<?php

/**
 * @file
 * Provides functionality to search the node content screen.
 */

/**
 * Implements hook_form_alter().
 */
function find_content_form_node_admin_content_alter(&$form, &$form_state, $form_id) {
  
  // Check to see if we are on the delete submit page, if we are, don't show the form
  if(!in_array('node_multiple_delete_confirm_submit', $form['#submit'])){
    $searched_for = '';
    $results_array = '';
    if (isset($_SESSION['node_overview_search'])) {
      $results_array = $_SESSION['node_overview_search'];
    }
    if (isset($_SESSION['node_overview_search_term'])) {
      $searched_for = $_SESSION['node_overview_search_term'];
    }
    $form['admin']['options']['#weight'] = 5;
    $form['admin']['search']['#weight'] = 10;
    $form['admin']['nodes']['#weight'] = 15;
    $form['admin']['pager']['#weight'] = 20;
    
    $form['admin']['search'] = array(
      '#type' => 'fieldset',
      '#title' => t('Search by title'),
      '#access' => TRUE,
    );
    $form['admin']['search']['search_term'] = array(
      '#type' => 'textfield',
      '#title' => t(''),
      '#size' => 60,
      '#default_value' => $searched_for,
    );
    $form['admin']['search']['submit'] = array(
      '#type' => 'submit',
      '#value' => t('Search'),
    );
    $form['admin']['search']['clear'] = array(
      '#type' => 'submit',
      '#value' => t('Clear'),
    );
    $form['#submit'][] = '_find_content_submit';
    if (!empty($results_array) && isset($form['admin']['nodes']['#options'])) {
      foreach ($form['admin']['nodes']['#options'] as $key => $value) {
        if (!in_array($key, $results_array)) {
          unset($form['admin']['nodes']['#options'][$key]);
        }
      }
    }
  }
}

/**
 * Submit function for search form.
 */
function _find_content_submit($form, &$form_state) {
  switch ($form_state['clicked_button']['#value']) {
    case 'Clear':
      unset($_SESSION['node_overview_search']);
      unset($_SESSION['node_overview_search_term']);
      $nodes_to_show = array();
      $_SESSION['node_overview_search'] = $nodes_to_show;
      break;

    default:
      unset($_SESSION['node_overview_search']);
      $search_term = $form['admin']['search']['search_term']['#value'];
      $_SESSION['node_overview_search_term'] = $search_term;
      break;
  }
}

/**
 * Implementation of hook_query_TAG_alter (node_access)
 */
function find_content_query_node_access_alter(QueryAlterableInterface $query) {
  if ($_GET['q'] == 'admin/content' && isset($_SESSION['node_overview_search_term'])) {
    $tables =& $query->getTables();
    if (isset($tables['n']['table']) && $tables['n']['table'] == 'node') {
      $query->condition('n.title', '%' . $_SESSION['node_overview_search_term'] . '%', 'LIKE');
    }
  }
}