<?php

/**
 * @fle
 * Module file for adding a tab to edit the node's product page.
 */

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

  $items['node/%node/edit-product'] = array(
    'title' => t('Edit Product'),
    'access callback' => 'commerce_edit_product_callback',
    'access arguments' => array(1),
    'type' => MENU_LOCAL_TASK,
    'context' => MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE,
  );

  return $items;
}

/**
 * Implements hook_menu_local_tasks_alter().
 *
 * Chaging the tab href and not call to other function and then use drupl_goto.
 */
function commerce_edit_product_menu_local_tasks_alter(&$data, $router_item, $root_path) {
  foreach ($data['tabs'][0]['output'] as $key => $item) {
    if ($item['#link']['path'] == "node/%/edit-product") {
      $wrapper = entity_metadata_wrapper('node', $router_item['page_arguments'][0]);
      $data['tabs'][0]['output'][$key]['#link']['href'] = 'admin/commerce/products/' . $wrapper->field_product->getIdentifier() . '/edit';
    }
  }
}

/**
 * Access callback.
 *
 *  @param $node
 *    The node object.
 *
 *  @return
 *    TRUE/FALSE if the user can edit the product.
 */
function commerce_edit_product_callback($node) {
  global $user;

  if (!$user->uid || ($node->uid != $user->uid)) {
    return;
  }

  $edit_commerce_product = user_access('edit any commerce_product entity of bundle product');
  $edit_any_commerce_product = user_access('edit own commerce_product entities of bundle product');

  return $edit_commerce_product | $edit_any_commerce_product;
}