<?php

/**
 * @file
 * Installation functions for Relation module.
 */

/**
 * Create our field.
 */
function relation_install() {
  module_list(TRUE);
  field_info_cache_clear();
  $field = array(
    'field_name' => 'endpoints',
    'cardinality' => FIELD_CARDINALITY_UNLIMITED,
    'type' => 'relation_endpoint',
  );
  field_create_field($field);
}

/**
 * Implements hook_schema().
 */
function relation_schema() {
  $schema['relation'] = array(
    'description' => 'Keeps track of relation entities.',
    'fields' => array(
      'rid' => array(
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'description' => 'Unique relation id (entity id).',
      ),
      'relation_type' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Relation type (see relation_type table).',
      ),
      'vid' => array(
        'description' => 'The current {relation_revision}.vid version identifier.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
      ),
      'uid' => array(
        'description' => 'The {users}.uid that owns this relation; initially, this is the user that created it.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'created' => array(
        'description' => 'The Unix timestamp when the relation was created.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'changed' => array(
        'description' => 'The Unix timestamp when the relation was most recently saved.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'arity' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The number rows in this relation. Cannot exceed max_arity, or be less than min_arity in relation_type table.',
      ),
    ),
    'primary key' => array('rid'),
    'indexes' => array(
      'relation_types' => array('relation_type', 'rid'),
    ),
  );
  $schema['relation_revision'] = array(
    'description' => 'Keeps track of relation entities.',
    'fields' => array(
      'rid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Unique relation id (entity id).',
      ),
      'relation_type' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Relation type (see relation_type table).',
      ),
      'vid' => array(
        'description' => 'The current {relation_revision}.vid version identifier.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'uid' => array(
        'description' => 'The {users}.uid that owns this relation; initially, this is the user that created it.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'changed' => array(
        'description' => 'The Unix timestamp when the relation was most recently saved.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'arity' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The number rows in this relation. Cannot exceed max_arity, or be less than min_arity in relation_type table.',
      ),
    ),
    'primary key' => array('vid'),
    'indexes' => array(
      'rid_vid' => array('rid', 'vid'),
    ),
  );
  $schema['relation_type'] = array(
    'description' => 'Relation settings.',
    // Add exportability using ctools.
    'export' => array(
      'key' => 'relation_type',
      'identifier' => 'relation_type',
      'default hook' => 'relation_default_relation_types',  // Function hook name.
      'api' => array(
        'owner' => 'relation',
        'api' => 'relation_type_default',  // Base name for api include files.
        'minimum_version' => 1,
        'current_version' => 1,
      ),
      // the callback to load the available bundles
      'subrecords callback' => '_relation_get_types_bundles',
      'export callback' => 'relation_relation_type_export',
    ),
    'fields' => array(
      'relation_type' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'The machine-readable name of this type.',
      ),
      'label' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'The human-readable name of this type.',
      ),
      'reverse_label' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'The reverse human-readable name of this type. Only used for directional relations.',
      ),
      'directional' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Whether this relation type is directional. If not, all indexes are ignored.',
      ),
      'transitive' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Whether this relation type is transitive.',
      ),
      'r_unique' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Whether relations of this type are unique.',
      ),
      'min_arity' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 2,
        'description' => 'The minimum number of rows that can make up a relation of this type.',
      ),
      'max_arity' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 2,
        'description' => 'The maximum number of rows that can make up a relation of this type. Similar to field cardinality.',
      ),
    ),
    'primary key' => array('relation_type'),
  );
  $schema['relation_bundles'] = array(
    'description' => 'Relation type available bundles',
    'fields' => array(
      'relation_type' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'The relation type.',
      ),
      'entity_type' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Entity type that is available to this relation.',
      ),
      'bundle' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Entity bundle that is available to this relation.',
      ),
      'r_index' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Direction index for relations: 0=from, 1=to. The index is ignored if the directional column in the relation_type table is 0.',
      ),
    ),
  );
  return $schema;
}

/**
 * Implements hook_uninstall().
 */
function relation_uninstall() {
  // Remove fields attached to relation type bundles.
  $types = db_query("SELECT relation_type FROM {relation_type}")->fetchCol();
  foreach ($types as $type) {
    field_attach_delete_bundle('relation', $type);
  }
  field_delete_field('endpoints');
}

/**
 * Implements hook_update_N().
 */
function hook_update_7001() {
  module_enable(array('relation_endpoints'));
}