<?php

/**

 * @file

 * Install, update and uninstall functions for the poll module.

 */

/**

 * Implements hook_schema().

 */

function poll_schema() {

  $schema['poll'] = array(

    'description' => 'Stores poll-specific information for poll nodes.',

    'fields' => array(

      'nid' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'default' => 0,

        'description' => "The poll's {node}.nid.",

      ),

      'runtime' => array(

        'type' => 'int',

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The number of seconds past {node}.created during which the poll is open.',

      ),

      'active' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'default' => 0,

        'description' => 'Boolean indicating whether or not the poll is open.',

      ),

    ),

    'primary key' => array('nid'),

    'foreign keys' => array(

      'poll_node' => array(

        'table' => 'node',

        'columns' => array('nid' => 'nid'),

      ),

    ),

  );

  $schema['poll_choice'] = array(

    'description' => 'Stores information about all choices for all {poll}s.',

    'fields' => array(

      'chid' => array(

        'type' => 'serial',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'description' => 'Unique identifier for a poll choice.',

      ),

      'nid' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The {node}.nid this choice belongs to.',

      ),

      'chtext' => array(

        'type' => 'varchar',

        'length' => 128,

        'not null' => TRUE,

        'default' => '',

        'description' => 'The text for this choice.',

        'translatable' => TRUE,

      ),

      'chvotes' => array(

        'type' => 'int',

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The total number of votes this choice has received by all users.',

      ),

      'weight' => array(

        'type' => 'int',

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The sort order of this choice among all choices for the same node.',

      ),

    ),

    'indexes' => array(

      'nid' => array('nid'),

    ),

    'primary key' => array('chid'),

    'foreign keys' => array(

      'choice_node' => array(

        'table' => 'node',

        'columns' => array('nid' => 'nid'),

      ),

    ),

  );

  $schema['poll_vote'] = array(

    'description' => 'Stores per-{users} votes for each {poll}.',

    'fields' => array(

      'chid' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'description' => "The {users}'s vote for this poll.",

      ),

      'nid' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'description' => 'The {poll} node this vote is for.',

      ),

      'uid' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The {users}.uid this vote is from unless the voter was anonymous.',

      ),

      'hostname' => array(

        'type' => 'varchar',

        'length' => 128,

        'not null' => TRUE,

        'default' => '',

        'description' => 'The IP address this vote is from unless the voter was logged in.',

      ),

      'timestamp' => array(

        'type' => 'int',

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The timestamp of the vote creation.',

      ),

    ),

    'primary key' => array('nid', 'uid', 'hostname'),

    'foreign keys' => array(

      'poll_node' => array(

        'table' => 'node',

        'columns' => array('nid' => 'nid'),

      ),

      'voter' => array(

        'table' => 'users',

        'columns' => array('uid' => 'uid'),

      ),

    ),

    'indexes' => array(

      'chid'     => array('chid'),

      'hostname' => array('hostname'),

      'uid' => array('uid'),

    ),

  );

  return $schema;

}

/**

 * Use the poll_choice primary key to record votes in poll_votes rather than

 * the choice order. Rename chorder to weight.

 *

 * Rename {poll_choices} table to {poll_choice} and {poll_votes} to {poll_vote}.

 */

function poll_update_7001() {

  // Add chid column and convert existing votes.

  db_add_field('poll_votes', 'chid', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0));

  db_add_index('poll_votes', 'chid', array('chid'));

  db_update('poll_votes')

    ->expression('chid', Database::getConnection()->prefixTables('COALESCE((SELECT chid FROM {poll_choices} c WHERE {poll_votes}.chorder = c.chorder AND {poll_votes}.nid = c.nid), 0)'))

    ->execute();

  // Delete invalid votes.

  db_delete('poll_votes')->condition('chid', 0)->execute();

  // Remove old chorder column.

  db_drop_field('poll_votes', 'chorder');

  // Change the chorder column to weight in poll_choices.

  db_change_field('poll_choices', 'chorder', 'weight', array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'size' => 'tiny'));

  db_rename_table('poll_votes', 'poll_vote');

  db_rename_table('poll_choices', 'poll_choice');

}

/**

 * Add timestamp field to {poll_vote}.

 */

function poll_update_7002() {

  $field = array(

    'type' => 'int',

    'not null' => TRUE,

    'default' => 0,

  );

  db_add_field('poll_vote', 'timestamp', $field);

}

/**

 * Change the weight column to normal int.

 */

function poll_update_7003() {

  db_change_field('poll_choice', 'weight', 'weight', array(

    'type' => 'int',

    'not null' => TRUE,

    'default' => 0,

    'description' => 'The sort order of this choice among all choices for the same node.',

  ));

}

/**

 * @addtogroup updates-7.x-extra

 * @{

 */

/**

 * Update the database to match the schema.

 */

function poll_update_7004() {

  // Remove field default.

  db_change_field('poll_vote', 'chid', 'chid', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE));

}

/**

 * @} End of "addtogroup updates-7.x-extra".

 */