<?php

/**
 * @file
 * Install file for the link module.
 */

/**
 * Upgrade notes:
 * Things we need to make sure work when upgrading from Drupal 6 to Drupal 7:
 */

/**
 * Implements hook_field_schema().
 */
function link_field_schema($field) {
  return array(
    'columns' => array(
      'url' => array(
        'type' => 'varchar',
        'length' => 2048, // Maximum URLs length.
        'not null' => FALSE,
        'sortable' => TRUE
      ),
      'title' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => FALSE,
        'sortable' => TRUE
      ),
      'attributes' => array(
        'type' => 'text',
        'size' => 'medium',
        'not null' => FALSE
      ),
    ),
  );
}

/**
 * Implements hook_update_last_removed().
 */
function link_update_last_removed() {
  return 6001;
}

/**
 * Handles moving settings data from field_config.data to field_config_instance.data.
 */
function link_update_7000() {
  
  // For each field that is a link field, we need to copy the settings from the general field level down to the instance.
  //$field_data = array();
  $result = db_query("SELECT id, field_name, data FROM {field_config} WHERE module = 'link' AND type = 'link_field'");
  foreach ($result as $field) {
    $field_id = $field->id;
    $name = $field->field_name;
    $field_data = unserialize($field->data);
    
    $instances = db_query("SELECT id, data FROM {field_config_instance} WHERE field_id = :field_id", array(':field_id' => $field_id));
    foreach ($instances as $instance) {
      // If this field has been updated already, we want to skip it.
      $instance_data = unserialize($instance->data);
      $update_instance = FALSE;
      if (!isset($instance_data['settings']['title'])) {
        foreach ($field_data['settings'] as $key => $value) {
          if (!isset($instance_data['settings'][$key])) {
            $instance_data['settings'][$key] = $value;
            $update_instance = TRUE;
          }
        }
        if ($update_instance) {
          // update the database.
          $num_updated = db_update('field_config_instance')
            ->fields(array('data' => serialize($instance_data)))
            ->condition('id', $instance->id)
            ->execute();
        }
      }
    }
  }
  
  return t("Instance settings have been set with the data from the field settings.");
}

/**
 * Renames all displays from foobar to link_foobar
 */
function link_update_7001() {
  // for each field that is a link field, we need to update the display types:
  
  $result = db_query("SELECT id, field_name, data FROM {field_config} WHERE module = 'link' AND type = 'link_field'");
  foreach ($result as $field) {
    $field_id = $field->id;
    $name = $field->field_name;
    $field_data = unserialize($field->data);
    
    $instances = db_query("SELECT id, data FROM {field_config_instance} WHERE field_id = :field_id", array(':field_id' => $field_id));
    foreach ($instances as $instance) {
      // If this field has been updated already, we want to skip it.
      $instance_data = unserialize($instance->data);
      $update_instance = FALSE;
      foreach ($instance_data['display'] as $display_name => $display_data) {
        if ($display_data['type'] && (0 !== strpos($display_data['type'], 'link_'))) {
          $instance_data['display'][$display_name]['type'] = 'link_'. $display_data['type'];
          $update_instance = TRUE;
        }
      }
      if ($update_instance) {
        // update the database.
        $num_updated = db_update('field_config_instance')
          ->fields(array('data' => serialize($instance_data)))
          ->condition('id', $instance->id)
          ->execute();
      }
    }
  }
}