $product_types[$type]['name'];
    }
    else {
      // Return FALSE if it does not exist.
      return FALSE;
    }
  }

  // Otherwise turn the array values into the type name only.
  foreach ($product_types as $key => $value) {
    $product_types[$key] = $value['name'];
  }

  return $product_types;
}

/**
 * Wraps commerce_product_type_get_name() for the Entity module.
 */
function commerce_product_type_options_list() {
  return commerce_product_type_get_name();
}

/**
 * Returns a path argument from a product type.
 */
function commerce_product_type_to_arg($type) {
  return strtr($type, '_', '-');
}

/**
 * Returns an initialized product object.
 *
 * @param $type
 *   The machine-readable type of the product.
 *
 * @return
 *   A product object with all default fields initialized.
 */
function commerce_product_new($type = '') {
  return entity_get_controller('commerce_product')->create(array('type' => $type));
}

/**
 * Saves a product.
 *
 * @param $product
 *   The full product object to save.
 *
 * @return
 *   SAVED_NEW or SAVED_UPDATED depending on the operation performed.
 */
function commerce_product_save($product) {
  return entity_get_controller('commerce_product')->save($product);
}

/**
 * Loads a product by ID.
 */
function commerce_product_load($product_id) {
  if (empty($product_id)) {
    return FALSE;
  }

  $products = commerce_product_load_multiple(array($product_id), array());
  return $products ? reset($products) : FALSE;
}

/**
 * Loads a product by SKU.
 */
function commerce_product_load_by_sku($sku) {
  $products = commerce_product_load_multiple(array(), array('sku' => $sku));
  return $products ? reset($products) : FALSE;
}

/**
 * Loads multiple products by ID or based on a set of matching conditions.
 *
 * @see entity_load()
 *
 * @param $product_ids
 *   An array of product IDs.
 * @param $conditions
 *   An array of conditions on the {commerce_product} table in the form
 *     'field' => $value.
 * @param $reset
 *   Whether to reset the internal product loading cache.
 *
 * @return
 *   An array of product objects indexed by product_id.
 */
function commerce_product_load_multiple($product_ids = array(), $conditions = array(), $reset = FALSE) {
  if (empty($product_ids) && empty($conditions)) {
    return array();
  }

  return entity_load('commerce_product', $product_ids, $conditions, $reset);
}

/**
 * Determines whether or not the give product can be deleted.
 *
 * @param $product
 *   The product to be checked for deletion.
 *
 * @return
 *   Boolean indicating whether or not the product can be deleted.
 */
function commerce_product_can_delete($product) {
  // Return FALSE if the given product does not have an ID; it need not be
  // deleted, which is functionally equivalent to cannot be deleted as far as
  // code depending on this function is concerned.
  if (empty($product->product_id)) {
    return FALSE;
  }

  // If any module implementing hook_commerce_product_can_delete() returns FALSE
  // the product cannot be deleted. Return TRUE if none return FALSE.
  return !in_array(FALSE, module_invoke_all('commerce_product_can_delete', $product));
}

/**
 * Deletes a product by ID.
 *
 * @param $product_id
 *   The ID of the product to delete.
 *
 * @return
 *   TRUE on success, FALSE otherwise.
 */
function commerce_product_delete($product_id) {
  return commerce_product_delete_multiple(array($product_id));
}

/**
 * Deletes multiple products by ID.
 *
 * @param $product_ids
 *   An array of product IDs to delete.
 *
 * @return
 *   TRUE on success, FALSE otherwise.
 */
function commerce_product_delete_multiple($product_ids) {
  return entity_get_controller('commerce_product')->delete($product_ids);
}

/**
 * Checks product access for various operations.
 *
 * @param $op
 *   The operation being performed. One of 'view', 'update', 'create' or
 *   'delete'.
 * @param $product
 *   Optionally a product to check access for or for the create operation the
 *   product type. If nothing is given access permissions for all products are returned.
 * @param $account
 *   The user to check for. Leave it to NULL to check for the current user.
 */
function commerce_product_access($op, $product = NULL, $account = NULL) {
  return commerce_entity_access($op, $product, $account, 'commerce_product');
}

/**
 * Implements hook_query_TAG_alter().
 */
function commerce_product_query_commerce_product_access_alter(QueryAlterableInterface $query) {
  return commerce_entity_access_query_alter($query, 'commerce_product');
}

/**
 * Performs token replacement on a SKU for valid tokens only.
 *
 * TODO: This function currently limits acceptable Tokens to Product ID and type
 * with no ability to use Tokens for the Fields attached to the product. That
 * might be fine for a core Token replacement, but we should at least open the
 * $valid_tokens array up to other modules to enable various Tokens for use.
 *
 * @param $sku
 *   The raw SKU string including any tokens as entered.
 * @param $product
 *   A product object used to perform token replacement on the SKU.
 *
 * @return
 *   The SKU with tokens replaced or else FALSE if it included invalid tokens.
 */
function commerce_product_replace_sku_tokens($sku, $product) {
  // Build an array of valid SKU tokens.
  $valid_tokens = array('product-id', 'type');

