<?php
/**
 * @file
 * Install, update and uninstall functions for the cdm_api module.
 */

/**
 * Implements hook_schema().
 * The drupal_(un)install_schema functions are called automatically in D7.
 */
function cdm_api_schema() {
  $schema['cache_cdm_ws'] = array(
    'fields' => array(
      'cid' => array(
        'description' => 'Primary Key: Unique cache ID.',
        'type' => 'varchar',
        'length' => '333',
        'not null' => TRUE,
        'default' => '',
      ),
      'data' => array(
        'description' => 'The data to cache.',
        'type' => 'blob',
        'size' => 'big',
        'not null' => FALSE,
      ),
      'expire' => array(
        'description' => 'A Unix timestamp indicating when the cache entry should expire, or 0 for never.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'disp-width' => '11',
      ),
      'created' => array(
        'description' => 'Unix timestamp indicating when the cache entry was created.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'disp-width' => '11',
      ),
      'serialized' => array(
        'description' => 'A flag to indicate whether content is serialized by Drupal (1) or not (0).',
        'type' => 'int',
        'size' => 'small',
        'not null' => FALSE,
      ),
    ),
    'primary key' => array('cid'),
    'indexes' => array(
      'expire' => array('expire'),
    ),
    // Important, since the 'cid' field is too big to create a key on in INNODB.
    // InnoDB allows a max. key length of 767 bytes, MyISAM 1000 bytes, which is
    // for utf8 (333*3)+1, so 333 characters max. instead of 255 chars.
    'mysql_engine' => 'MyISAM',
  );

  // @Comment WA: please describe the fields.
  $schema['node_cdm'] = array(
    'fields' => array(
      'nid' => array(
        'type' => 'int',
        'not null' => TRUE,
        'disp-width' => '11',
      ),
      'wsuri' => array(
        'type' => 'varchar',
        'length' => '255',
        'not null' => FALSE,
      ),
      'hash' => array(
        'type' => 'char',
        'length' => '32',
        'not null' => TRUE,
      ),
      'cdmtype' => array(
        'type' => 'varchar',
        'length' => '255',
        'not null' => FALSE,
      ),
      'uuid' => array(
        'type' => 'varchar',
        'length' => '255',
        'not null' => TRUE,
        'default' => '',
      ),
    ),
    'primary key' => array('hash'),
  );

  return $schema;
}

/**
 * Update D5 cache table to match Drupal 7 cache table columns.
 */
function cdm_api_update_7000() {
  $schema = cdm_api_schema();

  // No need to use db_change_field() here.
  // We simply drop and recreate the cache tables to start clean.
  db_drop_table('cache_cdm_ws');
  db_create_table('cache_cdm_ws', $schema['cache_cdm_ws']);
}


/**
 * Implements hook_requirements().
 *
 * This hook, like all others dealing with installation and updates, must
 * reside in the .install file, or it will not properly abort the installation
 * of the module if a critical requirement is missing.
 */
function cdm_api_requirements() {
  $requirements['cdm_api'] = array(
    'title' => 'CDM API'
  );

  return $requirements;
}