<?php
/**
 * @file
 * Contains functions used to install/uninstall tripal_core.
 */

/**
 * Implementation of hook_install().
 *
 * @ingroup tripal_core
 */
function tripal_core_install() {

  // make the data directory for this module
  $data_dir = tripal_get_files_dir();
  if (!file_prepare_directory($data_dir, FILE_CREATE_DIRECTORY)) {
    $message = "Cannot create directory $data_dir. This module may not " .
               "behave correctly without this directory.  Please  create " .
               "the directory manually or fix the problem and reinstall.";
    drupal_set_message(check_plain($message), 'error');
    tripal_report_error('tripal_core', TRIPAL_ERROR, $message, array());
  }

  // the foreign key specification doesn't really add one to the
  // Drupal schema, it is just used internally, but we want one
  db_query('
      ALTER TABLE {tripal_custom_tables}
      ADD CONSTRAINT tripal_custom_tables_fk1
      FOREIGN KEY (mview_id) REFERENCES {tripal_mviews} (mview_id)
      ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED
  ');
}
/**
 * Implementation of hook_schema().
 *
 * @ingroup tripal_core
 */
function tripal_core_schema() {

  // get the schemas defined by this install file
  $schema = tripal_core_get_schemas();

  // if this module is already installed and enabled, then we want to provide
  // the schemas for all of the custom tables.  This will allow Views to
  // see the schemas.  We check if the module is installed because during
  // installation we don't want to make these custom tables available as we don't
  // want them created in the Drupal database.  The custom tables go in the
  // Chado database.
  if (db_table_exists('tripal_custom_tables')) {
    $sql = 'SELECT * FROM {tripal_custom_tables}';
    $results = db_query($sql);
    foreach ($results as $custom) {
      $schema[$custom->table_name] = unserialize($custom->schema);
    }
  }

  return $schema;
}

/**
 * Implementation of hook_uninstall().
 *
 * @ingroup tripal_core
 */
function tripal_core_uninstall() {
  
  // drop the foreign key between tripal_custom_tables and tripal_mviews
  // so that Drupal can then drop the tables
  db_query('
      ALTER TABLE {tripal_custom_tables}
      DROP CONSTRAINT IF EXISTS tripal_custom_tables_fk1 CASCADE
    ');
}

/**
 * This function simply defines all tables needed for the module to work
 * correctly.  By putting the table definitions in a separate function we
 * can easily provide the entire list for hook_install or individual
 * tables for an update.
 *
 * @ingroup tripal_core
 */
function tripal_core_get_schemas() {
  $schema = array();

  // get all the various schema parts and join them together
  $temp = tripal_core_jobs_schema();
  foreach ($temp as $table => $arr) {
    $schema[$table] = $arr;
  }
  $temp = tripal_core_mviews_schema();
  foreach ($temp as $table => $arr) {
    $schema[$table] = $arr;
  }
  $temp = tripal_core_custom_tables_schema();
  foreach ($temp as $table => $arr) {
    $schema[$table] = $arr;
  }

  return $schema;
}

/**
 * Describes the Tripal Materialized View (tripal_mviews) table
 * This table keeps track of all materialized views created by Tripal and stored in chado
 *
 * @ingroup tripal_core
 */
function tripal_core_mviews_schema() {
  $schema = array();

  $schema['tripal_mviews'] = array(
    'fields' => array(
      'mview_id' => array(
        'type' => 'serial',
        'unsigned' => TRUE,
        'not NULL' => TRUE
      ),
      'name' => array(
        'type' => 'varchar',
        'length' => 255,
        'not NULL' => TRUE
      ),
      'modulename' => array(
        'type' => 'varchar',
        'length' => 50,
        'not NULL' => TRUE,
        'description' => 'The module name that provides the callback for this job'
      ),
      'mv_table' => array(
        'type' => 'varchar',
        'length' => 128,
        'not NULL' => FALSE
      ),
      'mv_specs' => array(
        'type' => 'text',
        'size' => 'normal',
        'not NULL' => FALSE
      ),
      'mv_schema' => array(
        'type' => 'text',
        'size' => 'normal',
        'not NULL' => FALSE
      ),
      'indexed' => array(
        'type' => 'text',
        'size' => 'normal',
        'not NULL' => FALSE
      ),
      'query' => array(
        'type' => 'text',
        'size' => 'normal',
        'not NULL' => TRUE
      ),
      'special_index' => array(
        'type' => 'text',
        'size' => 'normal',
        'not NULL' => FALSE
      ),
      'last_update' => array(
        'type' => 'int',
        'not NULL' => FALSE,
        'description' => 'UNIX integer time'
      ),
      'status'        => array(
        'type' => 'text',
        'size' => 'normal',
        'not NULL' => FALSE
      ),
      'comment' => array(
        'type' => 'text',
        'size' => 'normal',
        'not NULL' => FALSE
      ),
    ),
    'indexes' => array(
      'mview_id' => array('mview_id')
    ),
    'unique keys' => array(
      'mv_table' => array('mv_table'),
      'mv_name' => array('name'),
    ),
    'primary key' => array('mview_id'),
  );