  // Ensure that only valid tokens were used.
  $invalid_tokens = FALSE;

  foreach (token_scan($sku) as $type => $token) {
    if ($type !== 'product') {
      $invalid_tokens = TRUE;
    }
    else {
      foreach (array_keys($token) as $value) {
        if (!in_array($value, $valid_tokens)) {
          $invalid_tokens = TRUE;
        }
      }
    }
  }

  // Register the error if an invalid token was detected.
  if ($invalid_tokens) {
    return FALSE;
  }

  return $sku;
}

/**
 * Checks to see if a given SKU already exists for another product.
 *
 * @param $sku
 *   The string to match against existing SKUs.
 * @param $product_id
 *   The ID of the product the SKU is for; an empty value represents the SKU is
 *     meant for a new product.
 *
 * @return
 *   TRUE or FALSE indicating whether or not the SKU exists for another product.
 */
function commerce_product_validate_sku_unique($sku, $product_id) {
  // Look for an ID of a product matching the supplied SKU.
  if ($match_id = db_query('SELECT product_id FROM {commerce_product} WHERE sku = :sku', array(':sku' => $sku))->fetchField()) {
    // If this SKU is supposed to be for a new product or a product other than
    // the one that matched...
    if (empty($product_id) || $match_id != $product_id) {
      return FALSE;
    }
  }

  return TRUE;
}

/**
 * Checks to ensure a given SKU does not contain invalid characters.
 *
 * @param $sku
 *   The string to validate as a SKU.
 *
 * @return
 *   TRUE or FALSE indicating whether or not the SKU is valid.
 */
function commerce_product_validate_sku($sku) {
  // Do not allow commas in a SKU.
  if (strpos($sku, ',')) {
    return FALSE;
  }

  return TRUE;
}

/**
 * Callback for getting product properties.
 * @see commerce_product_entity_property_info()
 */
function commerce_product_get_properties($product, array $options, $name) {
  switch ($name) {
    case 'creator':
      return $product->uid;
    case 'edit_url':
      return url('admin/commerce/products/' . $product->product_id . '/edit', $options);
  }
}

/**
 * Callback for setting product properties.
 * @see commerce_product_entity_property_info()
 */
function commerce_product_set_properties($product, $name, $value) {
  if ($name == 'creator') {
    $product->uid = $value;
  }
}

/**
 * Returns output for product autocompletes.
 *
 * The values returned will be keyed by SKU and appear as such in the textfield,
 * even though the preview in the autocomplete list shows "SKU: Title".
 */
function commerce_product_autocomplete($entity_type, $field_name, $bundle, $string = '') {
  $field = field_info_field($field_name);
  $instance = field_info_instance($entity_type, $field_name, $bundle);

  $matches = array();

  // Extract the SKU string from the URL while preserving support for SKUs that
  // contain slashes. Whereas we previously relied on the $string parameter, its
  // value was being truncated when any SKUs in the autocomplete widget had a /.
  // @see http://drupal.org/node/1962144
  $args = explode('/', request_path());

  if (count($args) <= 5) {
    drupal_json_output($matches);
    return;
  }

  // Trim off leading arguments from other modules such as Locale.
  $offset = array_search('commerce_product', $args);

  array_splice($args, 0, 5 + $offset);
  $string = implode('/', $args);

  // The user enters a comma-separated list of tags. We only autocomplete the last tag.
  $tags_typed = drupal_explode_tags($string);
  $tag_last = drupal_strtolower(array_pop($tags_typed));

  if (!empty($tag_last)) {
    $prefix = count($tags_typed) ? implode(', ', $tags_typed) . ', ' : '';

    // Determine the type of autocomplete match to use when searching for products.
    $match = isset($field['widget']['autocomplete_match']) ? $field['widget']['autocomplete_match'] : 'contains';

    // Get an array of matching products.
    $products = commerce_product_match_products($field, $instance, $tag_last, $match, array(), 10);

    // Loop through the products and convert them into autocomplete output.
    foreach ($products as $product_id => $data) {
      $matches[$prefix . $data['sku']] = $data['rendered'];
    }
  }

  drupal_json_output($matches);
}

/**
 * Fetches an array of all products matching the given parameters.
 *
 * This info is used in various places (allowed values, autocomplete results,
 * input validation...). Some of them only need the product_ids, others
 * product_id + titles, others yet product_id + titles + rendered row (for
 * display in widgets).
 *
 * The array we return contains all the potentially needed information,
 * and lets calling functions use the parts they actually need.
 *
 * @param $field
 *   The field description.
 * @param $string
 *   Optional string to filter SKUs and titles on (used by autocomplete).
 * @param $match
 *   Operator to match filtered SKUs and titles against, can be any of:
 *   'contains', 'equals', 'starts_with'
 * @param $ids
 *   Optional product ids to lookup (used when $string and $match arguments are
 *   not given).
 * @param $limit
 *   If non-zero, limit the size of the result set.
 * @param $access_tag
 *   Boolean indicating whether or not an access control tag should be added to
 *   the query to find matching product data. Defaults to FALSE.
 *
 * @return
 *   An array of valid products in the form:
 *   array(
 *     product_id => array(
 *       'product_sku' => The product SKU,
 *       'title' => The product title,
 *       'rendered' => The text to display in widgets (can be HTML)
 *     ),
 *     ...
 *   )
 */
function commerce_product_match_products($field, $instance = NULL, $string = '', $match = 'contains', $ids = array(), $limit = NULL, $access_tag = FALSE) {
  $results = &drupal_static(__FUNCTION__, array());

