<?php
// $Id: upgrade_assist.install,v 1.3 2010/10/11 02:58:55 sun Exp $

/**
 * @file
 * Installation functions for Upgrade Assist.
 */

/**
 * Implements hook_install().
 */
function upgrade_assist_install() {
  // Ensure that potential constants are defined.
  drupal_load('module', 'system');

  // Figure out current major versions.
  $core = (defined('DRUPAL_CORE_COMPATIBILITY') ? DRUPAL_CORE_COMPATIBILITY : VERSION);
  preg_match('@^(\d+)@', $core, $matches);
  $core = (int) $matches[0];

  switch ($core) {
    case 6:
      $core_current = db_result(db_query("SELECT schema_version FROM {system} WHERE type = 'module' AND name = 'system'"));
      break;

    case 7:
      $core_current = db_query("SELECT schema_version FROM {system} WHERE type = 'module' AND name = 'system'")->fetchField();
      break;
  }
  $core_current = (int) $core_current[0];

  variable_set('upgrade_assist_core', $core);
  variable_set('upgrade_assist_core_current', $core_current);
}

/**
 * Implements hook_enable().
 */
function upgrade_assist_enable() {
  // Try to auto-enable the upgrade tasks block. Requires a 'left' region.
  _block_rehash();
}

/**
 * Implements hook_uninstall().
 */
function upgrade_assist_uninstall() {
  variable_del('upgrade_assist_core');
  variable_del('upgrade_assist_core_current');
}

if (DRUPAL_CORE_COMPATIBILITY == '7.x') {
  /**
   * Update the stored version of Drupal core.
   */
  function upgrade_assist_update_7000() {
    preg_match('@^(\d+)@', DRUPAL_CORE_COMPATIBILITY, $matches);
    $core = (int) $matches[0];
    variable_set('upgrade_assist_core', $core);
  }
}