<?php

/**
 * @file
 * Implementation of hook_install().
 */
function nodereference_install() {
  drupal_load('module', 'content');
  content_notify('install', 'nodereference');
}

/**
 * Implementation of hook_uninstall().
 */
function nodereference_uninstall() {
  drupal_load('module', 'content');
  content_notify('uninstall', 'nodereference');
}

/**
 * Implementation of hook_enable().
 *
 * Notify content module when this module is enabled.
 */
function nodereference_enable() {
  drupal_load('module', 'content');
  content_notify('enable', 'nodereference');
}

/**
 * Implementation of hook_disable().
 *
 * Notify content module when this module is disabled.
 */
function nodereference_disable() {
  drupal_load('module', 'content');
  content_notify('disable', 'nodereference');
}

function nodereference_update_last_removed() {
  return 3;
}

/**
 * All fields must allow NULL values to indicate empty fields.
 */
function nodereference_update_6000(&$sandbox) {
  include_once('./'. drupal_get_path('module', 'content') .'/content.install');
  drupal_load('module', 'content');

  $ret = array();

  if (!isset($sandbox['progress'])) {
    if ($abort = content_check_update('nodereference')) {
      return $abort;
    }

    // Get the latest cache values and schema.
    content_clear_type_cache(TRUE, TRUE);
    $types = content_types_install();

    if (empty($types)) {
      return $ret;
    }

    $sandbox['fields'] = array();
    foreach ($types as $type_name => $fields) {
      foreach ($fields as $field) {
        if ($field['type'] == 'nodereference') {
          $sandbox['fields'][] = $field;
        }
      }
    }

    if (empty($sandbox['fields'])) {
      return $ret;
    }

    $sandbox['progress'] = 0;
    $sandbox['visited'] = array();
  }

  $field = $sandbox['fields'][$sandbox['progress']];

  // We only want to process a field once -- if we hit it a second time,
  // that means it's its own table and it should have already been updated.
  if (!in_array($field['field_name'], $sandbox['visited'])) {
    $db_info = content_database_info($field);
    $table = $db_info['table'];
    $attributes = $db_info['columns']['nid'];
    $column = $attributes['column'];
    $attributes['not null'] = FALSE;
    db_change_field($ret, $table, $column, $column, array('type' => 'int', 'not null' => FALSE));
    db_field_set_no_default($ret, $db_info['table'], $column);
    $ret[] = update_sql("UPDATE {". $db_info['table'] ."} SET ". $column ." = NULL WHERE ". $column ." = 0");

    $sandbox['visited'][] = $field['field_name'];
  }

  $sandbox['progress']++;
  $ret['#finished'] = $sandbox['progress'] / count($sandbox['fields']);

  return $ret;
}

/**
 * Create an index by node reference column for all fields.
 */
function nodereference_update_6001(&$sandbox) {
  include_once('./'. drupal_get_path('module', 'content') .'/content.install');
  drupal_load('module', 'content');

  $ret = array();

  if (!isset($sandbox['progress'])) {
    if ($abort = content_check_update('nodereference')) {
      return $abort;
    }

    // Get the latest cache values and schema.
    content_clear_type_cache(TRUE, TRUE);
    $types = content_types_install();

    if (empty($types)) {
      return $ret;
    }

    $sandbox['fields'] = array();
    foreach ($types as $type_name => $fields) {
      foreach ($fields as $field) {
        if ($field['type'] == 'nodereference') {
          $sandbox['fields'][] = $field;
        }
      }
    }

    if (empty($sandbox['fields'])) {
      return $ret;
    }

    $sandbox['progress'] = 0;
    $sandbox['visited'] = array();
  }

  $field = $sandbox['fields'][$sandbox['progress']];

  // We only want to process a field once -- if we hit it a second time,
  // that means it's its own table and it should have already been updated.
  if (!in_array($field['field_name'], $sandbox['visited'])) {
    $db_info = content_database_info($field);
    $table = $db_info['table'];
    $attributes = $db_info['columns']['nid'];
    $column = $attributes['column'];
    if (!content_db_index_exists($table, $column)) {
      db_add_index($ret, $table, $column, array($column));
    }
    $sandbox['visited'][] = $field['field_name'];
  }

  $sandbox['progress']++;
  $ret['#finished'] = $sandbox['progress'] / count($sandbox['fields']);

  return $ret;
}