  return $schema;
}

/**
 * Describes the Tripal Jobs (tripal_jobs) table
 * This table keeps track of all tripal jobs including their current status and is used
 * by tripal_launch_jobs to determine which jobs need to be run
 *
 * @ingroup tripal_core
 */
function tripal_core_jobs_schema() {
  $schema = array();
  $schema['tripal_jobs'] = array(
    'fields' => array(
      'job_id' => array(
        'type' => 'serial',
        'unsigned' => TRUE,
        'not NULL' => TRUE
      ),
      'uid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not NULL' => TRUE,
        'description' => 'The Drupal userid of the submitee'
      ),
      'job_name' => array(
        'type' => 'varchar',
        'length' => 255,
        'not NULL' => TRUE
      ),
      'modulename' => array(
        'type' => 'varchar',
        'length' => 50,
        'not NULL' => TRUE,
        'description' => 'The module name that provides the callback for this job'
      ),
      'callback' => array(
        'type' => 'varchar',
        'length' => 255,
        'not NULL' => TRUE
      ),
      'arguments' => array(
        'type' => 'text',
        'size' => 'normal',
        'not NULL' => FALSE
      ),
      'progress' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'default' => 0,
        'not NULL' => FALSE,
        'description' => 'a value from 0 to 100 indicating percent complete'
      ),
      'status' => array(
        'type' => 'varchar',
        'length' => 50,
        'not NULL' => TRUE
      ),
      'submit_date' => array(
        'type' => 'int',
        'not NULL' => TRUE,
        'description' => 'UNIX integer submit time'
      ),
      'start_time' => array(
        'type' => 'int',
        'not NULL' => FALSE,
        'description' => 'UNIX integer start time'
      ),
      'end_time' => array(
        'type' => 'int',
        'not NULL' => FALSE,
        'description' => 'UNIX integer end time'
      ),
      'error_msg' => array(
        'type' => 'text',
        'size' => 'normal',
        'not NULL' => FALSE
      ),
      'pid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not NULL' => FALSE,
        'description' => 'The process id for the job'
      ),
      'priority' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not NULL' => TRUE,
        'default' => '0',
        'description' => 'The job priority'
      ),
      'mlock' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not NULL' => FALSE,
        'description' => 'If set to 1 then all jobs for the module are held until this one finishes'
      ),
      'lock' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not NULL' => FALSE,
        'description' => 'If set to 1 then all jobs are held until this one finishes'
      ),
    ),
    'indexes' => array(
      'job_id' => array('job_id'),
      'job_name' => array('job_name')
    ),
    'primary key' => array('job_id'),
  );

  return $schema;
}

/**
 * Describes the Tripal Custom Tables (tripal_custom_tables) table
 * This keeps track of tables created by Tripal and stored in chado that may or may not
 * also be materialized views.
 *
 * @ingroup tripal_core
 */
function tripal_core_custom_tables_schema() {
  $schema = array();
  $schema['tripal_custom_tables'] = array(
    'fields' => array(
      'table_id' => array(
        'type' => 'serial',
        'unsigned' => TRUE,
        'not NULL' => TRUE
      ),
      'table_name' => array(
        'type' => 'varchar',
        'length' => 255,
        'not NULL' => TRUE
      ),
      'schema' => array(
        'type' => 'text',
        'not NULL' => TRUE
      ),
      'mview_id' => array(
        'type' => 'int',
        'not NULL' => FALSE
      )
    ),
    'indexes' => array(
      'table_id' => array('table_id'),
    ),
    'primary key' => array('table_id'),
    'foreign keys' => array(
      'tripal_mviews' => array(
        'table' => 'tripal_mviews',
        'columns' => array(
          'mview_id' => 'mview_id'
        ),
      ),
    ),
  );

  return $schema;
}

/**
 * Adds an mview_id column to the tripal_custom_tables table and makes an assocation between the mview and the custom table
 *
 */
function tripal_core_update_7200() {

  // add an mview column to the tripal_custom_tables table so we
  // can associate which of the custom tables are also mviews
  if (!db_field_exists('tripal_custom_tables', 'mview_id')) {
    $spec = array(
      'type' => 'int',
      'not NULL' => FALSE
    );
    $keys = array(
      'foreign keys' => array(
        'tripal_mviews' => array(
          'table' => 'tripal_mviews',
          'columns' => array(
            'mview_id' => 'mview_id'
          ),
        ),
      ),
    );
    db_add_field('tripal_custom_tables', 'mview_id', $spec, $keys);
    
    // the foreign key specification doesn't really add one to the
    // Drupal schema, it is just used internally, but we want one
    db_query('
      ALTER TABLE {tripal_custom_tables}
      ADD CONSTRAINT tripal_custom_tables_fk1
      FOREIGN KEY (mview_id) REFERENCES {tripal_mviews} (mview_id)
      ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED
    ');
  }
  
  // now link the materialized view to it's custom table entry
  $mviews = db_select('tripal_mviews', 'tmv')
    ->fields('tmv', array('mview_id', 'mv_table'))
    ->execute();
  foreach ($mviews as $mview) {
    db_update('tripal_custom_tables')
     ->fields(array(
       'mview_id' => $mview->mview_id
     ))
     ->condition('table_name', $mview->mv_table)
     ->execute();
     
     
  }
  
}