<?php

/**
 * @file
 * Logs menu CRUD commands in the event_log module.
 *
 * @author Bas van Meurs
 * @copyright Cipix Internet
 */

/**
 * Implements hook_event_log_handlers().
 * @return array
 */
function event_log_menu_event_log_handlers() {
  // Node event log handler.
  $handlers = array();
  $handlers['menu'] = array(
    'title' => t('Menu'),
    'form_ids' => array(
      'menu_edit_item',
      'menu_item_delete_form',
      'menu_overview_form'
    ),
    'form_submit_callback' => 'event_log_menu_form_submit',
    'relationships' => array(
      array(
        'table' => 'menu_custom',
        'field' => 'menu_name',
        'operations' => array('insert', 'update', 'delete'),
        'numeric' => FALSE,
      ),
      array(
        'table' => 'menu_links',
        'field' => 'mlid',
        'operations' => array('link insert', 'link update', 'link delete'),
        'numeric' => TRUE,
      ),
    ),
  );
  return $handlers;
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function event_log_form_menu_overview_form_alter(&$form, &$form_state) {
  // Save original tree structure.
  $menu_name = $form_state['build_info']['args'][0]['menu_name'];
  $data = menu_tree_all_data($menu_name);
  $form_state['original_tree'] = $data;
}

/**
 * Event log callback for the user authentication event log.
 * @param $form
 * @param $form_state
 * @param $form_id
 * @return array
 */
function event_log_menu_form_submit($form, $form_state, $form_id) {
  global $user;
  $log = NULL;
  switch ($form_id) {
    case 'menu_overview_form':
      $menu = $form_state['build_info']['args'][0];

      $info = array();
      $log = array(
        'operation' => 'overview',
        'description' => t('%title (%name)', array(
          '%title' => $menu['title'],
          '%name' => $menu['menu_name']
        )),
        'ref_char' => $menu['menu_name'],
        'info' => $form_state['original_tree'],
      );
      break;
    case 'menu_edit_item':
      if ($form_state['triggering_element']['#value'] == t('Save')) {
        $menu_link = $form_state['build_info']['args'][1];
        if (empty($menu_link)) {
          // Insert.
          $menu_link = menu_link_load($form_state['values']['mlid']);
          $log = array(
            'operation' => 'link insert',
            'description' => t('%title, %path (%mlid)', array(
              '%title' => $menu_link['link_title'],
              '%path' => $menu_link['link_path'],
              '%mlid' => $menu_link['mlid']
            )),
            'ref_numeric' => $menu_link['mlid'],
          );
        }
        else {
          // Update
          $log = array(
            'operation' => 'link update',
            'description' => t('%title, %path (%mlid)', array(
              '%title' => $menu_link['link_title'],
              '%path' => $menu_link['link_path'],
              '%mlid' => $menu_link['mlid']
            )),
            'ref_numeric' => $menu_link['mlid'],
            'info' => $menu_link,
          );
        }
      }
      break;
    case 'menu_item_delete_form':
      // Delete.
      $menu_link = $form_state['build_info']['args'][0];
      $log = array(
        'operation' => 'link delete',
        'description' => t('%title, %path (%mlid)', array(
          '%title' => $menu_link['link_title'],
          '%path' => $menu_link['link_path'],
          '%mlid' => $menu_link['mlid']
        )),
        'ref_numeric' => $menu_link['mlid'],
        'info' => $menu_link,
      );
      break;
  }
  return $log;
}

/**
 * Implements hook_menu_insert().
 */
function event_log_menu_menu_insert($menu) {
  $log = array(
    'type' => 'menu',
    'operation' => 'insert',
    'description' => t('%title (%name)', array(
      '%title' => $menu['title'],
      '%name' => $menu['menu_name']
    )),
    'ref_char' => $menu['menu_name'],
  );
  event_log_insert($log);
}

/**
 * Implements hook_menu_update().
 */
function event_log_menu_menu_update($menu) {
  $log = array(
    'type' => 'menu',
    'operation' => 'update',
    'description' => t('%title (%name)', array(
      '%title' => $menu['title'],
      '%name' => $menu['menu_name']
    )),
    'ref_char' => $menu['menu_name'],
  );
  event_log_insert($log);
}

/**
 * Implements hook_menu_delete().
 */
function event_log_menu_menu_delete($menu) {
  $log = array(
    'type' => 'menu',
    'operation' => 'delete',
    'description' => t('%title (%name)', array(
      '%title' => $menu['title'],
      '%name' => $menu['menu_name']
    )),
    'ref_char' => $menu['menu_name'],
    'info' => $menu,
  );
  event_log_insert($log);
}