<?php

function oai_install() {
  oai_export_set_bundles();
}


//FIX ME : allow user to call this function with other $entity_type than "node"
function oai_export_set_bundles($entity_type='node') {
  $transaction = db_transaction();
  try {
    db_delete('oai')
      ->condition('entity_type', $entity_type)
      ->execute();

    
    $query=db_select('node', 'n'); 
        $query->addField('n','nid', 'entity_id');
        $query->addField('n','type', 'bundle');
        $query->addField('n','changed', 'changed');
    
    db_insert('oai')
      ->fields(array( 'entity_id', 'bundle', 'changed'))
      ->from($query)
      ->execute();
    
  }
  catch (Exception $e) {
    $transaction->rollback();
    // Re-throw the exception so we are aware of the failure.
    throw $e;
  }
}

function oai_uninstall() {
  variable_del('oai_configurations');
}

/**
* Implementation of hook_schema
*/
function oai_schema(){
    
    $schema['oai'] = array(
      'description' => 'Stores a record of when an entity changed to determine if it needs export for OAI store.',
      'fields' => array(
        'entity_type' => array(
          'description' => 'The type of entity.',
          'type' => 'varchar',
          'length' => 32,
          'not null' => TRUE,
          'default' => 'node',
        ),
        'entity_id' => array(
          'description' => 'The primary identifier for an entity.',
          'type' => 'int',
          'unsigned' => TRUE,
          'not null' => TRUE,
        ),
        'bundle' => array(
          'description' => 'The bundle to which this entity belongs.',
          'type' => 'varchar',
          'length' => 128,
          'not null' => TRUE,
        ),
        'status' => array(
          'description' => 'Boolean indicating whether the entity should be in the OAI store.',
          'type' => 'int',
          'not null' => TRUE,
          'default' => 0,
        ),
        'changed' => array(
          'description' => 'The Unix timestamp when an entity was changed.',
          'type' => 'int',
          'not null' => TRUE,
          'default' => 0,
        ),
        'dc_path' => array(
          'description' => 'path of xml file for "dc" profile',
          'type' => 'varchar',
          'length' => 255,
          'not null' => TRUE,
          'default' => '',
        ),
        'pse_path' => array(
          'description' => 'path of xml file for "pse" profile',
          'type' => 'varchar',
          'length' => 255,
          'not null' => TRUE,
          'default' => '',
        ),
      ),
      'indexes' => array(
        'bundle_changed' => array('bundle', 'changed'),
      ),
      'primary key' => array('entity_id'),
    );
    
    
	return $schema;
}