<?php
/**
 * @file
 * Handles the main hooks used by entityconnect.
 *
 * One will find most of the meet in the form and menu includes.
 */

define('ENTITYCONNECT_CACHE_TABLE', 'cache_entityconnect');

/**
 * Includes.
 */
require_once 'includes/entityconnect.fields.inc';
require_once 'includes/entityconnect.utils.inc';

/**
 * Implements hook_permission().
 *
 * @return Assoc
 *   permission items
 */
function entityconnect_permission() {
  return array(
    'entityconnect add button' => array(
      'title' => t('Allows users to see add button'),
      'description' => t('Display the add button for user'),
    ),
    'entityconnect edit button' => array(
      'title' => t('Allows users to see edit button'),
      'description' => t('Display the edit button for user'),
    ),
  );
}

/**
 * Implements hook_menu().
 */
function entityconnect_menu() {
  $items = array();
  $items['admin/entityconnect/return/%'] = array(
    'description' => 'Return item for original entity.',
    'page callback' => 'entityconnect_return',
    'page arguments' => array(3),
    'access callback' => 'entityconnect_check_access',
    'file' => 'includes/entityconnect.menu.inc',
  );

  $items['admin/entityconnect/edit/%'] = array(
    'description' => 'Edit item for entity referenced.',
    'page callback' => 'entityconnect_edit',
    'page arguments' => array(3),
    'access callback' => 'user_access',
    'access arguments' => array('entityconnect edit button'),
    'file' => 'includes/entityconnect.menu.inc',
  );

  $items['admin/entityconnect/add/%'] = array(
    'title' => "Choose type to create and add",
    'description' => 'Add item for entity referenced.',
    'page callback' => 'entityconnect_add',
    'page arguments' => array(3),
    'access callback' => 'user_access',
    'access arguments' => array('entityconnect add button'),
    'file' => 'includes/entityconnect.menu.inc',
  );

  $items['admin/config/content/entityconnect'] = array(
    'title' => 'Entity Connect',
    'description' => 'Configure default values for Entity Reference fields using Entity Connect',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('_entityconnect_admin_form'),
    'access arguments' => array('administer site configuration'),
    'file' => 'includes/entityconnect.admin.inc',
  );

  return $items;
}

/**
 * Access callback: Used in return menu.
 */
function entityconnect_check_access() {
  if (user_access('entityconnect add button') || user_access('entityconnect edit button')) {
    return TRUE;
  }
  else {
    return FALSE;
  }
}

/**
 * Implements hook_field_attach_form().
 */
function entityconnect_field_attach_form($entity_type, $entity, &$form, &$form_state, $langcode) {
  entityconnect_include_form();
  foreach (_entityconnect_get_ref_fields() as $field_name => $field) {
    if (isset($form[$field_name])) {
      _entityconnect_field_attach_form($entity_type, $entity, $form,
        $form_state, $field_name, $field, $langcode);
    }
  }
}

/**
 * Implements hook_theme().
 */
function entityconnect_theme() {
  $items = array();

  $items['entityconnect_taxonomy_term_add_list'] = array(
    'arguments' => array('items' => NULL),
    'file' => 'includes/entityconnect.pages.inc',
  );

  $items['entityconnect_entity_add_list'] = array(
    'arguments' => array('items' => NULL, 'cache id' => NULL),
    'file' => 'includes/entityconnect.pages.inc',
  );

  return $items;
}

/**
 * Include the form inc file.
 *
 * This can be used in #submit array before the sumbit functions which are
 * located in the inc file.
 */
function entityconnect_include_form() {
  module_load_include("inc", "entityconnect", "includes/entityconnect.form");
}

/**
 * Wraps cache set.
 *
 * We can set the expire easily if needed.
 */
function entityconnect_cache_set($cid, $data) {
  // Get cache_lifetime variable.
  $cache_lifetime = variable_get('entityconnect_cache_lifetime', CACHE_PERMANENT);

  if ($cache_lifetime !== CACHE_PERMANENT) {
    $cache_lifetime = REQUEST_TIME + $cache_lifetime;
  }

  return cache_set($cid, $data, ENTITYCONNECT_CACHE_TABLE, $cache_lifetime);
}

/**
 * Wraps cache get.
 */
function entityconnect_cache_get($cid) {
  return cache_get($cid, ENTITYCONNECT_CACHE_TABLE);
}

/**
 * Implements hook_flush_caches().
 */
function entityconnect_flush_caches() {
  return array('cache_entityconnect');
}

/**
 * Implements hook_form_alter().
 *
 * If we are adding a new entity we pass of to entityconnect_add_form_alter
 * if we are returning to the parent form we hand off to
 * entityconnect_return_form_alter.
 */
function entityconnect_form_alter(&$form, &$form_state, $form_id) {
  $child = isset($_REQUEST['child']);

  // We can get the cid two different ways
  // first we try the $_REQUEST param.  if we do not getting it from there we
  // try the arg(3) if we are on a add form.  Also if we are on an add form we
  // know that we are a child page.
  foreach(arg() as $key => $value) {
    if (stripos($value, 'entityconnect-form-', 0) === 0) {
      $cid = $value;
    }
  }

  if ((isset($_REQUEST['build_cache_id']) && ($cid = $_REQUEST['build_cache_id']))
      || ((isset($cid)) && $child = TRUE)) {
    $cache = entityconnect_cache_get($cid);
    entityconnect_include_form();
    if ($child) {
      $form_state['#entityconnect_child_form'] = $cache;
    }
    if (isset($_REQUEST['return']) && isset($cache->data) && $cache->data['form']['#form_id'] == $form_id) {
      unset($_REQUEST['build_cache_id']);
      entityconnect_return_form_alter($form, $form_state, $form_id, $cid, $cache);
    }
  }

  // If this form is a child form let's add alter for that purpose
  // Note that we are doing this here becuase when we retrun to a form it gets
  // rebuilt so this will get caught in the rebuilt.
  if (isset($form_state['#entityconnect_child_form']) && $form_state['#entityconnect_child_form']) {
    $cache = $form_state['#entityconnect_child_form'];
    module_load_include('inc', 'entityconnect', 'includes/entityconnect.form');
    entityconnect_child_form_alter($form, $form_state, $form_id, $cache->cid, $cache);
  }
}

/**
 * Implements hook_module_implements_alter().
 *
 * Ensure entityconnect gets called after workbench_moderation when altering the node form
 *
 * @param array $module_list
 * @param string $context
 */
function entityconnect_module_implements_alter(&$module_list, $context) {
  // Need to override both to get correct sort order.
  // @see: https://api.drupal.org/api/drupal/modules%21system%21system.api.php/function/hook_module_implements_alter/7
  if($context == 'form_node_form_alter' || $context == 'form_alter') {
    // Move entityconnect implementation to the end of the list to ensure it gets called last.
    $group = isset($module_list['entityconnect']) ? $module_list['entityconnect'] : FALSE;
    unset($module_list['entityconnect']);
    $module_list['entityconnect'] = $group;
  }
}