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<?php

/**
 * @file
 * Muamba installation functions.
 */

/**
 * Implements hook_install()
 */
function muamba_install() {
}

/**
 * Implements hook_schema()
 */
function muamba_schema() {
  $schema['muamba'] = array(
    'description' => 'The base table for muamba assets.',
    'fields'      => array(
      'mid'           => array(
        'description' => t('The primary identifier for a muamba transaction.'),
        'type'        => 'serial',
        'unsigned'    => TRUE,
        'not null'    => TRUE,
      ),
      'nid'            => array(
        'description' => t('The {node}.nid of the borrowed item.'),
        'type'        => 'int',
        'unsigned'    => TRUE,
        'not null'    => TRUE,
        'default'     => 0,
      ),
      'owner'         => array(
        'description' => t('The {user}.owner owner of an item.'),
        'type'        => 'int',
        'unsigned'    => TRUE,
        'not null'    => TRUE,
        'default'     => 0,
      ),
      'uid'           => array(
        'description' => t('The {user}.uid requesting an item.'),
        'type'        => 'int',
        'unsigned'    => TRUE,
        'not null'    => TRUE,
        'default'     => 0,
      ),
      'thread_id'     => array(
        'description' => t('The {thread}.thread_id for the transaction.'),
        'type'        => 'int',
        'unsigned'    => TRUE,
        'not null'    => TRUE,
        'default'     => 0,
      ),
      'status'        => array(
        'description' => t('Transaction status.'),
        'type'        => 'int',
        'unsigned'    => TRUE,
        'not null'    => TRUE,
        'default'     => 0,
      ),
      'active'        => array(
        'description' => t('Whether it is an active transaction.'),
        'type'        => 'int',
        'unsigned'    => TRUE,
        'not null'    => TRUE,
        'default'     => 1,
      ),
      'created'       => array(
        'description' => 'Timestamp of the transaction request',
        'type'        => 'int',
        'not null'    => TRUE,
        'unsigned'    => TRUE,
        'default'     => 0,
      ),      
      'changed'       => array(
        'description' => 'Timestamp of the latest update',
        'type'        => 'int',
        'not null'    => TRUE,
        'unsigned'    => TRUE,
        'default'     => 0,
      ),      
    ),
    'foreign keys' => array(
      'node' => array(
        'table'   => 'node',
        'columns' => array('nid' => 'nid'),
      ),
      'owner' => array(
        'table'   => 'users',
        'columns' => array('owner' => 'uid'),
      ),
      'requester' => array(
        'table'   => 'users',
        'columns' => array('uid' => 'uid'),
      ),
      'thread' => array(
        'table'   => 'pm_index',
        'columns' => array('thread_id' => 'thread_id'),
      ),
    ),
    'primary key' => array('mid'),
  );

  return $schema;
}

/**
 * Adds transactional fields to muamba data model.
 */
function muamba_update_7000(&$sandbox) {
  // Make sure to not run this update twice.
  if (db_field_exists('muamba', 'mid')) {
    return;
  }

  db_add_field('muamba', 'mid',
    array(
      'description' => t('The primary identifier for a muamba transaction.'),
      'type'        => 'int',
      'not null'    => TRUE,
    )
  );

  db_add_primary_key('muamba', array('mid'));

  db_add_field('muamba', 'status',
    array(
      'description' => t('Transaction status.'),
      'type'        => 'int',
      'unsigned'    => TRUE,
      'not null'    => TRUE,
      'default'     => 0,
    )
  );

  db_add_field('muamba', 'thread_id',
    array(
      'description' => t('The {thread}.thread_id for the transaction.'),
      'type'        => 'int',
      'unsigned'    => TRUE,
      'not null'    => TRUE,
      'default'     => 0,
    ),
    array(
      'foreign keys' => array(
        'thread' => array(
          'table'   => 'pm_index',
          'columns' => array('thread_id' => 'thread_id'),
        )
      )
    )
  );
}

/**
 * Adds autoincrement to mid field.
 */
function muamba_update_7001(&$sandbox) {
  db_change_field('muamba', 'mid', 'mid',
    array(
      'type'     => 'serial',
      'not null' => TRUE,
    )
  );
}

/**
 * Adds owner field.
 */
function muamba_update_7002(&$sandbox) {
  db_add_field('muamba', 'owner',
    array(
      'description' => t('The {user}.owner owner of an item.'),
      'type'        => 'int',
      'unsigned'    => TRUE,
      'not null'    => TRUE,
      'default'     => 0,
    )
  );
}

/**
 * Adds active field.
 */
function muamba_update_7003(&$sandbox) {
  db_add_field('muamba', 'active',
    array(
      'description' => t('Whether it is an active transaction.'),
      'type'        => 'int',
      'unsigned'    => TRUE,
      'not null'    => TRUE,
      'default'     => 1,
    )
  );
}

/**
 * Adds timestamp fields.
 */
function muamba_update_7004(&$sandbox) {
  db_add_field('muamba', 'created',
    array(
      'description' => 'Timestamp of the transaction request',
      'type'        => 'int',
      'not null'    => TRUE,
      'unsigned'    => TRUE,
      'default'     => 0,
    )
  );

  db_add_field('muamba', 'changed',
    array(
      'description' => 'Timestamp of the latest update',
      'type'        => 'int',
      'not null'    => TRUE,
      'unsigned'    => TRUE,
      'default'     => 0,
      )
  );
}