  // Create unique id for static cache.
  $cid = implode(':', array(
    $field['field_name'],
    $match,
    ($string !== '' ? $string : implode('-', $ids)),
    $limit,
  ));

  if (!isset($results[$cid])) {
    $matches = _commerce_product_match_products_standard($instance, $string, $match, $ids, $limit, $access_tag);

    // Store the results.
    $results[$cid] = !empty($matches) ? $matches : array();
  }

  return $results[$cid];
}

/**
 * Helper function for commerce_product_match_products().
 *
 * Returns an array of products matching the specific parameters.
 */
function _commerce_product_match_products_standard($instance, $string = '', $match = 'contains', $ids = array(), $limit = NULL, $access_tag = FALSE) {
  // Build the query object with the necessary fields.
  $query = db_select('commerce_product', 'cp');

  // Add the access control tag if specified.
  if ($access_tag) {
    $query->addTag('commerce_product_access');
  }

  // Add a global query tag so anyone can alter this query.
  $query->addTag('commerce_product_match');

  $product_id_alias = $query->addField('cp', 'product_id');
  $product_sku_alias = $query->addField('cp', 'sku');
  $product_title_alias = $query->addField('cp', 'title');
  $product_type_alias = $query->addField('cp', 'type');

  // Add a condition to the query to filter by matching product types.
  if (!empty($instance['settings']['referenceable_types'])) {
    $types = array_diff(array_values($instance['settings']['referenceable_types']), array(0, NULL));

    // Only filter by type if some types have been specified.
    if (!empty($types)) {
      $query->condition('cp.type', $types, 'IN');
    }
  }

  if ($string !== '') {
    $args = array();

    // Build a where clause matching on either the SKU or title.
    switch ($match) {
      case 'contains':
        $where = '(cp.sku LIKE :sku_match OR cp.title LIKE :title_match)';
        $args['sku_match'] = '%' . $string . '%';
        $args['title_match'] = '%' . $string . '%';
        break;

      case 'starts_with':
        $where = '(cp.sku LIKE :sku_match OR cp.title LIKE :title_match)';
        $args['sku_match'] = $string . '%';
        $args['title_match'] = $string . '%';
        break;

      case 'equals':
      default:
        $where = '(cp.sku = :sku_match OR cp.title = :title_match)';
        $args['sku_match'] = $string;
        $args['title_match'] = $string;
        break;
    }

    $query->where($where, $args);
  }
  elseif ($ids) {
    // Otherwise add a product_id specific condition if specified.
    $query->condition($product_id_alias, $ids, 'IN', $ids);
  }

  // Order the results by SKU, title, and then product type.
  $query
    ->orderBy($product_sku_alias)
    ->orderBy($product_title_alias)
    ->orderBy($product_type_alias);

  // Add a limit if specified.
  if ($limit) {
    $query->range(0, $limit);
  }

  // Execute the query and build the results array.
  $result = $query->execute();

  $matches = array();

  foreach ($result->fetchAll() as $product) {
    $matches[$product->product_id] = array(
      'sku' => $product->sku,
      'type' => $product->type,
      'title' => $product->title,
      'rendered' => t('@sku: @title', array('@sku' => $product->sku, '@title' => $product->title)),
    );
  }

  return $matches;
}

/**
 * Access callback: determines access to a product's translation tab.
 */
function commerce_product_entity_translation_tab_access($product) {
  return entity_translation_tab_access('commerce_product', $product);
}

/**
 * Returns whether the given product type has support for translations.
 *
 * @param $type
 *   The machine-name of the product type to check for translation support.
 *
 * @return
 *   TRUE or FALSE indicating translation support for the requested type.
 */
function commerce_product_entity_translation_supported_type($type) {
  return variable_get('language_product_type_' . $type, 0) == ENTITY_TRANSLATION_ENABLED;
}

/**
 * Sanitizes the product SKU before output.
 */
function template_preprocess_commerce_product_sku(&$variables) {
  $variables['sku'] = check_plain($variables['sku']);
}

/**
 * Sanitizes the product title before output.
 */
function template_preprocess_commerce_product_title(&$variables) {
  $variables['title'] = check_plain($variables['title']);
}

/**
 * Returns the options list for the product status property.
 */
function commerce_product_status_options_list() {
  return array(
    0 => t('Disabled'),
    1 => t('Active'),
  );
}

/**
 * Converts the product status integer to a string before output.
 */
function template_preprocess_commerce_product_status(&$variables) {
  $variables['status'] = empty($variables['status']) ? t('Disabled') : t('Active');
}