<?php
// $Id$

/**
 * gallery.module : gallery.install
 * Install/Uninstall functions
 */

/**
 * Implementation of hook_install().
 */
function gallery_install() {
}

/**
 * Implementation of hook_update_N().
 * Migrate settings from the 5.x-1.x to 5.x-2.x series
 */
function gallery_update_1() {
  // Array containing 'old name' => 'new name' map
  $migrate = array(
    // Image block settings
    'gallery_album_frame'               => 'gallery_block_image_0_album_frame',
    'gallery_block_block'               => 'gallery_block_image_0_block_block',
    'gallery_block_show'                => 'gallery_block_image_0_block_show',
    'gallery_item_frame'                => 'gallery_block_image_0_item_frame',
    'gallery_item_id'                   => 'gallery_block_image_0_item_id',
    'gallery_link_target'               => 'gallery_block_image_0_link_target',
    'gallery_block_num_images'          => 'gallery_block_image_0_num_images',
    'gallery_maxsize'                   => 'gallery_block_image_0_size',
    // Grid block settings
    'gallery_grid_album_frame'          => 'gallery_block_grid_0_album_frame',
    'gallery_grid_block_block'          => 'gallery_block_grid_0_block_block',
    'gallery_grid_block_show'           => 'gallery_block_grid_0_block_show',
    'gallery_grid_item_frame'           => 'gallery_block_grid_0_item_frame',
    'gallery_grid_item_id'              => 'gallery_block_grid_0_item_id',
    'gallery_grid_link_target'          => 'gallery_block_grid_0_link_target',
    'gallery_grid_maxsize'              => 'gallery_block_grid_0_size',
    'gallery_grid_num_cols'             => 'gallery_block_grid_0_num_cols',
    'gallery_grid_num_rows'             => 'gallery_block_grid_0_num_rows',
    // G2 filter settings
    'gallery_filter_default_size'       => 'gallery_filter_default_maxsize',
    // Search settings
    'gallery_search_max_rows_per_pager' => 'gallery_search_rows_per_pager',
    'gallery_search_maxsize'            => 'gallery_search_size',
    // Fullname support
    'gallery_use_full_name'             => 'gallery_use_fullname',
    'gallery_profile_full_name_field'   => 'gallery_profile_fullname_field'
  );
  // Array containing obsolete variables
  $obsolete = array('gallery_search_max_items', 'gallery_autodetect_dir', 'gallery_uri', 'gallery_dir');

  // Update variables
  $ret = gallery_update_variables($migrate, $obsolete);
  
  // Update the blocks
  $ret[] = update_sql("UPDATE {blocks} SET delta = 'image-0' WHERE module = 'gallery' AND delta = 0");
  $ret[] = update_sql("UPDATE {blocks} SET delta = 'navigation' WHERE module = 'gallery' AND delta = 1");
  $ret[] = update_sql("UPDATE {blocks} SET delta = 'grid-0' WHERE module = 'gallery' AND delta = 2");
  
  // Mark gallery configuration invalid. This does NOT reset the configuration, but
  // forces the user to run the install wizard to (re)set and verify critical settings.
  variable_set('gallery_valid', FALSE);
  variable_set('gallery_config_reset', TRUE);
  drupal_set_message('You were updating from gallery module 5.x-1.x (or earlier) to the 5.x-2.x
                      series of the module. All your settings were migrated automatically (see below),
                      but you will need to re-configure some basic options. Please visit the
                      Gallery settings page (admin/settings/gallery) to complete the update.',
                      'error');
  
  cache_clear_all('variables', 'cache');
  menu_rebuild();
  
  return $ret;
}

/**
 * Function gallery_update_variables().
 */
function gallery_update_variables($migrate, $obsolete) {
  $ret = array();

  $variables = array();
  // Fetch all gallery-related variables
  $result = db_query("SELECT * FROM {variable} WHERE name LIKE 'gallery_%'");
  while ($var = db_fetch_object($result)) {
    $variables[$var->name] = $var->value;
  }

  // Remove old variables
  db_query("DELETE FROM {variable} WHERE name LIKE 'gallery_%'");

  // Migrate old variables
  foreach ($migrate as $old => $new) {
    if (isset($variables[$old])) {
      $variables[$new] = $variables[$old];
      unset($variables[$old]);
      $ret[] = array('success' => TRUE, 'query' => 'Migrating variable ['. $old .' => '. $new .']');
    }
  }

  // Unset obsolete variables
  foreach ($obsolete as $var) {
    if (isset($variables[$var])) {
      unset($variables[$var]);
      $ret[] = array('success' => TRUE, 'query' => 'Removing variable ['. $var .']');
    }
  }

  // Save resulting variables array
  // (all variables not migrated or unset are taken over directly)
  foreach ($variables as $name => $value) {
    // We dont use variable_set() to reduce overhead
    // (i.e. unserialize => serialize and cache_clear_all() for each variable)
    db_query("INSERT INTO {variable} (name, value) VALUES ('%s', '%s')", $name, $value);
  }

  return $ret;
}

/**
 * Implementation of hook_uninstall().
 */
function gallery_uninstall() {
  // Remove all gallery related variables and blocks
  db_query("DELETE FROM {variable} WHERE name LIKE 'gallery_%'");
  db_query("DELETE FROM {blocks} WHERE module = 'gallery'");
  cache_clear_all('variables', 'cache');
}